ClinVar

Description

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.Cys30 amino acid residue in TTR. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 1362222, 24664531, Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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 TTR protein function. This variant has not been reported in the literature in individuals with TTR-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces cysteine with tyrosine at codon 30 of the TTR protein (p.Cys30Tyr). The cysteine residue is moderately conserved and there is a large physicochemical difference between cysteine and tyrosine.