Mitochondrial import inner membrane translocase subunit Tim8 A (TIMM8A)

Mitochondrial import inner membrane translocase subunit Tim8 A (TIMM8A) is a small mitochondrial intermembrane space chaperone that forms a complex with TIMM13 to facilitate the import and insertion of specific nuclear-encoded hydrophobic proteins into the mitochondrial inner membrane[1][2][3][5]. The TIMM8A-TIMM13 complex is essential for proper mitochondrial protein homeostasis and mitochondrial dynamics, especially in neuronal cells, contributing to the assembly of respiratory chain complexes. Loss-of-function mutations in TIMM8A disrupt this process and cause the severe, X-linked, neurodegenerative Mohr–Tranebjaerg syndrome (deafness-dystonia-optic neuronopathy, DDON), characterized by progressive sensorineural deafness, dystonia, and visual impairment[3][5][6]. TIMM8A is not currently considered a direct therapeutic target (no drugs specifically modulate its activity), but its highly penetrant role in rare genetic disease makes it a biomarker for certain inherited neurodegenerative and mitochondrial disorders[3][6].

Other names

DDPDDP1DFN1MTSTIM8Deafness dystonia protein 1X-linked deafness dystonia proteindeafness/dystonia peptidetranslocase of inner mitochondrial membrane 8 homolog A