ClinVar Miner

Submissions for variant NM_014191.4(SCN8A):c.4936A>T (p.Met1646Leu) (rs796053223)

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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000189284 SCV000242916 likely pathogenic not provided 2016-02-16 criteria provided, single submitter clinical testing The M1646L variant in the SCN8A gene has not been published as a pathogenic variant, nor has it been reported as a benign polymorphism to our knowledge. The M1646L variant was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The M1646L variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. This substitution occurs at a position that is conserved across species. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. A missense variant in a nearby residue (M1645I) has been reported in the Human Gene Mutation Database in association with an SCN8A-related disorder (Stenson et al., 2014), supporting the functional importance of this region of the protein. The M1646L variant is a strong candidate. However the possibility it may be a rare benign variant cannot be excluded.

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