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Journal Article
Research Support, U.S. Gov't, P.H.S.
Stability of the Huntington disease (CAG)n repeat in a late onset form occuring on the Island of Crete.
Human Molecular Genetics 1995 December
Huntington disease (HD) is an autosomal-dominant disorder of mid-life onset characterized by chorea, dementia, and oculomotor disturbances. Anticipation is commonly seen in HD families, particularly when the disease is inherited through the father. The disorder is associated with an expanded (CAG)n repeat in the IT15 gene that is unstable and tends to increase in size during meiotic transmissions, particularly of paternal origin. We have detected an unusual form of HD on the island of Crete which has distinctly different characteristics. Data from eight families encompassing 48 HD patients, showed a median age at onset 15-20 years later than that for HD occurring worldwide. There is no juvenile cases and no anticipation. DNA analysis in 12 HD patients showed expansion of the (CAG)n repeat the size of which was identical among members of each family or varied by only one unit. The elongated DNA segment was passed stably or contracted during both paternal and maternal transmissions thus indicating that unique molecular mechanisms may be operational in this form of HD.
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