ClinVar Miner

Submissions for variant NM_000218.3(KCNQ1):c.1018T>C (p.Phe340Leu)

dbSNP: rs2133750942
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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 RCV001976987 SCV002274564 likely pathogenic Long QT syndrome 2023-06-23 criteria provided, single submitter clinical testing 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 KCNQ1 protein function. 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. Experimental studies have shown that this missense change affects KCNQ1 function (PMID: 32004091). ClinVar contains an entry for this variant (Variation ID: 1488375). This missense change has been observed in individuals with long QT syndrome (PMID: 26496715, 29497013, 32004091). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces phenylalanine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 340 of the KCNQ1 protein (p.Phe340Leu).

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