The Common Single Nucleotide Polymorphism E23K in KIR6.2 Sensitizes Pancreatic β-Cell ATP-Sensitive Potassium Channels Toward Activation Through Nucleoside Diphosphates
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E23K, a common polymorphism in the pore-forming subunit KIR6.2 of pancreatic β-cell ATP-sensitive K+ (KATP) channels, is functionally relevant and thus might play a major role in the pathophysiology of common type 2 diabetes. In this study, we show that in the simultaneous presence of activatory and inhibitory nucleotides, the polymorphism exerts opposite effects on the potencies of these modulators: channel opening through nucleoside diphosphates is facilitated, whereas sensitivity toward inhibition through ATP is slightly decreased. The results support the conclusion that E23K predisposes to type 2 diabetes by changing the channel’s response to physiological variation of cytosolic nucleotides, resulting in KATP overactivity and discrete inhibition of insulin release.
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A common variant in Kir6.2 (E23K) is associated with a slightly increased risk of T2DM, but its effects on KATP channel activity and insulin secretion are very small and controversial.
“Finally, a common variant in Kir6.2 (E23K) is associated with a slightly increased risk of T2DM (216, 586). While its effects on KATP channel activity (604, 605) and insulin secretion (696) are very small (585) and controversial (552), it is important to note that even a tiny increase in channel activity can lead to ND (705).”
From Pancreatic β-Cell Electrical Activity and Insulin Secretion: Of Mice and Men (2018) · cites this paper as [604]
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Pancreatic β-Cell Electrical Activity and Insulin Secretion: Of Mice and Men
Rorsman, P., & Ashcroft, F. M. (2018) · Physiological Reviews · doi:10.1152/physrev.00008.2017 · Cited by 793 · see citing works
- Authors
- Schwanstecher, C., Neugebauer, B., Schulz, M., & Schwanstecher, M.
- Affiliations
- Technische Universität Braunschweig (DE)
- Venue
- Diabetes
- Publisher
- American Diabetes Association
- Published
- 2002-12-01
- Volume
- 51
- Issue
- suppl_3
- Pages
- S363-S367
- ISSN
- 0012-1797 (ISSN-L)
- 1939-327X
- OpenAlex
- W2164720600
- Cited by
- 62
- References
- 28
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 2 · 2021: 1 · 2018: 2 · 2017: 4 · 2016: 4 · 2015: 3 · 2014: 2 · 2013: 3 · 2012: 1
- FWCI
- 5.08
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Diabetes (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Deutsche Forschungsgemeinschaft
- Topics
- Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
- Keywords
- Kir6.2, E23K polymorphism, ATP-sensitive potassium channels, pancreatic beta cells, nucleoside diphosphates, ATP, insulin secretion
- MeSH terms
- Adenosine Diphosphate, Adenosine Triphosphate, Animals, Guanosine Diphosphate, Humans, Islets of Langerhans, Molecular Sequence Data, Potassium Channels, COS Cells, Polymorphism, Single Nucleotide, Potassium Channels, Inwardly Rectifying
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