chr7-5978607-A-G

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_000535.7(PMS2):c.2264T>C(p.Ile755Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000199 in 150,456 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000069 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

PMS2
NM_000535.7 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:10

Conservation

PhyloP100: 8.54

Variant links:

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]

PMS2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.775

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PMS2	NM_000535.7 link	c.2264T>C	p.Ile755Thr	missense_variant	Exon 13 of 15	ENST00000265849.12	NP_000526.2	P54278-1Q7Z3Q2B4DGM0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PMS2	ENST00000265849.12 link	c.2264T>C	p.Ile755Thr	missense_variant	Exon 13 of 15	1	NM_000535.7	ENSP00000265849.7		P54278-1

Frequencies

GnomAD3 genomes

AF:

0.0000199

AC:

AN:

150456

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000660

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000296

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000120

AC:

AN:

249476

Hom.:

AF XY:

0.00000741

AC XY:

AN XY:

134862

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000465

Gnomad NFE exome

AF:

0.0000178

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.00000689

AC:

AN:

1452372

Hom.:

Cov.:

AF XY:

0.00000830

AC XY:

AN XY:

722456

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000190

Gnomad4 NFE exome

AF:

0.00000633

Gnomad4 OTH exome

AF:

0.0000167

GnomAD4 genome

AF:

0.0000199

AC:

AN:

150456

Hom.:

Cov.:

AF XY:

0.0000136

AC XY:

AN XY:

73408

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000660

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000296

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:10

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:5

Sep 13, 2014

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is denoted PMS2 c.2264T>C at the cDNA level, p.Ile755Thr (I755T) at the protein level, and results in the change of an Isoleucine to a Threonine (ATC>ACC). This variant has not, to our knowledge, been published in the literature as pathogenic or benign. PMS2 Ile755Thr was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. Since Isoleucine and Threonine differ in polarity, charge, size or other properties, this is considered a non-conservative amino acid substitution. PMS2 Ile755Thr occurs at a position that is conserved across species and is located in the C-terminal nuclease domain (Fukui 2012). In silico analyses predict that this variant is probably damaging to protein structure and function. Based on currently available information, it is unclear whether PMS2 Ile755Thr is pathogenic or benign. We consider it to be a variant of uncertain significance. -

Jan 25, 2016

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The c.2264T>C variant affects a conserved nucleotide, resulting in amino acid change from Ile to Thr. 4/4 in-silico tools predict damaging outcome for this variant (SNPs&GO not captured due to low reliability index). 5/5 programs in Alamut predict that this variant does not affect normal splicing. ESE finder predicts that this variant may create multiple ESE sites. However, these predictions are not confirmed by experimental studies. This variant has been reported in one patient with colon cancer (Carneiro da Silva_2015), but not found in 114882 control chromosomes. Because of the insufficient evidence and the lack of functional studies, the variant was classified as a variant of uncertain significance (VUS) until additional information becomes available. -

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The PMS2 p.Ile755Thr variant was identified in 3 of 3098 proband chromosomes (frequency: 0.001) from individuals or families with Lynch syndrome (Carneiro da Silva 2015, Johnston 2012, Rossi 2017). The variant was also identified in dbSNP (ID: rs386833410) as "With Uncertain significance allele", and in ClinVar (classified as uncertain significance by GeneDx and three other submitters). The variant was identified in control databases in 3 of 244428 chromosomes at a frequency of 0.00001 (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: European in 2 of 110452 chromosomes (freq: 0.00002), Finnish in 1 of 22160 chromosomes (freq: 0.00005), while the variant was not observed in the African, Other, Latino, Ashkenazi Jewish, East Asian, and South Asian populations. The p.Ile755 residue is conserved in mammals but not in more distantly related organisms, and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) suggest that the variant may impact the protein; however, this information is not predictive enough to assume pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Jul 13, 2012

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: research

- -

Nov 03, 2021

Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary cancer-predisposing syndrome

Uncertain:3

Jun 03, 2022

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces isoleucine with threonine at codon 755 of the PMS2 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with Lynch syndrome (PMID: 26437257). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Sep 01, 2021

Sema4, Sema4

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Jul 20, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.I755T variant (also known as c.2264T>C), located in coding exon 13 of the PMS2 gene, results from a T to C substitution at nucleotide position 2264. The isoleucine at codon 755 is replaced by threonine, an amino acid with similar properties. This variant has been reported in a Brazilian individual who met Bethesda guidelines and was diagnosed at age 39 with colon cancer that demonstrated normal mismatch repair protein expression by immunohistochemistry (Carneiro da Silva F et al. PLoS One, 2015 Oct;10:e0139753; Rossi BM et al. BMC Cancer, 2017 Sep;17:623; de Angelis de Carvalho N et al. Cancers (Basel), 2020 Jul;12). This variant was detected as a secondary finding in 1 out of 572 ClinSeq participants, unselected for personal or family history of cancer, who underwent exome sequencing; however, clinical information for this particular individual was not provided (Johnston JJ et al. Am J Hum Genet, 2012 Jul;91:97-108; Pinard A et al. Hum Mutat, 2016 12;37:1299-1307). This variant was also observed in 1/3251 individuals who met eligibility criteria for hereditary breast and ovarian cancer syndrome (Lerner-Ellis J et al. J Cancer Res Clin Oncol, 2021 Mar;147:871-879). This amino acid position is well conserved in available vertebrate species. 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. -

Breast and/or ovarian cancer

Uncertain:1

Sep 16, 2022

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Lynch syndrome

Uncertain:1

Jul 02, 2018

Mendelics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.27

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Uncertain

0.090

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.22

T;.;.;.;.;.

Eigen

Uncertain

0.47

Eigen_PC

Uncertain

0.42

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Uncertain

0.91

D;D;.;D;.;D

M_CAP

Benign

0.079

MetaRNN

Pathogenic

0.78

D;D;D;D;D;D

MetaSVM

Uncertain

0.28

MutationAssessor

Uncertain

2.6

M;.;.;.;.;.

PrimateAI

Uncertain

0.63

PROVEAN

Uncertain

-3.4

D;D;.;.;.;D

REVEL

Uncertain

0.64

Sift

Benign

0.036

D;T;.;.;.;D

Sift4G

Uncertain

0.0020

D;D;.;.;.;D

Polyphen

0.65

P;D;.;.;D;P

Vest4

0.89

MutPred

0.57

Loss of stability (P = 0.0136);.;.;.;.;.;

MVP

0.89

MPC

3.7

ClinPred

0.94

GERP RS

5.7

Varity_R

0.42

gMVP

0.63

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over