MT-ATP6 and Ataxia: Of interest the previously reported truncating MT-ATP6 mutation m.9127-9128delAT; p.(Ile201Profs*2) was associated with myoclonic epilepsy, ataxia, and cerebellar atrophy, although the muscle biopsy did not reveal RRF.9 The phenotype was considered consistent with NARP, despite no evidence of neuropathy.