ClinVar Miner

Submissions for variant NM_000083.3(CLCN1):c.598G>A (p.Gly200Arg)

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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Labcorp Genetics (formerly Invitae), Labcorp RCV003062144 SCV003440226 pathogenic Congenital myotonia, autosomal recessive form; Congenital myotonia, autosomal dominant form 2023-11-03 criteria provided, single submitter clinical testing This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 200 of the CLCN1 protein (p.Gly200Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal dominant myotonia congenita (PMID: 8571958, 9703437). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 2136616). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt CLCN1 protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects CLCN1 function (PMID: 9703437, 22689570). For these reasons, this variant has been classified as Pathogenic.

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