rs397516986

Positions:

chr12-32868965-G-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_001005242.3(PKP2):c.1132C>T(p.Gln378Ter) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000496 in 1,613,738 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 Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. Q378Q) has been classified as Benign. Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

PKP2
NM_001005242.3 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:10

Conservation

PhyloP100: 5.89

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 Pathogenic. Variant got 16 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP5

Variant 12-32868965-G-A is Pathogenic according to our data. Variant chr12-32868965-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 45010.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-32868965-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKP2	NM_001005242.3 linkuse as main transcript	c.1132C>T	p.Gln378Ter	stop_gained	4/13	ENST00000340811.9	NP_001005242.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKP2	ENST00000340811.9 linkuse as main transcript	c.1132C>T	p.Gln378Ter	stop_gained	4/13	1	NM_001005242.3	ENSP00000342800	P1	Q99959-2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152258

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251360

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135868

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:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000479

AC:

AN:

1461480

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727072

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:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000450

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152258

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74390

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:10

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 9

Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 29, 2023	This sequence change creates a premature translational stop signal (p.Gln378*) in the PKP2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PKP2 are known to be pathogenic (PMID: 15489853, 23911551). This variant is present in population databases (rs397516986, gnomAD 0.002%). This premature translational stop signal has been observed in individual(s) with arrhythmogenic right ventricular cardiomyopathy (PMID: 19880068, 23514727, 27532257). ClinVar contains an entry for this variant (Variation ID: 45010). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Johns Hopkins Genomics, Johns Hopkins University	Jul 26, 2019	- -
Pathogenic, criteria provided, single submitter	clinical testing	Victorian Clinical Genetics Services, Murdoch Childrens Research Institute	Feb 02, 2022	Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with arrhythmogenic right ventricular dysplasia 9 (ARVD9; MIM#609040). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0112 - The condition associated with this gene has incomplete penetrance (PMID: 17010805, 23183494). (I) 0115 - Variants in this gene are known to have variable expressivity (PMID: 17010805, 23183494). (I) 0201 - Variant is predicted to cause nonsense-mediated decay (NMD) and loss of protein (premature termination codon is located at least 54 nucleotides upstream of the final exon-exon junction). (SP) 0251 - This variant is heterozygous. (I) 0302 - Variant is present in gnomAD (v2) <0.001 for a dominant condition (2 heterozygotes, 0 homozygotes). (SP) 0701 - Other variants predicted to cause NMD comparable to the one identified in this case have very strong previous evidence for pathogenicity (DECIPHER). (SP) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals (ClinVar). (SP) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Sep 11, 2019	- -

not provided

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	AiLife Diagnostics, AiLife Diagnostics	Nov 09, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Dec 08, 2022	Reported in multiple unrelated individuals from different ethnic backgrounds in association with ARVC (Watkins et al., 2009; Fressart et al., 2010; Bhonsale et al., 2013; Ohno et al., 2013; Philips et al., 2014; Groeneweg et al., 2015; Torkamani et al., 2016; Walsh et al., 2017; Sonoda et al., 2017; Wada et al., 2017); Not observed at a significant frequency in large population cohorts (gnomAD); Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 24585727, 34120153, 23973953, 28588093, 31386562, 31402444, 19880068, 20400443, 23514727, 23671136, 27727376, 27532257, 28431057, 25820315, 29178656, 30790397, 33087929) -

Cardiomyopathy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Jun 21, 2022

This variant changes 1 nucleotide in exon 4 of the PKP2 gene, creating a premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant has been reported in more than 15 individuals affected with arrhythmogenic right ventricular cardiomyopathy (PMID: 19880068, 20400443, 23514727, 23671136, 24585727, 25820315, 27532257, 27727376, 28431057, 28588093, 29178656). This variant has been identified in 2/282774 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of PKP2 function is a known mechanism of disease. Based on the available evidence, this variant is classified as Pathogenic. -

Arrhythmogenic right ventricular cardiomyopathy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Oct 24, 2018

The p.Gln378X variant in PKP2 has been identified in >15 individuals with ARVC ( Watkins 2009, Fressart 2010, Bhonsale 2013, Kumar 2013 Ohno 2013, Kumar 2013, Ph ilips 2014, Groeneweg 2015, Torkamani 2016, Sonoda 2017, Wada 2017, Orgeron 2017 , LMM data) and was reported to be de novo in 1 case (Horie 2008). It has also b een reported by other clinical laboratories in ClinVar (Variation ID # 45010) an d has been identified in 2/129154 European chromosomes by gnomAD (http://gnomad. broadinstitute.org). This nonsense variant leads to a premature termination codo n at position 378, which is predicted to lead to a truncated or absent protein. Loss of function of the PKP2 gene is an established disease mechanism in in indi viduals autosomal dominant ARVC. In summary, this variant meets criteria to be c lassified as pathogenic for autosomal dominant ARVC. ACMG/AMP criteria applied: PVS1, PS4, PM2, PM6. -

Cardiovascular phenotype

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 26, 2019

The p.Q378* pathogenic mutation (also known as c.1132C>T), located in coding exon 4 of the PKP2 gene, results from a C to T substitution at nucleotide position 1132. This changes the amino acid from a glutamine to a stop codon within coding exon 4. This alteration has been reported in multiple unrelated individuals with confirmed or suspected arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) (Philips B et al. Circ Arrhythm Electrophysiol. 2014;7(2):230-6; Kumar S et al. Heart Rhythm. 2013; 10(11):1653-60; Ohno S et al. Circ J. 2013;77(6):1534-42; Fressart V et al. Europace. 2010;12(6):861-8; Watkins DA et al. Heart Rhythm. 2009;6(11 Suppl):S10-7). 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. -

Familial isolated arrhythmogenic right ventricular dysplasia

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

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

Jul 08, 2024

Variant summary: PKP2 c.1132C>T (p.Gln378X) 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. The variant allele was found at a frequency of 4e-06 in 251360 control chromosomes. c.1132C>T has been reported in the literature in at least one individual affected with Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy (e.g. Ohno_2013). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication has been ascertained in the context of this evaluation (PMID: 23514727). ClinVar contains an entry for this variant (Variation ID: 45010). Based on the evidence outlined above, the variant was classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Pathogenic

0.62

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

0.91

FATHMM_MKL

Uncertain

0.96

MutationTaster

Benign

1.0

A;A

Vest4

0.88

GERP RS

5.0

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

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