Evidence of a common founder for SCA12 in the Indian population

S. Bahl, K. Virdi, U. Mittal, M. P. Sachdeva, A. K. Kalla, S. E. Holmes, E. O'Hearn, R. L. Margolis, S. Jain, A. K. Srivastava, Mitali Mukerji

Research output: Contribution to journalArticlepeer-review

Abstract

Spinocerebellar ataxia type 12 (SCA12) is an autosomal dominant cerebellar ataxia associated with the expansion of an unstable CAG repeat in the 5′ region of the PPP2R2B gene on chromosome 5q31-5q32. We found that it accounts for ∼16% (20/124) of all the autosomal dominant ataxia cases diagnosed in AIIMS, a major tertiary referral centre in North India. The length of the expanded allele in this population ranges from 51-69 CAG triplets. Interestingly, all the affected families belong to an endogamous population, which originated in the state of Haryana, India. We identified four novel SNPs and a dinucleotide marker spanning ∼137 kb downstream of CAG repeat in the PPP2R2B gene. Analysis of 20 Indian SCA12 families and ethnically matched normal unrelated individuals revealed one haplotype to be significantly associated with the affected alleles (P = 0.000), clearly indicating the presence of a common founder for SCA12 in the Indian population. This haplotype was not shared by the American pedigree with SCA12. Therefore, the SCA12 expansion appears to have originated at least twice.

Original languageEnglish (US)
Pages (from-to)528-534
Number of pages7
JournalAnnals of Human Genetics
Volume69
Issue number5
DOIs
StatePublished - Sep 2005

Keywords

  • CAG repeat
  • Founder
  • Polymorphism
  • Spinocerebellar ataxia type 12

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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