The Htt gene encodes for the huntingtin protein which plays a role in normal development but its exact function remains unknown .
Huntington 's is caused by an autosomal dominant mutation expanding the number of glutamine codon repeats ( CAG ) within the Huntingtin gene ( Htt ) .
The Htt gene encodes for the huntingtin protein which plays a role in normal development but its exact function remains unknown .
Huntington 's is caused by an autosomal dominant mutation expanding the number of glutamine codon repeats ( CAG ) within the Huntingtin gene ( Htt ) .