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Mitochondrial dysfunction in a novel form of autosomal recessive ataxia
journal contribution
posted on 2023-05-17, 15:13 authored by Murad, NAA, Cullen, JK, McKenzie, M, Ryan, MT, Thorburn, D, Nuri GuvenNuri Guven, Kobayashi, J, Birrell, G, Yang, J, Dork, T, Becherel, O, Grattan-Smith, P, Lavin, MFDefects in the recognition and/or repair of damage to DNA are responsible for a sub-group of autosomal recessive ataxias. Included in this group is a novel form of ataxia with oculomotor apraxia characterised by sensitivity to DNA damaging agents, a defect in p53 stabilisation, oxidative stress and resistance to apoptosis. We provide evidence here that the defect in this patient's cells is at the level of the mitochondrion. Mitochondrial membrane potential was markedly reduced in cells from the patient and ROS levels were elevated. This was accompanied by lipid peroxidation of mitochondrial proteins involved in electron transport and RNA synthesis. However, no gross changes or alteration in composition or activity of mitochondrial electron transport complexes was evident. Sequencing of mitochondrial DNA revealed a mutation, I349T, in the mitochondrial cytochrome b gene. These results describe a patient with an apparently novel form of AOA characterised by a defect at the level of the mitochondrion.
History
Publication title
MitochondrionVolume
13Pagination
235-245ISSN
1872-8278Department/School
School of Pharmacy and PharmacologyPublisher
Elsevier BVPlace of publication
PO Box 211 Amsterdam, 1000 AE NetherlandsRights statement
Copyright 2012 Elsevier B.V. and Mitochondria Research SocietyRepository Status
- Restricted