Two Point Mutations Within the Adducin Genes Are Involved in Blood Pressure Variation

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1994 Apr 26

PMID 8171025

Citations 49

Authors

G Bianchi

G Tripodi

G Casari

S Salardi

B R Barber

R Garcia

P Leoni

L Torielli

D Cusi

M Ferrandi

Affiliations

Soon will be listed here.

Abstract

The Milan hypertensive strain of rats (MHS) develops a genetic form of renal hypertension that, when compared to its normotensive control (MNS), shows renal dysfunction similar to that of a subset of human patients with primary hypertension. MHS and MNS were shown to be homozygous by multilocus minisatellite analysis and monolocus microsatellite markers. We show here that one point mutation in each of two genes coding for the membrane skeleton protein adducin is associated with blood pressure in the Milan strain of rats. Adducin is a heterodimer formed by alpha and beta subunits that promotes the assembly of actin with spectrin. MHS and MNS differ, respectively, by the amino acids Y and F at position 316 of the alpha subunit. In the beta-adducin locus, MHS is always homozygous for R at position 529 while in MNS either R or Q occurs in that position. The R/Q heterozygotes showed lower blood pressure than any of the homozygotes. In vitro phosphorylation studies suggest that both of these amino acid substitutions occur within protein kinase recognition sites. Analysis of an F2 generation demonstrated that Y alleles segregated with a significant increment in blood pressure. This effect is modulated by the presence of the R allele of the beta subunit. Taken together, these findings strongly support a role for adducin polymorphisms in causing variation of blood pressure in the Milan strain of rats.

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