A functional polymorphism of the Galphaq (GNAQ) gene is associated with accelerated mortality in African-American heart failure.

Abstract:

:Galphaq, encoded by the human GNAQ gene, is an effector subunit of the Gq heterotrimeric G-protein and the convergence point for signaling of multiple Gq-coupled neurohormonal receptors. To identify naturally occurring mutations that could modify GNAQ transcription, we examined genomic DNA isolated from 355 normal subjects for genetic variants in transcription factor binding motifs. Of seven variants identified, the most common was a GC to TT dinucleotide substitution at -694/-695 (allele frequency of 0.467 in Caucasians and 0.329 in African Americans) within a GC-rich domain containing consensus binding sites for Sp-1, c-rel and EGR-1. In promoter-reporter analyses, the TT substitution increased promoter activity in cultured neonatal rat cardiac myocytes and human HEK fibroblasts by approximately 30% at baseline and after stimulation with phorbol ester. Two other relatively common polymorphisms, -173G/A and -168G/A, did not affect promoter activity. Since altered expression/activity of Galphaq is implicated in heart disease, we re-sequenced the GNAQ promoter in 1052 prospectively followed heart failure patients. The TT variant was not increased in heart failure, but was associated with decreased survival time among African Americans, with an adjusted RR of death/cardiac transplant of 1.95 (95% CI = 1.21-3.13) for heterozygotes and 2.4 (95% CI = 1.36-4.26) for homozygotes. Gel mobility shift assays showed that this GC/TT substitution eliminated Sp-1 binding without affecting c-rel or EGR-1 binding to this promoter fragment. Thus, the GNAQ -694/-695 promoter polymorphism alters transcription factor binding, increases promoter activity and adversely affects outcome in human heart failure.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Liggett SB,Kelly RJ,Parekh RR,Matkovich SJ,Benner BJ,Hahn HS,Syed FM,Galvez AS,Case KL,McGuire N,Odley AM,Sparks L,Kardia SL,Dorn GW 2nd

doi

10.1093/hmg/ddm229

subject

Has Abstract

pub_date

2007-11-15 00:00:00

pages

2740-50

issue

22

eissn

0964-6906

issn

1460-2083

pii

ddm229

journal_volume

16

pub_type

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