KCNQ5 and bipolar disorder: KCNQ5 (potassium voltage-gated channel subfamily KQT member 5) may contribute to episodic disturbances of mood and behavior as well-characterized roles in other ion-channelopathies [25], and two family members, KCNC2 and KCNQ2, were found to be associated with bipolar disorder [9], [26].