Phytozome: a comparative platform for green plant genomics
Identifieur interne : 001078 ( Pmc/Corpus ); précédent : 001077; suivant : 001079Phytozome: a comparative platform for green plant genomics
Auteurs : David M. Goodstein ; Shengqiang Shu ; Russell Howson ; Rochak Neupane ; Richard D. Hayes ; Joni Fazo ; Therese Mitros ; William Dirks ; Uffe Hellsten ; Nicholas Putnam ; Daniel S. RokhsarSource :
- Nucleic Acids Research [ 0305-1048 ] ; 2011.
Abstract
The number of sequenced plant genomes and associated genomic resources is growing rapidly with the advent of both an increased focus on plant genomics from funding agencies, and the application of inexpensive next generation sequencing. To interact with this increasing body of data, we have developed Phytozome (
Url:
DOI: 10.1093/nar/gkr944
PubMed: 22110026
PubMed Central: 3245001
Links to Exploration step
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Phytozome: a comparative platform for green plant genomics</title><author><name sortKey="Goodstein, David M" sort="Goodstein, David M" uniqKey="Goodstein D" first="David M." last="Goodstein">David M. Goodstein</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Shu, Shengqiang" sort="Shu, Shengqiang" uniqKey="Shu S" first="Shengqiang" last="Shu">Shengqiang Shu</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Howson, Russell" sort="Howson, Russell" uniqKey="Howson R" first="Russell" last="Howson">Russell Howson</name><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author><author><name sortKey="Neupane, Rochak" sort="Neupane, Rochak" uniqKey="Neupane R" first="Rochak" last="Neupane">Rochak Neupane</name><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author><author><name sortKey="Hayes, Richard D" sort="Hayes, Richard D" uniqKey="Hayes R" first="Richard D." last="Hayes">Richard D. Hayes</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Fazo, Joni" sort="Fazo, Joni" uniqKey="Fazo J" first="Joni" last="Fazo">Joni Fazo</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Mitros, Therese" sort="Mitros, Therese" uniqKey="Mitros T" first="Therese" last="Mitros">Therese Mitros</name><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author><author><name sortKey="Dirks, William" sort="Dirks, William" uniqKey="Dirks W" first="William" last="Dirks">William Dirks</name><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author><author><name sortKey="Hellsten, Uffe" sort="Hellsten, Uffe" uniqKey="Hellsten U" first="Uffe" last="Hellsten">Uffe Hellsten</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Putnam, Nicholas" sort="Putnam, Nicholas" uniqKey="Putnam N" first="Nicholas" last="Putnam">Nicholas Putnam</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Rokhsar, Daniel S" sort="Rokhsar, Daniel S" uniqKey="Rokhsar D" first="Daniel S." last="Rokhsar">Daniel S. Rokhsar</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">22110026</idno><idno type="pmc">3245001</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3245001</idno><idno type="RBID">PMC:3245001</idno><idno type="doi">10.1093/nar/gkr944</idno><date when="2011">2011</date><idno type="wicri:Area/Pmc/Corpus">001078</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Phytozome: a comparative platform for green plant genomics</title><author><name sortKey="Goodstein, David M" sort="Goodstein, David M" uniqKey="Goodstein D" first="David M." last="Goodstein">David M. Goodstein</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Shu, Shengqiang" sort="Shu, Shengqiang" uniqKey="Shu S" first="Shengqiang" last="Shu">Shengqiang Shu</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Howson, Russell" sort="Howson, Russell" uniqKey="Howson R" first="Russell" last="Howson">Russell Howson</name><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author><author><name sortKey="Neupane, Rochak" sort="Neupane, Rochak" uniqKey="Neupane R" first="Rochak" last="Neupane">Rochak Neupane</name><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author><author><name sortKey="Hayes, Richard D" sort="Hayes, Richard D" uniqKey="Hayes R" first="Richard D." last="Hayes">Richard D. Hayes</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Fazo, Joni" sort="Fazo, Joni" uniqKey="Fazo J" first="Joni" last="Fazo">Joni Fazo</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Mitros, Therese" sort="Mitros, Therese" uniqKey="Mitros T" first="Therese" last="Mitros">Therese Mitros</name><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author><author><name sortKey="Dirks, William" sort="Dirks, William" uniqKey="Dirks W" first="William" last="Dirks">William Dirks</name><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author><author><name sortKey="Hellsten, Uffe" sort="Hellsten, Uffe" uniqKey="Hellsten U" first="Uffe" last="Hellsten">Uffe Hellsten</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Putnam, Nicholas" sort="Putnam, Nicholas" uniqKey="Putnam N" first="Nicholas" last="Putnam">Nicholas Putnam</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation></author><author><name sortKey="Rokhsar, Daniel S" sort="Rokhsar, Daniel S" uniqKey="Rokhsar D" first="Daniel S." last="Rokhsar">Daniel S. Rokhsar</name><affiliation><nlm:aff wicri:cut=" and" id="gkr944-AFF1">U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598</nlm:aff></affiliation><affiliation><nlm:aff id="gkr944-AFF1">The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</nlm:aff></affiliation></author></analytic><series><title level="j">Nucleic Acids Research</title><idno type="ISSN">0305-1048</idno><idno type="eISSN">1362-4962</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>The number of sequenced plant genomes and associated genomic resources is growing rapidly with the advent of both an increased focus on plant genomics from funding agencies, and the application of inexpensive next generation sequencing. To interact with this increasing body of data, we have developed Phytozome (<ext-link ext-link-type="uri" xlink:href="http://www.phytozome.net">http://www.phytozome.net</ext-link>), a comparative hub for plant genome and gene family data and analysis. Phytozome provides a view of the evolutionary history of every plant gene at the level of sequence, gene structure, gene family and genome organization, while at the same time providing access to the sequences and functional annotations of a growing number (currently 25) of complete plant genomes, including all the land plants and selected algae sequenced at the Joint Genome Institute, as well as selected species sequenced elsewhere. Through a comprehensive plant genome database and web portal, these data and analyses are available to the broader plant science research community, providing powerful comparative genomics tools that help to link model systems with other plants of economic and ecological importance.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Swarbreck, D" uniqKey="Swarbreck D">D Swarbreck</name></author><author><name sortKey="Wilks, C" uniqKey="Wilks C">C Wilks</name></author><author><name sortKey="Lamesch, P" uniqKey="Lamesch P">P Lamesch</name></author><author><name sortKey="Berardini, Tz" uniqKey="Berardini T">TZ Berardini</name></author><author><name sortKey="Garcia Hernandez, M" uniqKey="Garcia Hernandez M">M Garcia-Hernandez</name></author><author><name sortKey="Foerster, H" uniqKey="Foerster H">H Foerster</name></author><author><name sortKey="Li, D" uniqKey="Li D">D Li</name></author><author><name sortKey="Meyer, T" uniqKey="Meyer T">T 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Nucleic Acids Res</journal-id><journal-id journal-id-type="iso-abbrev">Nucleic Acids Res</journal-id><journal-id journal-id-type="publisher-id">nar</journal-id><journal-id journal-id-type="hwp">nar</journal-id><journal-title-group><journal-title>Nucleic Acids Research</journal-title></journal-title-group><issn pub-type="ppub">0305-1048</issn><issn pub-type="epub">1362-4962</issn><publisher><publisher-name>Oxford University Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">22110026</article-id><article-id pub-id-type="pmc">3245001</article-id><article-id pub-id-type="doi">10.1093/nar/gkr944</article-id><article-id pub-id-type="publisher-id">gkr944</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Phytozome: a comparative platform for green plant genomics</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Goodstein</surname><given-names>David M.</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>1</sup></xref><xref ref-type="corresp" rid="gkr944-COR1">*</xref></contrib><contrib contrib-type="author"><name><surname>Shu</surname><given-names>Shengqiang</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Howson</surname><given-names>Russell</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Neupane</surname><given-names>Rochak</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Hayes</surname><given-names>Richard D.</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Fazo</surname><given-names>Joni</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Mitros</surname><given-names>Therese</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Dirks</surname><given-names>William</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Hellsten</surname><given-names>Uffe</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Putnam</surname><given-names>Nicholas </given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Rokhsar</surname><given-names>Daniel S.</given-names></name><xref ref-type="aff" rid="gkr944-AFF1"><sup>1</sup></xref><xref ref-type="aff" rid="gkr944-AFF1"><sup>2</sup></xref></contrib></contrib-group><aff id="gkr944-AFF1"><sup>1</sup>U.S. Department of Energy, Joint Genome Institute, Walnut Creek, CA 94598 and<sup>2</sup>The Center for Integrative Genomics, University of California, Berkeley, California 94720, USA</aff><author-notes><corresp id="gkr944-COR1">*To whom correspondence should be addressed. Tel: <phone>+415 200 6110</phone>; Fax: <fax>+925 927 2552</fax>; E-mail: <email>dmgoodstein@lbl.gov</email></corresp></author-notes><pub-date pub-type="ppub"><month>1</month><year>2012</year></pub-date><pub-date pub-type="epub"><day>22</day><month>11</month><year>2011</year></pub-date><pub-date pub-type="pmc-release"><day>22</day><month>11</month><year>2011</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on the
<volume>40</volume><issue>Database issue</issue><issue-title>Database issue</issue-title><fpage>D1178</fpage><lpage>D1186</lpage><history><date date-type="received"><day>7</day><month>9</month><year>2011</year></date><date date-type="accepted"><day>12</day><month>10</month><year>2011</year></date></history><permissions><copyright-statement>Published by Oxford University Press 2011.</copyright-statement><copyright-year>2011</copyright-year><license license-type="creative-commons" xlink:href="http://creativecommons.org/licenses/by-nc/3.0"><license-p><pmc-comment>CREATIVE COMMONS</pmc-comment>This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc/3.0">http://creativecommons.org/licenses/by-nc/3.0</ext-link>), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p>The number of sequenced plant genomes and associated genomic resources is growing rapidly with the advent of both an increased focus on plant genomics from funding agencies, and the application of inexpensive next generation sequencing. To interact with this increasing body of data, we have developed Phytozome (<ext-link ext-link-type="uri" xlink:href="http://www.phytozome.net">http://www.phytozome.net</ext-link>), a comparative hub for plant genome and gene family data and analysis. Phytozome provides a view of the evolutionary history of every plant gene at the level of sequence, gene structure, gene family and genome organization, while at the same time providing access to the sequences and functional annotations of a growing number (currently 25) of complete plant genomes, including all the land plants and selected algae sequenced at the Joint Genome Institute, as well as selected species sequenced elsewhere. Through a comprehensive plant genome database and web portal, these data and analyses are available to the broader plant science research community, providing powerful comparative genomics tools that help to link model systems with other plants of economic and ecological importance.</p></abstract><counts><page-count count="9"></page-count></counts></article-meta></front><body><sec sec-type="intro"><title>INTRODUCTION</title><p>Plant genome databases have grown up around different plant clades [e.g. TAIR for <italic>Arabidopsis</italic> (<xref rid="gkr944-B1" ref-type="bibr">1</xref>), Gramene for grasses (<xref rid="gkr944-B2" ref-type="bibr">2</xref>), SGN for Solanaceae (<xref rid="gkr944-B3" ref-type="bibr">3</xref>), GDR for Rosaceae (<xref rid="gkr944-B4" ref-type="bibr">4</xref>), LIS for legumes (<xref rid="gkr944-B5" ref-type="bibr">5</xref>)]. This is in part due to the longstanding investment in plant genetic and physical mapping resources and the focus of breeding programs in different agricultural crops. Comparative genomic databases that sample widely across the Viridiplantae [Phytozome, GreenPhylDB (<xref rid="gkr944-B6" ref-type="bibr">6</xref>), Plaza (<xref rid="gkr944-B7" ref-type="bibr">7</xref>), PlantGDB (<xref rid="gkr944-B8" ref-type="bibr">8</xref>)] are a more recent development. These databases and associated web portals provide, at a minimum, a uniform set of tools and automated analyses across a wider range of plant genomes. In addition, those focused on green plant comparative genomics (GreenPhylDB, Plaza and Phytozome) provide putative gene families (groups of extant genes descended from a common ancestral gene) calculated at one or more speciation nodes in the plant tree of life, spanning most if not all hosted species, as well as additional gene-centric and genome-centric comparative tools. Their goal is to provide a platform for both genome-informed investigations of plant evolution, as well as a framework for transferring functional information from model plants to plants of agricultural, industrial and environmental importance.</p><p>Phytozome ((<ext-link ext-link-type="uri" xlink:href="http://www.phytozome.net">http://www.phytozome.net</ext-link>), first released in 2008, provides a centralized hub that enables users with varying degrees of computational sophistication to access annotated plant gene families, to navigate the evolutionary history of gene families and individual genes, to examine plant genes in their genomic context, to assign putative function to uncharacterized user sequences and provides uniform access to plant genomics data sets consisting of complete genomes, gene and related (e.g. homologous) sequences and alignments, gene functional information and gene families, either in bulk or as the result of on-the-fly complex queries. The Phytozome web portal integrates a number of widely-used open source components [Lucene, GBrowse (<xref rid="gkr944-B9" ref-type="bibr">9</xref>), Jalview (<xref rid="gkr944-B10" ref-type="bibr">10</xref>), BioMart (<xref rid="gkr944-B11" ref-type="bibr">11</xref>), mView (<xref rid="gkr944-B12" ref-type="bibr">12</xref>) and pygr] with custom visualization code for gene family search, inspection and evaluation.</p></sec><sec><title>DATA SOURCES AND STANDARD ANALYSES</title><p>The v7.0 release of Phytozome contains data and analyses for 25 plant genomes, 18 of which were sequenced, assembled and partially or completely annotated at the JGI (<xref ref-type="table" rid="gkr944-T1">Table 1</xref>). The gene-calling procedure for each JGI genome is described in detail in the associated genome publication, but a general overview of the JGI Plant Genome Annotation workflow is provided in <ext-link ext-link-type="uri" xlink:href="http://nar.oxfordjournals.org/cgi/content/full/gkr944/DC1">Supplementary Methods S1</ext-link>. For non-JGI genomes and annotations, assembled genome sequences and gene, transcript and peptide information is obtained in GFF or FASTA format, and subjected to consistency checking.
<table-wrap id="gkr944-T1" position="float"><label>Table 1.</label><caption><p>The 25 completed plant genomes in version 7 of Phytozome</p></caption><table frame="hsides" rules="groups"><thead align="left"><tr><th rowspan="1" colspan="1">Organism</th><th rowspan="1" colspan="1">Common name</th><th rowspan="1" colspan="1">Version</th></tr></thead><tbody align="left"><tr><td rowspan="1" colspan="1"><italic>Aquilegia coerulea</italic></td><td rowspan="1" colspan="1">Colorado blue columbine</td><td rowspan="1" colspan="1">JGI v1.0</td></tr><tr><td rowspan="1" colspan="1"><italic>Arabidopsis lyrata</italic></td><td rowspan="1" colspan="1">Lyre-leaved rock cress</td><td rowspan="1" colspan="1">JGI v1.0 (<xref rid="gkr944-B13" ref-type="bibr">13</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Arabidopsis thaliana</italic></td><td rowspan="1" colspan="1">Thale cress</td><td rowspan="1" colspan="1">TAIR v10 (<xref rid="gkr944-B1" ref-type="bibr">1</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Brachypodium distachyon</italic></td><td rowspan="1" colspan="1">Purple false brome</td><td rowspan="1" colspan="1">JGI /MIPS v1.0 (<xref rid="gkr944-B14" ref-type="bibr">14</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Carica papaya</italic></td><td rowspan="1" colspan="1">Papaya</td><td rowspan="1" colspan="1">ASGPB release of 2007 (<xref rid="gkr944-B15" ref-type="bibr">15</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Chlamydomonas reinhardtii</italic></td><td rowspan="1" colspan="1">Green alga</td><td rowspan="1" colspan="1">JGI assembly v4 with Augustus update 10.2 annotation (<xref rid="gkr944-B16" ref-type="bibr">16</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Citrus clementina</italic></td><td rowspan="1" colspan="1">Clementine</td><td rowspan="1" colspan="1">JGI v0.9</td></tr><tr><td rowspan="1" colspan="1"><italic>Citrus sinensis</italic></td><td rowspan="1" colspan="1">Sweet orange</td><td rowspan="1" colspan="1">JGI/U Florida v1 assembly and v1.1 annotation</td></tr><tr><td rowspan="1" colspan="1"><italic>Cucumis sativus</italic></td><td rowspan="1" colspan="1">Cucumber</td><td rowspan="1" colspan="1">Roche 454-XLR assembly and JGI v1.0 annotation</td></tr><tr><td rowspan="1" colspan="1"><italic>Eucalyptus grandis</italic></td><td rowspan="1" colspan="1">Eucalyptus</td><td rowspan="1" colspan="1">JGI v1.0</td></tr><tr><td rowspan="1" colspan="1"><italic>Glycine max</italic></td><td rowspan="1" colspan="1">Soybean</td><td rowspan="1" colspan="1">JGI Glyma1 assembly and Glyma 1.0 annotation (<xref rid="gkr944-B17" ref-type="bibr">17</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Manihot esculenta</italic></td><td rowspan="1" colspan="1">Cassava</td><td rowspan="1" colspan="1">JGI/Roche/U. Arizona v4 assembly and v4.1 annotation</td></tr><tr><td rowspan="1" colspan="1"><italic>Medicago truncatula</italic></td><td rowspan="1" colspan="1">Barrel medic</td><td rowspan="1" colspan="1">Medicago Genome Sequence Consortium version Mt3.0</td></tr><tr><td rowspan="1" colspan="1"><italic>Mimulus guttatus</italic></td><td rowspan="1" colspan="1">Monkey flower</td><td rowspan="1" colspan="1">JGI v1.0 release of strain IM62</td></tr><tr><td rowspan="1" colspan="1"><italic>Oryza sativa</italic></td><td rowspan="1" colspan="1">Rice</td><td rowspan="1" colspan="1">MSU Release 6.0 (<xref rid="gkr944-B18" ref-type="bibr">18</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Physcomitrella patens</italic></td><td rowspan="1" colspan="1">Moss</td><td rowspan="1" colspan="1">JGI assembly v1.1 and COSMOSS annotation v1.6 (<xref rid="gkr944-B19" ref-type="bibr">19</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Populus trichocarpa</italic></td><td rowspan="1" colspan="1">Poplar</td><td rowspan="1" colspan="1">JGI assembly v2.0, annotation v2.2 (<xref rid="gkr944-B20" ref-type="bibr">20</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Prunus persica</italic></td><td rowspan="1" colspan="1">Peach</td><td rowspan="1" colspan="1">JGI v1.0</td></tr><tr><td rowspan="1" colspan="1"><italic>Ricinus communis</italic></td><td rowspan="1" colspan="1">Castor bean</td><td rowspan="1" colspan="1">TIGR Release 0.1</td></tr><tr><td rowspan="1" colspan="1"><italic>Selaginella moellendorffii</italic></td><td rowspan="1" colspan="1">Spikemoss</td><td rowspan="1" colspan="1">JGI v1.0 (<xref rid="gkr944-B21" ref-type="bibr">21</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Setaria italica</italic></td><td rowspan="1" colspan="1">Foxtail millet</td><td rowspan="1" colspan="1">JGI assembly v2.0, annotation version 2.1</td></tr><tr><td rowspan="1" colspan="1"><italic>Sorghum bicolor</italic></td><td rowspan="1" colspan="1">Sweet sorghum</td><td rowspan="1" colspan="1">JGI v1.0 assembly, MIPS/PASA Sbi1.4 models (<xref rid="gkr944-B22" ref-type="bibr">22</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Vitis vinifera</italic></td><td rowspan="1" colspan="1">Grapevine</td><td rowspan="1" colspan="1">Genoscope March 2010 annotation on 12X assembly (<xref rid="gkr944-B23" ref-type="bibr">23</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Volvox carteri</italic></td><td rowspan="1" colspan="1">Volvox</td><td rowspan="1" colspan="1">JGI v1.0 (<xref rid="gkr944-B24" ref-type="bibr">24</xref>)</td></tr><tr><td rowspan="1" colspan="1"><italic>Zea mays</italic></td><td rowspan="1" colspan="1">Maize</td><td rowspan="1" colspan="1">Unfiltered protein coding models from Maizesequence.org release 5a.59 (<xref rid="gkr944-B25" ref-type="bibr">25</xref>)</td></tr></tbody></table><table-wrap-foot><fn id="gkr944-TF1"><p>For published genomes, references are included in the version column.</p></fn></table-wrap-foot></table-wrap></p><p>For non-JGI genomes, any gene symbols, database cross references, deflines and experimentally-supported functional annotations (e.g. GO, EC) are also obtained. In the interests of uniformity of functional annotation, automatically generated functional annotations of non-JGI genomes are not retained. Protein-coding genes from both JGI and non-JGI genomes are then assigned PFAM domains (<xref rid="gkr944-B26" ref-type="bibr">26</xref>), KEGG enzyme classification and KEGG Orthology assignment (<xref rid="gkr944-B27" ref-type="bibr">27</xref>), KOG assignment (<xref rid="gkr944-B28" ref-type="bibr">28</xref>) and Panther classification (<xref rid="gkr944-B29" ref-type="bibr">29</xref>). Gene Ontology (GO) (<xref rid="gkr944-B30" ref-type="bibr">30</xref>) assignments are made via pfam2GO mapping (<xref rid="gkr944-B31" ref-type="bibr">31</xref>). All gene models and associated annotations are then loaded into Phytozome's mySQL database.</p><p>Same-species and near-species EST assemblies and Phytozome plant peptides are aligned against each genome. Each genome also undergoes whole genome alignment against a clade-informative subset of the other Phytozome genomes using the VISTA pipeline (<xref rid="gkr944-B32" ref-type="bibr">32</xref>). Gene and alignment tracks, as well as VISTA-derived genome-wide pairwise DNA alignments are all accessible from Phytozome's GBrowse genome browser.</p></sec><sec><title>GENE FAMILY CONSTRUCTION</title><p>Large scale, automated gene family construction is typically based on distance methods [Phytome (<xref rid="gkr944-B33" ref-type="bibr">33</xref>), PlantTribes (<xref rid="gkr944-B34" ref-type="bibr">34</xref>), InParanoid (<xref rid="gkr944-B35" ref-type="bibr">35</xref>), OrthoMCL (<xref rid="gkr944-B36" ref-type="bibr">36</xref>)] or, less frequently, distance-plus-character methods [OrthologID (<xref rid="gkr944-B37" ref-type="bibr">37</xref>), TreeFam (<xref rid="gkr944-B38" ref-type="bibr">38</xref>)], using a single peptide per locus in each genome under consideration. These distance-based methods can be broadly separated into two categories: those that implicitly (OrthoMCL) or explicitly (InParanoid) take into account the Mutual Best Hit (MBH) (<xref rid="gkr944-B39" ref-type="bibr">39</xref>) relationship between putatively orthologous sequences and its role in setting a threshold for paralog accumulation (<ext-link ext-link-type="uri" xlink:href="http://nar.oxfordjournals.org/cgi/content/full/gkr944/DC1">Supplementary Methods S2</ext-link>), and those that do not (Phytome, PlantTribes).</p><p>Distance-based methods have the advantage of being generally fast and scalable. Their main disadvantage lies in their reliance on a single score to characterize the evolutionary divergence of sequences, which becomes more problematic when considering species with an ancient divergence (in which case BLASTP scores tend to lose their resolving power, leading to the either the accumulation of unrelated, weakly aligning sequences into families at low significance thresholds, or the exclusion of distant but true homologs at higher significance thresholds).</p><p>Distance-plus-character-based methods use distance scores and a simple threshold to build an initial set of gene proto-families, all of whose members are more similar to each other than the threshold (e.g. OrthologID currently employs an <italic>E</italic>-value threshold of 1<italic>e</italic> – 20). The members of each family are then included in a multiple sequence alignment (MSA), and phylogenetic trees are constructed based on discriminating residues (characters) in the MSA. The actual gene families correspond to the various monophyletic nodes found in the resulting trees. Phylogenetic methods are traditionally thought to be more accurate, especially when looking at anciently diverged species. However, recent work (<xref rid="gkr944-B40" ref-type="bibr">40</xref>) on <italic>Drosophila</italic> and fungal species that span evolutionary distances comparable to the eudicots, has shown that a wide range of tree-building methods fail >50% of the time to produce the correct tree topology for even simple gene families, indicating the need for caution when making ortholog/paralog assignments based on gene and species tree reconciliation.</p><p>Whatever construction method is chosen, each gene family and its associated phylogenetic tree represents a hypothesis of the evolutionary history of a set of extant genes, presumed to be descendants of a single, unobservable ancestral gene. Descendants arise either via speciation (giving rise to orthologous descendants) or local or larger scale duplication events (giving rise to paralogous descendants). As orthologs are assumed to more likely share a common biological function, while paralogs are subject to both neo- and subfunctionalization (<xref rid="gkr944-B41" ref-type="bibr">41</xref>,<xref rid="gkr944-B42" ref-type="bibr">42</xref>), the high confidence identification of orthologs allows for the transfer of functional information from well-studied, tractable model systems (e.g. <italic>Arabidopsis</italic> and <italic>Brachypodium</italic>) to other economically or otherwise relevant plants.</p><p>Gene family construction in Phytozome uses a distance-based approach similar to the PhiGs method (<xref rid="gkr944-B43" ref-type="bibr">43</xref>), the initial proto-family creation step used in TreeFam, with several modifications (<ext-link ext-link-type="uri" xlink:href="http://nar.oxfordjournals.org/cgi/content/full/gkr944/DC1">Supplementary Methods S2</ext-link>). Family construction is restricted initially to a subset of core genomes, which are assumed to have relatively stable assemblies and complete structural annotations, though in some cases genomes with draft assemblies and annotations are used if the species in question is the sole representative of its clade (e.g. <italic>Selaginella, Physcomitrella, Mimulus</italic>). Using the assumed species tree, gene families are constructed at each evolutionary node, starting from the crown nodes [as in (<xref rid="gkr944-B44" ref-type="bibr">44</xref>)] and moving backward in evolutionary time. At each bifurcating parent node, pairs of gene families from the two daughter nodes are combined into a parent family if they are joined by a cross-node MBH. Remaining families from the daughter nodes will be added to a parent family as paralogs if they have a hit to the parent that is stronger than the parent's best outgroup hit. This process is repeated down to the root node. MSAs from MUSCLE (<xref rid="gkr944-B45" ref-type="bibr">45</xref>) and Hidden Markov Model (HMM) profiles from HMMER3 (<xref rid="gkr944-B46" ref-type="bibr">46</xref>) are created for each core family. These profiles are used to ‘pledge’ peptides from non-core genomes into existing core families using HMMScan (<xref rid="gkr944-B46" ref-type="bibr">46</xref>); they can also join core families if they are linked by a MBH. Non-core members can pledge to multiple families at a given node; thus the strict nesting of gene families is true for the core members only.</p><p><xref ref-type="fig" rid="gkr944-F1">Figure 1</xref> shows a typical gene family view, with the basis for each gene's membership in the family displayed in the leftmost column. A view of this family's evolutionary history (<xref ref-type="fig" rid="gkr944-F2">Figure 2</xref>) shows the hierarchical nesting of the core families.
<fig id="gkr944-F1" position="float"><label>Figure 1.</label><caption><p>Default view of the Gene Family page for a 17 member core eudicot family. Members are listed according to their order in the tree on the Phytozome home page. The membership class of each gene is indicated in the leftmost column (<ext-link ext-link-type="uri" xlink:href="http://nar.oxfordjournals.org/cgi/content/full/gkr944/DC1">Supplementary Methods S2</ext-link>). For each member, Gene Page and GBrowse links are provided, as well as links to external databases (if these exist), aliases, symbols and deflines. The synteny view in the right column shows the five upstream and five downstream neighbors of each family member (who are rendered as gray icons in the middle of each synteny row). Each syntenic segment is oriented to render family members in the same orientation (consistent with their presumed descent from a common ancestor). Gene icons sharing the same (non-white) color are all members of the same gene family at this node; this can provide syntenic support for the hypothesis of a common ancestor for family members.</p></caption><graphic xlink:href="gkr944f1"></graphic></fig><fig id="gkr944-F2" position="float"><label>Figure 2.</label><caption><p>Family History view of the gene family in <xref ref-type="fig" rid="gkr944-F1">Figure 1</xref>. All the descendants and ancestors of this core eudicot family (which is highlighted) are visible in the history view. The strict nesting of families is observed, though one needs to remember that one of the <italic>Eucalyptus</italic> genes in this core eudicot family is an incomplete pledge (<ext-link ext-link-type="uri" xlink:href="http://nar.oxfordjournals.org/cgi/content/full/gkr944/DC1">Supplementary Methods S2</ext-link>), and is not present in the deeper Embryophyte and Viridiplantae ancestors.</p></caption><graphic xlink:href="gkr944f2"></graphic></fig></p><p>The use of relatively strict significance and coverage thresholds, as well as an insistence on MBH relationships rather than simply strong similarity as the basis for seeding gene families, is intended to prevent merely similar gene families from coalescing at an inappropriate node in the tree. It also, however, biases Phytozome families towards underclustering. For this reason Phytozome includes a number of search and navigation tools, described below, to quickly bring together gene families that share overall sequence similarity or functional annotation.</p></sec><sec><title>PHYTOZOME TOOLS AND VIEWS</title><sec><title>Text and sequence search</title><p>Genes and gene families can be retrieved from Phytozome by both keyword and sequence similarity searches. BLAST and BLAT searches of organism genomes, and BLAST searches of proteomes and gene family consensus sequences, can be used to find the genomic regions, gene transcripts, peptides and gene families most similar to a given query sequence. All gene and gene family attributes such as names, symbols, synonyms, external database identifiers, deflines and functional annotation ids (e.g. PFAM00071, E.C. 1.1.1.95) are searchable, and gene families automatically inherit the attributes of their members, making it straightforward to retrieve a family of related but mostly uncurated genes as long as at least one family member is well annotated. Search can be restricted to gene families at a particular evolutionary node, and to families matching particular absence/presence phylogenetic profiles. One can also search the database of functional annotations (e.g. keywords from the descriptions of PFAM, GO, KEGG, KOG, Panther), which retrieves the set of all matching functional identifiers, and then automatically performs a second search for families marked as containing those functions.</p><p>All genes and gene families found via keyword or sequence similarity searches can be viewed individually, as described below, or first combined ‘on the fly’ to produce composite families, before being viewed and analyzed with the same tools used for individual families.</p></sec><sec><title>Gene family and gene page views</title><p>The Gene Family view (<xref ref-type="fig" rid="gkr944-F1">Figure 1</xref>) provides the user with detailed information on each family and its constituent members, organized to highlight shared attributes. The default ‘Genes in this family’ tab displays individual family members, grouped by species and includes each member's source identifier (hyperlinked to the appropriate source database), aliases, synonyms and gene symbols, deflines (where available) and a graphical view of each member's local syntenic environment. A provisional family name is provided, as well as a membership ‘fingerprint’ (member count for all species present at this node), and family-level KOG and KEGG-Orthology classification. The syntenic display can be replaced by a PFAM domain or gene structure (exon/intron) display. For each family member, links are provided to both a GBrowse view (<xref ref-type="fig" rid="gkr944-F3">Figure 3</xref>) of each gene in its genomic context, and a ‘Gene Page’ (<xref ref-type="fig" rid="gkr944-F4">Figure 4</xref>).
<fig id="gkr944-F3" position="float"><label>Figure 3.</label><caption><p>GBrowse view of the local genomic context of the poplar gene from the family in <xref ref-type="fig" rid="gkr944-F1">Figure 1</xref>. Primary and alternative transcripts (if present), assembled EST data and related plant peptides are shown aligned against the genome. Not shown are tracks of repetitive regions, GC content and the alignment of ESTs from related species. Interspecies whole genome alignments, displayed in the VISTA tracks, reveal the tendency towards strong genomic sequence conservation in coding regions (which are under selective pressure), which weakens as one considers more distantly related species (e.g. rice-poplar versus the more closely related eucalyptus-poplar VISTA alignments). Displayed gene models are hyperlinked to their respective gene pages.</p></caption><graphic xlink:href="gkr944f3"></graphic></fig><fig id="gkr944-F4" position="float"><label>Figure 4.</label><caption><p>Default view of the Gene Page for the <italic>Arabidopsis thaliana</italic> gene in the family of <xref ref-type="fig" rid="gkr944-F1">Figure 1</xref>, showing primary transcript info, functional annotations and simplified genomic context. This locus has an alternative transcript (which appears to differ primarily in its 5′-UTR). Note the strong splicing support provided by the BLATX aligned <italic>Arabidopsis lyrata</italic> peptide (which in actuality is also a member of this family).</p></caption><graphic xlink:href="gkr944f4"></graphic></fig></p><p>The family page is divided into a set of lower and upper tabs, roughly corresponding to ‘information’ and ‘actions’, respectively. The lower row helps users explore the consistency and evolutionary history of the family. The ‘Functional Annotation’ tab lists all the functional and domain annotations (e.g. PFAM, Panther, GO, KEGG, KEGG Orthology) assigned to family members, broken down by organism. Functional annotations present in all family members are highlighted. The ‘MSA’ tab displays a pre-computed MUSCLE peptide alignment of all family members, which is downloadable. The family's evolutionary history can be viewed in the ‘Family History’ tab, where all families that are parents of, or derived from, the current family are listed. From the upper row of tabs, ‘Find related families’ provides a number of methods for identifying families similar to the current one: by family consensus sequence similarity, by shared functional annotation, or by shared gene membership. This is quite useful when looking for related subfamilies, or verifying that a particular combination of domains is unique to a given family. ‘Align family members’ forwards family member coding or peptide sequences directly to the Jalview tool, where MSAs can be created and edited, and subsequently used to construct phylogenetic trees. ‘Get Data’ provides access to the BioMart data query tool for this family, while the family page display can be customized on the ‘Display options’ tab.</p><p>The Gene Page (<xref ref-type="fig" rid="gkr944-F4">Figure 4</xref>), in addition to showing single gene functional annotations and evolutionary history, includes links to alternatively spliced transcripts (if they exist), a simplified view of the gene in its genomic context (showing alternatively spliced transcripts and peptide homology tracks), direct access to genomic, transcript, coding and peptide sequences associated with this gene locus (color-coded to indicate exon/intron and UTR boundaries), and a graphical view of all other Phytozome peptides aligned [via dual affine Smith-Waterman (<xref rid="gkr944-B47" ref-type="bibr">47</xref>)] against this gene's peptide.</p><p>Genome-centric views are provided by GBrowse (<xref ref-type="fig" rid="gkr944-F3">Figure 3</xref>) for all 25 genomes currently included in Phytozome. The browsers can be accessed directly from the Phytozome home page, from individual member gene links on the Gene Family or Gene page, and from the BLAST/BLAT results page for searches performed against one of the genome target databases. In the latter two cases, a zoomed-in view of the genomic region containing the selected gene (or BLAST hit) is displayed. Each browser typically displays a gene prediction track (primary and alternatively spliced transcripts), a track of homologous peptides from related species aligned against the genome, supporting EST (or EST assemblies) and one or more VISTA tracks identifying regions of this genome that are syntenic with other plant genomes included in Phytozme. All gene features are hyperlinked to their respective Gene Page, while the VISTA tracks are linked to the corresponding genomic regions in the VISTA browser.</p></sec></sec><sec><title>DATA ACCESS</title><p>For each genome hosted at Phytozome, bulk data files are available that contain genome assembly sequence, gene structure GFF3, transcript, coding and peptide sequence in FASTA format and general annotation information (PFAM, Panther, KOG, KEGG, best rice and <italic>Arabidopsis</italic> homologs). For JGI genomes, we also provide repeat-masked genome assemblies, as well as supporting annotation data (e.g. the PASA EST assemblies used in gene calling).</p><p>Customized data sets consisting of gene or gene family sequences and annotations can be constructed using Phytozome's implementation of BioMart, where users can choose detailed data filters, attributes and output formats. BioMart can be accessed from the ‘Get Data’ tab on a gene family page (in which case the data is, by default, initially restricted to that gene family), or directly from the Phytozome menu. It is also available at the BioMart central portal, <ext-link ext-link-type="uri" xlink:href="http://www.biomart.org">http://www.biomart.org</ext-link>.</p></sec><sec><title>PHYTOZOME SOFTWARE IMPLEMENTATION</title><p>We have made extensive reuse of available databases, software tools and data formats in our implementation of Phytozome. The Phytozome website is built on a LAMPJ stack (Linux, Apache, mySQL, php/Perl and Java). Open source visualization components of Phytozome include: Gbrowse (<xref rid="gkr944-B9" ref-type="bibr">9</xref>), the Generic Genome Browser, from the GMOD project, for the visualization of features in their genomic context; Jalview (<xref rid="gkr944-B10" ref-type="bibr">10</xref>), a multiple alignment viewer and editor, for the creation, detailed inspection and modification of MSAs and phylogenetic trees; BioMart (<xref rid="gkr944-B11" ref-type="bibr">11</xref>), to enable query-based downloads of bulk data on gene families and genome annotations; BioPerl (<xref rid="gkr944-B48" ref-type="bibr">48</xref>), for the parsing and formatting of genomic data and BLAST results; and mView (<xref rid="gkr944-B12" ref-type="bibr">12</xref>), for the visualization of MSAs. The search system is based on the Lucene search engine (<ext-link ext-link-type="uri" xlink:href="http://lucene.apache.org/">http://lucene.apache.org/</ext-link>).</p></sec><sec><title>FUTURE PLANS</title><p>Phytozome content will continue to be updated at least annually, with new and updated genomes typically added in January and new feature sets released quarterly. Current plans for the January 2012 (v8) release include updates to poplar, soybean, brachypodium, maize and medicago, the first-time inclusion of the JGI genomes phaseolus (common bean) and <italic>Capsella rubella</italic> (an <italic>Arabidopsis</italic> comparator), and the externally contributed apple (<xref rid="gkr944-B49" ref-type="bibr">49</xref>), strawberry (<xref rid="gkr944-B50" ref-type="bibr">50</xref>) and potato (<xref rid="gkr944-B51" ref-type="bibr">51</xref>) genomes. Version 8 is also expected to include genomic variation data (SNPs and structural variants) from the JGI and elsewhere, and expression data associated with the JGI Gene Atlas projects. Phytozome is also in the final stages of licensing for distribution to end users. We expect that the entire database and software infrastructure will be available for download by the end of 2011.</p></sec><sec><title>SUPPLEMENTARY DATA</title><p><ext-link ext-link-type="uri" xlink:href="http://nar.oxfordjournals.org/cgi/content/full/gkr944/DC1">Supplementary Data</ext-link> are available at NAR Online: Supplementary methods S1–S2, Supplementary references [52–57].</p></sec><sec><title>FUNDING</title><p>This work was performed at the <funding-source>U.S. Department of Energy Joint Genome Institute</funding-source>, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. <award-id>DE-AC02-05CH11231</award-id>. Additional funding was provided by the <funding-source>Gordon and Betty Moore Foundation</funding-source>. Funding for open access charge: <funding-source>Office of Science of the U.S. Department of Energy</funding-source> under Contract No. <award-id>DE-AC02-05CH11231</award-id>.</p><p><italic>Conflict of interest statement</italic>. 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