Abstract
The expanded CAG repeat results in somatic mosaicism and genetic anticipation in Huntington’s disease (HD). Here we report a longitudinal study examining CAG repeat instability in lymphocytes and sperm of three HD monkeys throughout their whole life-span that encompass the prodromal to symptomatic stages of HD. We demonstrate a progressive increase in CAG repeat length in lymphocytes and sperm as the animals aged. We also examined the impact of CAG repeat length on expansion rate, which showed a clear linear correlation up to 62Q, and high instability after. Our findings stress the importance of further investigation in CAG instability in peripheral blood cells longitudinally.
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