Submissions for variant NM_000179.3(MSH6):c.1050C>T (p.Ala350=)

gnomAD frequency: 0.00006  dbSNP: rs730881802

Total submissions: 18

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
GeneDx	RCV000212643	SCV000211311	benign	not specified	2014-08-21	criteria provided, single submitter	clinical testing	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.
Ambry Genetics	RCV000160690	SCV000215047	benign	Hereditary cancer-predisposing syndrome	2014-11-18	criteria provided, single submitter	clinical testing	This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.
Labcorp Genetics (formerly Invitae), Labcorp	RCV001080910	SCV000283696	likely benign	Hereditary nonpolyposis colorectal neoplasms	2024-01-30	criteria provided, single submitter	clinical testing
Illumina Laboratory Services, Illumina	RCV000409759	SCV000430957	uncertain significance	Lynch syndrome 5	2018-01-13	criteria provided, single submitter	clinical testing	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Counsyl	RCV000409759	SCV000489426	likely benign	Lynch syndrome 5	2016-10-03	criteria provided, single submitter	clinical testing
Color Diagnostics, LLC DBA Color Health	RCV000160690	SCV000537490	likely benign	Hereditary cancer-predisposing syndrome	2015-08-04	criteria provided, single submitter	clinical testing
Genetic Services Laboratory, University of Chicago	RCV000212643	SCV000595840	likely benign	not specified	2017-02-16	criteria provided, single submitter	clinical testing
Quest Diagnostics Nichols Institute San Juan Capistrano	RCV000586411	SCV000601500	uncertain significance	not provided	2022-10-28	criteria provided, single submitter	clinical testing	The frequency of this variant in the general population, 0.00013 (17/128994 chromosomes, http://gnomad.broadinstitute.org), is uninformative in assessment of its pathogenicity. In the published literature, the variant has been reported in an individual with ovarian carcinoma (PMID: 23047549 (2012)). Analysis of this variant using software algorithms for the prediction of the effect of nucleotide changes on splicing yielded predictions that this variant does not affect MSH6 mRNA splicing . Based on the available information, we are unable to determine the clinical significance of this variant.
Women's Health and Genetics/Laboratory Corporation of America, LabCorp	RCV000212643	SCV000695769	likely benign	not specified	2019-08-29	criteria provided, single submitter	clinical testing
PreventionGenetics, part of Exact Sciences	RCV000586411	SCV000805836	likely benign	not provided	2017-10-25	criteria provided, single submitter	clinical testing
Mendelics	RCV000409759	SCV001135801	likely benign	Lynch syndrome 5	2019-05-28	criteria provided, single submitter	clinical testing
CeGaT Center for Human Genetics Tuebingen	RCV000586411	SCV001250446	likely benign	not provided	2024-08-01	criteria provided, single submitter	clinical testing	MSH6: BP4, BP7
Sema4, Sema4	RCV000160690	SCV002535584	likely benign	Hereditary cancer-predisposing syndrome	2021-07-26	criteria provided, single submitter	curation
Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	RCV000212643	SCV002552288	likely benign	not specified	2023-08-15	criteria provided, single submitter	clinical testing
CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	RCV003149978	SCV003838316	likely benign	Breast and/or ovarian cancer	2022-05-04	criteria provided, single submitter	clinical testing
Myriad Genetics, Inc.	RCV000409759	SCV004019006	benign	Lynch syndrome 5	2023-03-29	criteria provided, single submitter	clinical testing	This variant is considered benign. This variant is a silent/synonymous amino acid change and it is not expected to impact splicing.
All of Us Research Program, National Institutes of Health	RCV003998501	SCV004837569	likely benign	Lynch syndrome	2023-12-01	criteria provided, single submitter	clinical testing
Department of Pathology and Laboratory Medicine, Sinai Health System	RCV001356437	SCV001551604	likely benign	Malignant tumor of breast		no assertion criteria provided	clinical testing	The MSH6 p.Ala350= variant was identified in 1 of 3786 proband chromosomes (frequency: 0.0003) from individuals or families with ovarian cancer (Pal 2012). The variant was also identified in dbSNP (ID: rs730881802) as "With other allele", ClinVar (classified as benign by GeneDx and Ambry Genetics; as likely benign by Invitae and four other submitters; as uncertain significance by three submitters). The variant was not identified in UMD-LSDB. The variant was identified in control databases in 18 of 276982 chromosomes at a frequency of 0.00007 (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: Other in 1 of 6468 chromosomes (freq: 0.0002), European in 16 of 126500 chromosomes (freq: 0.0001), Finnish in 1 of 25786 chromosomes (freq: 0.00004); it was not observed in the African, Latino, Ashkenazi Jewish, East Asian, and South Asian populations. The p.Ala350= variant is not expected to have clinical significance because it does not result in a change of amino acid and is not located in a known consensus splice site. In addition, in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as likely benign.