7-5977755-G-C

Position:

• chr7-5977755-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000535.7(PMS2):​c.2278C>G​(p.Pro760Ala) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 1/1 splice prediction tools predict no significant impact on normal splicing. 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. P760L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 30)
• Consequence: PMS2 NM_000535.7 missense, splice_region
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.64

Genes affected

PMS2 (HGNC:9122): (PMS1 homolog 2, mismatch repair system component) The protein encoded by this gene is a key component of the mismatch repair system that functions to correct DNA mismatches and small insertions and deletions that can occur during DNA replication and homologous recombination. This protein forms heterodimers with the gene product of the mutL homolog 1 (MLH1) gene to form the MutL-alpha heterodimer. The MutL-alpha heterodimer possesses an endonucleolytic activity that is activated following recognition of mismatches and insertion/deletion loops by the MutS-alpha and MutS-beta heterodimers, and is necessary for removal of the mismatched DNA. There is a DQHA(X)2E(X)4E motif found at the C-terminus of the protein encoded by this gene that forms part of the active site of the nuclease. Mutations in this gene have been associated with hereditary nonpolyposis colorectal cancer (HNPCC; also known as Lynch syndrome) and Turcot syndrome. [provided by RefSeq, Apr 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PMS2	NM_000535.7	c.2278C>G	p.Pro760Ala	missense_variant, splice_region_variant	14/15	ENST00000265849.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PMS2	ENST00000265849.12	c.2278C>G	p.Pro760Ala	missense_variant, splice_region_variant	14/15	1	NM_000535.7	P3

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 30

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 13, 2023

The p.P760A variant (also known as c.2278C>G), located in coding exon 14 of the PMS2 gene, results from a C to G substitution at nucleotide position 2278. The proline at codon 760 is replaced by alanine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Uncertain	0.040	T
BayesDel_noAF	Benign	-0.18
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.23	T;.;.;.;.;.
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.62
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	D;D;.;D;.;D
M_CAP	Benign	0.073	D
MetaRNN	Uncertain	0.57	D;D;D;D;D;D
MetaSVM	Uncertain	-0.0089	T
MutationAssessor	Benign	1.7	L;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Benign	0.41	T
PROVEAN	Pathogenic	-5.4	D;D;.;.;.;D
REVEL	Uncertain	0.38
Sift	Uncertain	0.0090	D;D;.;.;.;T
Sift4G	Benign	0.14	T;T;.;.;.;T
Polyphen		0.24	B;D;.;.;D;P
Vest4		0.51
MutPred		0.40		Loss of catalytic residue at N758 (P = 0.1159);.;.;.;.;.;
MVP		0.88
MPC		2.0
ClinPred		0.97	D
GERP RS		5.8
Varity_R		0.33
gMVP		0.44

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		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: chr7-6017386;