Total submissions: 4
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Ambry Genetics | RCV000574848 | SCV000662582 | uncertain significance | Hereditary cancer-predisposing syndrome | 2022-12-27 | criteria provided, single submitter | clinical testing | The p.Q657H variant (also known as c.1971G>C), located in coding exon 4 of the MSH6 gene, results from a G to C substitution at nucleotide position 1971. The glutamine at codon 657 is replaced by histidine, an amino acid with highly similar properties. This amino acid position is not 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. |
| Invitae | RCV001227127 | SCV001399468 | uncertain significance | Hereditary nonpolyposis colorectal neoplasms | 2023-11-28 | criteria provided, single submitter | clinical testing | This sequence change replaces glutamine, which is neutral and polar, with histidine, which is basic and polar, at codon 657 of the MSH6 protein (p.Gln657His). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with MSH6-related conditions. ClinVar contains an entry for this variant (Variation ID: 479971). 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 MSH6 protein function with a negative predictive value of 95%. 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. |
| CHEO Genetics Diagnostic Laboratory, |
RCV003492101 | SCV004239304 | uncertain significance | Breast and/or ovarian cancer | 2022-12-30 | criteria provided, single submitter | clinical testing | |
| All of Us Research Program, |
RCV004000888 | SCV004818687 | uncertain significance | Lynch syndrome | 2023-03-28 | criteria provided, single submitter | clinical testing |