<P> HD is one of several trinucleotide repeat disorders which are caused by the length of a repeated section of a gene exceeding a normal range . The HTT gene is located on the short arm of chromosome 4 at 4p16. 3 . HTT contains a sequence of three DNA bases -- cytosine - adenine - guanine ( CAG ) -- repeated multiple times ( i.e. ... CAGCAGCAG ... ) , known as a trinucleotide repeat . CAG is the 3 - letter genetic code ( codon ) for the amino acid glutamine , so a series of them results in the production of a chain of glutamine known as a polyglutamine tract ( or polyQ tract ) , and the repeated part of the gene , the PolyQ region . </P>
<P> HD is one of several trinucleotide repeat disorders which are caused by the length of a repeated section of a gene exceeding a normal range . The HTT gene is located on the short arm of chromosome 4 at 4p16. 3 . HTT contains a sequence of three DNA bases -- cytosine - adenine - guanine ( CAG ) -- repeated multiple times ( i.e. ... CAGCAGCAG ... ) , known as a trinucleotide repeat . CAG is the 3 - letter genetic code ( codon ) for the amino acid glutamine , so a series of them results in the production of a chain of glutamine known as a polyglutamine tract ( or polyQ tract ) , and the repeated part of the gene , the PolyQ region . </P>
what chromosome has the genetic mutation for huntington 's disease
what chromosome has the genetic mutation for huntington 's disease
chromosome 4
chromosome 4