rs146577635

chr2-47414295-A-Gchr2-47414295-A-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_Moderate BP6 BP7 BS2

The NM_000251.3(MSH2):c.819A>G(p.Val273=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000156 in 1,613,260 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00092 (2 hom., cov: 29)
  • Exomes 𝑓: 0.000077 (0 hom.)
• Consequence: MSH2 NM_000251.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:11
• Conservation: PhyloP100: -0.257

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]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.42).
• BP6: Variant 2-47414295-A-G is Benign according to our data. Variant chr2-47414295-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 135864.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=5, Uncertain_significance=1, Benign=6}.
• BP7: Synonymous conserved (PhyloP=-0.257 with no splicing effect.
• BS2: High Homozygotes in GnomAd at 2 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSH2	NM_000251.3	c.819A>G	p.Val273=	synonymous_variant	5/16	ENST00000233146.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSH2	ENST00000233146.7	c.819A>G	p.Val273=	synonymous_variant	5/16	1	NM_000251.3	P1

Frequencies

GnomAD3 genomes AF: 0.000901 AC: 137 AN: 151988 Hom.: 2 Cov.: 29

Gnomad AFR AF: 0.00314

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000394

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: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000272 AC: 68 AN: 249764 Hom.: 0 AF XY: 0.000200 AC XY: 27 AN XY: 134914

Gnomad AFR exome AF: 0.00351

Gnomad AMR exome AF: 0.000321

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

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: 0.0000767 AC: 112 AN: 1461154 Hom.: 0 Cov.: 32 AF XY: 0.0000523 AC XY: 38 AN XY: 726808

Gnomad4 AFR exome AF: 0.00254

Gnomad4 AMR exome AF: 0.000336

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000233

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.000166

GnomAD4 genome AF: 0.000920 AC: 140 AN: 152106 Hom.: 2 Cov.: 29 AF XY: 0.000901 AC XY: 67 AN XY: 74368

Gnomad4 AFR AF: 0.00320

Gnomad4 AMR AF: 0.000393

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Alfa AF: 0.00102 Hom.: 0

Bravo AF: 0.00111

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:11

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Jul 21, 2022	- -
Likely benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Oct 25, 2017	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Sep 09, 2014	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. -

not provided Benign:3

Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Jul 10, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 23, 2016	Variant summary: The MSH2 c.819A>G variant affects a non-conserved nucleotide, resulting in no amino acid change. Mutation Taster predicts a damaging outcome for this variant, and 2/5 Alamut algorithms predict no significant change to normal splicing and no changes to ESE binding sites. The variant of interest has not been evaluated for functional impact by in vivo/vitro studies. This variant is found in 31/121148 control chromosomes at a frequency of 0.0002559, which does not significantly exceed maximal expected frequency of a pathogenic allele (0.0005683). However, the allele frequency in Africans (29/10308; 0.002813) is 5-fold greater than the maximal expected allele frequency for a pathogenic MSH2 variant, suggesting that this is a benign polymorphism found in Africans. In addition, clinical laboratories classified this variant as likely benign/benign. Taken together, this variant was classified as benign. -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Apr 13, 2023	- -

Hereditary cancer-predisposing syndrome Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Oct 16, 2015	- -
Benign, criteria provided, single submitter	curation	Sema4, Sema4	Feb 03, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Jun 30, 2014	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:1 Benign:1

Benign, criteria provided, single submitter	clinical testing	KCCC/NGS Laboratory, Kuwait Cancer Control Center	Jul 07, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	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. -

Hereditary nonpolyposis colorectal neoplasms Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 28, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.42
Cadd	Benign	2.8
Dann	Benign	0.73

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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

Other links and lift over

dbSNP: rs146577635; hg19: chr2-47641434;