ClinVar Miner

Submissions for variant NM_000057.4(BLM):c.2489C>A (p.Thr830Lys)

dbSNP: rs759545027
Minimum review status: Collection method:
Minimum conflict level:
ClinVar version:
Total submissions: 2
Download table as spreadsheet
Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Labcorp Genetics (formerly Invitae), Labcorp RCV001316660 SCV001507291 uncertain significance Bloom syndrome 2023-11-07 criteria provided, single submitter clinical testing This sequence change replaces threonine, which is neutral and polar, with lysine, which is basic and polar, at codon 830 of the BLM protein (p.Thr830Lys). 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: 1017501). 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 expected to disrupt BLM protein function with a positive 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.
Ambry Genetics RCV002431901 SCV002742819 uncertain significance Hereditary cancer-predisposing syndrome 2022-09-06 criteria provided, single submitter clinical testing The p.T830K variant (also known as c.2489C>A), located in coding exon 11 of the BLM gene, results from a C to A substitution at nucleotide position 2489. The threonine at codon 830 is replaced by lysine, an amino acid with similar properties. This alteration was identified in male diagnosed with breast cancer (Rizzolo P et al. Int J Cancer, 2019 07;145:390-400). This amino acid position is highly conserved in available vertebrate species. 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.

The information on this website is not intended for direct diagnostic use or medical decision-making without review by a genetics professional. Individuals should not change their health behavior solely on the basis of information contained on this website. Neither the University of Utah nor the National Institutes of Health independently verfies the submitted information. If you have questions about the information contained on this website, please see a health care professional.