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  • Title: Mutations in the glucokinase gene are not a major cause of late-onset type 2 (non-insulin-dependent) diabetes mellitus in Japanese subjects.
    Author: Nishi S, Hinata S, Matsukage T, Takeda J, Ichiyama A, Bell GI, Yoshimi T.
    Journal: Diabet Med; 1994 Mar; 11(2):193-7. PubMed ID: 8200206.
    Abstract:
    The role of the glucokinase gene in the development of diabetes in a group of 349 Japanese subjects with late-onset Type 2 diabetes was examined. These diabetic subjects and 197 non-diabetic controls were typed at two simple tandem repeat DNA polymorphisms in the glucokinase gene termed GCK2 and GCK3. Six and five alleles were evident in Japanese subjects at GCK2 and GCK3, respectively. There were no significant differences in allele, genotype or haplotype frequencies between diabetic and normal groups. In addition, the glucokinase gene of 340 diabetic and 170 non-diabetic Japanese subjects was screened for mutations using single strand conformation polymorphism analysis. Four nucleotide substitutions were identified: a silent substitution in exon 4 in the codon for proline 145 (CCC-->CCG), and A-->T, C-->G, and C-->A substitutions in introns 1b, 3, and 5, respectively. There were no significant differences in the frequencies of these nucleotide substitutions between diabetic and non-diabetic groups. These results suggest that glucokinase gene defects are not a major cause of late-onset Type 2 diabetes in Japanese subjects.
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