A Spanish sporadic case of deafness-dystonia (Mohr-Tranebjaerg) syndrome with a novel mutation in the gene encoding TIMM8a, a component of the mitochondrial protein translocase complexes.

Mohr-Tranebjaerg syndrome is a rare X-linked condition characterized by the association of dystonia and progressive postlingual sensorineural hearing impairment. Here we report the clinical and genetic findings in a Spanish patient with MTS carrying a novel mutation in the DDP1 (deafness-dystonia peptide 1) gene, which encodes TIMM8a, a component of the mitochondrial protein translocation system. The phenotypic variability observed in patients with Mohr-Tranebjaerg syndrome suggests the involvement of modifier factors which may modulate the clinical manifestations of the syndrome.