Lack of mutations in spinocerebellar ataxia type 2 and 3 genes in a Taiwanese (ethnic Chinese) cohort of familial and early‐onset parkinsonism
Identifieur interne : 001032 ( Main/Exploration ); précédent : 001031; suivant : 001033Lack of mutations in spinocerebellar ataxia type 2 and 3 genes in a Taiwanese (ethnic Chinese) cohort of familial and early‐onset parkinsonism
Auteurs : Chin-Hsien Lin [Taïwan] ; Wuh-Liang Hwu [Taïwan] ; Shu-Chuan Chiang [Taïwan] ; Chun-Hwei Tai [Taïwan] ; Ruey-Meei Wu [Taïwan]Source :
- American Journal of Medical Genetics Part B: Neuropsychiatric Genetics [ 1552-4841 ] ; 2007-06-05.
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Abstract
Recent reports suggest that CAG triplet expansions of spinocerebellar ataxia type 2 and 3 (SCA2 and SCA3) genes are the cause of typical levodopa‐responsive Parkinson's disease (PD) in familial cases, several of which were ethnic Chinese. To investigate the role of SCA2 and SCA3 mutations in Chinese familial and early‐onset PD patients, we analyzed CAG triplet repeat expansions of SCA2 and SCA3 genes in a cohort of 73 Taiwanese/Ethnic Chinese familial and early‐onset PD patients [mean age at onset 42.70 ± 7.17 years (mean ± SD)]. Thirteen of them (17.8%) had positive family history. All patients received comprehensive clinical evaluation including a thorough neurological examination, laboratory tests, and neuroimaging studies to exclude secondary causes and atypical parkinsonism. The CAG repeat length in these genes was determined using polymerase chain reaction polyacrylamide gel electrophoresis. SCA2 gene CAG repeats ranged from 15 to 26 repeats with a median of 20, and SCA3 gene CAG repeats ranged from 15 to 40 with a median of 15. No long pathogenic repeats were found in either SCA2 or SCA3, although borderline CAG repeat number was detected in the SCA3 gene of four patients. Thus, mutations of SCA2 or SCA3 did not play a major role in familial or early‐onset PD in our study cohort. PD patients without autosomal dominant family history or obvious cerebellar ataxia should not be candidates for routine screening of SCA2 or SCA3 mutations for cost‐effectiveness. © 2007 Wiley‐Liss, Inc.
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DOI: 10.1002/ajmg.b.30427
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J. Med. Genet.</title><idno type="ISSN">1552-4841</idno><idno type="eISSN">1552-485X</idno><imprint><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>Hoboken</pubPlace><date type="published" when="2007-06-05">2007-06-05</date><biblScope unit="volume">144B</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="434">434</biblScope><biblScope unit="page" to="438">438</biblScope></imprint><idno type="ISSN">1552-4841</idno></series><idno type="istex">979B08B7AD1BBC74D4AF87009B01B1D645E1C0C6</idno><idno type="DOI">10.1002/ajmg.b.30427</idno><idno type="ArticleID">AJMG30427</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1552-4841</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>SCA2</term><term>SCA3</term><term>Taiwanese</term><term>early‐onset parkinsonism</term><term>ethnic Chinese</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Recent reports suggest that CAG triplet expansions of spinocerebellar ataxia type 2 and 3 (SCA2 and SCA3) genes are the cause of typical levodopa‐responsive Parkinson's disease (PD) in familial cases, several of which were ethnic Chinese. To investigate the role of SCA2 and SCA3 mutations in Chinese familial and early‐onset PD patients, we analyzed CAG triplet repeat expansions of SCA2 and SCA3 genes in a cohort of 73 Taiwanese/Ethnic Chinese familial and early‐onset PD patients [mean age at onset 42.70 ± 7.17 years (mean ± SD)]. Thirteen of them (17.8%) had positive family history. All patients received comprehensive clinical evaluation including a thorough neurological examination, laboratory tests, and neuroimaging studies to exclude secondary causes and atypical parkinsonism. The CAG repeat length in these genes was determined using polymerase chain reaction polyacrylamide gel electrophoresis. SCA2 gene CAG repeats ranged from 15 to 26 repeats with a median of 20, and SCA3 gene CAG repeats ranged from 15 to 40 with a median of 15. No long pathogenic repeats were found in either SCA2 or SCA3, although borderline CAG repeat number was detected in the SCA3 gene of four patients. Thus, mutations of SCA2 or SCA3 did not play a major role in familial or early‐onset PD in our study cohort. PD patients without autosomal dominant family history or obvious cerebellar ataxia should not be candidates for routine screening of SCA2 or SCA3 mutations for cost‐effectiveness. © 2007 Wiley‐Liss, Inc.</div></front></TEI><affiliations><list><country><li>Taïwan</li></country></list><tree><country name="Taïwan"><noRegion><name sortKey="Lin, Chin Sien" sort="Lin, Chin Sien" uniqKey="Lin C" first="Chin-Hsien" last="Lin">Chin-Hsien Lin</name></noRegion><name sortKey="Chiang, Shu Huan" sort="Chiang, Shu Huan" uniqKey="Chiang S" first="Shu-Chuan" last="Chiang">Shu-Chuan Chiang</name><name sortKey="Hwu, Wuh Iang" sort="Hwu, Wuh Iang" uniqKey="Hwu W" first="Wuh-Liang" last="Hwu">Wuh-Liang Hwu</name><name sortKey="Tai, Chun Wei" sort="Tai, Chun Wei" uniqKey="Tai C" first="Chun-Hwei" last="Tai">Chun-Hwei Tai</name><name sortKey="Wu, Ruey Eei" sort="Wu, Ruey Eei" uniqKey="Wu R" first="Ruey-Meei" last="Wu">Ruey-Meei Wu</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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