How Many CAG Nucleotide Repeats are Commonly Found in Patients

Question

How many CAG nucleotide repeats are commonly found in patients with Huntington's disease?
A) 1-10
B) 11-34
C) 42-100
D) 200-500
E) 1000-2000

Accepted Answer

Patients with Huntington's disease commonly have CAG nucleotide repeats in the range of 42-100. A repeat length of 36-39 may also cause the disease, but this is less common. Shorter repeats of less than 36 are considered normal, while longer repeats above 100 may result in earlier onset and more severe symptoms.