CLCN1 (Chloride Voltage-Gated Channel 1) is a Protein Coding gene. Diseases associated with CLCN1 include Myotonia Congenita, Recessive and Myotonia Congenita, Dominant The protein encoded by CLCN1 regulates the electric excitability of the skeletal muscle membrane. Mutations in CLCN1 cause two forms of inherited human muscle disorders: recessive generalized myotonia congenita (Becker) and dominant myotonia (Thomsen). Alternative splicing results in multiple transcript variants.