학술논문
A novel heteroplasmic tRNASer(UCN) mtDNA point mutation associated with progressive external ophthalmoplegia and hearing loss
Document Type
Article
Author
Source
Subject
*EYE paralysis
*DNA
*GENES
*CLINICAL pathology
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Language
ISSN
0960-8966
Abstract
Abstract: We sequenced all mitochondrial tRNA genes from a patient with sporadic external ophthalmoplegia (PEO) and 5% COX-negative fibers in muscle biopsy, who had no detectable large mtDNA deletions. Direct sequencing showed a heteroplasmic mutation at nucleotide 7506 in the dihydrouridine stem of the tRNASer(UCN) gene. RFLP analysis confirmed that 30% of muscle and 20% of urinary epithelium mtDNA harbored the mutation, which was absent in other tissues of the proband as well as in mtDNA of his mother and 100 patients with various encephalomyopathies. Several point mutations on mitochondrial tRNA genes have been reported in PEO patients without large-scale rearrangements of mtDNA but no point mutations have hitherto been found in the gene coding for tRNASer(UCN). [Copyright &y& Elsevier]