2-47466808-G-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Moderate

The NM_000251.3(MSH2):c.1661G>T(p.Ser554Ile) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S554C) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MSH2 NM_000251.3 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.96

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 12 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 8 benign, 16 uncertain in NM_000251.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-47466807-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 90718.Status of the report is reviewed_by_expert_panel, 3 stars.
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 2-47466808-G-T is Pathogenic according to our data. Variant chr2-47466808-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1777499.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSH2	NM_000251.3	c.1661G>T	p.Ser554Ile	missense_variant, splice_region_variant	10/16	ENST00000233146.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSH2	ENST00000233146.7	c.1661G>T	p.Ser554Ile	missense_variant, splice_region_variant	10/16	1	NM_000251.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 19, 2018

The c.1661G>T variant (also known as p.S554I), located in coding exon 10 of the MSH2 gene, results from a G to T substitution at nucleotide position 1661. This change occurs in the last base pair of coding exon 10, which makes it likely to have some effect on normal mRNA splicing. In addition to potential splicing impact, this alteration changes the serine at codon 554 to isoleucine, an amino acid with dissimilar properties. Two other alterations at the last base pair of coding exon 10, c.1661G>A and c.1661G>C, have been detected in families meeting Amsterdam criteria and RNA studies have demonstrated significant splicing impact (Kruger S et al. Hum Mutat. 2004;24(4):351-2; Perez-Cabornero L,Eur. J. Cancer 2009 May; 45(8):1485-93). This nucleotide position is highly conserved in available vertebrate species. Using the BDGP and ESEfinder splice site prediction tools, this alteration is predicted to abolish the native splice donor site; however, direct evidence is unavailable. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.14
Cadd	Pathogenic	33
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.75	D;.;.;.
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	D;D;D;D
M_CAP	Benign	0.053	D
MetaRNN	Uncertain	0.74	D;D;D;D
MetaSVM	Uncertain	0.33	D
MutationAssessor	Uncertain	2.9	M;.;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-4.0	D;D;.;D
REVEL	Pathogenic	0.69
Sift	Benign	0.050	D;T;.;T
Sift4G	Benign	0.14	T;T;.;T
Polyphen		0.054	B;.;.;B
Vest4		0.63
MutPred		0.62		Loss of disorder (P = 0.007);.;Loss of disorder (P = 0.007);Loss of disorder (P = 0.007);
MVP		0.91
MPC		0.0081
ClinPred		0.99	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.75
gMVP		0.48

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.97		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.97		Position offset: 0

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: chr2-47693947;