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Molecular scanning of the insulin receptor substrate-1 (IRS-1) gene in Japanese patients with NIDDM: identification of five novel polymorphisms

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Summary

Since the insulin receptor substrate-1 (IRS-1) is the major substrate of the insulin receptor tyrosine kinase and has been shown to activate phosphatidylinositol (PI) 3-kinase and promote GLUT4 translocation, the IRS-1 gene is a potential candidate for development of non-insulin-dependent diabetes mellitus (NIDDM). In this study, we have identified IRS-1 gene polymorphisms, evaluated their frequencies in Japanese subjects, and analysed the contribution of these polymorphisms to the development of NIDDM. The entire coding region of the IRS-1 gene of 94 subjects (47 NIDDM and 47 control subjects) was screened by polymerase chain reaction-single stranded conformation polymorphism (PCR-SSCP) analysis. Seven SSCP polymorphisms were identified. These corresponded to two previously identified polymorphisms [Gly971→Arg (GGG→AGG) and Ala804 (GCA→GCG)] as well as five novel polymorphisms [Pro190→Arg (CCC→CGC), Met209→Thr (ATG→ACG), Ser809→Phe (TCT→TTT), Leu142 (CTT→CTC), and Gly625 (GGC→GGT)]. Although the prevalence of each of these polymorphisms was not statistically different between NIDDM and control subjects, the prevalence of the four IRS-1 polymorphisms with an amino acid substitution together was significantly higher in NIDDM than in control subjects (23.4 vs 8.5%, p<0.05), and two substitutions (Met209→Thr and Ser809→Phe) were found only in NIDDM patients. Equilibrium glucose infusion rates during a euglycaemic clamp in NIDDM and control subjects with the IRS-1 polymorphisms decreased by 29.5 and 22.0%, respectively on the average when compared to those in comparable groups without polymorphisms, although they were not statistically significant. Thus, IRS-1 polymorphisms may contribute in part to the insulin resistance and development of NIDDM in Japanese subjects; however, they do not account for the major part of the decrease in insulin-stimulated glucose uptake which is observed in subjects with clinically apparent NIDDM.

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Abbreviations

NIDDM:

Non-insulin-dependent diabetes mellitus

IRS-1:

insulin receptor substrate-1

SSCP:

single-stranded conformation polymorphisms

PCR:

polymerase chain reaction

RT-PCR:

reverse transcriptase-polymerase chain reaction

Pro:

proline

Arg:

arginine

Ser:

serine

Phe:

phenylalanine

Met:

methionine

Thr:

threonine

Gly:

glycine

Leu:

leucine

Ala:

alanine

GIR:

glucose infusion rate

PI:

phosphatidylinositol

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Ura, S., Araki, E., Kishikawa, H. et al. Molecular scanning of the insulin receptor substrate-1 (IRS-1) gene in Japanese patients with NIDDM: identification of five novel polymorphisms. Diabetologia 39, 600–608 (1996). https://doi.org/10.1007/BF00403308

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  • DOI: https://doi.org/10.1007/BF00403308

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