MT-ND6 (Mitochondrially Encoded NADH Dehydrogenase 6) is a protein-coding gene and is associated with melas syndrome and leber hereditary optic neuropathy with dystonia (http://www.genecards.org/cgi-bin/carddisp.pl?gene=MT-ND6). The gene discussed is MT-ND6; the disease is Leber hereditary optic neuropathy.