Total submissions: 2
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Ambry Genetics | RCV001013031 | SCV001173563 | uncertain significance | Hereditary cancer-predisposing syndrome | 2021-12-17 | criteria provided, single submitter | clinical testing | The p.A589T variant (also known as c.1765G>A), located in coding exon 16 of the MLH1 gene, results from a G to A substitution at nucleotide position 1765. The alanine at codon 589 is replaced by threonine, an amino acid with similar properties. This amino acid position is highly 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. |
| Invitae | RCV001371599 | SCV001568170 | uncertain significance | Hereditary nonpolyposis colorectal neoplasms | 2023-10-23 | criteria provided, single submitter | clinical testing | This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 589 of the MLH1 protein (p.Ala589Thr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with biliary tract cancer (PMID: 36243179). ClinVar contains an entry for this variant (Variation ID: 820015). 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 MLH1 protein function with a positive 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. |