2-47463052-G-C

Variant names:

• chr2-47463052-G-C
• rs1391167729
• NM_000251.3:c.1408G>C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PM5 PP3_Moderate

The NM_000251.3(MSH2):​c.1408G>C​(p.Val470Leu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V470E) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MSH2 NM_000251.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.37

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_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.885

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MSH2	NM_000251.3	c.1408G>C	p.Val470Leu	missense_variant	Exon 9 of 16	ENST00000233146.7	NP_000242.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MSH2	ENST00000233146.7	c.1408G>C	p.Val470Leu	missense_variant	Exon 9 of 16	1	NM_000251.3	ENSP00000233146.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary nonpolyposis colorectal neoplasms Uncertain:1

Apr 04, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with MSH2-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces valine with leucine at codon 470 of the MSH2 protein (p.Val470Leu). The valine residue is moderately conserved and there is a small physicochemical difference between valine and leucine. -

Hereditary cancer-predisposing syndrome Uncertain:1

Feb 11, 2025

Molecular Diagnostics Laboratory, Catalan Institute of Oncology

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM2_Supporting, BS3 c.1408G>C, located in exon 9 of the MSH2 gene, is predicted to result in the substitution of Val by Leu at codon 470, p.(Val470Leu).It is not present in the population database gnomAD v2.1.1, non cancer dataset (PM2_supporting). Computational tools for this variant suggests no significant impact on splicing but the effect of the variant on protein function is indeterminate (MAPP+PolyPhen-2 prior probability for pathogenicity: 0.18). A functional study based on cell viability assay in HEK293 or HAP1 cells using 6-TG treatment demonstrates normal function for this variant, with a LOF score -2,04 (PMID 33357406) (BS3).To our knowledge, relevant clinical data has not been reported for this variant. This variant has been reported in the ClinVar database (1x uncertain significance), but it has not been reported neither in InSiGHT nor in LOVD databases. Based on currently available information, the variant c.1408G>C should be considered an uncertain significance variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.88
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.14
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.61	D;.;.;.
Eigen	Uncertain	0.52
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.94	D;D;D;D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.88	D;D;D;D
MetaSVM	Uncertain	0.75	D
MutationAssessor	Uncertain	2.5	M;.;.;.
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-1.7	N;N;.;N
REVEL	Pathogenic	0.80
Sift	Uncertain	0.0060	D;D;.;D
Sift4G	Uncertain	0.011	D;D;.;D
Polyphen		0.88	P;.;.;P
Vest4		0.75
MutPred		0.79		Loss of methylation at K471 (P = 0.0391);.;Loss of methylation at K471 (P = 0.0391);Loss of methylation at K471 (P = 0.0391);
MVP		0.93
MPC		0.012
ClinPred		0.96	D
GERP RS		4.5
Varity_R		0.69
gMVP		0.58

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: rs1391167729; hg19: chr2-47690191;