CLCN1

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Chloride channel, voltage-sensitive 1
Identifiers
Symbols CLCN1 ; CLC1
External IDs OMIM118425 MGI88417 HomoloGene63 IUPHAR: ClC-1 GeneCards: CLCN1 Gene
RNA expression pattern
PBB GE CLCN1 208437 at tn.png
More reference expression data
Orthologs
Species Human Mouse
Entrez 1180 12723
Ensembl ENSG00000188037 ENSMUSG00000029862
UniProt P35523 Q64347
RefSeq (mRNA) NM_000083 NM_013491
RefSeq (protein) NP_000074 NP_038519
Location (UCSC) Chr 7:
143.01 – 143.05 Mb
Chr 6:
42.29 – 42.32 Mb
PubMed search [1] [2]

The CLCN family of voltage-dependent chloride channel genes comprises nine members (CLCN1-7, Ka and Kb) which demonstrate quite diverse functional characteristics while sharing significant sequence homology. The protein encoded by this gene regulates the electric excitability of the skeletal muscle membrane. Mutations in this gene cause two forms of inherited human muscle disorders: recessive generalized myotonia congenita (Becker) and dominant myotonia (Thomsen).[1]

Chloride channel protein, skeletal muscle (CLCN1) is a protein that in humans is encoded by the CLCN1 gene.[2] Mutations in this protein cause congenital myotonia.

CLCN1 is critical for the normal function of skeletal muscle cells. For the body to move normally, skeletal muscles must tense (contract) and relax in a coordinated way. Muscle contraction and relaxation are controlled by the flow of ions into and out of muscle cells. CLCN1 forms an ion channel that controls the flow of negatively charged chloride ions into these cells. The main function of this channel is to stabilize the cells' electrical charge, enabling muscles to contract normally.

In people with congenital myotonia due to a mutation in CLCN1, the ion channel admits too few chloride ions into the cell. This shortage of chloride ions causes prolonged muscle contractions, which are the hallmark of myotonia.


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References[edit]

  1. ^ "Entrez Gene: CLCN1 chloride channel 1, skeletal muscle (Thomsen disease, autosomal dominant)". 
  2. ^ Koch MC, Steinmeyer K, Lorenz C, Ricker K, Wolf F, Otto M, Zoll B, Lehmann-Horn F, Grzeschik KH, Jentsch TJ (Sep 1992). "The skeletal muscle chloride channel in dominant and recessive human myotonia". Science 257 (5071): 797–800. doi:10.1126/science.1379744. PMID 1379744. 

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This article incorporates text from the United States National Library of Medicine, which is in the public domain.