Description
This missense variant replaces glycine with valine at codon 1319 of the SCN5A protein. This variant is also known as p.Gly1318Val in the literature based on a different NM_000335 transcript. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). This variant is found within a highly conserved region of the transmembrane domain III. Rare nontruncating variants in this region have been shown to be significantly overrepresented in individuals with long QT syndrome (PMID: 32893267). Functional studies have shown that this variant causes a significant reduction in sodium current (PMID: 17854786, 19251209). This variant has been reported in over ten unrelated individuals affected with Brugada syndrome (PMID: 12106943, 17854786, 19251209, 21273195, 24951569, 29759671, 30847666, 32893267, 36516610, ClinVar SCV000291807.6), in an individual affected with long QT syndrome (PMID: 32893267), and in two individuals affected with progressive cardiac conduction disorders (PMID: 30059973). This variant has been shown to segregates with disease in four first-degree relatives from two families affected with cardiac conduction disease and cardiomypoathy (PMID: 25179549, 28790152). This variant has been identified in 11/269654 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Based on the available evidence, this variant is classified as Likely Pathogenic.
# | Sample | Method | Observation |
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Origin | Affected | Number tested | Tissue | Purpose | Method | Individuals | Allele frequency | Families | Co-occurrences |
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1 | germline | unknown | 108544 | not provided | not provided | | 3 | not provided | not provided | not provided |