7-5982986-G-C

Position:

• chr7-5982986-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000535.7(PMS2):​c.2012C>G​(p.Thr671Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 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. T671M) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000037 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: PMS2 NM_000535.7 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.70

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2450616).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PMS2	NM_000535.7	c.2012C>G	p.Thr671Arg	missense_variant	12/15	ENST00000265849.12	NP_000526.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PMS2	ENST00000265849.12	c.2012C>G	p.Thr671Arg	missense_variant	12/15	1	NM_000535.7	ENSP00000265849.7

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000366 AC: 5 AN: 1364472 Hom.: 0 Cov.: 22 AF XY: 0.00000590 AC XY: 4 AN XY: 678014

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: 0.00

Gnomad4 NFE exome AF: 0.00000480

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Mar 13, 2016

This variant is denoted PMS2 c.2012C>G at the cDNA level, p.Thr671Arg (T671R) at the protein level, and results in the change of a Threonine to an Arginine (ACG>AGG). This variant has not, to our knowledge, been published in the literature as pathogenic or benign. PMS2 Thr671Arg was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, suggesting it is not a common benign variant in these populations. Since Threonine and Arginine differ in some properties, this is considered a semi-conservative amino acid substitution. PMS2 Thr671Arg occurs at a position that is not conserved and is located in the Nuclease domain (Fukui 2011). In silico analyses predict that this variant is unlikely to alter protein structure or function. Based on currently available evidence, it is unclear whether PMS2 Thr671Arg is a pathogenic or benign variant. We consider it to be a variant of uncertain significance. -

Hereditary nonpolyposis colorectal neoplasms Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 15, 2021

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 PMS2 protein function. This variant has not been reported in the literature in individuals with PMS2-related conditions. ClinVar contains an entry for this variant (Variation ID: 234906). The frequency data for this variant in the population databases (ExAC) is considered unreliable due to the presence of homologous sequence, such as pseudogenes or paralogs, in the genome. This sequence change replaces threonine with arginine at codon 671 of the PMS2 protein (p.Thr671Arg). The threonine residue is weakly conserved and there is a moderate physicochemical difference between threonine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.099
BayesDel_addAF	Uncertain	0.052	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.10	T;.;.;.;.;.
Eigen	Benign	-0.0038
Eigen_PC	Benign	0.11
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.92	D;D;.;D;.;T
M_CAP	Benign	0.074	D
MetaRNN	Benign	0.25	T;T;T;T;T;T
MetaSVM	Benign	-0.39	T
MutationAssessor	Uncertain	2.2	M;.;.;.;.;.
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.87	N;N;.;.;.;N
REVEL	Benign	0.075
Sift	Benign	0.14	T;D;.;.;.;T
Sift4G	Benign	0.12	T;T;.;.;.;T
Polyphen		0.10	B;B;.;.;B;P
Vest4		0.30
MutPred		0.34		Gain of solvent accessibility (P = 0.024);.;.;.;.;.;
MVP		0.90
MPC		2.2
ClinPred		0.82	D
GERP RS		3.7
Varity_R		0.078
gMVP		0.35

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: rs587780046; hg19: chr7-6022617;