ClinVar Miner

Submissions for variant NM_000256.3(MYBPC3):c.67G>A (p.Ala23Thr)

gnomAD frequency: 0.00003  dbSNP: rs758044508
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV001042349 SCV001206026 uncertain significance Hypertrophic cardiomyopathy 2021-08-27 criteria provided, single submitter clinical testing This sequence change replaces alanine with threonine at codon 23 of the MYBPC3 protein (p.Ala23Thr). The alanine residue is highly conserved and there is a small physicochemical difference between alanine and threonine. This variant is present in population databases (rs758044508, ExAC 0.01%). This variant has not been reported in the literature in individuals affected with MYBPC3-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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.
Color Diagnostics, LLC DBA Color Health RCV001192141 SCV001360123 uncertain significance Cardiomyopathy 2021-02-19 criteria provided, single submitter clinical testing This missense variant replaces alanine with threonine at codon 23 of the MYBPC3 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with cardiovascular disorders in the literature. This variant has been identified in 8/268284 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The 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.

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