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Review Question - QID 3695

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QID 3695 (Type "3695" in App Search)
A 46-year-old female begins to have personality changes, cognitive decline, and chorea. Her father began having similar but less severe symptoms at age 55 before passing away 6 years later. One of her 2 older siblings has also begun to show deterioration. Which of the following describes the hereditary pattern of this disease?

Autosomal dominant with variable penetrance

21%

711/3329

Autosomal recessive with variable penetrance

3%

113/3329

X-linked recessive

3%

105/3329

Autosomal dominant with anticipation

70%

2321/3329

Autosomal dominant with imprinting

2%

62/3329

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This clinical vignette describes a patient with Huntington's disease. Huntington's disease has an autosomal dominant hereditary pattern with anticipation. Anticipation is a term used to describe trinucleotide repeat disorders that if passed on, will present earlier and more severely in affected subjects than in their affected parent. In Huntington's disease, it is due to a "CAG" trinucleotide repeat on chromosome 4. Subjects with an affected parent have a 50% chance of inheriting the disease from them, and if present will have more severe disease.

Deighton et al provide a review on the genetics of musculoskeletal disease including the hereditary pattern of anticipation.

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