Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1 is a protein that in humans is encoded by the HCN1 gene. Function Hyperpolarization-activated cation channels of the HCN gene family, such as HCN1, contribute to spontaneous rhythmic activity in both heart and brain. Tissue distribution HCN1 channel expression is found in the sinoatrial node, the neocortex, hippocampus, cerebellar cortex, dorsal root ganglion, trigeminal ganglion and brainstem. Interactions HCN1 has been shown to interact with HCN2. Epilepsy De novo mutations in HCN1 cause epilepsy. See also Cyclic nucleotide-gated ion channel References Further reading External links Ion channels