HTT and juvenile Huntington disease: Huntington’s disease, often known as “Westphal disease,” is an autosomal dominant condition that causes the cytosine-adenine-guanine (CAG) trinucleotide to proliferate, resulting in the creation of a mutant protein known as Huntingtin (Htt), which causes the loss of psychomotor skills (Squitieri et al., 2006).