rs587779150

Positions:

• chr2-47480804-A-G
• chr2-47480804-A-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP6

The NM_000251.3(MSH2):​c.2567A>G​(p.Tyr856Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,818 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict 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. Y856F) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: MSH2 NM_000251.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6 B:2
• Conservation: PhyloP100: 2.52

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 -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.14706632).
• BP6: Variant 2-47480804-A-G is Benign according to our data. Variant chr2-47480804-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 91003.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=6, Likely_benign=1, Benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSH2	NM_000251.3	c.2567A>G	p.Tyr856Cys	missense_variant	15/16	ENST00000233146.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSH2	ENST00000233146.7	c.2567A>G	p.Tyr856Cys	missense_variant	15/16	1	NM_000251.3	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251450 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135892

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: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461818 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727210

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Lynch syndrome 1 Uncertain:4

Uncertain significance, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Mar 22, 2023	This variant is classified as a variant of uncertain significance as there is insufficient evidence to determine its impact on protein function and/or cancer risk. -
Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 31, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Feb 08, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Division of Medical Genetics, University of Washington	Nov 25, 2019	To our knowledge, this sequence variant has not been previously reported in the literature. This variant has an overall allele frequency of 0.000004 in the Broad Institute gnomAD Browser (https://gnomad.broadinstitute.org/). In silico analyses indicate that this variant does not alter protein structure/function. Thus, it is unknown at this time whether this variant increases cancer risk. PM2; BP4 -

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Mar 12, 2024	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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Aug 06, 2018	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jul 30, 2020

DNA sequence analysis of the MSH2 gene demonstrated a sequence change, c.2567A>G, in exon 15 that results in an amino acid change, p.Tyr856Cys. This sequence change does not appear to have been previously described in patients with MSH2-related disorders and has been described in the gnomAD database in one individual, with a low overall population frequency of 0.0003% (dbSNP rs587779150). The p.Tyr856Cys change affects a poorly conserved amino acid residue located in a domain of the MSH2 protein that is known to be functional. The p.Tyr856Cys substitution appears to be benign using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL). Due to these contrasting evidences and the lack of functional studies, the clinical significance of the p.Tyr856Cys change remains unknown at this time. -

Hereditary nonpolyposis colorectal neoplasms Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Oct 07, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.067
BayesDel_addAF	Uncertain	0.037	T
BayesDel_noAF	Benign	-0.10
CADD	Benign	18
DANN	Benign	0.88
DEOGEN2	Benign	0.37	T;.;.;.
Eigen	Benign	-0.48
Eigen_PC	Benign	-0.36
FATHMM_MKL	Benign	0.62	D
LIST_S2	Benign	0.83	T;T;T;T
M_CAP	Benign	0.079	D
MetaRNN	Benign	0.15	T;T;T;T
MetaSVM	Benign	-0.51	T
MutationAssessor	Benign	0.34	N;.;.;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.3	N;N;.;N
REVEL	Uncertain	0.40
Sift	Benign	0.11	T;T;.;T
Sift4G	Benign	0.12	T;T;.;T
Polyphen		0.077	B;.;.;B
Vest4		0.27
MutPred		0.36		Loss of phosphorylation at Y856 (P = 0.029);.;Loss of phosphorylation at Y856 (P = 0.029);Loss of phosphorylation at Y856 (P = 0.029);
MVP		0.89
MPC		0.0060
ClinPred		0.088	T
GERP RS		3.6
Varity_R		0.16
gMVP		0.26

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: rs587779150; hg19: chr2-47707943; COSMIC: COSV51875935;