Gametic and somatic tissue–specific heterogeneity of the expanded SCA1 CAG repeat in spinocerebellar ataxia type 1

Samuel S. Chong, Alanna E. McCall, Juan Cota, S. H. Subramony, Harry T. Orr, Mark R. Hughes, Huda Y. Zoghbi

Research output: Contribution to journalArticlepeer-review

154 Scopus citations

Abstract

Spinocerebellar ataxia type 1 is associated with expansion of an unstable CAG repeat within the SCA1 gene. Male gametic heterogeneity of the expanded repeat is demonstrated using single sperm and low–copy genome analysis. Low–copy genome analysis of peripheral blood also reveals somatic heterogeneity of the expanded SCA1 allele, thus establishing mitotic instability at this locus. Comparative analysis of a large normal allele and a small affected allele suggests a role of midstream CAT interspersions in stabilizing long (CAG)n stretches. Within the brain, tissue–specific mosaicism of the expanded allele is also observed. The differences in SCA1 allele heterogeneity between sperm and blood and within the brain parallels the findings in Huntington disease, suggesting that both disorders share a common mechanism for tissue–specific instability.

Original languageEnglish (US)
Pages (from-to)344-350
Number of pages7
JournalNature Genetics
Volume10
Issue number3
DOIs
StatePublished - Jul 1995

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