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CLCN2 Chloride Channel Mutations in Familial Hyperaldosteronism Type II

ABSTRACT: CLCN2 Chloride Channel Mutations in Familial Hyperaldosteronism Type II

PROVIDER: PRJNA418853 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6300660.fastq.gz	Fastqsanger.gz
	SRR6300661.fastq.gz	Fastqsanger.gz
	SRR6300662.fastq.gz	Fastqsanger.gz
	SRR6300663.fastq.gz	Fastqsanger.gz
	SRR6300664.fastq.gz	Fastqsanger.gz

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CLCN2 Chloride Channel Mutations in Familial Hyperaldosteronism Type II

Project description:Primary aldosteronism (PA), a common cause of severe hypertension, features constitutive production of the adrenal steroid aldosterone. We analyzed a multiplex family with familial hyperaldosteronism type II (FH-II) and 80 additional probands with unsolved early-onset PA. Eight probands had novel heterozygous variants in CLCN2, including two de novo mutations and four independent occurrences of the identical p.Arg172Gln mutation; all relatives with early-onset PA carried the CLCN2 variant found in probands. CLCN2 encodes a voltage-gated chloride channel expressed in adrenal glomerulosa that opens at hyperpolarized membrane potentials. In this data set, we examined RNA expression in H295R cells transfected with empty vector, WT and p.Arg172Gln CLCN2. Expression of CLCN2 led to increased expression of CYP11B2 and its upstream regulator NR4A2.

2017-12-08 | GSE107030 | GEO

CLCN2 chloride channel mutations in familial hyperaldosteronism type II.

Project description:Primary aldosteronism, a common cause of severe hypertension 1 , features constitutive production of the adrenal steroid aldosterone. We analyzed a multiplex family with familial hyperaldosteronism type II (FH-II) 2 and 80 additional probands with unsolved early-onset primary aldosteronism. Eight probands had novel heterozygous variants in CLCN2, including two de novo mutations and four independent occurrences of a mutation encoding an identical p.Arg172Gln substitution; all relatives with early-onset primary aldosteronism carried the CLCN2 variant found in the proband. CLCN2 encodes a voltage-gated chloride channel expressed in adrenal glomerulosa that opens at hyperpolarized membrane potentials. Channel opening depolarizes glomerulosa cells and induces expression of aldosterone synthase, the rate-limiting enzyme for aldosterone biosynthesis. Mutant channels show gain of function, with higher open probabilities at the glomerulosa resting potential. These findings for the first time demonstrate a role of anion channels in glomerulosa membrane potential determination, aldosterone production and hypertension. They establish the cause of a substantial fraction of early-onset primary aldosteronism.

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Project description:Taste substances are received by taste receptors expressed in taste cells. “Salty taste” sensation is evoked when sodium and chloride ions are present together in the oral cavity. The presence of an epithelial cation channel that receives Na+ has previously been reported. However, no molecular entity involving Cl- receptors has been elucidated. We report the strong expression of transmembrane channel-like 4 (TMC4) in the circumvallate and foliate papillae projected to the glossopharyngeal nerve, mediating a high-concentration of NaCl. Electrophysiological analysis using HEK293T cells revealed that TMC4 was a voltage-dependent Cl- channel and the consequent currents were completely inhibited by NPPB, an anion channel blocker. This channel could be activated without an increase in intracellular calcium ion. TMC4 allowed permeation of organic anions including gluconate, but their current amplitudes at positive potentials were less than that of Cl-. Tmc4-deficient mice showed significantly weaker glossopharyngeal nerve response to high-concentration of NaCl than the wild-type littermates. These results indicated that TMC4 is a novel chloride channel that responds to high-concentration of NaCl.

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TMC4 is a novel chloride channel involved in high-concentration salt taste sensation

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