A NOVEL KCNJ5 GENE MUTATION ASSOCIATED WITH FAMILIAL ALDOSTERONISM TYPE III WITHOUT HYPERTENSION.

Authors

Meng-Yun Zhou, Shi-Qi Yu, Shao-Jie Zhu, Xiang Kong, Xin-Ming Yao

Published in

Georgian medical news. Issue 376-377. Pages 259-265.

Abstract

Primary aldosteronism (PA) involves excessive autonomous aldosterone (ALD) secretion by the adrenal cortex, leading to water and sodium retention and renin-angiotensin system inhibition, causing hypertension and K+ imbalance. Familial hyperaldosteronism type III (FH-III) is a rare subtype, characterized by hypokalemia with hypertension and adrenal hyperplasia. Eight associated pathogenic potassium inward rectifying channel protein subfamily J member 5 (KCNJ5) mutations have been reported. This study reports a Chinese family with FH-III associated with a rare KCNJ5 variant (c.536A>G, p.Asn179Ser), which has been previously reported in cardiac genetics databases (rs147070381). Our study expands its phenotypic spectrum to include familial aldosteronism.
A middle-aged female presented with recurrent hypokalemia unresponsive to oral potassium supplementation. She and her family underwent comprehensive clinical examination, biochemical testing, imaging studies, and whole-exome sequencing.
She exhibited recurrent hypokalemia without hypertension, with fluctuating ALD, which were controlled with spironolactone. The proband, along with her sister and mother, were found to carry a heterozygous KCNJ5 variant (exon 2: c.536A>G, p.Asn179Ser).
FH-III symptoms vary widely, making diagnosis challenging in patients who solely present with recurrent hypokalemia. Early gene sequencing facilitates accurate diagnosis to guide appropriate treatment.

PMID:
42830061
Bibliographic data and abstract were imported from PubMed on 05 Oct 2026.

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