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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 : 001654 ( Main/Corpus ); précédent : 001653; suivant : 001655

Lack 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 ; Wuh-Liang Hwu ; Shu-Chuan Chiang ; Chun-Hwei Tai ; Ruey-Meei Wu

Source :

RBID : ISTEX:979B08B7AD1BBC74D4AF87009B01B1D645E1C0C6

English descriptors

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.

Url:
DOI: 10.1002/ajmg.b.30427

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ISTEX:979B08B7AD1BBC74D4AF87009B01B1D645E1C0C6

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<title type="main" xml:lang="en">Lack of mutations in spinocerebellar ataxia type 2 and 3 genes in a Taiwanese (ethnic Chinese) cohort of familial and early‐onset parkinsonism
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<fi>SCA2</fi>
and
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in Early‐Onset and Familial Parkinsonism in Taiwanese</title>
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<personName>
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<p>Recent reports suggest that CAG triplet expansions of spinocerebellar ataxia type 2 and 3 (
<i>SCA2</i>
and
<i>SCA3</i>
) 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
<i>SCA2</i>
and
<i>SCA3</i>
mutations in Chinese familial and early‐onset PD patients, we analyzed CAG triplet repeat expansions of
<i>SCA2</i>
and
<i>SCA3</i>
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.
<i>SCA2</i>
gene CAG repeats ranged from 15 to 26 repeats with a median of 20, and
<i>SCA3</i>
gene CAG repeats ranged from 15 to 40 with a median of 15. No long pathogenic repeats were found in either
<i>SCA2</i>
or
<i>SCA3</i>
, although borderline CAG repeat number was detected in the
<i>SCA3</i>
gene of four patients. Thus, mutations of
<i>SCA2</i>
or
<i>SCA3</i>
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
<i>SCA2</i>
or
<i>SCA3</i>
mutations for cost‐effectiveness. © 2007 Wiley‐Liss, Inc.</p>
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<p>Please cite this article as follows: Lin C‐H, Hwu W‐L, Chiang S‐C, Tai C‐H, Wu R‐M. 2007. Lack of Mutations in Spinocerebellar Ataxia Type 2 and 3 Genes in a Taiwanese (Ethnic Chinese) Cohort of Familial and Early‐Onset Parkinsonism. Am J Med Genet Part B 144B:434–438.</p>
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<abstract 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.</abstract>
<note type="content">*Please cite this article as follows: Lin C‐H, Hwu W‐L, Chiang S‐C, Tai C‐H, Wu R‐M. 2007. Lack of Mutations in Spinocerebellar Ataxia Type 2 and 3 Genes in a Taiwanese (Ethnic Chinese) Cohort of Familial and Early‐Onset Parkinsonism. Am J Med Genet Part B 144B:434–438.</note>
<subject lang="en">
<genre>Keywords</genre>
<topic>SCA2</topic>
<topic>SCA3</topic>
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<topic>ethnic Chinese</topic>
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<identifier type="ISSN">1552-4841</identifier>
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<part>
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<number>144B</number>
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<identifier type="ISSN">0148-7299</identifier>
<identifier type="ISSN">1096-8628</identifier>
<part>
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