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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">A common molecular signature of patients with sickle cell disease revealed by microarray meta-analysis and a genome-wide association study</title><author><name sortKey="Ben Hamda, Cherif" sort="Ben Hamda, Cherif" uniqKey="Ben Hamda C" first="Cherif" last="Ben Hamda">Cherif Ben Hamda</name><affiliation><nlm:aff id="aff001"><addr-line>Laboratory of Bioinformatics, Biomathematics and Biostatistics, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff002"><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff003"><addr-line>Faculty of Science of Bizerte, Jarzouna, University of Carthage, Tunisia</addr-line></nlm:aff></affiliation></author><author><name sortKey="Sangeda, Raphael" sort="Sangeda, Raphael" uniqKey="Sangeda R" first="Raphael" last="Sangeda">Raphael Sangeda</name><affiliation><nlm:aff id="aff004"><addr-line>Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania</addr-line></nlm:aff></affiliation></author><author><name sortKey="Mwita, Liberata" sort="Mwita, Liberata" uniqKey="Mwita L" first="Liberata" last="Mwita">Liberata Mwita</name><affiliation><nlm:aff id="aff004"><addr-line>Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania</addr-line></nlm:aff></affiliation></author><author><name sortKey="Meintjes, Ayton" sort="Meintjes, Ayton" uniqKey="Meintjes A" first="Ayton" last="Meintjes">Ayton Meintjes</name><affiliation><nlm:aff id="aff005"><addr-line>University of Cape Town, Cape Town, South Africa</addr-line></nlm:aff></affiliation></author><author><name sortKey="Nkya, Siana" sort="Nkya, Siana" uniqKey="Nkya S" first="Siana" last="Nkya">Siana Nkya</name><affiliation><nlm:aff id="aff004"><addr-line>Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania</addr-line></nlm:aff></affiliation></author><author><name sortKey="Panji, Sumir" sort="Panji, Sumir" uniqKey="Panji S" first="Sumir" last="Panji">Sumir Panji</name><affiliation><nlm:aff id="aff005"><addr-line>University of Cape Town, Cape Town, South Africa</addr-line></nlm:aff></affiliation></author><author><name sortKey="Mulder, Nicola" sort="Mulder, Nicola" uniqKey="Mulder N" first="Nicola" last="Mulder">Nicola Mulder</name><affiliation><nlm:aff id="aff005"><addr-line>University of Cape Town, Cape Town, South Africa</addr-line></nlm:aff></affiliation></author><author><name sortKey="Guizani Tabbane, Lamia" sort="Guizani Tabbane, Lamia" uniqKey="Guizani Tabbane L" first="Lamia" last="Guizani-Tabbane">Lamia Guizani-Tabbane</name><affiliation><nlm:aff id="aff002"><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff006"><addr-line>Laboratory of Medical Parasitology, Biotechnology and Biomolecules, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></nlm:aff></affiliation></author><author><name sortKey="Benkahla, Alia" sort="Benkahla, Alia" uniqKey="Benkahla A" first="Alia" last="Benkahla">Alia Benkahla</name><affiliation><nlm:aff id="aff001"><addr-line>Laboratory of Bioinformatics, Biomathematics and Biostatistics, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff002"><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></nlm:aff></affiliation></author><author><name sortKey="Makani, Julie" sort="Makani, Julie" uniqKey="Makani J" first="Julie" last="Makani">Julie Makani</name><affiliation><nlm:aff id="aff003"><addr-line>Faculty of Science of Bizerte, Jarzouna, University of Carthage, Tunisia</addr-line></nlm:aff></affiliation></author><author><name sortKey="Ghedira, Kais" sort="Ghedira, Kais" uniqKey="Ghedira K" first="Kais" last="Ghedira">Kais Ghedira</name><affiliation><nlm:aff id="aff001"><addr-line>Laboratory of Bioinformatics, Biomathematics and Biostatistics, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff002"><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">29979707</idno><idno type="pmc">6034806</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6034806</idno><idno type="RBID">PMC:6034806</idno><idno type="doi">10.1371/journal.pone.0199461</idno><date when="2018">2018</date><idno type="wicri:Area/Pmc/Corpus">000252</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000252</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">A common molecular signature of patients with sickle cell disease revealed by microarray meta-analysis and a genome-wide association study</title><author><name sortKey="Ben Hamda, Cherif" sort="Ben Hamda, Cherif" uniqKey="Ben Hamda C" first="Cherif" last="Ben Hamda">Cherif Ben Hamda</name><affiliation><nlm:aff id="aff001"><addr-line>Laboratory of Bioinformatics, Biomathematics and Biostatistics, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff002"><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff003"><addr-line>Faculty of Science of Bizerte, Jarzouna, University of Carthage, Tunisia</addr-line></nlm:aff></affiliation></author><author><name sortKey="Sangeda, Raphael" sort="Sangeda, Raphael" uniqKey="Sangeda R" first="Raphael" last="Sangeda">Raphael Sangeda</name><affiliation><nlm:aff id="aff004"><addr-line>Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania</addr-line></nlm:aff></affiliation></author><author><name sortKey="Mwita, Liberata" sort="Mwita, Liberata" uniqKey="Mwita L" first="Liberata" last="Mwita">Liberata Mwita</name><affiliation><nlm:aff id="aff004"><addr-line>Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania</addr-line></nlm:aff></affiliation></author><author><name sortKey="Meintjes, Ayton" sort="Meintjes, Ayton" uniqKey="Meintjes A" first="Ayton" last="Meintjes">Ayton Meintjes</name><affiliation><nlm:aff id="aff005"><addr-line>University of Cape Town, Cape Town, South Africa</addr-line></nlm:aff></affiliation></author><author><name sortKey="Nkya, Siana" sort="Nkya, Siana" uniqKey="Nkya S" first="Siana" last="Nkya">Siana Nkya</name><affiliation><nlm:aff id="aff004"><addr-line>Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania</addr-line></nlm:aff></affiliation></author><author><name sortKey="Panji, Sumir" sort="Panji, Sumir" uniqKey="Panji S" first="Sumir" last="Panji">Sumir Panji</name><affiliation><nlm:aff id="aff005"><addr-line>University of Cape Town, Cape Town, South Africa</addr-line></nlm:aff></affiliation></author><author><name sortKey="Mulder, Nicola" sort="Mulder, Nicola" uniqKey="Mulder N" first="Nicola" last="Mulder">Nicola Mulder</name><affiliation><nlm:aff id="aff005"><addr-line>University of Cape Town, Cape Town, South Africa</addr-line></nlm:aff></affiliation></author><author><name sortKey="Guizani Tabbane, Lamia" sort="Guizani Tabbane, Lamia" uniqKey="Guizani Tabbane L" first="Lamia" last="Guizani-Tabbane">Lamia Guizani-Tabbane</name><affiliation><nlm:aff id="aff002"><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff006"><addr-line>Laboratory of Medical Parasitology, Biotechnology and Biomolecules, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></nlm:aff></affiliation></author><author><name sortKey="Benkahla, Alia" sort="Benkahla, Alia" uniqKey="Benkahla A" first="Alia" last="Benkahla">Alia Benkahla</name><affiliation><nlm:aff id="aff001"><addr-line>Laboratory of Bioinformatics, Biomathematics and Biostatistics, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff002"><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></nlm:aff></affiliation></author><author><name sortKey="Makani, Julie" sort="Makani, Julie" uniqKey="Makani J" first="Julie" last="Makani">Julie Makani</name><affiliation><nlm:aff id="aff003"><addr-line>Faculty of Science of Bizerte, Jarzouna, University of Carthage, Tunisia</addr-line></nlm:aff></affiliation></author><author><name sortKey="Ghedira, Kais" sort="Ghedira, Kais" uniqKey="Ghedira K" first="Kais" last="Ghedira">Kais Ghedira</name><affiliation><nlm:aff id="aff001"><addr-line>Laboratory of Bioinformatics, Biomathematics and Biostatistics, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></nlm:aff></affiliation><affiliation><nlm:aff id="aff002"><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></nlm:aff></affiliation></author></analytic><series><title level="j">PLoS ONE</title><idno type="eISSN">1932-6203</idno><imprint><date when="2018">2018</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>A chronic inflammatory state to a large extent explains sickle cell disease (SCD) pathophysiology. Nonetheless, the principal dysregulated factors affecting this major pathway and their mechanisms of action still have to be fully identified and elucidated. Integrating gene expression and genome-wide association study (GWAS) data analysis represents a novel approach to refining the identification of key mediators and functions in complex diseases. Here, we performed gene expression meta-analysis of five independent publicly available microarray datasets related to homozygous SS patients with SCD to identify a consensus SCD transcriptomic profile. The meta-analysis conducted using the MetaDE R package based on combining p values (maxP approach) identified 335 differentially expressed genes (DEGs; 224 upregulated and 111 downregulated). Functional gene set enrichment revealed the importance of several metabolic pathways, of innate immune responses, erythrocyte development, and hemostasis pathways. Advanced analyses of GWAS data generated within the framework of this study by means of the atSNP R package and SIFT tool identified 60 regulatory single-nucleotide polymorphisms (rSNPs) occurring in the promoter of 20 DEGs and a deleterious SNP, affecting CAMKK2 protein function. This novel database of candidate genes, transcription factors, and rSNPs associated with SCD provides new markers that may help to identify new therapeutic targets.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Piel, Fb" uniqKey="Piel F">FB Piel</name></author><author><name sortKey="Patil, Ap" uniqKey="Patil A">AP Patil</name></author><author><name sortKey="Howes, Re" uniqKey="Howes R">RE Howes</name></author><author><name sortKey="Nyangiri, Oa" uniqKey="Nyangiri O">OA Nyangiri</name></author><author><name sortKey="Gething, Pw" uniqKey="Gething P">PW Gething</name></author><author><name sortKey="Dewi, M" uniqKey="Dewi M">M Dewi</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Baralle, F" uniqKey="Baralle F">F Baralle</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Browning, Ja" uniqKey="Browning J">JA 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<front><journal-meta><journal-id journal-id-type="nlm-ta">PLoS One</journal-id><journal-id journal-id-type="iso-abbrev">PLoS ONE</journal-id><journal-id journal-id-type="publisher-id">plos</journal-id><journal-id journal-id-type="pmc">plosone</journal-id><journal-title-group><journal-title>PLoS ONE</journal-title></journal-title-group><issn pub-type="epub">1932-6203</issn><publisher><publisher-name>Public Library of Science</publisher-name><publisher-loc>San Francisco, CA USA</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">29979707</article-id><article-id pub-id-type="pmc">6034806</article-id><article-id pub-id-type="doi">10.1371/journal.pone.0199461</article-id><article-id pub-id-type="publisher-id">PONE-D-17-40761</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Research and Analysis Methods</subject><subj-group><subject>Mathematical and Statistical Techniques</subject><subj-group><subject>Statistical Methods</subject><subj-group><subject>Meta-Analysis</subject></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Physical Sciences</subject><subj-group><subject>Mathematics</subject><subj-group><subject>Statistics (Mathematics)</subject><subj-group><subject>Statistical Methods</subject><subj-group><subject>Meta-Analysis</subject></subj-group></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Genetics</subject><subj-group><subject>Gene Expression</subject></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Research and Analysis Methods</subject><subj-group><subject>Bioassays and Physiological Analysis</subject><subj-group><subject>Microarrays</subject></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Computational Biology</subject><subj-group><subject>Genome Analysis</subject><subj-group><subject>Genome-Wide Association Studies</subject></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Genetics</subject><subj-group><subject>Genomics</subject><subj-group><subject>Genome Analysis</subject><subj-group><subject>Genome-Wide Association Studies</subject></subj-group></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Genetics</subject><subj-group><subject>Human Genetics</subject><subj-group><subject>Genome-Wide Association Studies</subject></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Genetics</subject><subj-group><subject>Gene Expression</subject><subj-group><subject>Gene Regulation</subject></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Biochemistry</subject><subj-group><subject>Proteins</subject><subj-group><subject>Post-Translational Modification</subject><subj-group><subject>Heme</subject></subj-group></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and life sciences</subject><subj-group><subject>Biochemistry</subject><subj-group><subject>Proteins</subject><subj-group><subject>DNA-binding proteins</subject><subj-group><subject>Transcription Factors</subject></subj-group></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Genetics</subject><subj-group><subject>Gene Expression</subject><subj-group><subject>Gene Regulation</subject><subj-group><subject>Transcription Factors</subject></subj-group></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Biochemistry</subject><subj-group><subject>Proteins</subject><subj-group><subject>Regulatory Proteins</subject><subj-group><subject>Transcription Factors</subject></subj-group></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Anatomy</subject><subj-group><subject>Body Fluids</subject><subj-group><subject>Blood</subject></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Medicine and Health Sciences</subject><subj-group><subject>Anatomy</subject><subj-group><subject>Body Fluids</subject><subj-group><subject>Blood</subject></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Biology and Life Sciences</subject><subj-group><subject>Physiology</subject><subj-group><subject>Body Fluids</subject><subj-group><subject>Blood</subject></subj-group></subj-group></subj-group></subj-group><subj-group subj-group-type="Discipline-v3"><subject>Medicine and Health Sciences</subject><subj-group><subject>Physiology</subject><subj-group><subject>Body Fluids</subject><subj-group><subject>Blood</subject></subj-group></subj-group></subj-group></subj-group></article-categories><title-group><article-title>A common molecular signature of patients with sickle cell disease revealed by microarray meta-analysis and a genome-wide association study</article-title><alt-title alt-title-type="running-head">Meta-analysis of sickle cell disease related data</alt-title></title-group><contrib-group><contrib contrib-type="author"><contrib-id authenticated="true" contrib-id-type="orcid">http://orcid.org/0000-0003-0985-4881</contrib-id><name><surname>Ben Hamda</surname><given-names>Cherif</given-names></name><role content-type="http://credit.casrai.org/">Data curation</role><role content-type="http://credit.casrai.org/">Formal analysis</role><role content-type="http://credit.casrai.org/">Investigation</role><role content-type="http://credit.casrai.org/">Methodology</role><role content-type="http://credit.casrai.org/">Validation</role><role content-type="http://credit.casrai.org/">Visualization</role><role content-type="http://credit.casrai.org/">Writing – original draft</role><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff001"><sup>1</sup></xref><xref ref-type="aff" rid="aff002"><sup>2</sup></xref><xref ref-type="aff" rid="aff003"><sup>3</sup></xref><xref ref-type="corresp" rid="cor001">*</xref></contrib><contrib contrib-type="author"><name><surname>Sangeda</surname><given-names>Raphael</given-names></name><role content-type="http://credit.casrai.org/">Formal analysis</role><role content-type="http://credit.casrai.org/">Methodology</role><role content-type="http://credit.casrai.org/">Writing – original draft</role><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff004"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>Mwita</surname><given-names>Liberata</given-names></name><role content-type="http://credit.casrai.org/">Data curation</role><role content-type="http://credit.casrai.org/">Writing – original draft</role><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff004"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>Meintjes</surname><given-names>Ayton</given-names></name><role content-type="http://credit.casrai.org/">Formal analysis</role><role content-type="http://credit.casrai.org/">Methodology</role><xref ref-type="aff" rid="aff005"><sup>5</sup></xref></contrib><contrib contrib-type="author"><name><surname>Nkya</surname><given-names>Siana</given-names></name><role content-type="http://credit.casrai.org/">Data curation</role><role content-type="http://credit.casrai.org/">Methodology</role><role content-type="http://credit.casrai.org/">Resources</role><role content-type="http://credit.casrai.org/">Validation</role><xref ref-type="aff" rid="aff004"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>Panji</surname><given-names>Sumir</given-names></name><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff005"><sup>5</sup></xref></contrib><contrib contrib-type="author"><name><surname>Mulder</surname><given-names>Nicola</given-names></name><role content-type="http://credit.casrai.org/">Funding acquisition</role><role content-type="http://credit.casrai.org/">Project administration</role><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff005"><sup>5</sup></xref></contrib><contrib contrib-type="author"><name><surname>Guizani-Tabbane</surname><given-names>Lamia</given-names></name><role content-type="http://credit.casrai.org/">Writing – original draft</role><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff002"><sup>2</sup></xref><xref ref-type="aff" rid="aff006"><sup>6</sup></xref></contrib><contrib contrib-type="author"><name><surname>Benkahla</surname><given-names>Alia</given-names></name><role content-type="http://credit.casrai.org/">Writing – original draft</role><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff001"><sup>1</sup></xref><xref ref-type="aff" rid="aff002"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Makani</surname><given-names>Julie</given-names></name><role content-type="http://credit.casrai.org/">Conceptualization</role><role content-type="http://credit.casrai.org/">Funding acquisition</role><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff003"><sup>3</sup></xref></contrib><contrib contrib-type="author"><name><surname>Ghedira</surname><given-names>Kais</given-names></name><role content-type="http://credit.casrai.org/">Conceptualization</role><role content-type="http://credit.casrai.org/">Formal analysis</role><role content-type="http://credit.casrai.org/">Investigation</role><role content-type="http://credit.casrai.org/">Methodology</role><role content-type="http://credit.casrai.org/">Supervision</role><role content-type="http://credit.casrai.org/">Writing – original draft</role><role content-type="http://credit.casrai.org/">Writing – review & editing</role><xref ref-type="aff" rid="aff001"><sup>1</sup></xref><xref ref-type="aff" rid="aff002"><sup>2</sup></xref><xref ref-type="corresp" rid="cor001">*</xref></contrib><contrib contrib-type="author"><collab>H3ABioNet Consortium</collab><xref ref-type="author-notes" rid="fn001"><sup>¶</sup></xref></contrib></contrib-group><aff id="aff001"><label>1</label><addr-line>Laboratory of Bioinformatics, Biomathematics and Biostatistics, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></aff><aff id="aff002"><label>2</label><addr-line>University of Tunis El Manar, Tunis, Tunisia</addr-line></aff><aff id="aff003"><label>3</label><addr-line>Faculty of Science of Bizerte, Jarzouna, University of Carthage, Tunisia</addr-line></aff><aff id="aff004"><label>4</label><addr-line>Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania</addr-line></aff><aff id="aff005"><label>5</label><addr-line>University of Cape Town, Cape Town, South Africa</addr-line></aff><aff id="aff006"><label>6</label><addr-line>Laboratory of Medical Parasitology, Biotechnology and Biomolecules, Institute Pasteur of Tunis, Tunis, Tunisia</addr-line></aff><contrib-group><contrib contrib-type="editor"><name><surname>Abe</surname><given-names>Keiko</given-names></name><role>Editor</role><xref ref-type="aff" rid="edit1"></xref></contrib></contrib-group><aff id="edit1"><addr-line>The University of Tokyo, JAPAN</addr-line></aff><author-notes><fn fn-type="COI-statement" id="coi001"><p><bold>Competing Interests: </bold>The authors declare that they have no competing interests.</p></fn><fn fn-type="other" id="fn001"><p>¶ The complete membership of the H3ABioNet Consortium can be found in the Acknowledgments.</p></fn><corresp id="cor001">* E-mail: <email>kais.ghedira@pasteur.rns.tn</email> (KG); <email>cherifbenhamda@gmail.com</email> (CBH)</corresp></author-notes><pub-date pub-type="epub"><day>6</day><month>7</month><year>2018</year></pub-date><pub-date pub-type="collection"><year>2018</year></pub-date><volume>13</volume><issue>7</issue><elocation-id>e0199461</elocation-id><history><date date-type="received"><day>3</day><month>1</month><year>2018</year></date><date date-type="accepted"><day>7</day><month>6</month><year>2018</year></date></history><permissions><copyright-statement>© 2018 Ben Hamda et al</copyright-statement><copyright-year>2018</copyright-year><copyright-holder>Ben Hamda et al</copyright-holder><license xlink:href="http://creativecommons.org/licenses/by/4.0/"><license-p>This is an open access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License</ext-link>, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p></license></permissions><self-uri content-type="pdf" xlink:href="pone.0199461.pdf"></self-uri><abstract><p>A chronic inflammatory state to a large extent explains sickle cell disease (SCD) pathophysiology. Nonetheless, the principal dysregulated factors affecting this major pathway and their mechanisms of action still have to be fully identified and elucidated. Integrating gene expression and genome-wide association study (GWAS) data analysis represents a novel approach to refining the identification of key mediators and functions in complex diseases. Here, we performed gene expression meta-analysis of five independent publicly available microarray datasets related to homozygous SS patients with SCD to identify a consensus SCD transcriptomic profile. The meta-analysis conducted using the MetaDE R package based on combining p values (maxP approach) identified 335 differentially expressed genes (DEGs; 224 upregulated and 111 downregulated). Functional gene set enrichment revealed the importance of several metabolic pathways, of innate immune responses, erythrocyte development, and hemostasis pathways. Advanced analyses of GWAS data generated within the framework of this study by means of the atSNP R package and SIFT tool identified 60 regulatory single-nucleotide polymorphisms (rSNPs) occurring in the promoter of 20 DEGs and a deleterious SNP, affecting CAMKK2 protein function. This novel database of candidate genes, transcription factors, and rSNPs associated with SCD provides new markers that may help to identify new therapeutic targets.</p></abstract><funding-group><award-group id="award001"><funding-source><institution-wrap><institution-id institution-id-type="funder-id">http://dx.doi.org/10.13039/100000051</institution-id><institution>National Human Genome Research Institute</institution></institution-wrap></funding-source><award-id>U41HG006941</award-id><principal-award-recipient><name><surname>Mulder</surname><given-names>Nicola</given-names></name></principal-award-recipient></award-group><funding-statement>Research reported in this publication was supported by the National Institutes of Health Common Fund under grant number U41HG006941 (NM). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.</funding-statement></funding-group><counts><fig-count count="6"></fig-count><table-count count="3"></table-count><page-count count="21"></page-count></counts><custom-meta-group><custom-meta id="data-availability"><meta-name>Data Availability</meta-name><meta-value>All relevant data are within the paper and its Supporting Information files.</meta-value></custom-meta></custom-meta-group></article-meta><notes><title>Data Availability</title><p>All relevant data are within the paper and its Supporting Information files.</p></notes></front><body><sec sec-type="intro" id="sec001"><title>Introduction</title><p>Sickle cell disease (SCD) is a rare hemoglobinopathy [<xref rid="pone.0199461.ref001" ref-type="bibr">1</xref>] characterized by high morbidity and mortality. It affects millions of people throughout the world, including 300 thousand newborns annually [<xref rid="pone.0199461.ref002" ref-type="bibr">2</xref>]. The disease represents a severe genetic blood disorder caused by a single mutation in β globin [<xref rid="pone.0199461.ref003" ref-type="bibr">3</xref>] that leads to a defective hemoglobin S (HBS) protein, which upon deoxygenation polymerizes rapidly [<xref rid="pone.0199461.ref004" ref-type="bibr">4</xref>] and gives red blood cells rigidity and sickle shape. Losing flexibility, the misshapen red blood cells obstruct blood flow, disrupt homeostasis, and promote chronic hemolysis. The released heme iron into plasma creates an oxidative microenvironment resulting in inflammation and endothelial-cell activation, leading to tissue damage in almost all organs and systems.</p><p>The SCD pathophysiology is largely explained by the chronic inflammatory state [<xref rid="pone.0199461.ref005" ref-type="bibr">5</xref>] and partly by the dysregulated pro- and antiapoptotic agents [<xref rid="pone.0199461.ref006" ref-type="bibr">6</xref>]. Nonetheless, the principal dysregulated factors in these major pathways and their mechanisms of action still need to be fully identified and elucidated.</p><p>Several technologies [<xref rid="pone.0199461.ref007" ref-type="bibr">7</xref>,<xref rid="pone.0199461.ref008" ref-type="bibr">8</xref>] have been developed to identify candidate markers and have highlighted potential molecular pathways related to SCD. Among the high-throughput genomic technologies that have contributed to the identification of candidate genes and to our understanding of complex interactions in multisystem diseases is the microarray technology. Indeed, a microarray is a gene expression profiling technology that is widely used to simultaneously assess the expression levels of thousands of genes [<xref rid="pone.0199461.ref009" ref-type="bibr">9</xref>] in different disease contexts. Such high-throughput technique is considered an important tool for clinical practice and for the development of diagnostics [<xref rid="pone.0199461.ref010" ref-type="bibr">10</xref>,<xref rid="pone.0199461.ref011" ref-type="bibr">11</xref>]. Thus, its massive use in biomedical studies in the last decade has resulted in a huge quantity of data for a large number of physiological states and disease conditions [<xref rid="pone.0199461.ref012" ref-type="bibr">12</xref>]. In parallel, the constant evolution of bioinformatics tools provided the scientific community with a more effective and reproducible meta-analysis workflow [<xref rid="pone.0199461.ref013" ref-type="bibr">13</xref>–<xref rid="pone.0199461.ref020" ref-type="bibr">20</xref>] allowing for better handling of differences in study design and platforms and providing enhancement of the analytical performance, which results in a more robust and reliable analysis of gene expression signatures [<xref rid="pone.0199461.ref021" ref-type="bibr">21</xref>–<xref rid="pone.0199461.ref024" ref-type="bibr">24</xref>].</p><p>On the other hand, a genome wide association study (GWAS) is an approach that involves rapid scanning of markers (genetic variants) across the genomes of different individuals [<xref rid="pone.0199461.ref025" ref-type="bibr">25</xref>]. It focuses on association between genetic variations such as single-nucleotide polymorphisms (SNPs) and a specific disease. Recent studies have shown that integrative approach combining GWAS and gene expression data is more effective than analyzing each data type individually [<xref rid="pone.0199461.ref026" ref-type="bibr">26</xref>–<xref rid="pone.0199461.ref029" ref-type="bibr">29</xref>]. Indeed, SNPs present in the promoter regions of differentially expressed genes (DEGs) and more specifically in regulatory elements [<xref rid="pone.0199461.ref030" ref-type="bibr">30</xref>] are likely to be regulatory SNPs (rSNPs) that could mediate the binding of critical transcription factors (TFs) and consequently alter the expression of target genes [<xref rid="pone.0199461.ref031" ref-type="bibr">31</xref>]. Therefore, joint identification of rSNPs and a gene expression meta-signature will potentially advance the understanding of the disease mechanisms [<xref rid="pone.0199461.ref030" ref-type="bibr">30</xref>,<xref rid="pone.0199461.ref031" ref-type="bibr">31</xref>].</p><p>In the present study, we performed a gene expression meta-analysis to identify a consensus transcriptomic profile related to SCD, and by means of GWAS data, we investigated the involvement of rSNPs in the expression of the identified key candidate genes.</p></sec><sec sec-type="materials|methods" id="sec002"><title>Materials and methods</title><sec id="sec003"><title>Search criteria and data collection</title><p>Analysis of the publicly available microarray datasets was carried out as per PRISMA guidelines [<xref rid="pone.0199461.ref032" ref-type="bibr">32</xref>] (<xref ref-type="supplementary-material" rid="pone.0199461.s001">S1 Table</xref> and <bold><xref ref-type="fig" rid="pone.0199461.g001">Fig 1</xref></bold>). A search involving a combination of the following keywords (“sickle cell disease” and “Homo sapiens”) was performed in two public microarray expression data repositories: NCBI Gene Expression Omnibus (GEO) Datasets [<ext-link ext-link-type="uri" xlink:href="http://www.ncbi.nlm.nih.gov/geo/">http://www.ncbi.nlm.nih.gov/geo/</ext-link>] and ArrayExpress database [<ext-link ext-link-type="uri" xlink:href="http://www.ebi.ac.uk/arrayexpress/">http://www.ebi.ac.uk/arrayexpress/</ext-link>]. Studies that were publicly available by September 2016 were extracted. “Globin depleted” and “Homozygote SS” were set as sample inclusion criteria. <xref rid="pone.0199461.t001" ref-type="table">Table 1</xref> provides details on all the datasets included in this study.</p><fig id="pone.0199461.g001" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.g001</object-id><label>Fig 1</label><caption><title>A PRISMA flow diagram of a systematic database search.</title><p>The selection process of eligible microarray datasets for meta-analysis of the shared transcriptomic signatures between Sickle cell disease patients, according to Prisma 2009 flow diagram.</p></caption><graphic xlink:href="pone.0199461.g001"></graphic></fig><table-wrap id="pone.0199461.t001" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.t001</object-id><label>Table 1</label><caption><title>Characteristics of included individual microarray dataset.</title></caption><alternatives><graphic id="pone.0199461.t001g" xlink:href="pone.0199461.t001"></graphic><table frame="hsides" rules="groups"><colgroup span="1"><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col></colgroup><thead><tr><th align="center" rowspan="1" colspan="1">GEO Accession Number</th><th align="center" rowspan="1" colspan="1">Tissue</th><th align="center" rowspan="1" colspan="1">Number of samples<break></break>(Control/Cases)</th><th align="center" rowspan="1" colspan="1">Microarray Platform</th><th align="center" rowspan="1" colspan="1">Reference study</th></tr></thead><tbody><tr><td align="center" rowspan="1" colspan="1">GSE11524</td><td align="center" rowspan="1" colspan="1">Peripheral blood</td><td align="center" rowspan="1" colspan="1">30(12/18)</td><td align="center" rowspan="1" colspan="1">Affymetrix Human Genome U133 plus 2.0</td><td align="center" rowspan="1" colspan="1">[<xref rid="pone.0199461.ref033" ref-type="bibr">33</xref>]</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE16728</td><td align="center" rowspan="1" colspan="1">Peripheral blood</td><td align="center" rowspan="1" colspan="1">20(10/10)<xref ref-type="table-fn" rid="t001fn002">*</xref></td><td align="center" rowspan="1" colspan="1">Affymetrix Human Genome U133 plus 2.1</td><td align="center" rowspan="1" colspan="1">[<xref rid="pone.0199461.ref034" ref-type="bibr">34</xref>]</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE53441</td><td align="center" rowspan="1" colspan="1">Peripheral blood</td><td align="center" rowspan="1" colspan="1">34(10/24)</td><td align="center" rowspan="1" colspan="1">Affymetrix Human Genome U133 plus 2.2</td><td align="center" rowspan="1" colspan="1">[<xref rid="pone.0199461.ref035" ref-type="bibr">35</xref>]</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE31757</td><td align="center" rowspan="1" colspan="1">Whole blood</td><td align="center" rowspan="1" colspan="1">8(3/5)</td><td align="center" rowspan="1" colspan="1">Affymetrix Human Exon 1.0 ST</td><td align="center" rowspan="1" colspan="1">[<xref rid="pone.0199461.ref007" ref-type="bibr">7</xref>]</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE35007</td><td align="center" rowspan="1" colspan="1">Whole blood</td><td align="center" rowspan="1" colspan="1">251(61/190)</td><td align="center" rowspan="1" colspan="1">Illumina HumanHT-12 v4</td><td align="center" rowspan="1" colspan="1">[<xref rid="pone.0199461.ref036" ref-type="bibr">36</xref>]</td></tr></tbody></table></alternatives><table-wrap-foot><fn id="t001fn001"><p>Inclusion criteria: Only samples homozygotes SS and submitted to Globin reduction were selected.</p></fn><fn id="t001fn002"><p>*: Consists of two studies with two datasets in total</p></fn></table-wrap-foot></table-wrap></sec><sec id="sec004"><title>Data preparation and quality control</title><p>Data preprocessing and meta-analysis were carried out using MetaQC [<xref rid="pone.0199461.ref037" ref-type="bibr">37</xref>] and MetaDE [<xref rid="pone.0199461.ref018" ref-type="bibr">18</xref>], respectively. These packages of the R suite were chosen for quality control (QC) and identification of differentially expressed genes (DEGs) in microarray meta-analysis. The input gene expression table was prepared from the downloaded raw data following MetaDE guidelines [<xref rid="pone.0199461.ref018" ref-type="bibr">18</xref>]. In brief, probe IDs of an individual study were annotated to retrieve their official gene symbols using Bioconductor. The interquartile range method was applied to select the probe ID with the largest interquartile range of expression values when multiple probes matched an identical gene symbol. Individual studies that contained samples from different populations were divided into substudies and treated as independent datasets during the meta-analysis. Afterwards, the processed data were analyzed with MetaQC to compute six QC measures: (1) internal homogeneity of coexpression structure among studies (IQC); (2) external consistency of coexpression structure correlating with a pathway database (EQC); (3) accuracy of DEG detection (AQCg) or pathway identification (AQCp); and (4) consistency of differential expression ranking of genes (CQCg) or pathways (CQCp). The datasets showing good performance on at least five QC criteria were retained. <xref rid="pone.0199461.t002" ref-type="table">Table 2</xref> presents the quantitative QC measures of each dataset.</p><table-wrap id="pone.0199461.t002" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.t002</object-id><label>Table 2</label><caption><title>MetaQC quantitative quality control measures for gene expression data.</title></caption><alternatives><graphic id="pone.0199461.t002g" xlink:href="pone.0199461.t002"></graphic><table frame="hsides" rules="groups"><colgroup span="1"><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col></colgroup><thead><tr><th align="center" rowspan="1" colspan="1">Dataset</th><th align="center" rowspan="1" colspan="1">IQC</th><th align="center" rowspan="1" colspan="1">EQC</th><th align="center" rowspan="1" colspan="1">CQCg</th><th align="center" rowspan="1" colspan="1">CQCp</th><th align="center" rowspan="1" colspan="1">AQCg</th><th align="center" rowspan="1" colspan="1">AQCp</th><th align="center" rowspan="1" colspan="1">Rank</th></tr></thead><tbody><tr><td align="center" rowspan="1" colspan="1">GSE35007</td><td align="center" rowspan="1" colspan="1">2.53</td><td align="center" rowspan="1" colspan="1">3.7</td><td align="center" rowspan="1" colspan="1">301.34</td><td align="center" rowspan="1" colspan="1">307.65</td><td align="center" rowspan="1" colspan="1">145.57</td><td align="center" rowspan="1" colspan="1">220.18</td><td align="center" rowspan="1" colspan="1">2.17</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE11524</td><td align="center" rowspan="1" colspan="1">5.33</td><td align="center" rowspan="1" colspan="1">3.6</td><td align="center" rowspan="1" colspan="1">148.75</td><td align="center" rowspan="1" colspan="1">307.65</td><td align="center" rowspan="1" colspan="1">101.43</td><td align="center" rowspan="1" colspan="1">210.4</td><td align="center" rowspan="1" colspan="1">2.5</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE16728-A</td><td align="center" rowspan="1" colspan="1">3.58</td><td align="center" rowspan="1" colspan="1">3.7</td><td align="center" rowspan="1" colspan="1">145.79</td><td align="center" rowspan="1" colspan="1">307.65</td><td align="center" rowspan="1" colspan="1">78.46</td><td align="center" rowspan="1" colspan="1">157.71</td><td align="center" rowspan="1" colspan="1">3</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE31757</td><td align="center" rowspan="1" colspan="1">3.97</td><td align="center" rowspan="1" colspan="1">1.17<xref ref-type="table-fn" rid="t002fn002">*</xref></td><td align="center" rowspan="1" colspan="1">102.06</td><td align="center" rowspan="1" colspan="1">307.65</td><td align="center" rowspan="1" colspan="1">44.78</td><td align="center" rowspan="1" colspan="1">138.97</td><td align="center" rowspan="1" colspan="1">3.92</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE53441</td><td align="center" rowspan="1" colspan="1">7.02</td><td align="center" rowspan="1" colspan="1">3.82</td><td align="center" rowspan="1" colspan="1">58.5</td><td align="center" rowspan="1" colspan="1">73.32</td><td align="center" rowspan="1" colspan="1">27.43</td><td align="center" rowspan="1" colspan="1">37.71</td><td align="center" rowspan="1" colspan="1">4</td></tr><tr><td align="center" rowspan="1" colspan="1">GSE16728-B</td><td align="center" rowspan="1" colspan="1">0.41<xref ref-type="table-fn" rid="t002fn002">*</xref></td><td align="center" rowspan="1" colspan="1">3.6</td><td align="center" rowspan="1" colspan="1">33.06</td><td align="center" rowspan="1" colspan="1">212.76</td><td align="center" rowspan="1" colspan="1">18.27</td><td align="center" rowspan="1" colspan="1">88.93</td><td align="center" rowspan="1" colspan="1">5.42</td></tr></tbody></table></alternatives><table-wrap-foot><fn id="t002fn001"><p>Inclusion Criteria: Dataset with good performance in at least five quality control criteria</p></fn><fn id="t002fn002"><p>*: Low performance</p></fn></table-wrap-foot></table-wrap></sec><sec id="sec005"><title>Differential expression analysis</title><p>DEG analysis was performed with Limma software package [<xref rid="pone.0199461.ref038" ref-type="bibr">38</xref>] for each dataset independently using an adjusted p value ≤0.05, based on Benjamini–Hochberg false discovery rate (FDR) and the moderated <italic>t</italic> test. In this meta-analysis, DEGs across diseases and healthy controls were selected by means of a maximum p value (maxP) [<xref rid="pone.0199461.ref039" ref-type="bibr">39</xref>]. This method combines p values and targets DEGs that have small p values in all studies (FDR < 0.05). Significantly up- and downregulated DEGs were defined as those that showed a fold change (FC) greater than 1.4 in either direction.</p></sec><sec id="sec006"><title>Functional annotation and gene-regulatory network inference</title><p>The candidate genes identified via our meta-signature were used as input for different bioinformatics enrichment tools. Gene Ontology (GO) terms were identified in the TRANSPATH database [<xref rid="pone.0199461.ref040" ref-type="bibr">40</xref>] on the geneXplain platform [<xref rid="pone.0199461.ref041" ref-type="bibr">41</xref>]; a different pathway gene set libraries (KEGG Pathway, Reactome, and Wiki pathway), were requested by means of the EnrichR web tool [<xref rid="pone.0199461.ref042" ref-type="bibr">42</xref>]. The selection criterion for significantly enriched pathways and GO terms was a p value of 0.05 or less. Furthermore, for better result interpretation, we constructed a biological network describing the most significant over-represented GO biological process terms obtained at the previous step. In brief, we conducted two-sided (enrichment/depletion) hypergeometric distribution tests, with a p value significance level of ≤0.05, followed by the Bonferroni adjustment using the ClueGO plugin [<xref rid="pone.0199461.ref043" ref-type="bibr">43</xref>] of the Cytoscape [<xref rid="pone.0199461.ref044" ref-type="bibr">44</xref>] software.</p><p>Protein–protein (PP) interactions including physical and functional association across our set of genes were identified in stringdb 10.0 [<xref rid="pone.0199461.ref045" ref-type="bibr">45</xref>]. To gain more insights into post-transcriptional regulation of expression of DEGs, we used the complete list of our DEGs, their log FC, and the p value as input for the RNEA R [<xref rid="pone.0199461.ref046" ref-type="bibr">46</xref>] package to reconstruct a subnetwork of gene regulation.</p></sec><sec id="sec007"><title>GWAS data integration</title><p>GWAS was carried out on 1,213 individuals (HbSS and HbSb0) and gave a collection of 15,153,765 SNPs and indels related to SCD [<xref rid="pone.0199461.ref047" ref-type="bibr">47</xref>]. From those we selected 1,000 SNPs (with the best p-value ranking) affecting the genes that we identified as DE by our meta-analysis. To identify the location of each SNP within the related candidate gene, we used the list of the 1,000 SNPs as input for the VariantAnnotation Bioconductor package with 2,000 as value representing the number of base pairs upstream of the 5’- gene end and 200 representing those downstream of the 3’- gene end. SNPs occurring in coding regions were used as input for SIFT (Sorting Intolerant from Tolerant) web server—able to identify nonsynonymous SNPs and predict the effect of coding variants on protein function. The remaining SNPs (occurring in non-coding regions) were used as input for atSNP (A:ffinity T:esting for regulatory SNP: s) R package [<xref rid="pone.0199461.ref042" ref-type="bibr">42</xref>] to predict the regulatory variants (rSNPs). This software later computes an affinity score for the genomic sequences around each SNP (±30 bp) against a library of TF motifs for both alleles (reference and SNP allele) using their corresponding position-weighted matrices (PWMs). SNPs with a significant change in the affinity scores between the reference and SNP alleles were then hypothesized as rSNPs. We selected ENCODE PWMs as a TF motif library and set a p value corrected by the Benjamini–Hochberg criterion in the rank test between alleles (pval_rank_bh) to less than 0.1 to select significant rSNPs.</p><p>The main steps of the bioinformatics workflow integrating microarray meta-analysis and GWAS data are described in <bold><xref ref-type="fig" rid="pone.0199461.g002">Fig 2</xref></bold>.</p><fig id="pone.0199461.g002" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.g002</object-id><label>Fig 2</label><caption><title>Workflow of microarray meta-analysis integrating GWAS data.</title><p>A flow diagram depicting the process involved in the meta-analysis of the selected microarray datasets with integration of GWAS data.</p></caption><graphic xlink:href="pone.0199461.g002"></graphic></fig></sec></sec><sec sec-type="results" id="sec008"><title>Results</title><sec id="sec009"><title>Data mining and quality assessment</title><p>Five case-control studies (GSE11524, GSE16728, GSE53441, GSE31757 and GSE35007) satisfying the fixed inclusion criteria were selected for this meta-analysis. GSE16728 includes two cohorts; each cohort was regarded as a different dataset and was analyzed separately. Sample sources were either peripheral blood or whole blood subjected to globin mRNA depletion [<xref rid="pone.0199461.ref048" ref-type="bibr">48</xref>]. The retained studies included 343 samples representing a total of 247 homozygous SCD patients and 96 healthy controls. <xref rid="pone.0199461.t001" ref-type="table">Table 1</xref> provides detailed information about the datasets, sample types, study references, and the microarray platforms used here. All expression-processed raw data that yielded a high score at the QC step are presented in <xref rid="pone.0199461.t002" ref-type="table">Table 2</xref>.</p></sec><sec id="sec010"><title>Identification of the gene expression meta-signature</title><p>A shared transcriptional signature among SCD patients was identified by a meta-analysis of the retained datasets by combining p values according to the stringent maxP method [<xref rid="pone.0199461.ref039" ref-type="bibr">39</xref>]. The raw data were loaded into the R environment and analyzed using the R package MetaDE. Non-DEGs as well as those showing small variation and expression intensities across the majority of datasets and contributing to the FDR were filtered out. The statistical framework (maxP) identified highly significant biomarkers that are differentially expressed in all studies: 335 DEGs including 224 overexpressed and 111 underexpressed genes satisfying the significance threshold of FDR < 0.05 (see <xref ref-type="supplementary-material" rid="pone.0199461.s002">S2 Table</xref>).</p><p>The top 10 upregulated and top 10 downregulated DEGs are presented in <xref rid="pone.0199461.t003" ref-type="table">Table 3</xref>, along with the average FC in expression. Among these, DnaJ heat shock protein family (Hsp40) member C6 (<italic>DNAJC6</italic>), ring finger protein 182 (<italic>RNF182</italic>), and carbonic anhydrase I (<italic>CA1</italic>) were the most significantly overexpressed genes, whereas Wntless Wnt ligand secretion mediator (<italic>WLS</italic>), Transcription factor 7-like 2 (T-cell specific, HMG-box) (<italic>TCF7L2</italic>), and G protein-coupled receptor 171 (<italic>GPR171</italic>) were the most underexpressed genes (<xref rid="pone.0199461.t003" ref-type="table">Table 3</xref>).</p><table-wrap id="pone.0199461.t003" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.t003</object-id><label>Table 3</label><caption><title>Top 20 shared DEGs identified in the meta-analysis ranked by average Log2FC.</title></caption><alternatives><graphic id="pone.0199461.t003g" xlink:href="pone.0199461.t003"></graphic><table frame="hsides" rules="groups"><colgroup span="1"><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col><col align="left" valign="middle" span="1"></col></colgroup><thead><tr><th align="center" rowspan="1" colspan="1">Entrez Gene ID</th><th align="center" rowspan="1" colspan="1">HGNC Gene symbol</th><th align="center" rowspan="1" colspan="1">Gene Description</th><th align="center" rowspan="1" colspan="1">Average Log2FC</th><th align="center" rowspan="1" colspan="1">FDR</th></tr></thead><tbody><tr><td align="left" colspan="5" rowspan="1"><bold>Top 10 upregulated Genes</bold></td></tr><tr><td align="center" rowspan="1" colspan="1">9829</td><td align="center" rowspan="1" colspan="1"><italic>DNAJC6</italic></td><td align="left" rowspan="1" colspan="1">DnaJ heat shock protein family (Hsp40) member C6</td><td align="center" rowspan="1" colspan="1">4,938</td><td align="center" rowspan="1" colspan="1">0,017</td></tr><tr><td align="center" rowspan="1" colspan="1">221687</td><td align="center" rowspan="1" colspan="1"><italic>RNF182</italic></td><td align="left" rowspan="1" colspan="1">Ring finger protein 182</td><td align="center" rowspan="1" colspan="1">4,003</td><td align="center" rowspan="1" colspan="1">0,002</td></tr><tr><td align="center" rowspan="1" colspan="1">759</td><td align="center" rowspan="1" colspan="1"><italic>CA1</italic></td><td align="left" rowspan="1" colspan="1">carbonic anhydrase I</td><td align="center" rowspan="1" colspan="1">3,366</td><td align="center" rowspan="1" colspan="1">1,38E-18</td></tr><tr><td align="center" rowspan="1" colspan="1">3045</td><td align="center" rowspan="1" colspan="1"><italic>HBD</italic></td><td align="left" rowspan="1" colspan="1">Hemoglobin subunit delta</td><td align="center" rowspan="1" colspan="1">3,294</td><td align="center" rowspan="1" colspan="1">1,38E-18</td></tr><tr><td align="center" rowspan="1" colspan="1">2994</td><td align="center" rowspan="1" colspan="1"><italic>GYPB</italic></td><td align="left" rowspan="1" colspan="1">Glycophorin B (MNS blood group)</td><td align="center" rowspan="1" colspan="1">3,246</td><td align="center" rowspan="1" colspan="1">1,38E-18</td></tr><tr><td align="center" rowspan="1" colspan="1">9911</td><td align="center" rowspan="1" colspan="1"><italic>TMCC2</italic></td><td align="left" rowspan="1" colspan="1">Transmembrane and coiled-coil domain family 2</td><td align="center" rowspan="1" colspan="1">3,166</td><td align="center" rowspan="1" colspan="1">1,38E-18</td></tr><tr><td align="center" rowspan="1" colspan="1">2993</td><td align="center" rowspan="1" colspan="1"><italic>GYPA</italic></td><td align="left" rowspan="1" colspan="1">Glycophorin A (MNS blood group)</td><td align="center" rowspan="1" colspan="1">3,070</td><td align="center" rowspan="1" colspan="1">1,38E-18</td></tr><tr><td align="center" rowspan="1" colspan="1">8140</td><td align="center" rowspan="1" colspan="1"><italic>SLC7A5</italic></td><td align="left" rowspan="1" colspan="1">Solute carrier family 7 (amino acid transporter light chain, L system), member 5</td><td align="center" rowspan="1" colspan="1">2,999</td><td align="center" rowspan="1" colspan="1">0,0004</td></tr><tr><td align="center" rowspan="1" colspan="1">66008</td><td align="center" rowspan="1" colspan="1"><italic>TRAK2</italic></td><td align="left" rowspan="1" colspan="1">Trafficking protein, kinesin binding 2</td><td align="center" rowspan="1" colspan="1">2,985</td><td align="center" rowspan="1" colspan="1">0,023</td></tr><tr><td align="center" rowspan="1" colspan="1">493856</td><td align="center" rowspan="1" colspan="1"><italic>CISD2</italic></td><td align="left" rowspan="1" colspan="1">CDGSH iron sulfur domain 2</td><td align="center" rowspan="1" colspan="1">2,980</td><td align="center" rowspan="1" colspan="1">1,38E-18</td></tr><tr><td align="left" colspan="5" rowspan="1"><bold>Top 10 downregulated Genes</bold></td></tr><tr><td align="center" rowspan="1" colspan="1">79971</td><td align="center" rowspan="1" colspan="1"><italic>WLS</italic></td><td align="left" rowspan="1" colspan="1">Wntless Wnt ligand secretion mediator</td><td align="center" rowspan="1" colspan="1">-1,766</td><td align="center" rowspan="1" colspan="1">0,036</td></tr><tr><td align="center" rowspan="1" colspan="1">6934</td><td align="center" rowspan="1" colspan="1"><italic>TCF7L2</italic></td><td align="left" rowspan="1" colspan="1">Transcription factor 7-like 2 (T-cell specific, HMG-box)</td><td align="center" rowspan="1" colspan="1">-1,562</td><td align="center" rowspan="1" colspan="1">0,016</td></tr><tr><td align="center" rowspan="1" colspan="1">29909</td><td align="center" rowspan="1" colspan="1"><italic>GPR171</italic></td><td align="left" rowspan="1" colspan="1">G protein-coupled receptor 171</td><td align="center" rowspan="1" colspan="1">-1,523</td><td align="center" rowspan="1" colspan="1">0,027</td></tr><tr><td align="center" rowspan="1" colspan="1">79668</td><td align="center" rowspan="1" colspan="1"><italic>PARP8</italic></td><td align="left" rowspan="1" colspan="1">Poly(ADP-ribose) polymerase family member 8</td><td align="center" rowspan="1" colspan="1">-1,344</td><td align="center" rowspan="1" colspan="1">0,002</td></tr><tr><td align="center" rowspan="1" colspan="1">64167</td><td align="center" rowspan="1" colspan="1"><italic>ERAP2</italic></td><td align="left" rowspan="1" colspan="1">Endoplasmic reticulum aminopeptidase 2</td><td align="center" rowspan="1" colspan="1">-1,343</td><td align="center" rowspan="1" colspan="1">0,048</td></tr><tr><td align="center" rowspan="1" colspan="1">91526</td><td align="center" rowspan="1" colspan="1"><italic>ANKRD44</italic></td><td align="left" rowspan="1" colspan="1">Ankyrin repeat domain 44</td><td align="center" rowspan="1" colspan="1">-1,300</td><td align="center" rowspan="1" colspan="1">0,001</td></tr><tr><td align="center" rowspan="1" colspan="1">5788</td><td align="center" rowspan="1" colspan="1"><italic>PTPRC</italic></td><td align="left" rowspan="1" colspan="1">Protein tyrosine phosphatase, receptor type, C</td><td align="center" rowspan="1" colspan="1">-1,275</td><td align="center" rowspan="1" colspan="1">0,005</td></tr><tr><td align="center" rowspan="1" colspan="1">1362</td><td align="center" rowspan="1" colspan="1"><italic>CPD</italic></td><td align="left" rowspan="1" colspan="1">Carboxypeptidase D</td><td align="center" rowspan="1" colspan="1">-1,209</td><td align="center" rowspan="1" colspan="1">0,030</td></tr><tr><td align="center" rowspan="1" colspan="1">50852</td><td align="center" rowspan="1" colspan="1"><italic>TRAT1</italic></td><td align="left" rowspan="1" colspan="1">T cell receptor associated transmembrane adaptor 1</td><td align="center" rowspan="1" colspan="1">-1,169</td><td align="center" rowspan="1" colspan="1">0,009</td></tr><tr><td align="center" rowspan="1" colspan="1">23224</td><td align="center" rowspan="1" colspan="1"><italic>SYNE2</italic></td><td align="left" rowspan="1" colspan="1">Spectrin repeat containing, nuclear envelope 2</td><td align="center" rowspan="1" colspan="1">-1,159</td><td align="center" rowspan="1" colspan="1">0,047</td></tr></tbody></table></alternatives></table-wrap></sec><sec id="sec011"><title>Network construction</title><p>PP interaction analysis was conducted to identify the key hub genes among our 335 DEGs. Using the STRING database [<xref rid="pone.0199461.ref045" ref-type="bibr">45</xref>], we generated a PP interaction network among 175 nodes with a high confidence score of 0.7. For better visualization of the network, we extracted the most connected components that represent the 139 major nodes of the network. These included 139 proteins and 278 edges representing the interactions within <bold><xref ref-type="fig" rid="pone.0199461.g003">Fig 3A</xref>.</bold> Based on network topology measures, a list of top 10 hub genes was compiled (see <xref ref-type="supplementary-material" rid="pone.0199461.s003">S3 Table</xref>). Four key hub genes that showed a higher score in both degree and betweenness-centrality metrics are coding for S-phase kinase-associated protein 1 (SKP1; degree = 15, betweenness centrality = 0.35), HECT and RLD domain-containing E3 ubiquitin protein ligase 5 (HERC5; degree = 13, betweenness centrality = 0.14), NSF attachment protein alpha (NAPA; degree = 12, betweenness centrality = 0.32), and erythrocyte membrane protein band 4.2 (EPB42; degree = 12, betweenness centrality = 0.22). Uploading the 139 proteins via the CytoCluster Cytoscape plugin extracted the top-ranked clusters as a subnetwork. These included SKP1 (25 nodes and 73 edges) and EPB42 (22 nodes and 52 edges). Both subnetworks are independent protein complexes with their interacting nodes likely to work collectively to perform biological functions listed in <xref ref-type="fig" rid="pone.0199461.g003">Fig 3B and 3C</xref>.</p><fig id="pone.0199461.g003" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.g003</object-id><label>Fig 3</label><caption><title>Network-based meta-analysis of hub genes.</title><p><bold>A:</bold> Protein interaction network analysis indicates a central role for SKP1, NAPA, EPB42, and ARPC5 in SCD anemia. All 335 genes served as input for the STRING database with the high confidence interaction score 0.7, and a network was built by means of Cytoscape. The network topology was analyzed by the Cytoscape NetworkAnalyzer tool, and then network topology measures such as the degree (represented by the node size scale), betweenness (represented by police size scale), closeness centrality, and clustering coefficient were calculated. <bold>B and C:</bold> The top-ranked subnetwork identified by the OH-PIN algorithm (threshold: 2, overlapping score 0.5) using CytoCluster (a Cytoscape plugin).</p></caption><graphic xlink:href="pone.0199461.g003"></graphic></fig><p>To gain insight into the regulatory system upstream of the identified DEGs, we employed the Regulatory Network Enrichment Analysis (RNEA) bioinformatics tool that extracts lists of prioritized TFs. A regulatory subnetwork showing the interaction of activated regulators with their target genes and with one another is shown in <bold><xref ref-type="fig" rid="pone.0199461.g004">Fig 4</xref></bold>.</p><fig id="pone.0199461.g004" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.g004</object-id><label>Fig 4</label><caption><title>Transcriptional regulatory subnetwork based on microarray meta-analysis.</title><p>Regulatory network analysis was performed using RNEA R/package to determine the regulation complexes upstream of DEGs identified in the meta-analysis. Genes carrying in their promoter, a significant regulatory SNPs are marked by a yellow star. Each node represents a DEG or enriched transcription factor, depending on their shapes. The node size indicate greater significance of the enrichment. The edges reflect the relationships between the nodes.</p></caption><graphic xlink:href="pone.0199461.g004"></graphic></fig></sec><sec id="sec012"><title>Identification of regulatory and nonsynonymous SNPs</title><p>Identifying potential rSNPs is crucial for understanding disease mechanisms. From a subset of the most significant 1,000 DEGs associated SNPs (retrieved from GWAS data analysis based on P-value) and using the atSNP R package [<xref rid="pone.0199461.ref015" ref-type="bibr">15</xref>], we evaluated the regulatory potential of 789 SNPs (occurring in non-coding regions) by comparing them with a motif library of 2,065 PWMs from the ENCODE project [<xref rid="pone.0199461.ref016" ref-type="bibr">16</xref>]. The analysis revealed a total of 60 significant rSNPs that affect gene regulation of 20 candidate disease genes out of 335 DEGs. These SNPs affect binding affinity of TFs for their target promoter (full results are in <xref ref-type="supplementary-material" rid="pone.0199461.s004">S4 Table</xref>). Besides, we identified seven TFs (<xref ref-type="fig" rid="pone.0199461.g004">Fig 4</xref>) carrying rSNPs such as NFE2, which plays a prominent role in the hematopoietic stem cell differentiation pathway.</p><p>We next evaluated the functional impact of the remaining coding variants (211 SNPs out of 1,000 SNPs) in the affected proteins. According to SIFT, one nonsynonymous SNP (rs1132780) was predicted as damaging with a significant score of 0.042 (results are in <xref ref-type="supplementary-material" rid="pone.0199461.s005">S5 Table</xref>). Rs1132780 occurs in the coding region of the calcium/calmodulin-dependent protein kinase kinase 2 (CAMKK2) gene and affects all its catalytic domain isoforms with an amino acid change from arginine to cysteine at position 363 of the protein.</p></sec><sec id="sec013"><title>Gene set enrichment analysis for identification of over-represented biological pathways and GO terms</title><p>Enriched GO biological process terms and biological pathways associated with our complete list of DEGs and showing a p value <0.05 were identified by means of both geneXplain and EnrichR tools (full results are in <xref ref-type="supplementary-material" rid="pone.0199461.s006">S6 Table</xref>). Among the top significant terms identified were those associated with an innate immune response, oxidative stress, hemostasis, and hemopoiesis (<bold><xref ref-type="fig" rid="pone.0199461.g005">Fig 5</xref></bold>). Relevant GO terms identified only on the basis of the list of DEGs carrying rSNPs were associated mainly with B-cell proliferation, T-cell differentiation, B-cell activation involved in an immune response, and T-cell lineage commitment.</p><fig id="pone.0199461.g005" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.g005</object-id><label>Fig 5</label><caption><title>Over-representation of pathways and GO categories in biological networks identified by the meta-analysis.</title><p>Network representation of an enriched pathway integrating biological processes on the DEG list according to the ClueGO Cytoscape plugin. Hypergeometric (right-handed) enrichment distribution tests were conducted with a p value significance level of ≤0.05, followed by the Bonferroni adjustment for the terms, and thus leading term groups were selected based on the highest significance. Each node represents a biological process. The edges reflect the relationships between the terms based on the similarity of their associated genes. The node size and deeper color indicate greater significance of the enrichment.</p></caption><graphic xlink:href="pone.0199461.g005"></graphic></fig></sec></sec><sec sec-type="conclusions" id="sec014"><title>Discussion</title><p>SCD is a monogenic disorder characterized by chronic hemolytic anemia and episodic vaso-occlusion. These major pathological signs are primarily triggered by the polymerization of defective hemoglobin S [<xref rid="pone.0199461.ref049" ref-type="bibr">49</xref>] and end with a sustained inflammatory response and tissue damage. Multiple cell types are involved in the chronic inflammatory state and are associated with SCD severity, including leukocytes, activated monocytes, neutrophils, and platelets [<xref rid="pone.0199461.ref050" ref-type="bibr">50</xref>–<xref rid="pone.0199461.ref052" ref-type="bibr">52</xref>]. In addition, SCD patients show higher levels of several molecules that promote inflammation, including heme and proinflammatory cytokines, such as TNF-α, IL-1β, and IL-8 [<xref rid="pone.0199461.ref053" ref-type="bibr">53</xref>–<xref rid="pone.0199461.ref055" ref-type="bibr">55</xref>], which enhance the vaso-occlusive process [<xref rid="pone.0199461.ref053" ref-type="bibr">53</xref>,<xref rid="pone.0199461.ref056" ref-type="bibr">56</xref>] and aggravate the disease.</p><p>The inflammatory response thus plays a prominent role in SCD pathophysiology [<xref rid="pone.0199461.ref051" ref-type="bibr">51</xref>] and needs to be resolved to help control the disease and prevent the subsequent damage to organs. Nevertheless, the mechanisms that determine the appearance of the inflammatory response and its persistence (which exacerbates the symptoms of SCD patients) and the factors involved still need to be clarified.</p><p>Here, we set up a full complete 'omics bioinformatics pipeline to further delineate the relation between SCD patients’ transcriptomics profile and the pathophysiology of the disease focusing especially on the inflammatory response.</p><p>Several individual microarray-based gene expression studies related to SCD have been published in recent years and were made available for public reuse. On the other hand, the small number of individuals analyzed in each study is an obstacle for the identification of a consensus set of DEGs. A meta-analysis of the available data should reduce study bias, increase statistical power, and improve the overall biological-process understanding [<xref rid="pone.0199461.ref057" ref-type="bibr">57</xref>,<xref rid="pone.0199461.ref058" ref-type="bibr">58</xref>], which may lead to therapeutic-target discovery [<xref rid="pone.0199461.ref059" ref-type="bibr">59</xref>,<xref rid="pone.0199461.ref060" ref-type="bibr">60</xref>].</p><p>In the present study, we not only increased the sample size of individuals subjected to the meta-analysis but also overcame the heterogeneity of the disease expression across both SCD patients and individual datasets by means of a bioinformatics approach that takes into account the between-study and within-study variation.</p><p>Our meta-analysis, using all public eligible SCD raw data [<xref rid="pone.0199461.ref007" ref-type="bibr">7</xref>,<xref rid="pone.0199461.ref033" ref-type="bibr">33</xref>–<xref rid="pone.0199461.ref036" ref-type="bibr">36</xref>] produced a consensus shared DEG profile. Indeed, we identified 335 DEGs, which include 224 upregulated and 111 downregulated genes having FDR < 0.05. Among these, we found the already known set of genes previously reported to be associated with SCD, e.g., <italic>KLF1</italic> (Krüppel-like factor 1) [<xref rid="pone.0199461.ref061" ref-type="bibr">61</xref>,<xref rid="pone.0199461.ref062" ref-type="bibr">62</xref>] and <italic>HBD</italic> (hemoglobin subunit delta), as well as more than 130 candidate genes found to be differentially expressed by a preceding meta-analysis despite a different statistical framework that was applied to only two datasets [<xref rid="pone.0199461.ref063" ref-type="bibr">63</xref>].</p><p>The gene set enrichment and pathway analysis of our DEG set revealed the importance of <bold>innate immunity</bold> (regulation and activation of innate immune response “GO:0002218, GO:0045088,” innate immune system “R-HSA-168249,” interferon alpha/beta signaling “R-HSA-909733,” the type I interferon signaling pathway “GO:0060337,” and the IL-6 signaling pathway, <italic>Homo sapiens</italic> “WP364”), <bold>hemostasis</bold> (blood coagulation “GO:0007596,” platelet activation “hsa04611,” and positive regulation of the MAPK cascade “GO:0043410”), a <bold>response to stress</bold> (oxidative stress “WP408,” glutathione metabolism “WP100”) and <bold>hemopoiesis</bold> (erythrocyte development “GO:0048821,” myeloid cell development “GO:0061515”) pathways. <bold>Heme biosynthesis</bold> and <bold>apoptosis</bold> were also found among the significant biological terms (a complete list is provided in <xref ref-type="supplementary-material" rid="pone.0199461.s006">S6 Table</xref>).</p><p>The results of the PP interaction analysis supported those obtained by the gene enrichment analysis. Indeed, among the top predicted hub genes sorted by degree and betweenness centrality, we found genes that play a prominent role in innate immunity pathways (<italic>HERC5</italic>, <italic>HERC6</italic>), hemopoiesis (<italic>AHSP</italic>), and heme biosynthesis (<italic>ALAS2</italic>). The latter (5'-aminolevulinate synthase) encodes a major regulatory enzyme in erythrocytes [<xref rid="pone.0199461.ref064" ref-type="bibr">64</xref>]. This protein is the rate-limiting enzyme in heme synthesis and contributes to regulation of heme (iron-containing molecule) synthesis preventing free-iron accumulation and subsequent organ damage [<xref rid="pone.0199461.ref065" ref-type="bibr">65</xref>].</p><p>Our findings showing the increase in <italic>ALAS2</italic> transcription (logFC = 1.9) are in agreement with the previously reported higher heme concentration measured in SCD patients’ groups (steady state and crisis) when compared with healthy individuals [<xref rid="pone.0199461.ref066" ref-type="bibr">66</xref>]. This high heme level has been shown to induce inflammation and to increase vascular permeability, adhesion molecule expression, and leukocyte recruitment [<xref rid="pone.0199461.ref067" ref-type="bibr">67</xref>,<xref rid="pone.0199461.ref068" ref-type="bibr">68</xref>] and has been suggested to contribute to severe clinical manifestations of SCD [<xref rid="pone.0199461.ref069" ref-type="bibr">69</xref>]. Accordingly, we did not notice either the transcription of heme oxygenase gene (<italic>HMOX1</italic>; coding for the enzyme regulating catalytic cleavage of heme groups) or the expression of the master TF <italic>NRF2</italic> (its protein product regulates the transcription of most of antioxidant genes). This observation is in line with another study showing that a large proportion of SCD patients have a relatively modest HMOX1 plasma concentration due in part to a hyporesponsive <italic>HMOX1</italic> promoter [<xref rid="pone.0199461.ref070" ref-type="bibr">70</xref>]. Nevertheless, our results revealed transcriptional induction of other antioxidant genes such as <italic>GPX1</italic>, <italic>GCLC</italic>, <italic>CAT</italic>, <italic>PINK1</italic>, <italic>SESN3</italic>, <italic>UBQLN1</italic>, <italic>CD36</italic>, and <italic>SNCA</italic>.</p><p>Carbon monoxide (CO), one of the products of HMOX1, has been widely studied for its therapeutic potential [<xref rid="pone.0199461.ref071" ref-type="bibr">71</xref>–<xref rid="pone.0199461.ref075" ref-type="bibr">75</xref>]. Indeed, administration of CO and biliverdin inhibits vascular inflammation and vaso-occlusion in mouse models of SCD [<xref rid="pone.0199461.ref072" ref-type="bibr">72</xref>]. Furthermore, HMOX1 induction has had a beneficial effect in several pathological conditions [<xref rid="pone.0199461.ref076" ref-type="bibr">76</xref>] including chronic nephropathy [<xref rid="pone.0199461.ref077" ref-type="bibr">77</xref>]: an SCD-related pathology. HMOX1 inducers may thus help to decrease heme concentration and consequently reduce the inflammatory responses that worsen the patients’ symptoms; i.e., HMOX1 inducers may be beneficial to SCD patients.</p><p>For a better understanding of the transcriptional mechanisms that regulate our DEGs, we constructed a gene-regulatory subnetwork associated with SCD (<bold><xref ref-type="fig" rid="pone.0199461.g004">Fig 4</xref></bold>). According to the network topology analysis, the nuclear factor-kappa B (NF-κB) remained the top hub-enriched TF. NF-κB regulates several physiological responses, including transcription of a large set of proinflammatory-cytokine genes [<xref rid="pone.0199461.ref078" ref-type="bibr">78</xref>] usually upregulated in SCD [<xref rid="pone.0199461.ref053" ref-type="bibr">53</xref>–<xref rid="pone.0199461.ref055" ref-type="bibr">55</xref>]. Our results indicate the increased transcription of various proinflammatory-cytokine genes including <italic>IL-6</italic>, <italic>IL-12</italic>, and <italic>IL-18</italic> and cytokine receptor genes such as <italic>IL-17RD</italic> and <italic>IL-17RC</italic> even if the increased expression of these transcripts was below the cutoff.</p><p>At the same time, using GWAS data, from the identified polymorphisms we extracted the rSNPs occurring in the promoter region of our DEGs and gained an important insight into the regulatory complexes governing these gene expression patterns. Our analysis revealed the occurrence of 60 rSNPs in promoter DNA sequences of 20 genes (<xref ref-type="supplementary-material" rid="pone.0199461.s004">S4 Table</xref>), including <italic>NFE2</italic>, <italic>HDAC4</italic>, <italic>PI3K</italic>δ, and <italic>PI3K</italic>γ.</p><p>Among the top significant enriched GO terms and biological pathways associated with the subset of these 20 candidate disease-associated genes were those primarily related to T-cell activation/differentiation; alpha-beta, gamma-delta, and regulatory T-cell differentiation; T-cell lineage commitment; and B-cell proliferation or activation. This result is highly consistent with the alteration of a lymphocyte count [<xref rid="pone.0199461.ref079" ref-type="bibr">79</xref>], phenotype, and function associated with SCD [<xref rid="pone.0199461.ref080" ref-type="bibr">80</xref>]. This alteration in the acquired immunity may explain the increased risk of severe bacterial infections among these patients [<xref rid="pone.0199461.ref081" ref-type="bibr">81</xref>,<xref rid="pone.0199461.ref082" ref-type="bibr">82</xref>]. Indeed, different studies have shown that SCD patients have a decreased T-lymphocyte count and increased B-lymphocyte count either at baseline or in acute crisis [<xref rid="pone.0199461.ref083" ref-type="bibr">83</xref>]. Of note, T-cell lymphopenia–associated inflammatory responses have been previously linked to the inactivation of <italic>PI3K</italic>δ and <italic>PI3K</italic>γ [<xref rid="pone.0199461.ref084" ref-type="bibr">84</xref>], genes of two PI3K isoforms that we found to be significantly downregulated and to carry rSNPs (log<sub>2</sub>FC: -0.94 and -0.56, respectively) in this analysis. This finding suggests that the downregulation of these kinase genes, predominantly expressed in the hematopoietic system [<xref rid="pone.0199461.ref085" ref-type="bibr">85</xref>], may be implicated in the profound lymphopenia observed in SCD patients.</p><p>Our gene-regulatory network also showed significant overexpression of the TF nuclear factor-erythroid 2 (<italic>NFE2</italic>). The expression of this TF is activated by CREB1 and repressed by MYC TFs. Promoter analysis revealed that <italic>NFE2</italic> is affected by five rSNPs including rs35702801 and rs34155291 (<xref ref-type="supplementary-material" rid="pone.0199461.s007">S7 Table</xref>) that are predicted to disrupt several MYC motifs but not to affect the affinity of CREB1 binding. These rSNPs by altering TF MYC binding may hence explain the overexpression of <italic>NFE2</italic> observed in SCD patients. Some studies have shown that elevated expression of <italic>NFE2</italic> modulates proinflammatory cytokine IL-8 expression in myeloid cells [<xref rid="pone.0199461.ref086" ref-type="bibr">86</xref>] and causes a high neutrophil count in a murine model [<xref rid="pone.0199461.ref087" ref-type="bibr">87</xref>]. We suggest here that overexpression of <italic>NFE2</italic> may contribute to the neutrophilia associated with the severity of SCD. This neutrophilia may be—as suggested by others—accentuated by the alteration of neutrophil apoptosis, which leads to neutrophil accumulation in blood [<xref rid="pone.0199461.ref088" ref-type="bibr">88</xref>]. Accordingly, our results reveal downregulation of the DEGs involved in the positive (“GO:1902043”) and negative (“GO:2001237”) regulation of the extrinsic apoptotic signaling pathway (<bold><xref ref-type="fig" rid="pone.0199461.g006">Fig 6</xref></bold>).</p><fig id="pone.0199461.g006" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0199461.g006</object-id><label>Fig 6</label><caption><title>Downregulated and upregulated DEGs involved in apoptosis pathways.</title><p>The inner ring is a bar plot where the height of the bar indicates the significance of the term (−log<sub>10</sub> adjusted <italic>p</italic> value), and color corresponds to the <italic>z</italic>-score. The outer ring displays scatterplots of the expression levels (log2FC) for the genes in each term.</p></caption><graphic xlink:href="pone.0199461.g006"></graphic></fig><p>Additionally, the GWAS revealed a nonsynonymous SNP occurring in <italic>CAMKK2</italic>’s protein-coding region (<xref ref-type="supplementary-material" rid="pone.0199461.s005">S5 Table</xref>), transforming arginine to cysteine at position 363 present in all CAMKK2 protein isoforms including the active isoforms 1, 2, and 3. Thus, besides the downregulation, the amino acid change affecting the catalytic domain was predicted by the SIFT analysis to be a deleterious SNP with a significant damage score (0.041). CAMKK2 belongs to a family of Ca<sup>2+</sup>/CaM-dependent, highly versatile serine/threonine kinases that catalyze the phosphorylation of (and have high affinity for) mainly three substrates: CAMK1, CAMK4, and AKT. CAMKK2 was reported to be exclusively expressed in the myeloid lineage [<xref rid="pone.0199461.ref089" ref-type="bibr">89</xref>] and participates in the regulation of several relevant physiological and pathophysiological processes, including hematopoiesis, cancer, inflammation, and immune responses. It was recently reported that under stressful conditions in immune cells, the loss of CAMKK2 promotes differentiation (both in bone marrow and peripheral-blood cells) of common myeloid progenitors toward granulocyte and monocyte precursor cells rather than megakaryocytes or erythrocytes [<xref rid="pone.0199461.ref089" ref-type="bibr">89</xref>]. This nonsynonymous SNP occurring in <italic>CAMKK2</italic>’s protein-coding region may thus also contribute to the increase in the neutrophil number (the most abundant type of granulocytes). Yet, the granulopoiesis state can be reversed by the re-expression of <italic>CAMKK2</italic>. Further research is needed to determine whether the CAMKK2 protein present in the blood of SCD patients shows an altered activity.</p><p>In conclusion, besides previously reported genes, our meta-signature contains a new subset of genes identified for the first time as associated with SCD. Among these, <italic>ALAS2</italic> belonging to heme metabolism is well known to be associated with SCD, as are PI3K delta and gamma isoforms involved in T-cell differentiation. The present analysis yielded a large database of rSNPs and candidate genes that may be helpful for future studies dealing with the pathogenesis and complexity of SCD.</p></sec><sec sec-type="supplementary-material" id="sec015"><title>Supporting information</title><supplementary-material content-type="local-data" id="pone.0199461.s001"><label>S1 Table</label><caption><title>Preferred reporting items for systematic reviews and meta-analyses (PRISMA).</title><p>Guidelines Checklist.</p><p>(PDF)</p></caption><media xlink:href="pone.0199461.s001.pdf"><caption><p>Click here for additional data file.</p></caption></media></supplementary-material><supplementary-material content-type="local-data" id="pone.0199461.s002"><label>S2 Table</label><caption><title>Complete list of differentially-expressed genes obtained from the meta-analysis.</title><p>(XLSX)</p></caption><media xlink:href="pone.0199461.s002.xlsx"><caption><p>Click here for additional data file.</p></caption></media></supplementary-material><supplementary-material content-type="local-data" id="pone.0199461.s003"><label>S3 Table</label><caption><title>Top 10 hub genes.</title><p>(XLSX)</p></caption><media xlink:href="pone.0199461.s003.xlsx"><caption><p>Click here for additional data file.</p></caption></media></supplementary-material><supplementary-material content-type="local-data" id="pone.0199461.s004"><label>S4 Table</label><caption><title>The rSNPs located in the promoter region and altering TF-binding sites’ affinity identified by the atSNP R package.</title><p>(XLSX)</p></caption><media xlink:href="pone.0199461.s004.xlsx"><caption><p>Click here for additional data file.</p></caption></media></supplementary-material><supplementary-material content-type="local-data" id="pone.0199461.s005"><label>S5 Table</label><caption><title>Evaluation of the functional impact of the coding variants in the affected candidate gene proteins using Sift software.</title><p>(XLSX)</p></caption><media xlink:href="pone.0199461.s005.xlsx"><caption><p>Click here for additional data file.</p></caption></media></supplementary-material><supplementary-material content-type="local-data" id="pone.0199461.s006"><label>S6 Table</label><caption><title>Gene set enrichment analyses of biological processes and metabolic pathways using multiple tools.</title><p>(XLSX)</p></caption><media xlink:href="pone.0199461.s006.xlsx"><caption><p>Click here for additional data file.</p></caption></media></supplementary-material><supplementary-material content-type="local-data" id="pone.0199461.s007"><label>S7 Table</label><caption><title>rSNPs located in the promoter region of NFE2 and altering MYC-binding sites’ affinity.</title><p>(XLSX)</p></caption><media xlink:href="pone.0199461.s007.xlsx"><caption><p>Click here for additional data file.</p></caption></media></supplementary-material></sec></body><back><ack><p>The authors would like to thank Pr. Faisal Fadlelmola and Dr. Amel Ghouila the chair and co-chair of the H3ABioNet Research and Tool Development Working Group for the follow up of the present project.</p><p>The H3ABioNet Consortium comprises the following current members:</p><p>Ezekiel Adebiyi, Jelili Oyelade, Victor Chukwudi Osamor, Itunuoluwa Isewon, Marion Adebiyi from Covenant University Bioinformatics Research (CUBRe) and Department of Computer and Information Sciences, Covenant University, Ota, Ogun State, Nigeria, P.M.B. 1023;</p><p>Oyekanmi Nash, Raphael Isokpehi from National Biotechnology Development Agency, Abuja, Nigeria 10099;</p><p>Raouf Alami from Centre National de Transfusion Sanguine, Rabat, Morocco 10100;</p><p>Fatima Gaboun from Institut National de Recherche Agronomique, Rabat, Morocco 10000;</p><p>Azeddine Ibrahimi from Faculté de Médecine et de Pharmacie de Rabat, Université Mohammed V Souissi, Rabat, Morocco 10100;</p><p>Ahmed Moussa from Abdelmalek Essaadi University, ENSA, Tangier, Morocco 90000;</p><p>Fouzia Radouani from Institut Pasteur du Maroc, Casablanca, Maroc, Morocco 20360;</p><p>Hassan Ghazal from University Mohammed First, Oujda, Morocco 60000;</p><p>Khalid Sadki from Faculty of Sciences of Rabat, University Mohammed V of Rabat, Rabat, Morocco 10000;</p><p>Fouad Seghrouchni from Institut National d'Hygiène, Rabat, Morocco 10090;</p><p>James Brandful from Noguchi Memorial Institute for Medical Research, University of Ghana, Ghana, LG;</p><p>Seydou Doumbia and Mamadou Wele from University of Sciences, Techniques and Technology of Bamako, Bamako, Mali BPE 3206;</p><p>Dean Everett, Maaike Alearts, Jennifer Cornick, Arox Kamng'ona from Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi, 3/Institute of Infection and Global Health, University of Liverpool, Liverpool L69 3BX, United Kingdom;</p><p>Faisal M. Fadlelmola, Azza E. Ahmed, Somia A. Mohammed and Rehab I. Ahmed from Centre for Bioinformatics and Systems Biology, Faculty of Science, University of Khartoum/Future University of Sudan, Khartoum, Sudan 11115;</p><p>Simani Gaseitsiwe from Botswana Harvard AIDS Institute Partnership, Gaborone, Botswana;</p><p>Scott Hazelhurst, Shaun Aron, Anmol Kiran, Benjamin Kumwenda, Phelelani Mpangase, Chisomo Msefula, Patrick Musicha from Sydney Brenner Institute for Molecular Bioscience, University of the Witwatersrand, Johannesburg, South Africa 2193;</p><p>Fourie Joubert from Department of Biochemistry, University of Pretoria, Pretoria, South Africa 0083;</p><p>Judit Kumuthini, Radhika S. Khetani and Mamana Mbiyavanga from Centre for Proteomic and Genomic Research, Cape Town, South Africa 7925;</p><p>Hugh Patterton University of the Free State, Bloemfontein, South Africa 9300;</p><p>Özlem Tastan Bishop, David Brown from Research Unit in Bioinformatics, Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, South Africa 6140;</p><p>Nicki Tiffin, Peter Van Heusden, Hocine Bendou, Alan Christoffels, Jean-Baka Domelevo Entfellner, Junaid Gamieldien, Mahjoubeh Jalali Sefid Dashti, Junaid Gamieldien from South African National Bioinformatics Institute/Medical Research Council of South Africa Bioinformatics Unit, University of the Western Cape, Cape Town, South Africa 7530;</p><p>Gustavo A. Salazar, Gerrit Botha, Emile Chimusa from Computational Biology Group, Department of Integrative Biomedical Sciences, Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa 7925;</p><p>Winston Hide, Shannan Ho Sui from Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA/Sheffield Institute for Translational Neuroscience, Department of Neuroscience, University of Sheffield, Sheffield S10 2HQ, United Kingdom;</p><p>Yasmina Jaufeerally Fakim, Zahra Mungloo-Dilmohammud and Shakuntala Baichoo from University of Mauritius, Reduit, Mauritius 80837;</p><p>C. Victor Jongeneel, Suresh Maslamoney, Dunfunk Mugutso, Victoria Nembaware from National Center for Supercomputing Applications and Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;</p><p>Samar Kassim from Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt 11566;</p><p>Ahmed Mansour Alzohairy from Genetics Department, Faculty of Agriculture, Zagazig University, Sharkia, Egypt 44519;</p><p>Jonathan Kayondo from Uganda Virus Research Institute, Entebbe, Uganda 31301;</p><p>Sylvester Lyantagaye from University of Dar es Salaam, Dar es Salaam, Tanzania, 73;</p><p>Daniel Masiga, Raphael Isokpehi, Benard Kulohoma and Anne Fischer from International Centre of Insect Physiology and Ecology, Nairobi, Kenya 00100;</p><p>Odile Ouwe Missi Oukem-Boyer from Centre de Recherche Medicale et Sanitaire, Niamey, Niger, BP 10887;</p><p>Ellis Owusu-Dabo Kumasi Centre for Collaborative Research in Tropical Medicine/Kwame Nkrumah University of Science and Technology, Kumasi, Ghana, PMB;</p><p>Nzovu Ulenga from Management and Development for Health, Dar es Salaam, Tanzania, 61;</p><p>Flora Elias Mlyango from University of Dar es Salaam, Dar es Salaam, Tanzania, 73;</p><p>Bruno Mmbando from Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania 00255;</p><p>Mohamed Alibi, Amel Ghouila and Oussema Souiai from Institute Pasteur of Tunis, Tunis, Tunisia 1002;</p><p>Gloria Rendon, Chris Fields, Dan Lapine and Liudmila Sergeevna Mainzer from National Center for Supercomputing Applications and Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;</p><p>Samson Pandam Salifu from Kumasi Centre for Collaborative Research in Tropical Medicine/Kwame Nkrumah University of Science and Technology, Kumasi, Ghana, PMB.</p></ack><ref-list><title>References</title><ref id="pone.0199461.ref001"><label>1</label><mixed-citation publication-type="other">Orphanet [Internet]. 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