ClinVar Miner

Submissions for variant NM_139241.3(FGD4):c.955C>T (p.Arg319Cys) (rs1131691854)

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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000493204 SCV000583005 uncertain significance not provided 2017-05-18 criteria provided, single submitter clinical testing A variant of uncertain significance has been identified in the FGD4 gene. The R319C variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The R319C variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The R319C variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position where amino acids with similar properties to Arginine are tolerated across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. Based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant.
Invitae RCV000654160 SCV000776050 uncertain significance Charcot-Marie-Tooth disease type 4 2017-12-19 criteria provided, single submitter clinical testing This sequence change replaces arginine with cysteine at codon 319 of the FGD4 protein (p.Arg319Cys). 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). This variant has not been reported in the literature in individuals with FGD4-related disease. ClinVar contains an entry for this variant (Variation ID: 430243). 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 and their clinical significance is uncertain. 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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