ClinVar Miner

Submissions for variant NM_000249.4(MLH1):c.557A>G (p.His186Arg)

dbSNP: rs1060500712
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Color Diagnostics, LLC DBA Color Health RCV001182892 SCV001348491 uncertain significance Hereditary cancer-predisposing syndrome 2019-09-13 criteria provided, single submitter clinical testing This missense variant replaces histidine with arginine at codon 186 of the MLH1 protein. Computational prediction tool suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold ≥0.7, PMID: 27666373). Score = 0.926. Splice site prediction tools suggest that this variant may not impact RNA splicing. To our knowledge, functional studies have not been performed for this variant. This variant has not been reported in individuals affected with hereditary cancer in the literature. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.
Invitae RCV001876078 SCV002214377 uncertain significance Hereditary nonpolyposis colorectal neoplasms 2023-04-07 criteria provided, single submitter clinical testing This variant is not present in population databases (gnomAD no frequency). This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 186 of the MLH1 protein (p.His186Arg). This variant has not been reported in the literature in individuals affected with MLH1-related conditions. 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. 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. ClinVar contains an entry for this variant (Variation ID: 922704).
Ambry Genetics RCV001182892 SCV002650941 uncertain significance Hereditary cancer-predisposing syndrome 2020-11-25 criteria provided, single submitter clinical testing The p.H186R variant (also known as c.557A>G), located in coding exon 7 of the MLH1 gene, results from an A to G substitution at nucleotide position 557. The histidine at codon 186 is replaced by arginine, an amino acid with highly similar properties. 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.

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