ClinVar Miner

Submissions for variant NM_001330260.2(SCN8A):c.765G>T (p.Met255Ile)

dbSNP: rs1941650264
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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV001051151 SCV001215291 likely pathogenic Early infantile epileptic encephalopathy with suppression bursts 2020-05-04 criteria provided, single submitter clinical testing This variant has been observed in individual(s) with clinical features of early infantile epileptic encephalopathy (Invitae). In at least one individual the variant was observed to be de novo. 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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant is not present in population databases (ExAC no frequency). This sequence change replaces methionine with isoleucine at codon 255 of the SCN8A protein (p.Met255Ile). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and isoleucine.

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