Total submissions: 3
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Ambry Genetics | RCV001018115 | SCV001179302 | uncertain significance | Hereditary cancer-predisposing syndrome | 2024-07-17 | criteria provided, single submitter | clinical testing | The p.C288S variant (also known as c.863G>C), located in coding exon 3 of the BLM gene, results from a G to C substitution at nucleotide position 863. The cysteine at codon 288 is replaced by serine, an amino acid with dissimilar properties. This amino acid position is poorly conserved in available vertebrate species. 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 |
RCV001860893 | SCV002288296 | uncertain significance | Bloom syndrome | 2022-05-10 | 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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 822623). This variant has not been reported in the literature in individuals affected with BLM-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces cysteine, which is neutral and slightly polar, with serine, which is neutral and polar, at codon 288 of the BLM protein (p.Cys288Ser). |
| Quest Diagnostics Nichols Institute San Juan Capistrano | RCV004998552 | SCV005624292 | uncertain significance | not provided | 2024-07-11 | criteria provided, single submitter | clinical testing | The BLM c.863G>C (p.Cys288Ser) variant has not been reported in individuals with BLM-related conditions in the published literature. It also has not been reported in large, multi-ethnic general populations (Genome Aggregation Database, http://gnomad.broadinstitute.org). Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is benign. Based on the available information, we are unable to determine the clinical significance of this variant. |