Impairment of mitochondrial tRNAIle processing by a novel mutation associated with chronic progressive external ophthalmoplegia

Schaller, A; Desetty, R; Hahn, D; Jackson, C B; Nuoffer, J-M; Gallati, S; Levinger, L (2011). Impairment of mitochondrial tRNAIle processing by a novel mutation associated with chronic progressive external ophthalmoplegia. Mitochondrion, 11(3), pp. 488-96. Amsterdam: Elsevier 10.1016/j.mito.2011.01.005

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We report a sporadic case of chronic progressive external ophthalmoplegia associated with ragged red fibers. The patient presented with enlarged mitochondria with deranged internal architecture and crystalline inclusions. Biochemical studies showed reduced activities of complex I, III and IV in skeletal muscle. Molecular genetic analysis of all mitochondrial tRNAs revealed a G to A transition at nt 4308; the G is a highly conserved nucleotide that participates in a GC base-pair in the T-stem of mammalian mitochondrial tRNA(Ile). The mutation was detected at a high level (approx. 50%) in muscle but not in blood. The mutation co-segregated with the phenotype, as the mutation was absent from blood and muscle in the patient's healthy mother. Functional characterization of the mutation revealed a six-fold reduced rate of tRNA(Ile) precursor 3' end maturation in vitro by tRNAse Z. Furthermore, the mutated tRNA(Ile) displays local structural differences from wild-type. These results suggest that structural perturbations reduce efficiency of tRNA(Ile) precursor 3' end processing and contribute to the molecular pathomechanism of this mutation.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine 04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Institute of Clinical Chemistry
UniBE Contributor:	Schaller, André, Hahn, Dagmar Karen, Jackson, Christopher, Nuoffer, Jean-Marc, Gallati, Sabina
ISSN:	1567-7249
Publisher:	Elsevier
Language:	English
Submitter:	Anette van Dorland
Date Deposited:	04 Oct 2013 14:24
Last Modified:	05 Dec 2022 14:07
Publisher DOI:	10.1016/j.mito.2011.01.005
PubMed ID:	21292040
Web of Science ID:	000289763500015
URI:	https://boris.unibe.ch/id/eprint/8320 (FactScience: 213839)