Abstract:
:Spinocerebellar ataxia type 2 (SCA2) is caused by the expansion of an unstable CAG repeat encoding a polyglutamine tract. Repeats with 32 to 200 CAGs are associated with the disease, whereas normal chromosomes contain 13 to 33 repeats. We tested 220 families of different geographical origins for the SCA2 mutation. Thirty three were positive (15%). Twenty three families with at least two affected subjects were tested for linkage disequilibium (LD) between the SCA2 mutation and three microsatellite markers, two of which (D12S1332-D12S1333) closely flanked the mutation; the other (D12S1672) was intragenic. Many different haplotypes were observed, indicating the occurrence of several ancestral mutations. However, the same haplotype, not observed in controls, was detected in the German, the Serbian, and some of the French families, suggesting a founder effect or recurrent mutations on an at risk haplotype.
journal_name
J Med Genetjournal_title
Journal of medical geneticsauthors
Didierjean O,Cancel G,Stevanin G,Dürr A,Bürk K,Benomar A,Lezin A,Belal S,Abada-Bendid M,Klockgether T,Brice Akeywords:
subject
Has Abstractpub_date
1999-05-01 00:00:00pages
415-7issue
5eissn
0022-2593issn
1468-6244journal_volume
36pub_type
杂志文章abstract::Rubinstein-Taybi syndrome (RTS) is a well delineated multiple congenital anomaly syndrome characterised by mental retardation, broad thumbs and toes, short stature, and specific facial features. The recent localisation of the disorder to 16p13.3 and subsequent identification of a submicroscopic deletion of this region...
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更新日期:1988-03-01 00:00:00
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