ClinVar

Description

This variant affects a cysteine residue in the EGF-like, TGFBP or hybrid motif domains of FBN1. Cysteine residues are believed to be involved in intramolecular disulfide bridges and have been shown to be important for FBN1 protein structure (PMID: 16905551, 19349279). In addition, missense substitutions affecting cysteine residues within these domains are significantly overrepresented among patients with Marfan syndrome (PMID: 16571647, 17701892). This variant has been observed in individual(s) with Marfan syndrome (PMID: 16220557, Invitae). ClinVar contains an entry for this variant (Variation ID: 439719). 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. This variant disrupts the p.Cys1928 amino acid residue in FBN1. Other variant(s) that disrupt this residue have been observed in individuals with FBN1-related conditions (PMID: 7611299, 25101912, 19059503), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. This variant is not present in population databases (ExAC no frequency). This sequence change replaces cysteine with tyrosine at codon 1928 of the FBN1 protein (p.Cys1928Tyr). The cysteine residue is highly conserved and there is a large physicochemical difference between cysteine and tyrosine.