ClinVar Miner

Submissions for variant NM_000083.3(CLCN1):c.434-55_464del

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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 RCV003804615 SCV004606519 pathogenic Congenital myotonia, autosomal recessive form; Congenital myotonia, autosomal dominant form 2023-09-12 criteria provided, single submitter clinical testing This variant results in the deletion of part of exon 4 (c.434-55_464del) of the CLCN1 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in CLCN1 are known to be pathogenic (PMID: 17932099, 22094069, 23739125). This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with clinical features of myotonia congenita (Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic.

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