Total submissions: 2
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Ambry Genetics | RCV002393819 | SCV002671938 | uncertain significance | Hereditary cancer-predisposing syndrome | 2024-03-31 | criteria provided, single submitter | clinical testing | The p.R251G variant (also known as c.751C>G), located in coding exon 8 of the RB1 gene, results from a C to G substitution at nucleotide position 751. The arginine at codon 251 is replaced by glycine, an amino acid with dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. |
| Labcorp Genetics |
RCV003514565 | SCV004278816 | uncertain significance | Retinoblastoma | 2023-08-25 | criteria provided, single submitter | clinical testing | This sequence change replaces arginine, which is basic and polar, with glycine, which is neutral and non-polar, at codon 251 of the RB1 protein (p.Arg251Gly). 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. 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. ClinVar contains an entry for this variant (Variation ID: 1759319). This variant has not been reported in the literature in individuals affected with RB1-related conditions. This variant is not present in population databases (gnomAD no frequency). |