ClinVar Miner

Submissions for variant NM_000218.3(KCNQ1):c.491T>C (p.Val164Ala)

dbSNP: rs1848316801
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Color Diagnostics, LLC DBA Color Health RCV001843151 SCV001348766 uncertain significance Cardiac arrhythmia 2019-04-02 criteria provided, single submitter clinical testing This missense variant replaces valine with alanine at codon 164 of the KCNQ1 protein. Computational prediction tools and conservation analyses suggest that this variant may have deleterious impact on the protein function. Computational splicing tools suggest that this variant may not impact RNA splicing. To our knowledge, functional assays have not been performed for this variant nor has this variant been reported in individuals affected with cardiovascular disorders in the literature. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.
Invitae RCV002559819 SCV003461922 uncertain significance Long QT syndrome 2023-11-05 criteria provided, single submitter clinical testing This sequence change replaces valine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 164 of the KCNQ1 protein (p.Val164Ala). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with KCNQ1-related conditions. ClinVar contains an entry for this variant (Variation ID: 922815). 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 with a positive predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

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