ClinVar Miner

Submissions for variant NM_172107.4(KCNQ2):c.830C>A (p.Thr277Asn)

dbSNP: rs1600755607
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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 RCV000823209 SCV000964058 likely pathogenic Early infantile epileptic encephalopathy with suppression bursts 2022-11-29 criteria provided, single submitter clinical testing This sequence change replaces threonine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 277 of the KCNQ2 protein (p.Thr277Asn). This variant is not present in population databases (gnomAD no frequency). 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. This variant disrupts the p.Thr277 amino acid residue in KCNQ2. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 30182498). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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 KCNQ2 protein function. ClinVar contains an entry for this variant (Variation ID: 665007). This missense change has been observed in individual(s) with clinical features of KCNQ2-related conditions (Invitae).

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