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To evaluate the role of mutations in the glucose transporter (GLUT1) gene in Japanese patients with non-insulin-dependent diabetes mellitus (NIDDM), we first conducted a population association study using the XbaI polymorphism of the gene. A polymerase chain reaction (PCR)-based assay was developed and used for the analysis. When analysed in 91 diabetic patients and 87 non-diabetic control subjects, the distribution of the genotype frequency was significantly different between the two groups (p = 0.0025). The (-) allele was significantly associated with NIDDM (odds ratio 2.317, 95% confidence interval 1.425-3.768). To identify possible mutation(s) in the GLUT1 gene, which was in linkage disequilibrium with the (-) allele, all ten exons of the gene were analysed by PCR single-strand conformation polymorphism (SSCP) analysis in 53 diabetic patients with at least one (-) allele. Variant SSCP patterns were detected in exons 2, 4, 5, 7, 9 and 10. Sequence analysis revealed that all the variants represented silent mutations. One of the variants in exon 2, GCT (Ala15)--&gt;GCC(Ala), created a HaeIII restriction site. This polymorphism was common in Japanese subjects with heterozygosity of 0.36 and polymorphism information content 0.29. We conclude that the structural mutation of GLUT1 is rare and not likely to be a major genetic determinant of NIDDM in Japanese subjects. The XbaI (-) allele of the GLUT1 gene appeared to be a genetic marker of NIDDM in Japanese subjects. The possibility of the presence of mutation(s) in the regulatory region of the gene or in another locus nearby could not be excluded.

HepG2/erythrocyte glucose transporter (GLUT1) gene in NIDDM: a population association study and molecular scanning in Japanese subjects