ClinVar Miner

Submissions for variant NM_000083.3(CLCN1):c.1484G>A (p.Gly495Glu)

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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 RCV003797318 SCV004588206 likely pathogenic Congenital myotonia, autosomal recessive form; Congenital myotonia, autosomal dominant form 2023-11-07 criteria provided, single submitter clinical testing This sequence change replaces glycine, which is neutral and non-polar, with glutamic acid, which is acidic and polar, at codon 495 of the CLCN1 protein (p.Gly495Glu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with myotonia congenita (Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. 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%. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic.

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