2-47471002-A-T

Variant names:

• chr2-47471002-A-T
• rs63751149
• NM_000251.3:c.1699A>T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000251.3(MSH2):​c.1699A>T​(p.Lys567*) variant causes a stop gained 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 Pathogenic (★★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MSH2 NM_000251.3 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:4
• Conservation: PhyloP100: 4.46

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 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-47471002-A-T is Pathogenic according to our data. Variant chr2-47471002-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 90753.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr2-47471002-A-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MSH2	NM_000251.3	c.1699A>T	p.Lys567*	stop_gained	Exon 11 of 16	ENST00000233146.7	NP_000242.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MSH2	ENST00000233146.7	c.1699A>T	p.Lys567*	stop_gained	Exon 11 of 16	1	NM_000251.3	ENSP00000233146.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 25

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: reviewed by expert panel

Submissions by phenotype

Lynch syndrome 1 Pathogenic:1

Jun 22, 2023

Neuberg Centre For Genomic Medicine, NCGM

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The observed stop gained c.1699A>T (p.Lys567Ter) variant in MSH2 gene has been previously reported in multiple individuals affected with MSH2-related disorders (Ewald et al., 2007; Li et al., 2022). The p.Lys567Ter variant is absent in gnomAD Exomes. This variant has been submitted to the ClinVar database as Pathogenic. Computational evidence (MutationTaster - Disease causing) predicts damaging effect on protein structure and function for this variant. The reference amino acid of p.Lys567Ter in MSH2 is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. This sequence change creates a premature translational stop signal (p.Lys567Ter) in the MSH2 gene. This variant is predicted to cause loss of normal protein function through protein truncation. Loss of function variants in MSH2 gene have been previously reported to be pathogenic (Mangold et al., 2005). For these reasons, this variant has been classified as Pathogenic. -

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

Coding sequence variation introducing premature termination codon -

Hereditary nonpolyposis colorectal neoplasms Pathogenic:1

Jul 17, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Lys567*) in the MSH2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in MSH2 are known to be pathogenic (PMID: 15849733, 24362816). For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 90753). This premature translational stop signal has been observed in individual(s) with clinical features of Lynch syndrome (PMID: 17440950, 21642682). This variant is not present in population databases (ExAC no frequency). -

Hereditary cancer-predisposing syndrome Pathogenic:1

Mar 28, 2024

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.K567* pathogenic mutation (also known as c.1699A>T), located in coding exon 11 of the MSH2 gene, results from an A to T substitution at nucleotide position 1699. This changes the amino acid from a lysine to a stop codon within coding exon 11. This variant has been identified in multiple probands with Lynch syndrome-associated tumors; several which demonstrated high microsatellite instability and/or loss of MSH2 expression by immunohistochemistry (Ewald J et al. Br J Surg, 2007 Aug;94:1020-7; Bonadona V et al. JAMA, 2011 Jun;305:2304-10; Li Y et al. Cancer Biol Med, 2022 Jun;19:1235-48). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	44
DANN	Uncertain	1.0
Eigen	Pathogenic	0.95
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.95	D
Vest4		0.81
GERP RS		4.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs63751149; hg19: chr2-47698141;