Trinucleotide repeat elongation in the Huntingtin gene in Huntington Disease patients from 71 Danish families

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Abstract
IT 15 Is a novel gene, localized to chromosome 4, and encodlng a protein named Huntingtin. A polymorphic CAG repeat in the proposed open reading frame of IT 15 has been characterized, and an elongation of this repeat has been correlated to Huntlngton's Disease. We have investigated the CAG repeat in the Huntingtin gene In 71 unrelated Danish patients with Huntington's Disease, and found repeat lengths of 39 to 70 repeat units in contrast to 9 to 30 CAG's on normal chromosomes. Comparison of repeat length and age at onset of disease symptoms in 52 individuals indicates an inverse correlation between the age at onset and the number of CAG repeat units.

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