rs267608156

chr7-5989867-C-CA

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000535.7(PMS2):c.1076_1077insT(p.Leu359PhefsTer6) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PMS2 NM_000535.7 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:11
• Conservation: PhyloP100: 8.98

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 7-5989867-C-CA is Pathogenic according to our data. Variant chr7-5989867-C-CA is described in ClinVar as [Pathogenic]. Clinvar id is 91289.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PMS2	NM_000535.7	c.1076_1077insT	p.Leu359PhefsTer6	frameshift_variant	10/15	ENST00000265849.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PMS2	ENST00000265849.12	c.1076_1077insT	p.Leu359PhefsTer6	frameshift_variant	10/15	1	NM_000535.7	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:11

Revision: reviewed by expert panel

Submissions by phenotype

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Feb 06, 2024	- -
Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2023	PMS2: PVS1, PM2 -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 26, 2017	This duplication of one nucleotide in PMS2 is denoted c.1076dupT at the cDNA level and p.Leu359PhefsX6 (L359FfsX6) at the protein level. The normal sequence, with the base that is duplicated in brackets, is TCTT[dupT]GATA. The duplication causes a frameshift which changes a Leucine to a Phenylalanine at codon 359, and creates a premature stop codon at position 6 of the new reading frame. This variant is predicted to cause loss of normal protein function through either protein truncation or nonsense-mediated mRNA decay. PMS2 c.1076dupT has been observed in at least three individuals with a personal history of colon and/or endometrial cancer (Senter 2008, Goodenberger 2016). We consider this variant to be pathogenic. -

Lynch syndrome 4 Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Sep 20, 2023	This variant is considered pathogenic. This variant creates a frameshift predicted to result in premature protein truncation. -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	May 28, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	MGZ Medical Genetics Center	Mar 23, 2022	- -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Aug 09, 2021	The c.1076dupT pathogenic mutation, located in coding exon 10 of the PMS2 gene, results from a duplication of T at nucleotide position 1076, causing a translational frameshift with a predicted alternate stop codon (p.L359Ffs*6). This alteration (designated c.1076_1077insT) was reported in an individual diagnosed with endometrial cancer showing loss of PMS2 expression at age 49 and also with colon cancer at age 57 (Senter L et al. Gastroenterology 2008 Aug;135:419-28). This mutation has also been identified in other affected and unaffected individuals with Lynch syndrome (Goodenberger ML et al. Genet. Med. 2016 Jan;18:13-9). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -
Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jan 15, 2020	This variant inserts 1 nucleotide in exon 10 of the PMS2 gene, creating a frameshift and premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Loss of PMS2 function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -

Hereditary nonpolyposis colon cancer Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

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

Mar 15, 2023

Variant summary: PMS2 c.1076dupT (p.Leu359PhefsX6) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 251064 control chromosomes (gnomAD). c.1076dupT has been reported in the literature in at least three individuals affected with Lynch Syndrome-associated cancers, including at least one individual with a personal and family history of Lynch Syndrome-associated cancers and a loss of PMS2 determined by immunohistochemistry (e.g. Senter_2008, Goodenberger_2015, Lowery_2018, ten Broeke_2018). These data indicate that the variant is likely associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Six submitters have provided clinical-significance assessments for this variant to ClinVar after 2014 and all classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Lynch syndrome Pathogenic:1

Pathogenic, reviewed by expert panel

research

International Society for Gastrointestinal Hereditary Tumours (InSiGHT)

Sep 05, 2013

Coding sequence variation resulting in a stop codon -

Hereditary nonpolyposis colorectal neoplasms Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Dec 20, 2022

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 91289). This premature translational stop signal has been observed in individual(s) with Lynch syndrome (PMID: 18602922, 23012243). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Leu359Phefs*6) in the PMS2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PMS2 are known to be pathogenic (PMID: 21376568, 24362816). -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs267608156; hg19: chr7-6029498;