Total submissions: 2
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Ambry Genetics | RCV002401025 | SCV002707348 | uncertain significance | Hereditary cancer-predisposing syndrome | 2022-04-19 | criteria provided, single submitter | clinical testing | The p.G540D variant (also known as c.1619G>A), located in coding exon 17 of the RB1 gene, results from a G to A substitution at nucleotide position 1619. The glycine at codon 540 is replaced by aspartic acid, an amino acid with similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. |
| Labcorp Genetics |
RCV003774414 | SCV004641352 | uncertain significance | Retinoblastoma | 2023-10-04 | 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 540 of the RB1 protein (p.Gly540Asp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with RB1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1776555). 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 not expected to disrupt RB1 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. |