2-47414405-T-C

Variant names:

• chr2-47414405-T-C
• rs63750640
• NM_000251.3:c.929T>C

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_000251.3(MSH2):​c.929T>C​(p.Leu310Pro) 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. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L310R) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 26)
• Consequence: MSH2 NM_000251.3 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:4
• Conservation: PhyloP100: 5.97

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 Pathogenic. Variant got 16 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-47414405-T-G is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant 2-47414405-T-C is Pathogenic according to our data. Variant chr2-47414405-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 91245.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr2-47414405-T-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MSH2	NM_000251.3	c.929T>C	p.Leu310Pro	missense_variant	Exon 5 of 16	ENST00000233146.7	NP_000242.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MSH2	ENST00000233146.7	c.929T>C	p.Leu310Pro	missense_variant	Exon 5 of 16	1	NM_000251.3	ENSP00000233146.2

Frequencies

GnomAD3 genomes Cov.: 26

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 26

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: reviewed by expert panel

Submissions by phenotype

Lynch syndrome Pathogenic:1

Sep 05, 2013

International Society for Gastrointestinal Hereditary Tumours (InSiGHT)

Significance: Pathogenic

Review Status: reviewed by expert panel

Collection Method: research

Multifactorial likelihood analysis posterior probability >0.99 -

Hereditary nonpolyposis colorectal neoplasms Pathogenic:1

Dec 14, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 310 of the MSH2 protein (p.Leu310Pro). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of Lynch syndrome (PMID: 10995807). ClinVar contains an entry for this variant (Variation ID: 91245). Advanced modeling performed at Invitae incorporating data from internal and/or published experimental studies (PMID: 33357406) indicates that this missense variant is expected to disrupt MSH2 function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects MSH2 function (PMID: 33357406). This variant disrupts the p.Leu310 amino acid residue in MSH2. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 22290698, 30374176). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Hereditary cancer-predisposing syndrome Pathogenic:1

May 08, 2024

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.L310P pathogenic mutation (also known as c.929T>C), located in coding exon 5 of the MSH2 gene, results from a T to C substitution at nucleotide position 929. The leucine at codon 310 is replaced by proline, an amino acid with similar properties. This alteration was identified in an individual whose Lynch-related tumor demonstrated loss of MSH2 expression on immunohistochemistry (IHC) and family history met Amsterdam criteria (Ambry internal data). In one study, this variant was detected in an individual diagnosed with rectal cancer at 39 years of age whose tumor showed high microsatellite instability (MSI-H) (Peel DJ et al. J Natl Cancer Inst, 2000 Sep;92:1517-22). In another study, c.929T>C was reported in an individual with MSI-H colon cancer diagnosed prior to 45 years of age; however, the amino acid substitution was reported as p.L310R (Perea J et al. Ann. Surg. Oncol., 2011 Nov;18:3285-91). This alteration was also identified as somatic along with a somatic MSH2 pathogenic mutation in a colon tumor that displayed loss of MSH2 and MSH6 on IHC (Ambry internal data). In an in vitro complementation assay, this variant was determined to be functionally deficient (Drost M et al. Genet Med, 2019 07;21:1486-1496). In a massively parallel cell-based functional assay testing susceptibility to a DNA damaging agent, 6-thioguanine (6-TG), this variant was determined to be functionally deleterious (Jia X et al. Am J Hum Genet, 2021 Jan;108:163-175). This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation. -

Muir-Torré syndrome;C2936783:Lynch syndrome 1;C5436806:Mismatch repair cancer syndrome 2 Pathogenic:1

Jun 17, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	26
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.93	D;.;.;.
Eigen	Pathogenic	0.86
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	D;D;D;D
M_CAP	Pathogenic	0.72	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.5	H;.;.;.
PrimateAI	Pathogenic	0.83	D
PROVEAN	Pathogenic	-6.5	D;D;.;D
REVEL	Pathogenic	0.97
Sift	Pathogenic	0.0	D;D;.;D
Sift4G	Pathogenic	0.0	D;D;.;D
Polyphen		1.0	D;.;.;D
Vest4		0.99
MutPred		0.94		Loss of stability (P = 0.0123);.;Loss of stability (P = 0.0123);Loss of stability (P = 0.0123);
MVP		0.99
MPC		0.029
ClinPred		1.0	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.99
gMVP		0.88

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: rs63750640; hg19: chr2-47641544;