2-47482793-T-G

Position:

chr2-47482793-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_000251.3(MSH2):c.2649T>G(p.Ile883Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000248 in 1,613,494 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. I883T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

MSH2
NM_000251.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:1

Conservation

PhyloP100: 0.578

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 Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.21389079).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSH2	NM_000251.3 linkuse as main transcript	c.2649T>G	p.Ile883Met	missense_variant	16/16	ENST00000233146.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSH2	ENST00000233146.7 linkuse as main transcript	c.2649T>G	p.Ile883Met	missense_variant	16/16	1	NM_000251.3	P1	P43246-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152252

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000797

AC:

AN:

250902

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135694

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461242

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726908

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000757

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152252

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74390

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000192

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Feb 19, 2024	The p.I883M variant (also known as c.2649T>G), located in coding exon 16 of the MSH2 gene, results from a T to G substitution at nucleotide position 2649. The isoleucine at codon 883 is replaced by methionine, an amino acid with highly similar properties. This alteration has been identified in an individual with an MSI-high colorectal cancer diagnosed at age 38 year and a metachronous endometrial cancer diagnosed at age 41 years showing loss of MSH2 on immunohistochemistry (Bae S et al. Korean J Obstet Gynecol 2012;55(11):870-873). This variant has also been identified in a large unselected colorectal cancer cohort (Sinn D et al. Hepatogastroenterology 2009;56(91-92):672-6), and in a cohort of 1135 Chinese patients with gastric cancer (Zhang C et al. J Med Genet, 2023 Aug;60:760-768). In a massively parallel cell-based functional assay testing susceptibility to a DNA damaging agent, 6-thioguanine (6-TG), this variant was reported to be functionally neutral (Jia X et al. Am J Hum Genet, 2021 01;108:163-175). This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this alteration remains unclear. -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Dec 21, 2022	This missense variant replaces isoleucine with methionine at codon 883 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). This variant has intermediate MSH2 function in a 6-thioguanine sensitivity assay in haploid human cells (internally defined LOF score threshold -1.32 < LOF score < 0.88, PMID: 33357406). This variant has been reported in individuals affected with Lynch syndrome (PMID: 25110875, 29442399), however, in one of these individuals this variant co-occurred with another potentially pathogenic MSH2 variant (PMID: 29442399). This variant has been identified in 3/282316 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 specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Jan 18, 2019

Variant summary: MSH2 c.2649T>G (p.Ile883Met) results in a conservative amino acid change in 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 1.1e-05 in 276876 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.2649T>G has been reported in the literature in an individual affected with Lynch Syndrome (Kang 2015, Lee 2018). These reports do not provide unequivocal conclusions about association of the variant with Lynch Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation, and both laboratories classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Lynch syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Dec 13, 2023

This missense variant replaces isoleucine with methionine at codon 883 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). This variant has intermediate MSH2 function in a 6-thioguanine sensitivity assay in haploid human cells (internally defined LOF score threshold -1.32 < LOF score < 0.88, PMID: 33357406). This variant has been reported in individuals affected with Lynch syndrome (PMID: 25110875, 29442399), however, in one of these individuals this variant co-occurred with another potentially pathogenic MSH2 variant (PMID: 29442399). This variant has been identified in 3/282316 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:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 26, 2022

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Observed in individuals with MSH2-related cancers, including one individual with tumor studies consistent with pathogenic variants in this gene (Zhu 2013, Kang 2015, Lee 2018); This variant is associated with the following publications: (PMID: 19621678, 23760103, 27873144, 18822302, 9774676, 25110875, 29442399) -

Hereditary nonpolyposis colorectal neoplasms

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Nov 28, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

0.0066

BayesDel_noAF

Uncertain

0.0

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.43

T;.

Eigen

Benign

-0.20

Eigen_PC

Benign

-0.27

FATHMM_MKL

Benign

0.68

LIST_S2

Uncertain

0.91

D;D

M_CAP

Benign

0.079

MetaRNN

Benign

0.21

T;T

MetaSVM

Uncertain

-0.011

MutationAssessor

Uncertain

2.0

M;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.58

PROVEAN

Benign

-1.3

N;N

REVEL

Uncertain

0.60

Sift

Benign

0.13

T;T

Sift4G

Benign

0.14

T;T

Polyphen

0.97

D;.

Vest4

0.69

MutPred

0.48

Loss of methylation at K882 (P = 0.0238);.;

MVP

0.86

MPC

0.021

ClinPred

0.32

GERP RS

-3.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.19

gMVP

0.30

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