chr12-32796167-G-T

Position:

chr12-32796167-G-T

Variant summary

Our verdict is Benign. Variant got -11 ACMG points: 2P and 13B. PM5BP4_StrongBP6BS1BS2

The NM_001005242.3(PKP2):c.2299C>A(p.Arg767Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000855 in 1,614,042 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R767C) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.00075 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00087 ( 7 hom. )

Consequence

PKP2
NM_001005242.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:18

Conservation

PhyloP100: 3.69

Variant links:

Genes affected

PKP2 (HGNC:9024): (plakophilin 2) This gene encodes a member of the arm-repeat (armadillo) and plakophilin gene families. Plakophilin proteins contain numerous armadillo repeats, localize to cell desmosomes and nuclei, and participate in linking cadherins to intermediate filaments in the cytoskeleton. This gene may regulate the signaling activity of beta-catenin and is required to maintain transcription of genes that control intracellular calcium cycling including ryanodine receptor 2, ankyrin-B, triadin, and calcium channel, voltage-dependent, L type, alpha 1C. Mutations in this gene are associated with different inherited cardiac conditions including Arrythmogenic Cardiomyopathy, Brugada Syndrome, and Idiopathic Ventricular Fibrillation. A processed pseudogene with high similarity to this gene has been mapped to chromosome 12p13. [provided by RefSeq, May 2022]

PKP2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -11 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr12-32796167-G-A is described in Lovd as [Likely_pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.020314664).

BP6

Variant 12-32796167-G-T is Benign according to our data. Variant chr12-32796167-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 45068.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=8, Uncertain_significance=2, Benign=5}. Variant chr12-32796167-G-T is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000749 (114/152206) while in subpopulation AMR AF= 0.000851 (13/15282). AF 95% confidence interval is 0.000664. There are 1 homozygotes in gnomad4. There are 45 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 114 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKP2	NM_001005242.3 link	c.2299C>A	p.Arg767Ser	missense_variant	11/13	ENST00000340811.9	NP_001005242.2	Q99959-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKP2	ENST00000340811.9 link	c.2299C>A	p.Arg767Ser	missense_variant	11/13	1	NM_001005242.3	ENSP00000342800.5		Q99959-2

Frequencies

GnomAD3 genomes

AF:

0.000743

AC:

113

AN:

152088

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000852

Gnomad ASJ

AF:

0.00807

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000622

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000838

Gnomad OTH

AF:

0.00240

GnomAD3 exomes

AF:

0.000907

AC:

228

AN:

251482

Hom.:

AF XY:

0.00101

AC XY:

137

AN XY:

135916

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.000694

Gnomad ASJ exome

AF:

0.00635

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000523

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000967

Gnomad OTH exome

AF:

0.00163

GnomAD4 exome

AF:

0.000866

AC:

1266

AN:

1461836

Hom.:

Cov.:

AF XY:

0.000920

AC XY:

669

AN XY:

727226

show subpopulations

Gnomad4 AFR exome

AF:

0.000209

Gnomad4 AMR exome

AF:

0.000805

Gnomad4 ASJ exome

AF:

0.00880

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000626

Gnomad4 FIN exome

AF:

0.0000562

Gnomad4 NFE exome

AF:

0.000730

Gnomad4 OTH exome

AF:

0.00136

GnomAD4 genome

AF:

0.000749

AC:

114

AN:

152206

Hom.:

Cov.:

AF XY:

0.000605

AC XY:

AN XY:

74402

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.000851

Gnomad4 ASJ

AF:

0.00807

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000831

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000838

Gnomad4 OTH

AF:

0.00237

Alfa

AF:

0.00137

Hom.:

Bravo

AF:

0.000945

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000581

AC:

ExAC

AF:

0.000865

AC:

105

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:18

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 9

Uncertain:1Benign:5

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Aug 02, 2019	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -
Likely benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2025	- -
Likely benign, criteria provided, single submitter	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	Jun 09, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	May 31, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -

not provided

Benign:5

Likely benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Sep 01, 2024	PKP2: BS2 -
Benign, criteria provided, single submitter	clinical testing	GeneDx	May 24, 2018	This variant is associated with the following publications: (PMID: 25637381, 20400443, 20857253, 23299917, 23810883, 24832006, 20829228, 23861362, 25351510, 26743238, 26656175, 26332594, 28341588, 29582136, 30731207, 31402444) -

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Aug 01, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jun 12, 2023	Variant summary: PKP2 c.2431C>A (p.Arg811Ser) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0009 in 253076 control chromosomes (gnomAD, Fressart_2010, Klauke_2010, Tan_2010), including 1 homozygote in the gnomAD database. The observed variant frequency is approximately 1.4 fold of the estimated maximal expected allele frequency for a pathogenic variant in PKP2 causing Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy (0.00065), suggesting that the variant is benign. c.2431C>A has been reported in the literature in individuals affected with ARVD and other cardiological phenotypes (Fressart_2010, Klauke_2010, Tan_2010, Bottillo_2016, Proost_2017, Chua_2018, Sahlin_2019), however without strong evidence for pathogenicity (i.e. lack of co-segregation data), these reports do not provide unequivocal conclusions about association of the variant with Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy. In addition, co-occurrences with other pathogenic variants have been reported in the literature (MYBPC3 c.3192dup (p.Lys1065fsX12), Bottillo_2016; DSG2 c.137G>A, p.Arg46Gln, Fressart_2010), providing supporting evidence for a benign role. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 24832006, 23299917, 26656175, 29582136, 20400443, 20829228, 23810883, 28341588, 30615648, 20857253). Eleven ClinVar submitters have assessed the variant since 2014: one classified the variant as uncertain significance, seven as likely benign, and three as benign. Based on the evidence outlined above, the variant was classified as benign. -

Arrhythmogenic right ventricular cardiomyopathy

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Sep 26, 2024	- -
Benign, criteria provided, single submitter	research	Biesecker Lab/Clinical Genomics Section, National Institutes of Health	Jun 24, 2013	- -

Cardiomyopathy

Benign:2

Benign, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Mar 03, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Apr 10, 2018	- -

Long QT syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

research

Dept of Medical Biology, Uskudar University

Jan 08, 2024

Criteria: BS1, PP3 -

Familial isolated arrhythmogenic right ventricular dysplasia

Uncertain:1

Uncertain significance, no assertion criteria provided

research

CSER _CC_NCGL, University of Washington

Jun 01, 2014

- -

PKP2-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 30, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 30, 2018

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.57

BayesDel_addAF

Benign

-0.099

BayesDel_noAF

Uncertain

0.020

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.57

.;D

Eigen

Uncertain

0.24

Eigen_PC

Uncertain

0.30

FATHMM_MKL

Uncertain

0.82

LIST_S2

Benign

0.79

T;T

M_CAP

Uncertain

0.099

MetaRNN

Benign

0.020

T;T

MetaSVM

Benign

-0.64

MutationAssessor

Pathogenic

3.0

.;M

PrimateAI

Uncertain

0.52

PROVEAN

Uncertain

-3.2

D;D

REVEL

Benign

0.26

Sift

Uncertain

0.0080

D;D

Sift4G

Uncertain

0.024

D;D

Polyphen

0.27

B;B

Vest4

0.81

MVP

0.73

MPC

0.54

ClinPred

0.088

GERP RS

5.1

Varity_R

0.34

gMVP

0.59

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