ClinVar Miner

Submissions for variant NM_000179.2(MSH6):c.2906A>G (p.Tyr969Cys) (rs63749919)

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Total submissions: 4
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Ambry Genetics RCV000491101 SCV000580279 likely pathogenic Hereditary cancer-predisposing syndrome 2017-01-06 criteria provided, single submitter clinical testing Lines of evidence used in support of classification: Insufficient or conflicting evidence,In silico models in agreement (deleterious) and/or completely conserved position in appropriate species,Detected in individual satisfying established diagnostic critera for classic disease without a clear mutation
GeneDx RCV000218181 SCV000279613 likely pathogenic not provided 2017-04-20 criteria provided, single submitter clinical testing This variant is denoted MSH6 c.2906A>G at the cDNA level, p.Tyr969Cys (Y969C) at the protein level, and results in the change of a Tyrosine to a Cysteine (TAT>TGT) in exon 4. This variant has been reported in at least three colorectal cancer families where loss of MSH6 has been observed via mismatch repair immunohistochemistry (MMR IHC) in several individuals' colon tumors (Suchy 2006, Grindedal 2009, Sjursen 2010). In addition, this variant is noted to segregate with cancer in at least two families (Grindedal 2009, Sjursen 2010). MSH6 Tyr969Cys was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, suggesting it is not a common benign variant in these populations. Since Tyrosine and Cysteine differ in polarity, charge, size or other properties, this is considered a non-conservative amino acid substitution. MSH6 Tyr969Cys occurs at a position that is conserved in mammals and is located in the MutS IV domain (Terui 2013). In silico analyses predict that this variant is probably damaging to protein structure and function. Based on currently available evidence and internal data, we consider MSH6 Tyr969Cys to be a likely pathogenic variant.
International Society for Gastrointestinal Hereditary Tumours (InSiGHT) RCV000623975 SCV000740676 likely pathogenic Lynch syndrome I 2018-03-09 reviewed by expert panel curation Class 4 - Likely Pathogenic Classification using multifactorial probability: 0.9528
Invitae RCV000458194 SCV000551056 uncertain significance Lynch syndrome 2016-04-16 criteria provided, single submitter clinical testing This sequence change replaces tyrosine with cysteine at codon 969 of the MSH6 protein (p.Tyr969Cys). The tyrosine residue is highly conserved and there is a large physicochemical difference between tyrosine and cysteine. This variant is present in population databases (rs63749919, ExAC <0.01%). This variant has been reported in individuals affected with colorectal cancer (PMID: 19723918, 16813607). In one family this variant was reported to segregate with disease, however the segregation data provided was not conclusive (PMID: 20587412). General algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD), and an algorithm developed specifically for the MSH6 gene (PMID: 23621914), suggest that this missense change is likely to be deletrious. However, these predictions have not been confirmed by published functional studies. In summary, this is a rare missense variant observed both in the population and in patients. While algorithms suggest this variant disrupts protein function, the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance.

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