ClinVar Miner

Submissions for variant NM_000057.4(BLM):c.954C>G (p.Cys318Trp)

dbSNP: rs1596221322
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Ambry Genetics RCV001019476 SCV001180839 uncertain significance Hereditary cancer-predisposing syndrome 2022-02-21 criteria provided, single submitter clinical testing The p.C318W variant (also known as c.954C>G), located in coding exon 3 of the BLM gene, results from a C to G substitution at nucleotide position 954. The cysteine at codon 318 is replaced by tryptophan, an amino acid with highly dissimilar properties. This amino acid position is well 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 (formerly Invitae), Labcorp RCV001273657 SCV001540106 uncertain significance Bloom syndrome 2024-01-04 criteria provided, single submitter clinical testing This sequence change replaces cysteine, which is neutral and slightly polar, with tryptophan, which is neutral and slightly polar, at codon 318 of the BLM protein (p.Cys318Trp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with BLM-related conditions. ClinVar contains an entry for this variant (Variation ID: 823325). 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 BLM protein function with a negative predictive value of 80%. 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.
Natera, Inc. RCV001273657 SCV001456985 uncertain significance Bloom syndrome 2020-04-23 no assertion criteria provided clinical testing

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