Huntington's disease is a disorder that may be inherited.
Gene . The transmission of genes to an organism 's offspring is the basis of the inheritance of phenotypic traits . Huntington's disease . Expansion of CAG ( cytosine-adenine-guanine ) triplet repeats in the gene coding for the Huntingtin protein results in an abnormal protein , which gradually damages cells in the brain , through mechanisms that are not fully understood .