Summary
We screened 214 Japanese NIDDM (non-insulin-dependent) diabetic patients with a family history of diabetes for mutations in the mitochondrial tRNALeu(UUR) gene using polymerase chain reaction-restriction fragment length polymorphism and direct sequencing. Six patients were identified as having an A to G transition at position 3243 (3243 mutation), but no patients were detected with a T to C transition at position 3271, in the mitochondrial tRNALeu(UUR) gene. These two mutations were not present in 85 healthy control subjects. It was disclosed that the patients' mothers were also affected by diabetes mellitus in five of the six cases. In these six affected patients, the 3243 mutation shows variable phenotypes, such as the degree of multiple organ involvement, intrafamilial and interfamilial differences in disease characteristics, and the degree of the involvement of MELAS (mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes) phenotype. Endocrinological examinations revealed that those diabetic patients with the 3243 mutation show not only beta-cell dysfunction, but also a defect in alpha-cell function, which is considered characteristic of diabetes with the 3243 mutation. When compared with 50 selected diabetic control subjects without the 3243 mutation, whose mothers, but not fathers, were found to have diabetes, it was established statistically that those with the 3243 mutation possess the following clinical characteristics; 1) the age of diabetes onset is lower, 2) they have lean body constitutions, and 3) they are more likely to be treated with insulin than control subjects. We suggest that diabetes with the 3243 mutation possesses phenotypes distinct from those in common forms of diabetes.
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Abbreviations
- NIDDM:
-
non-insulin-dependent diabetes mellitus
- IDDM:
-
insulin-dependent diabetes mellitus
- MELAS:
-
mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes
- PCR:
-
polymerase chain reaction
- RFLP:
-
restriction fragment length polymorphism
- BMI:
-
body mass index
- ICA:
-
islet cell antibody
- ICSA:
-
islet cell surface antibody
- GAD:
-
glutamic acid decarboxylase
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Kishimoto, M., Hashiramoto, M., Araki, S. et al. Diabetes mellitus carrying a mutation in the mitochondrial tRNALeu(UUR) gene. Diabetologia 38, 193–200 (1995). https://doi.org/10.1007/BF00400094
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DOI: https://doi.org/10.1007/BF00400094