rs63750820

chr2-47466707-A-Gchr2-47466707-A-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Strong BP6 BP7

The NM_000251.3(MSH2):c.1560A>G(p.Gly520=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000812 in 1,614,078 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).

• Frequency:
  • Genomes: 𝑓 0.000072 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000082 (0 hom.)
• Consequence: MSH2 NM_000251.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:15
• Conservation: PhyloP100: -0.306

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 Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.48).
• BP6: Variant 2-47466707-A-G is Benign according to our data. Variant chr2-47466707-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 138254.We mark this variant Likely_benign, oryginal submissions are: {Benign=5, Likely_benign=9, Uncertain_significance=1}.
• BP7: Synonymous conserved (PhyloP=-0.306 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSH2	NM_000251.3	c.1560A>G	p.Gly520=	synonymous_variant	10/16	ENST00000233146.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSH2	ENST00000233146.7	c.1560A>G	p.Gly520=	synonymous_variant	10/16	1	NM_000251.3	P1

Frequencies

GnomAD3 genomes AF: 0.0000723 AC: 11 AN: 152200 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000131 AC: 33 AN: 251390 Hom.: 0 AF XY: 0.0000883 AC XY: 12 AN XY: 135876

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00278

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.0000821 AC: 120 AN: 1461760 Hom.: 0 Cov.: 33 AF XY: 0.0000839 AC XY: 61 AN XY: 727186

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00337

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000126

Gnomad4 OTH exome AF: 0.000282

GnomAD4 genome AF: 0.0000722 AC: 11 AN: 152318 Hom.: 0 Cov.: 33 AF XY: 0.0000671 AC XY: 5 AN XY: 74500

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000383 Hom.: 0

Bravo AF: 0.0000680

EpiCase AF: 0.000109

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:15

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Benign:4

Benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 24, 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. -
Benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Nov 12, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Aug 29, 2019	- -

Lynch syndrome 1 Uncertain:1 Benign:2

Benign, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Mar 20, 2023	This variant is considered benign. This variant is a silent/synonymous amino acid change and it is not expected to impact splicing. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 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. -
Likely benign, criteria provided, single submitter	clinical testing	Counsyl	Mar 21, 2017	- -

Hereditary cancer-predisposing syndrome Benign:3

Likely benign, criteria provided, single submitter	curation	Sema4, Sema4	Jun 25, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jul 15, 2015	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Jun 23, 2022	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. -

Breast and/or ovarian cancer Benign:1

Likely benign, criteria provided, single submitter

clinical testing

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

Nov 14, 2022

- -

MSH2-related disorder Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Aug 24, 2020

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). -

Lynch syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Jan 03, 2024

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Feb 01, 2024

MSH2: BP4, BP7 -

Hereditary nonpolyposis colorectal neoplasms Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 31, 2024

- -

Malignant tumor of breast Benign:1

Likely benign, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The MSH2 p.Gly520= 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: rs63750820) as “With other allele”, ClinVar (classified as benign by GeneDx and Invitae, as likely benign by Ambry Genetics and Color Genomics, and as uncertain significance by Illumina Clinical Services), Mismatch Repair Genes Variant Database, and Insight Hereditary Tumors Database (1x). The variant was not identified in COGR, COSMIC, MutDB, UMD-LSDB, or Zhejiang Colon Cancer databases. The variant was identified in control databases in 34 of 277178 chromosomes at a frequency of 0.0001 (Genome Aggregation Database Feb 27, 2017). The variant was identified in the following populations: Ashkenazi Jewish in 29 of 10150 chromosomes (freq: 0.003), Other in 3 of 6464 chromosomes (freq: 0.0005), and European in 2 of 126680 chromosomes (freq: 0.00002), while the variant was not observed in the African, Latino, East Asian, Finnish, or South Asian populations. In an in vitro study of mismatch repair efficiency, this variant demonstrated in tact MMR activity (Tronov 2006). The p.Gly520= 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, 2 of 5 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, Human Splicing Finder) predict that the variants creates a new 5’ splice site. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.48
Cadd	Benign	7.2
Dann	Benign	0.70

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs63750820; hg19: chr2-47693846;