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Genomic investigation of α‐synuclein multiplication and parkinsonism

Identifieur interne : 000322 ( Main/Corpus ); précédent : 000321; suivant : 000323

Genomic investigation of α‐synuclein multiplication and parkinsonism

Auteurs : Owen A. Ross ; Adam T. Braithwaite ; Lisa M. Skipper ; Jennifer Kachergus ; Mary M. Hulihan ; Frank A. Middleton ; Kenya Nishioka ; Julia Fuchs ; Thomas Gasser ; Demetrius M. Maraganore ; Charles H. Adler ; Lydie Larvor ; Marie-Christine Chartier-Harlin ; Christer Nilsson ; J. William Langston ; Katrina Gwinn ; Nobutaka Hattori ; Matthew J. Farrer

Source :

RBID : ISTEX:78C1348524C06C8DBBAD41A8533A9623D7595BC7

Abstract

Objective: Copy number variation is a common polymorphic phenomenon within the human genome. Although the majority of these events are non‐deleterious they can also be highly pathogenic. Herein we characterize five families with parkinsonism that have been identified to harbor multiplication of the chromosomal 4q21 locus containing the α‐synuclein gene (SNCA). Methods: A methodological approach using fluorescent in situ hybridization and Affymetrix (Santa Clara, CA) 250K SNP microarrays was used to characterize the multiplication in each family and to identify the genes encoded within the region. The telomeric and centromeric breakpoints of each family were further narrowed using semiquantitative polymerase chain reaction with microsatellite markers and then screened for transposable repeat elements. Results: The severity of clinical presentation is correlated with SNCA dosage and does not appear to be overtly affected by the presence of other genes in the multiplicated region. With the exception of the Lister kindred, in each family the multiplication event appears de novo. The type and position of Alu/LINE repeats are also different at each breakpoint. Microsatellite analysis demonstrates two genomic mechanisms are responsible for chromosome 4q21 multiplications, including both SNCA duplication and recombination. Interpretation: SNCA dosage is responsible for parkinsonism, autonomic dysfunction, and dementia observed within each family. We hypothesize dysregulated expression of wild‐type α‐synuclein results in parkinsonism and may explain the recent association of common SNCA variants in sporadic Parkinson's disease. SNCA genomic duplication results from intraallelic (segmental duplication) or interallelic recombination with unequal crossing over, whereas both mechanisms appear to be required for genomic SNCA triplication. Ann Neurol 2008

Url:
DOI: 10.1002/ana.21380

Links to Exploration step

ISTEX:78C1348524C06C8DBBAD41A8533A9623D7595BC7

Le document en format XML

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<name sortKey="Chartier Arlin, Marie Hristine" sort="Chartier Arlin, Marie Hristine" uniqKey="Chartier Arlin M" first="Marie-Christine" last="Chartier-Harlin">Marie-Christine Chartier-Harlin</name>
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<div type="abstract" xml:lang="en">Objective: Copy number variation is a common polymorphic phenomenon within the human genome. Although the majority of these events are non‐deleterious they can also be highly pathogenic. Herein we characterize five families with parkinsonism that have been identified to harbor multiplication of the chromosomal 4q21 locus containing the α‐synuclein gene (SNCA). Methods: A methodological approach using fluorescent in situ hybridization and Affymetrix (Santa Clara, CA) 250K SNP microarrays was used to characterize the multiplication in each family and to identify the genes encoded within the region. The telomeric and centromeric breakpoints of each family were further narrowed using semiquantitative polymerase chain reaction with microsatellite markers and then screened for transposable repeat elements. Results: The severity of clinical presentation is correlated with SNCA dosage and does not appear to be overtly affected by the presence of other genes in the multiplicated region. With the exception of the Lister kindred, in each family the multiplication event appears de novo. The type and position of Alu/LINE repeats are also different at each breakpoint. Microsatellite analysis demonstrates two genomic mechanisms are responsible for chromosome 4q21 multiplications, including both SNCA duplication and recombination. Interpretation: SNCA dosage is responsible for parkinsonism, autonomic dysfunction, and dementia observed within each family. We hypothesize dysregulated expression of wild‐type α‐synuclein results in parkinsonism and may explain the recent association of common SNCA variants in sporadic Parkinson's disease. SNCA genomic duplication results from intraallelic (segmental duplication) or interallelic recombination with unequal crossing over, whereas both mechanisms appear to be required for genomic SNCA triplication. Ann Neurol 2008</div>
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<abstract>Objective: Copy number variation is a common polymorphic phenomenon within the human genome. Although the majority of these events are non‐deleterious they can also be highly pathogenic. Herein we characterize five families with parkinsonism that have been identified to harbor multiplication of the chromosomal 4q21 locus containing the α‐synuclein gene (SNCA). Methods: A methodological approach using fluorescent in situ hybridization and Affymetrix (Santa Clara, CA) 250K SNP microarrays was used to characterize the multiplication in each family and to identify the genes encoded within the region. The telomeric and centromeric breakpoints of each family were further narrowed using semiquantitative polymerase chain reaction with microsatellite markers and then screened for transposable repeat elements. Results: The severity of clinical presentation is correlated with SNCA dosage and does not appear to be overtly affected by the presence of other genes in the multiplicated region. With the exception of the Lister kindred, in each family the multiplication event appears de novo. The type and position of Alu/LINE repeats are also different at each breakpoint. Microsatellite analysis demonstrates two genomic mechanisms are responsible for chromosome 4q21 multiplications, including both SNCA duplication and recombination. Interpretation: SNCA dosage is responsible for parkinsonism, autonomic dysfunction, and dementia observed within each family. We hypothesize dysregulated expression of wild‐type α‐synuclein results in parkinsonism and may explain the recent association of common SNCA variants in sporadic Parkinson's disease. SNCA genomic duplication results from intraallelic (segmental duplication) or interallelic recombination with unequal crossing over, whereas both mechanisms appear to be required for genomic SNCA triplication. Ann Neurol 2008</abstract>
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<p>Objective: Copy number variation is a common polymorphic phenomenon within the human genome. Although the majority of these events are non‐deleterious they can also be highly pathogenic. Herein we characterize five families with parkinsonism that have been identified to harbor multiplication of the chromosomal 4q21 locus containing the α‐synuclein gene (SNCA). Methods: A methodological approach using fluorescent in situ hybridization and Affymetrix (Santa Clara, CA) 250K SNP microarrays was used to characterize the multiplication in each family and to identify the genes encoded within the region. The telomeric and centromeric breakpoints of each family were further narrowed using semiquantitative polymerase chain reaction with microsatellite markers and then screened for transposable repeat elements. Results: The severity of clinical presentation is correlated with SNCA dosage and does not appear to be overtly affected by the presence of other genes in the multiplicated region. With the exception of the Lister kindred, in each family the multiplication event appears de novo. The type and position of Alu/LINE repeats are also different at each breakpoint. Microsatellite analysis demonstrates two genomic mechanisms are responsible for chromosome 4q21 multiplications, including both SNCA duplication and recombination. Interpretation: SNCA dosage is responsible for parkinsonism, autonomic dysfunction, and dementia observed within each family. We hypothesize dysregulated expression of wild‐type α‐synuclein results in parkinsonism and may explain the recent association of common SNCA variants in sporadic Parkinson's disease. SNCA genomic duplication results from intraallelic (segmental duplication) or interallelic recombination with unequal crossing over, whereas both mechanisms appear to be required for genomic SNCA triplication. Ann Neurol 2008</p>
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<title type="main">Objective</title>
<p>Copy number variation is a common polymorphic phenomenon within the human genome. Although the majority of these events are non‐deleterious they can also be highly pathogenic. Herein we characterize five families with parkinsonism that have been identified to harbor multiplication of the chromosomal 4q21 locus containing the α‐
<i>synuclein</i>
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<i>SNCA</i>
).</p>
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<title type="main">Methods</title>
<p>A methodological approach using fluorescent in situ hybridization and Affymetrix (Santa Clara, CA) 250K SNP microarrays was used to characterize the multiplication in each family and to identify the genes encoded within the region. The telomeric and centromeric breakpoints of each family were further narrowed using semiquantitative polymerase chain reaction with microsatellite markers and then screened for transposable repeat elements.</p>
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<p>The severity of clinical presentation is correlated with
<i>SNCA</i>
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<i>SNCA</i>
duplication and recombination.</p>
</section>
<section xml:id="abs1-4">
<title type="main">Interpretation</title>
<p>
<i>SNCA</i>
dosage is responsible for parkinsonism, autonomic dysfunction, and dementia observed within each family. We hypothesize dysregulated expression of wild‐type α‐synuclein results in parkinsonism and may explain the recent association of common
<i>SNCA</i>
variants in sporadic Parkinson's disease.
<i>SNCA</i>
genomic duplication results from intraallelic (segmental duplication) or interallelic recombination with unequal crossing over, whereas both mechanisms appear to be required for genomic
<i>SNCA</i>
triplication. Ann Neurol 2008</p>
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<title>Genomic investigation of α‐synuclein multiplication and parkinsonism</title>
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<titleInfo type="abbreviated" lang="en">
<title>SNCA and Parkinsonism</title>
</titleInfo>
<titleInfo type="alternative" contentType="CDATA" lang="en">
<title>Genomic investigation of α‐synuclein multiplication and parkinsonism</title>
</titleInfo>
<name type="personal">
<namePart type="given">Owen A.</namePart>
<namePart type="family">Ross</namePart>
<namePart type="termsOfAddress">PhD</namePart>
<affiliation>Division of Neurogenetics, Department of Neuroscience, College of Medicine, Mayo Clinic, Jacksonville, FL</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Adam T.</namePart>
<namePart type="family">Braithwaite</namePart>
<namePart type="termsOfAddress">BSc</namePart>
<affiliation>Division of Neurogenetics, Department of Neuroscience, College of Medicine, Mayo Clinic, Jacksonville, FL</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Lisa M.</namePart>
<namePart type="family">Skipper</namePart>
<namePart type="termsOfAddress">PhD</namePart>
<affiliation>Division of Neurogenetics, Department of Neuroscience, College of Medicine, Mayo Clinic, Jacksonville, FL</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Jennifer</namePart>
<namePart type="family">Kachergus</namePart>
<namePart type="termsOfAddress">BSc, MBA</namePart>
<affiliation>Division of Neurogenetics, Department of Neuroscience, College of Medicine, Mayo Clinic, Jacksonville, FL</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Mary M.</namePart>
<namePart type="family">Hulihan</namePart>
<namePart type="termsOfAddress">MPH</namePart>
<affiliation>Division of Neurogenetics, Department of Neuroscience, College of Medicine, Mayo Clinic, Jacksonville, FL</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Frank A.</namePart>
<namePart type="family">Middleton</namePart>
<namePart type="termsOfAddress">PhD</namePart>
<affiliation>Center for Neuropsychiatric Genetics, Microarray Core Facility, State University of New York Upstate Medical University, Syracuse, NY</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Kenya</namePart>
<namePart type="family">Nishioka</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, Japan</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Julia</namePart>
<namePart type="family">Fuchs</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Department of Neurodegenerative Diseases, Center for Neurology, Hertie‐Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Thomas</namePart>
<namePart type="family">Gasser</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Department of Neurodegenerative Diseases, Center for Neurology, Hertie‐Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Demetrius M.</namePart>
<namePart type="family">Maraganore</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Department of Neurology, Mayo Clinic College of Medicine, Rochester, MN</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Charles H.</namePart>
<namePart type="family">Adler</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Department of Neurology, Mayo Clinic College of Medicine, Scottsdale, AZ</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Lydie</namePart>
<namePart type="family">Larvor</namePart>
<namePart type="termsOfAddress">PhD</namePart>
<affiliation>EA2683 ministère de l' éducation nationale de la recherche et de la technologie (MENRT), Diagnostic and Physiopathology of Parkinson's Disease, Institut de Recherches sur le Cancer de Lille (IRCL), Lille Cedex, France</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Marie‐Christine</namePart>
<namePart type="family">Chartier‐Harlin</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>EA2683 ministère de l' éducation nationale de la recherche et de la technologie (MENRT), Diagnostic and Physiopathology of Parkinson's Disease, Institut de Recherches sur le Cancer de Lille (IRCL), Lille Cedex, France</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Christer</namePart>
<namePart type="family">Nilsson</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Department of Clinical Medicine, Division of Geriatric Psychiatry, Lund University, Lund, Sweden</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">J. William</namePart>
<namePart type="family">Langston</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Parkinson's Institute and Clinical Center, Sunnyvale, CA</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Katrina</namePart>
<namePart type="family">Gwinn</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Neurogenetics, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Nobutaka</namePart>
<namePart type="family">Hattori</namePart>
<namePart type="termsOfAddress">MD</namePart>
<affiliation>Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, Japan</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Matthew J.</namePart>
<namePart type="family">Farrer</namePart>
<namePart type="termsOfAddress">PhD</namePart>
<affiliation>Division of Neurogenetics, Department of Neuroscience, College of Medicine, Mayo Clinic, Jacksonville, FL</affiliation>
<description>Correspondence: Morris K. Udall Parkinson's Disease Research Center of Excellence, Mayo Clinic, Department of Neuroscience, 4500 San Pablo Road South, Jacksonville, FL 32224</description>
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<place>
<placeTerm type="text">Hoboken</placeTerm>
</place>
<dateIssued encoding="w3cdtf">2008-06</dateIssued>
<dateCaptured encoding="w3cdtf">2007-11-08</dateCaptured>
<dateValid encoding="w3cdtf">2008-02-11</dateValid>
<copyrightDate encoding="w3cdtf">2008</copyrightDate>
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<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<abstract lang="en">Objective: Copy number variation is a common polymorphic phenomenon within the human genome. Although the majority of these events are non‐deleterious they can also be highly pathogenic. Herein we characterize five families with parkinsonism that have been identified to harbor multiplication of the chromosomal 4q21 locus containing the α‐synuclein gene (SNCA). Methods: A methodological approach using fluorescent in situ hybridization and Affymetrix (Santa Clara, CA) 250K SNP microarrays was used to characterize the multiplication in each family and to identify the genes encoded within the region. The telomeric and centromeric breakpoints of each family were further narrowed using semiquantitative polymerase chain reaction with microsatellite markers and then screened for transposable repeat elements. Results: The severity of clinical presentation is correlated with SNCA dosage and does not appear to be overtly affected by the presence of other genes in the multiplicated region. With the exception of the Lister kindred, in each family the multiplication event appears de novo. The type and position of Alu/LINE repeats are also different at each breakpoint. Microsatellite analysis demonstrates two genomic mechanisms are responsible for chromosome 4q21 multiplications, including both SNCA duplication and recombination. Interpretation: SNCA dosage is responsible for parkinsonism, autonomic dysfunction, and dementia observed within each family. We hypothesize dysregulated expression of wild‐type α‐synuclein results in parkinsonism and may explain the recent association of common SNCA variants in sporadic Parkinson's disease. SNCA genomic duplication results from intraallelic (segmental duplication) or interallelic recombination with unequal crossing over, whereas both mechanisms appear to be required for genomic SNCA triplication. Ann Neurol 2008</abstract>
<note type="funding">American Parkinson Disease Association</note>
<note type="funding">Morris K. Udall Parkinson's Disease Research Center of Excellence (National Institute of Neurological Disorders and Stroke) - No. P50 #NS40256; </note>
<note type="funding">NIH (National Institute of Aging) - No. P01 #AG17216; </note>
<note type="funding">German National Genome Network (NGFN) - No. 01GS0116; </note>
<note type="funding">PHRC 2005/1914 the Universite de Lille 2 and Institut National de la Sante et de la Recherche Medicale</note>
<note type="funding">Draper Family Foundation</note>
<note type="funding">NIH (National Institute of Neurological Disorders and Stroke) - No. #N01‐NS‐2‐2349; </note>
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<titleInfo>
<title>Annals of Neurology</title>
<subTitle>Official Journal of the American Neurological Association and the Child Neurology Society</subTitle>
</titleInfo>
<titleInfo type="abbreviated">
<title>Ann Neurol.</title>
</titleInfo>
<genre type="Journal">journal</genre>
<note type="content"> This article includes supplementary materials available via the Internet at http://www.interscience.wiley.com/jpages/0364‐5134/suppmat</note>
<subject>
<genre>article category</genre>
<topic>Original Article</topic>
</subject>
<identifier type="ISSN">0364-5134</identifier>
<identifier type="eISSN">1531-8249</identifier>
<identifier type="DOI">10.1002/(ISSN)1531-8249</identifier>
<identifier type="PublisherID">ANA</identifier>
<part>
<date>2008</date>
<detail type="volume">
<caption>vol.</caption>
<number>63</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>6</number>
</detail>
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<start>743</start>
<end>750</end>
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<identifier type="DOI">10.1002/ana.21380</identifier>
<identifier type="ArticleID">ANA21380</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright © 2008 American Neurological Association</accessCondition>
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