- The murine homologues of the Huntington disease gene (Hdh) and the alpha-adducin gene (Add1) map to mouse chromosome 5 within a region of conserved synteny with human chromosome 4p16.3. Nasir, J., Lin, B., Bucan, M., Koizumi, T., Nadeau, J.H., Hayden, M.R. Genomics (1994)