Question

Huntington's disease occurs when a CAG repeat expansion in the coding region of the HTT gene becomes too long. The CAG repeat is also in frame.

(... | CAG | CAG | CAG | ...)

Which amino acid is coded for in this repeat?

a) glutamine

b) proline

c) glutamic acid

d) asparagine

Answer 1

The CAG repeat expansion in the HTT gene codes for glutamine.

Step-by-step explanation:

The CAG repeat expansion in the coding region of the HTT gene in Huntington's disease codes for the amino acid glutamine (a).