NM_000251.3:c.499G>C

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 6P and 12B. PM1PP3_StrongBP6_Very_StrongBS2

The NM_000251.3(MSH2):c.499G>C(p.Asp167His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000979 in 1,614,050 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00010 ( 2 hom. )

Consequence

MSH2
NM_000251.3 missense

Scores

Clinical Significance

Benign reviewed by expert panel U:2B:16

Conservation

PhyloP100: 9.92

Variant links:

Genes affected

MSH2 (HGNC:7325): (mutS homolog 2) This locus is frequently mutated in hereditary nonpolyposis colon cancer (HNPCC). When cloned, it was discovered to be a human homolog of the E. coli mismatch repair gene mutS, consistent with the characteristic alterations in microsatellite sequences (RER+ phenotype) found in HNPCC. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2012]

MSH2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

PM1

In a strand (size 7) in uniprot entity MSH2_HUMAN there are 9 pathogenic changes around while only 2 benign (82%) in NM_000251.3

PP3

MetaRNN computational evidence supports a deleterious effect, 0.946

BP6

Variant 2-47410226-G-C is Benign according to our data. Variant chr2-47410226-G-C is described in ClinVar as [Benign]. Clinvar id is 91112.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr2-47410226-G-C is described in Lovd as [Benign].

BS2

High Homozygotes in GnomAdExome4 at 2 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MSH2	NM_000251.3 link	c.499G>C	p.Asp167His	missense_variant	Exon 3 of 16	ENST00000233146.7	NP_000242.1	P43246-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MSH2	ENST00000233146.7 link	c.499G>C	p.Asp167His	missense_variant	Exon 3 of 16	1	NM_000251.3	ENSP00000233146.2		P43246-1

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000875

AC:

AN:

251484

Hom.:

AF XY:

0.0000956

AC XY:

AN XY:

135916

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000196

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000123

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000101

AC:

148

AN:

1461884

Hom.:

Cov.:

AF XY:

0.000102

AC XY:

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000139

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000836

Gnomad4 OTH exome

AF:

0.000281

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152166

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74324

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.0000656

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000112

Hom.:

Bravo

AF:

0.0000945

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000107

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Benign

Submissions summary: Uncertain:2Benign:16

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:1Benign:3

Aug 01, 2018

GeneKor MSA

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 16, 2018

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Jan 02, 2022

Color Diagnostics, LLC DBA Color Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 26, 2021

Sema4, Sema4

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Lynch syndrome 1

Benign:4

Aug 22, 2023

Mendelics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 13, 2018

International Society for Gastrointestinal Hereditary Tumours (InSiGHT)

Significance: Benign

Review Status: reviewed by expert panel

Collection Method: curation

Multifactorial likelihood analysis posterior probability < 0.001 (0.000015) -

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Dec 04, 2024

Myriad Genetics, Inc.

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered 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]. Homozygosity for this variant has been confirmed in one or more individuals lacking clinical features consistent with gene-specific recessive disease, indicating that this variant is unlikely to be pathogenic. -

not provided

Uncertain:1Benign:2

Jan 22, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is associated with the following publications: (PMID: 17720936, 12124176, 8872463, 26951660, 28125613, 25637381, 18781619, 20672385, 17192056, 15340264, 11870161, 18822302, 22102614, 22949387, 20176959, 11606497, 25980754, 18383312, 17250665, 17594722, 23741719, 19464205, 26333163, 22045683, 27601186, 31159747, 31237724, 31569399) -

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Sep 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

MSH2: BP1, BS3:Supporting, BS1, BS2 -

not specified

Benign:3

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 26, 2021

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: MSH2 c.499G>C (p.Asp167His) results in a non-conservative amino acid change located in the DNA mismatch repair protein MutS, connector domain of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 8.7e-05 in 251484 control chromosomes in the gnomAD database, including 1 homozygote. This frequency is not higher than expected for a pathogenic variant in MSH2 causing Hereditary Nonpolyposis Colorectal Cancer (8.7e-05 vs 0.00057), allowing no conclusion about variant significance. c.499G>C has been reported in the literature in individuals affected with Hereditary Nonpolyposis Colorectal Cancer and breast cancer (e.g. Moslein_1996, Scartozzi_2002, Belvederesi_2008, Yurgelun_2015, Lagerstedt-Robinson_2016, Rizzolo_2019, Tsaousis_2019, Ryan_2020, Doling_2021) but it was also reported in controls (e.g. Dorling_2021). In two of the patients from these studies where tumor analysis was carried out, IHC was found to be normal for MSH2 while loss of MLH1 protein expression was noted (Scartozzi_2002, Belvederesi_2008). In a third patient who did not fullfil Amsterdam-II Criteria or Revised Bethesda Criteria, normal IHC results and MSS was observed (Ryan_2020). These results provide supporting evidence for a benign role of the variant. Co-occurrences with pathogenic variants have been reported [MLH1 c.1852_1854delAAG, p.Lys618del (UMD); MLH1 21delG, p.Ile8PhefsX9 (Moslein_1996)], providing further supporting evidence for a benign role. Experimental evidence from multiple studies, including a recent in cellulo functional assay utilizing CRISPR-Cas9 gene editing in human embryonic stem cells, agree in their majority that the variant acts comparable to wild type (e.g. Gammie_2007, Belvederesi_2008, Drost_2011, Rath_2019). Six ClinVar submitters including an expert panel (InSiGHT) (evaluation after 2014) cite the variant as benign/likely benign and three ClinVar submitters (evaluation after 2014) cite it as uncertain significance. Based on the evidence outlined above, the variant was classified as benign. -

May 10, 2024

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

MSH2-related disorder

Benign:1

Jun 03, 2019

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Breast and/or ovarian cancer

Benign:1

Apr 27, 2023

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Colorectal cancer, non-polyposis

Benign:1

Jun 01, 2014

CSER _CC_NCGL, University of Washington

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: research

- -

Hereditary nonpolyposis colorectal neoplasms

Benign:1

Jan 14, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.91

BayesDel_addAF

Pathogenic

0.36

BayesDel_noAF

Pathogenic

0.53

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.95

D;D;.;.;.

Eigen

Pathogenic

1.0

Eigen_PC

Pathogenic

0.97

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.96

D;D;D;D;D

M_CAP

Uncertain

0.24

MetaRNN

Pathogenic

0.95

D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.3

M;.;.;.;.

PrimateAI

Uncertain

0.72

PROVEAN

Pathogenic

-6.6

D;D;D;.;D

REVEL

Pathogenic

0.96

Sift

Pathogenic

0.0

D;D;D;.;D

Sift4G

Uncertain

0.0020

D;D;D;.;D

Polyphen

1.0

D;.;.;.;D

Vest4

0.99

MVP

0.99

MPC

0.033

ClinPred

0.76

GERP RS

5.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.92

gMVP

0.86

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over