Subunit of ATP-sensitive potassium channels (KATP). Can form cardiac and smooth muscle-type KATP channels with KCNJ11. KCNJ11 forms the channel pore while ABCC9 is required for activation and regulation. Interacts with KCNJ11. The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. May contribute to the regulation of sleep duration. An intronic variant of this gene may account for about 5% of the variation of sleep duration between individuals (PubMed:22105623). Sleep duration is influenced both by environmental and genetic factors, with an estimated heritability of about 40%. Numerous genes are expected to contribute to the regulation of sleep duration. Belongs to the ABC transporter superfamily. ABCC family. Conjugate transporter (TC 3.A.1.208) subfamily. On The Other Side - Issue 139 of June 2012 Database for mutations in ABC proteins