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Mitochondrial Gene Transfer Ribonucleic Acid (tRNA)^Leu(UUR) 3243 and tRNA^Lys 8344 Mutations and Diabetes Mellitus in Korea

Division of Endocrinology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea

Address all correspondence and requests for reprints to: Dr. Hyun Chul Lee, Division of Endocrinology, Department of Internal Medicine, Yonsei University College of Medicine, 134 Shinchondong, Sudaemungu, Seoul 120–752, Korea.

The high prevalence of diabetic patients with a mutation in the mitochondrial gene (the 3243 and 8344 bp mutations) has been identified in Japan. To determine the prevalence of diabetic patients with those mutations in Korea, we randomly screened selected 503 clinical diabetic patients regardless of their diabetes types. We found only 1 patient with the mitochondrial DNA mutation at position 3243 (percent mutation, 32%), and the mitochondrial DNA mutation at position 8344 was not found in any of the patients. The affected subject was a 22-yr-old man with a history of myoclonic epilepsy and mild sensorineural hearing loss, a 1-yr duration of diabetes mellitus, and a low level C peptide response to oral glucose. Because of the low frequency of these mutations in the Korean diabetic population, we concluded that these particular mutations of mitochondrial DNA may not be a common contributor to diabetes mellitus in Korea.

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