ClinVar Miner

Submissions for variant NM_006218.4(PIK3CA):c.2077C>T (p.Arg693Cys)

gnomAD frequency: 0.00001  dbSNP: rs1060500029
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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 RCV000468341 SCV000541316 uncertain significance Cowden syndrome 2016-10-09 criteria provided, single submitter clinical testing This sequence change replaces arginine with cysteine at codon 693 of the PIK3CA protein (p.Arg693Cys). The arginine residue is highly conserved and there is a large physicochemical difference between arginine and cysteine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a PIK3CA-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies. In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance.

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