Fig. 3: Neurocognitive phenotype of HTT intermediate alleles carriers.

The graphs summarize the clinical characteristics of symptomatic cases represented as, (a) Onset of symptoms in intermediate (green, n = 49), reduced-penetrance (orange, n = 13) and full-penetrance (blue, n = 229) alleles carriers by the number of CAG repeats. The purple lines indicate the prediction of age at onset by Langbehn et al. [50], average (solid line) ± SD (dotted lines). (b) Venn diagram depicting the breakdown of neurocognitive signs into motor, cognitive and behavioural in 82 HTT intermediate allele carriers.