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Nucleic Acids Research, 1992, Vol. 20, No. 4 679-682
© 1992

Articles

Mutations In mitochondrial tRNA genes: non-linkage with syndromes of Wolfram and chronic progressive external ophthalmoplegiaa

Jody M.W. van den Ouweland, G. Jan Bruining1, Dick Lindhout2, Jan-Maarten Wit3, Bernard F.E. Veldhuyzen4 and J. Antonie Maassen*

Department of Medical Biochemistry, Sylvius Laboratories, University of Leiden, Rotterdam 1Departments of Paediatrics, Sophia Children Hospital/Academic Hospital Rotterdam, Erasmus University Rotterdam 2Departments of Cell Biology and Genetics, Sophia Children Hospital/Academic Hospital Rotterdam, Erasmus University Rotterdam 3Department of Paediatrics, University Hospital for Children and Youth 'Het Wilhelmina Kinderziekenhuis', University of Utrecht The Netherlands 4Department of Internal Diseases, Ignatius Hospital Breda The Netherlands

*To whom correspondence should be addressed

Received December 16, 1991. Revised January 20, 1992. Accepted January 20, 1992.

We have recently identified a point mutation in the mitochondrially encoded tRNALeu(UUR) gene which associates with a combination of type II diabetes mellitus and sensorineural hearing loss in a large pedigree. To extend this finding to other syndromes which exhibit a combination of diabetes mellitus and hearing loss we have sequenced all mitochondrial tRNA genes from two patients with the Wolfram syndrome, a rare congenital disease characterized by diabetes mellitus, deafness, diabetes insipidus and optic atrophy. In each patient, a single different mutation was identified. One Is an A to G transition mutation at np 12,308 in tRNALeu(CUN) gene in a region which Is highly conserved between species during evolution. This mutation has been described by Lauber et al. (1) as associating with chronic progressive external ophthalmoplegia (CPEO). The other is a C to T transition mutation at np 15,904 In tRNAThr gene. Both mutations are also present In the general population (frequency tRNALeu(CUN) mutation 0.16, tRNAThr mutation 0.015). These findings suggest that evolutionarily conserved regions in mitochondrial tRNA genes can exhibit a significant polymorphism in humans, and that the mutation at np 12,308 in the tRNALeu(CUN) gene is unlikely to be associated with CPEO and Wolfram syndrome.


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