Total submissions: 2
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Labcorp Genetics |
RCV001036357 | SCV001199717 | uncertain significance | Retinoblastoma | 2023-05-01 | criteria provided, single submitter | clinical testing | 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: 835468). This variant has not been reported in the literature in individuals affected with RB1-related conditions. This variant is present in population databases (rs775880919, gnomAD 0.0009%). This sequence change replaces glutamine, which is neutral and polar, with arginine, which is basic and polar, at codon 639 of the RB1 protein (p.Gln639Arg). |
| Ambry Genetics | RCV002409365 | SCV002723316 | uncertain significance | Hereditary cancer-predisposing syndrome | 2022-09-28 | criteria provided, single submitter | clinical testing | The p.Q639R variant (also known as c.1916A>G), located in coding exon 19 of the RB1 gene, results from an A to G substitution at nucleotide position 1916. The glutamine at codon 639 is replaced by arginine, an amino acid with highly similar properties. This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. |