Two K2P potassium channels from different subfamilies pair up, producing hybrid channels with distinct drug responses
- TREK-1 and TASK-4, potassium channels from separate K2P subfamilies that are found together in heart and pancreatic beta cells, can assemble into mixed channels.
- Using oocyte voltage-clamp, excised-patch recordings and imaging/surface-expression assays, the hybrids showed altered pH, temperature and sodium sensitivity.
- Unlike TREK-1, the hybrids escape inhibition through Gs-coupled signalling and respond differently to drugs, suggesting new angles for arrhythmia and diabetes therapy.
💡 Points Based on the abstract
Oocyte expression is a forgiving system: you force a 1:1 co-injection, then ask whether heteromers form. Missing is any sign they exist natively in cardiomyocytes or beta cells, which needs co-IP or proximity ligation from primary tissue, plus a heteromer-selective blocker or knockout to prove function. Without that, the drug-response differences are a screening curiosity, not a target. Next step: native currents in isolated cells.