rs548407418
Variant summary
Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM1BP6
The NM_000251.3(MSH2):āc.1790A>Cā(p.Asp597Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000205 in 1,613,682 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D597G) has been classified as Likely benign.
Frequency
Consequence
NM_000251.3 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Uncertain_significance. Variant got 1 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
MSH2 | NM_000251.3 | c.1790A>C | p.Asp597Ala | missense_variant | 12/16 | ENST00000233146.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
MSH2 | ENST00000233146.7 | c.1790A>C | p.Asp597Ala | missense_variant | 12/16 | 1 | NM_000251.3 | P1 |
Frequencies
GnomAD3 genomes AF: 0.000112 AC: 17AN: 152142Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000159 AC: 4AN: 251456Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 135896
GnomAD4 exome AF: 0.0000109 AC: 16AN: 1461422Hom.: 0 Cov.: 32 AF XY: 0.00000688 AC XY: 5AN XY: 727030
GnomAD4 genome AF: 0.000112 AC: 17AN: 152260Hom.: 0 Cov.: 32 AF XY: 0.000121 AC XY: 9AN XY: 74442
ClinVar
Submissions by phenotype
Lynch syndrome Uncertain:3
Uncertain significance, criteria provided, single submitter | clinical testing | Mendelics | Jul 02, 2018 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | St. Jude Molecular Pathology, St. Jude Children's Research Hospital | Sep 23, 2020 | The MSH2 c.1790A>C (p.Asp597Ala) missense change has a maximum subpopulation frequency of 0.0087% gnomAD v2.1.1 (PM2_Supporting; https://gnomad.broadinstitute.org/variant/2-47702194-A-C). In silico tools are not in agreement about a tolerated or damaging effect on the gene or protein product and functional studies have not been performed. To our knowledge, this variant has not been reported in individuals with Lynch syndrome or CMMRD. In summary, this variant meets criteria to be classified as of uncertain significance based on the ACMG/AMP criteria: PM2_Supporting. - |
Uncertain significance, criteria provided, single submitter | clinical testing | All of Us Research Program, National Institutes of Health | Dec 18, 2023 | This missense variant replaces aspartic acid with alanine at codon 597 of the MSH2 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). A functional study reported that this variant may not impact DNA mismatch repair activity based on a 6-thioguanine sensitivity assay in Msh2-deficient haploid human cells (PMID: 33357406). This variant has been reported in one individual affected with pediatric leukemia (PMID: 26580448), an individual affected with an unspecified Lynch syndrome-associated cancer (PMID: 31391288), and in a healthy control (PMID: 33471991). This variant has been identified in 4/251456 chromosomes 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. - |
not provided Uncertain:3
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Mar 08, 2023 | Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Observed in a pediatric patient with leukemia and in an individual whose tumor was assessed with MSI and/or IHC (Zhang et al., 2015; Li et al., 2020); Published functional studies suggest a neutral effect: demonstrates resistance to 6-TG similar to wild type (Jia et al., 2020); This variant is associated with the following publications: (PMID: 31569399, 33471991, 18822302, 9774676, 21120944, 26580448, 33357406, 31391288) - |
Uncertain significance, criteria provided, single submitter | clinical testing | Quest Diagnostics Nichols Institute San Juan Capistrano | Jan 31, 2023 | The frequency of this variant in the general population, 0.000087 (3/34586 chromosomes, http://gnomad.broadinstitute.org), is uninformative in assessment of its pathogenicity. In the published literature, the variant has been reported in individuals affected with Lynch syndrome-associated cancer and acute lymphoblastic leukemia (PMIDs: 31391288 (2020) and 26580448 (2015)). In a large case-control study, this variant has only been detected in an unaffected control but not in individuals with breast cancer (PMID: 33471991 (2021), see also LOVD (http://databases.lovd.nl/shared/genes/MSH2)). A screening assay based on cell survival in response to 6-thioguanine treatment indicated the variant has neutral effects on DNA mismatch repair function in vivo (PMID: 33357406 (2021)). Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded conflicting predictions that this variant is deleterious or benign. Based on the available information, we are unable to determine the clinical significance of this variant. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Jun 26, 2019 | - - |
Hereditary cancer-predisposing syndrome Uncertain:2Benign:1
Uncertain significance, criteria provided, single submitter | curation | Sema4, Sema4 | Sep 11, 2021 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Jan 04, 2023 | This missense variant replaces aspartic acid with alanine at codon 597 of the MSH2 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). A functional study reported that this variant may not impact DNA mismatch repair activity based on a 6-thioguanine sensitivity assay in Msh2-deficient haploid human cells (PMID: 33357406). This variant has been reported in one individual affected with pediatric leukemia (PMID: 26580448), an individual affected with an unspecified Lynch syndrome-associated cancer (PMID: 31391288), and in a healthy control (PMID: 33471991). This variant has been identified in 4/251456 chromosomes 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. - |
Likely benign, criteria provided, single submitter | clinical testing | Ambry Genetics | Jul 12, 2021 | This alteration is classified as likely 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. - |
Lynch syndrome 1 Uncertain:1Benign:1
Uncertain significance, criteria provided, single submitter | clinical testing | Counsyl | Oct 03, 2016 | - - |
Likely benign, criteria provided, single submitter | clinical testing | Myriad Genetics, Inc. | Dec 12, 2023 | This variant is considered likely benign. This variant is strongly associated with less severe personal and family histories of cancer, typical for individuals without pathogenic variants in this gene [PMID: 27363726]. - |
MSH2-related disorder Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | Feb 05, 2024 | The MSH2 c.1790A>C variant is predicted to result in the amino acid substitution p.Asp597Ala. This variant has been reported in an individual with hypodiploid acute lymphoblastic leukemia (Table S4A, Zhang et al. 2015. PubMed ID: 26580448). In addition, this variant is observed once and interpreted as variant of uncertain significance in a cohort study of 4740 patients with Lynch syndrome associated cancer (Table S5, Li et al 2020. PubMed ID: 31391288). This variant is reported in 0.0087% of alleles in individuals of Latino descent in gnomAD and is interpreted as uncertain by the vast majority of submitters in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/183758/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. - |
not specified Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | May 08, 2023 | Variant summary: MSH2 c.1790A>C (p.Asp597Ala) results in a non-conservative amino acid change located in the core domain (IPR007696) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00011 in 150914 control chromosomes, predominantly at a frequency of 0.001 within the Latino subpopulation in the gnomAD database. The observed variant frequency within Latino control individuals in the gnomAD database is approximately 1.8-fold of the estimated maximal expected allele frequency for a pathogenic variant in MSH2 causing Hereditary Nonpolyposis Colorectal Cancer phenotype (0.00057), suggesting that the variant is a benign polymorphism found primarily in populations of Latino origin. c.1790A>C has been reported in the literature in individuals affected with pediatric leukemia and Lynch syndrome-associated cancer (Zhang_2015, Li_2020), but was also found among healthy controls (Dorling_2021). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Nonpolyposis Colorectal Cancer. At least one publication reports experimental evidence evaluating an impact on protein function, and demonstrated that the variant restores 6-thioguanine sensitivity, thus likely does not impact DNA mismatch repair activity (Jia_2021). The following publications have been ascertained in the context of this evaluation (PMID: 26580448, 31569399, 31391288, 33357406, 33471991). Ten other submitters have provided clinical-significance assessments for this variant in ClinVar after 2014, mostly without evidence for independent evaluation, and classified the variant as VUS (n=8), likely benign (n=1) or benign (n=1). Based on the evidence outlined above, the variant was classified as likely benign. - |
Hereditary nonpolyposis colorectal neoplasms Benign:1
Benign, criteria provided, single submitter | clinical testing | Invitae | Jan 10, 2024 | - - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at