Huntington disease is a problem of too many CAG repeats. The mutated HTT gene codes for the huntingtin protein. It’s located on chromosome 4.

To remember this, note that H is a rather symmetrical letter. It can be divided into quadrants.

The next time you cut a cake, consider doing it in 4 equal pieces and think of this unfortunate neurological condition.

Bibliography

1. MedlinePlus Genetics. 2020. HTT gene. [online] Available at: <https://medlineplus.gov/genetics/gene/htt/> [Accessed 1 September 2021].