Cloning of the gene for spinocerebellar ataxia 2 reveals a locus with high sensitivity to expanded CAG/glutamine repeats.
Nat Genet
; 14(3): 285-91, 1996 Nov.
Article
en En
| MEDLINE
| ID: mdl-8896557
ABSTRACT
Two forms of the neurodegenerative disorder spinocerebellar ataxia are known to be caused by the expansion of a CAG (polyglutamine) trinucleotide repeat. By screening cDNA expression libraries, using an antibody specific for polyglutamine repeats, we identified six novel genes containing CAG stretches. One of them is mutated in patients with spinocerebellar ataxia linked to chromosome 12q (SCA2). This gene shows ubiquitous expression and encodes a protein of unknown function. Normal SCA2 alleles (17 to 29 CAG repeats) contain one to three CAAs in the repeat. Mutated alleles (37 to 50 repeats) appear particularly unstable, upon both paternal and maternal transmissions. The sequence of three of them revealed pure CAG stretches. The steep inverse correlation between age of onset and CAG number suggests a higher sensitivity to polyglutamine length than in the other polyglutamine expansion diseases.
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Bases de datos:
MEDLINE
Asunto principal:
Secuencias Repetitivas de Ácidos Nucleicos
/
Proteínas
/
Degeneraciones Espinocerebelosas
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
Límite:
Adolescent
/
Adult
/
Child
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Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Nat Genet
Asunto de la revista:
GENETICA MEDICA
Año:
1996
Tipo del documento:
Article
País de afiliación:
Francia