ClinVar Miner

Submissions for variant NM_000138.5(FBN1):c.8333T>G (p.Leu2778Arg)

dbSNP: rs1555393553
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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 RCV000631973 SCV000753076 likely pathogenic Marfan syndrome; Familial thoracic aortic aneurysm and aortic dissection 2023-08-17 criteria provided, single submitter clinical testing This missense change has been observed in individuals with clinical features of FBN1-related conditions (Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 2778 of the FBN1 protein (p.Leu2778Arg). ClinVar contains an entry for this variant (Variation ID: 527186). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. This variant disrupts the p.Leu2778 amino acid residue in FBN1. Other variant(s) that disrupt this residue have been observed in individuals with FBN1-related conditions (PMID: 25652356; Invitae), which suggests that this may be a clinically significant amino acid residue. 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 FBN1 protein function.

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