ClinVar Miner

Submissions for variant NM_000138.5(FBN1):c.297G>A (p.Met99Ile)

gnomAD frequency: 0.00001  dbSNP: rs1314594090
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV001587729 SCV001814773 uncertain significance not provided 2019-04-15 criteria provided, single submitter clinical testing Not observed in large population cohorts (Lek et al., 2016); Does not affect a cysteine residue within a calcium-binding EGF-like domain of the FBN1 gene; cysteine substitutions in the calcium-binding EGF-like domains represent the majority of pathogenic missense changes associated with FBN1 related disorders (Collod-Beroud et al., 2003).; In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge
Fulgent Genetics, Fulgent Genetics RCV002501940 SCV002787792 uncertain significance Ectopia lentis 1, isolated, autosomal dominant; Marfan syndrome; MASS syndrome; Stiff skin syndrome; Weill-Marchesani syndrome 2, dominant; Acromicric dysplasia; Geleophysic dysplasia 2; Progeroid and marfanoid aspect-lipodystrophy syndrome 2021-12-06 criteria provided, single submitter clinical testing
Labcorp Genetics (formerly Invitae), Labcorp RCV003771767 SCV004572558 uncertain significance Marfan syndrome; Familial thoracic aortic aneurysm and aortic dissection 2023-12-26 criteria provided, single submitter clinical testing This sequence change replaces methionine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 99 of the FBN1 protein (p.Met99Ile). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with FBN1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1211251). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on FBN1 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.

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