ClinVar Miner

Submissions for variant NM_001999.4(FBN2):c.791G>A (p.Gly264Asp)

gnomAD frequency: 0.00001  dbSNP: rs746046058
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000519364 SCV000621360 uncertain significance not provided 2017-10-03 criteria provided, single submitter clinical testing The G264D variant in the FBN2 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The G264D variant is not observed in large population cohorts (Lek et al., 2016). The G264D 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 that is conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret G264D as a variant of uncertain significance.
Invitae RCV001853684 SCV002302850 uncertain significance Congenital contractural arachnodactyly 2023-12-23 criteria provided, single submitter clinical testing This sequence change replaces glycine, which is neutral and non-polar, with aspartic acid, which is acidic and polar, at codon 264 of the FBN2 protein (p.Gly264Asp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with FBN2-related conditions. ClinVar contains an entry for this variant (Variation ID: 452545). 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 FBN2 protein function with a positive predictive value of 80%. 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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