Volume 38, Issue 3 pp. 180-186
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Very early onset Huntington's disease: genetic mechanism and risk to siblings

David J. Clarke

Corresponding Author

David J. Clarke

Department of Psychiatry, Queen Elizabeth Hospital, and Department of Clinical Genetics, Birmingham Maternity Hospital, Birmingham, UK

Dept. of Psychiatry Queen Elizabeth Hospital Birmingham B15 2TH U.K.Search for more papers by this author
Sarah Bundey

Sarah Bundey

Department of Psychiatry, Queen Elizabeth Hospital, and Department of Clinical Genetics, Birmingham Maternity Hospital, Birmingham, UK

Search for more papers by this author
First published: September 1990
Citations: 10

Abstract

A study of very early onset Huntington's disease (VEOHD) has shown that at least 38% of gene-carrying sibs also develop symptoms before the age of 10, thus improving the genetic risk for those sibs who remain healthy. The prevalence of VEOHD among sibs shows that mutation during spermatogenesis is most unlikely to account for these uncommon cases. The data suggest that two mechanisms contribute to VEOHD: modification by many genes (individually of small effect), and an epigenetic mechanism occurring when transmission is through a series of males.

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