KCNG3 is a regulatory subunit of voltage-gated potassium channels that functions as a modifier of channel kinetics rather than forming functional channels independently. KCNG3 assembles with Kv2.1 (KCNB1) or Kv2.2 (KCNB2) to form heteromeric Kv2/KvS channels, which can be pharmacologically distinguished from Kv2-only channels by their resistance to RY785 pore-blocker while remaining sensitive to guangxitoxin-1E 12. The protein modulates potassium ion efflux and appears to regulate macrophage polarization through ASK1 activation, with KCNG3 knockdown promoting M1 polarization and enhancing inflammatory responses 3. KCNG3 is expressed in various tissues including neurons, interstitial cells of Cajal, and smooth muscle, with significant downregulation observed in Hirschsprung's disease suggesting a role in gastrointestinal motility 4. The gene shows altered methylation patterns in various cancers including lung adenocarcinomas and gastric cancer, where it functions as an oncogenic target of tumor suppressor miR-148a-5p 56. Additionally, KCNG3 is overexpressed in prostate cancer and shows potential gender-specific methylation differences in schizophrenia 78.