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Hypertension 1997-Aug

Asp905Tyr polymorphism of protein phosphatase 1 G subunit gene in hypertension.

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G Q Shen
H Ikegami
T Fujisawa
Y Hamada
K Kamide
H Rakugi
J Higaki
H Murakami
K Shimamoto
T Ogihara

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Abstracto

A possible pathogenic polymorphism in the gene for the G subunit of the glycogen-associated regulatory form of protein phosphatase 1 (PP1 G subunit), causing an Asp-to-Tyr substitution at codon 905 (Asp905Tyr), has been reported to be associated with insulin resistance and hypersecretion of insulin in the white population. Since marked heterogeneity has been reported in the association of mutations of candidate genes with essential hypertension between Japanese and other ethnic groups, we investigated the association of Asp905Tyr with essential hypertension in Japanese subjects. The frequency of the Tyr allele in Japanese control subjects (0.70) was much higher than that in the Danish population (0.10, P<1x10(-8)), indicating that the Tyr allele, previously reported as a rare variant in white subjects, is a common allele in our population. The genotype distribution in Japanese hypertensive patients (n=109; Asp/Asp=0.09, Asp/Tyr=0.39, Tyr/Tyr=0.52) was not significantly different (chi2=0.7, df=2, P>.6) from that in normotensive control subjects (n=148; Asp/Asp=0.12, Asp/Tyr=0.36, Tyr/Tyr=0.52). Among subjects with different PP1 G subunit genotypes, there was no difference in blood pressure, serum cholesterol, plasma glucose and insulin levels, and glucose disposal rate estimated by the euglycemic hyperinsulinemic clamp test. These data indicate that the Asp905Tyr polymorphism of the PP1 G subunit is not associated with essential hypertension, nor with insulin resistance and/or hyperinsulinemia in Japanese patients with essential hypertension, suggesting that the polymorphism plays little if any role in susceptibility to insulin resistance or hypertension.

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