Chloride channel protein 4 (CLCN4)

Chloride channel protein 4 (CLCN4) is a member of the CLC family of chloride channels and chloride/proton exchangers. It is primarily an electrogenic H(+)/Cl(-) exchanger that mediates the exchange of chloride ions for protons across intracellular membranes, especially in endosomal and organellar compartments. CLCN4 is highly expressed in the brain and is thought to play roles in ion homeostasis, endosomal pH regulation, and intracellular trafficking. Mutations in CLCN4 are associated with X-linked neurodevelopmental disorders including intellectual disability, early-onset epilepsy, behavioral and movement disorders, and microcephaly. The CLCN4 gene is located on the X chromosome at Xp22.3, and both loss- and gain-of-function mutations have been observed in patients, leading to complex clinical phenotypes. As of now, no drugs are approved that specifically modulate CLCN4, and it is considered an emerging target for rare genetic disorders rather than for common, druggable diseases.

Other names

H(+)/Cl(-) exchange transporter 4ClC-4CLC4ClC-4Achloride transporter ClC-4MRX15MRX49MRXSRCchloride channel 4voltage-sensitive chloride channel 4

Not applicable (no known drugs); theoretical mechanisms would involve modulation of chloride–proton antiport activity