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"However, due to environmental or genetic causes, there might be as many as 100 CAG repeats in the cells of people with Huntington's disease."

Expansion into an extraordinary number of repeated CAG sequences of DNA is associated with earlier onset and increased severity of Huntington's disease symptoms.

"Even healthy people have up to 34 CAG repeats on a particular gene, the HTT gene," Wang said.

A new Nature journal article details how RNA methylation on CAG repeats is implicated in the complex mechanism underlying Huntington's disease.

In Huntington's disease, this expansion occurs with three nucleotides, cytosine-adenine-guanine, or CAG.