rs771695599

chr2-47475162-A-Cchr2-47475162-A-Gchr2-47475162-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_000251.3(MSH2):c.1897A>C(p.Ile633Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I633T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MSH2 NM_000251.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.19

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 Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 11 benign, 14 uncertain in NM_000251.3
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.115623534).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSH2	NM_000251.3	c.1897A>C	p.Ile633Leu	missense_variant	12/16	ENST00000233146.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSH2	ENST00000233146.7	c.1897A>C	p.Ile633Leu	missense_variant	12/16	1	NM_000251.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary nonpolyposis colorectal neoplasms Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 02, 2021

This sequence change replaces isoleucine with leucine at codon 633 of the MSH2 protein (p.Ile633Leu). The isoleucine residue is weakly conserved and there is a small physicochemical difference between isoleucine and leucine. 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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MSH2 protein function. This variant has not been reported in the literature in individuals affected with MSH2-related conditions. This variant is not present in population databases (ExAC no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.099
BayesDel_addAF	Uncertain	0.025	T
BayesDel_noAF	Benign	-0.20
Cadd	Benign	12
Dann	Benign	0.96
DEOGEN2	Benign	0.38	T;.;.;.
Eigen	Benign	-0.54
Eigen_PC	Benign	-0.41
FATHMM_MKL	Benign	0.40	N
LIST_S2	Benign	0.74	T;T;T;T
M_CAP	Benign	0.044	D
MetaRNN	Benign	0.12	T;T;T;T
MetaSVM	Benign	-0.80	T
MutationAssessor	Benign	0.70	N;.;.;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.43	N;N;.;N
REVEL	Benign	0.21
Sift	Benign	0.35	T;T;.;T
Sift4G	Benign	0.34	T;T;.;T
Polyphen		0.0	B;.;.;B
Vest4		0.40
MutPred		0.43		Loss of MoRF binding (P = 0.1069);.;Loss of MoRF binding (P = 0.1069);Loss of MoRF binding (P = 0.1069);
MVP		0.86
MPC		0.0066
ClinPred		0.11	T
GERP RS		3.6
Varity_R		0.12
gMVP		0.51

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-47702301;