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Synonyms
KCNK5; TASK2; Potassium channel subfamily K member 5; Acid-sensitive potassium channel protein TASK-2; TWIK-related acid-sensitive K(+ channel 2
KCNK5 is a pH-dependent, voltage-insensitive, outwardly rectifying potassium channel. Its outward rectification is lost at high external K(+) concentrations.
Gene References Into Functions
Mutations in the promoter region of the TWIK-related acid-sensitive K(+) channel 2 (TASK-2) gene did not result in hypertension or primary aldosteronism (PA) during long-term follow-up in healthy participants. Therefore, they do not appear to be a causal factor for PA. PMID: 29293917
Our study suggests a novel role for KCNK5 in regulating platelet size and maturity. Additionally, our findings confirm an association between the SH2B3-locus and platelet count. PMID: 28865245
In human aldosterone-producing adrenocortical cancer cell lines, roxithromycin inhibited KCNJ5MUT-induced induction of CYP11B2 (encoding aldosterone synthase) expression and aldosterone production. PMID: 28604387
HLA-DQB1*06:02 does not appear to be associated with hypoxic ventilatory response or hypercapnic ventilatory response. However, there are point-wise, uncorrected significant associations between two TASK2/KCNK5 variants (rs2815118 and rs150380866) and hypercapnic ventilatory response. PMID: 28045995
These results provide further structural and functional insights into the potential pathophysiological effects of this missense variant in TASK-2. PMID: 27228168
Results indicate that up-regulated KCNK5 in activated human T cells does not play a volume regulatory role due to decreased Cl- permeability. This suggests that KCNK5 upregulation might play a role in hyperpolarization of the cell membrane, leading to increased Ca2+ influx and proliferation of T cells. PMID: 26909737
The potassium channel TASK2 drives human NK-cell proliferation and cytolytic function. PMID: 26140335
Mutant genes (CELA1, HSPG2, and KCNK5) in Balkan endemic nephropathy patients encode proteins involved in basement membrane/extracellular matrix and vascular tone, which are closely linked to the process of angiogenesis. PMID: 24949484
Lower expression of the TASK-2 channel is a hallmark of aldosterone-producing adenoma causing aldosteronism and is associated with a higher expression of hsa-miR-23 and hsa-miR-34. PMID: 24285684
Potassium channels, particularly K2P channels, are expressed and functional in the apical membrane of airway epithelial cells. PMID: 21964404
Disease activity in rheumatoid arthritis patients strongly correlates with K(2P)5.1 expression levels in CD4+ T lymphocytes in the peripheral blood. PMID: 21314928
17beta-estradiol induces the expression of KCNK5 via ERalpha(+) in breast cancer cells. This channel plays a role in regulating proliferation in these cell lines. PMID: 21680658
Data suggest that the cytokine receptor-coupled JAK/STAT pathway is upstream of the swelling-induced phosphorylation and activation of TASK-2 in Ehrlich ascites tumor cells. PMID: 20631251
We have identified and characterized K2P5.1 as a critical player in T-cell effector function. Selective targeting of K(2P)5.1 may hold therapeutic promise for multiple sclerosis and potentially other T-cell-mediated disorders. PMID: 20582984
TASK-2 does not possess a histidine residue at the homologous position. Inclusion of such a residue failed to produce the expected increase in pH sensitivity; instead, a slight decrease was observed. PMID: 12634929
TASK-2 is not highly expressed in the cerebellum. PMID: 15197476
KCNK5 is involved in K(+)-channel activity in regulatory volume decrease in human spermatozoa. Channel activity is regulated beyond the extent of protein expression. PMID: 18157847
Two pore domain potassium channel (TC 1.A.1.8) family
Subcellular Location
Membrane; Multi-pass membrane protein.
Tissue Specificity
Abundant expression in kidney, also detected in liver, placenta and small intestine. In the kidney, expression is restricted to the distal tubules and collecting ducts. Not expressed in proximal tubules or glomeruli.
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