rs138538072

Positions:

chr12-32843272-C-T

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_004572.4(PKP2):c.1420G>A(p.Ala474Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000164 in 1,337,562 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict 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. A474V) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00064 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00010 ( 0 hom. )

Consequence

PKP2
NM_004572.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:8

Conservation

PhyloP100: -0.828

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:

PKP2 (HGNC:):

PKP2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0067751706).

BP6

Variant 12-32843272-C-T is Benign according to our data. Variant chr12-32843272-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 45024.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=6, Uncertain_significance=1, Benign=1}.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000644 (98/152254) while in subpopulation AFR AF= 0.00231 (96/41548). AF 95% confidence interval is 0.00194. There are 0 homozygotes in gnomad4. There are 44 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 98 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKP2	NM_001005242.3 linkuse as main transcript	c.1379-2067G>A		intron_variant		ENST00000340811.9	NP_001005242.2	Q99959-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKP2	ENST00000340811.9 linkuse as main transcript	c.1379-2067G>A		intron_variant		1	NM_001005242.3	ENSP00000342800.5		Q99959-2

Frequencies

GnomAD3 genomes

AF:

0.000651

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00234

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000184

AC:

AN:

244150

Hom.:

AF XY:

0.000174

AC XY:

AN XY:

132430

show subpopulations

Gnomad AFR exome

AF:

0.00235

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.0000997

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000452

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000103

AC:

122

AN:

1185308

Hom.:

Cov.:

AF XY:

0.0000950

AC XY:

AN XY:

589318

show subpopulations

Gnomad4 AFR exome

AF:

0.00291

Gnomad4 AMR exome

AF:

0.0000805

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000242

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000322

Gnomad4 OTH exome

AF:

0.000209

GnomAD4 genome

AF:

0.000644

AC:

AN:

152254

Hom.:

Cov.:

AF XY:

0.000591

AC XY:

AN XY:

74436

show subpopulations

Gnomad4 AFR

AF:

0.00231

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000574

Hom.:

Bravo

AF:

0.000971

ESP6500AA

AF:

0.00182

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000255

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:8

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jul 19, 2022	Variant summary: PKP2 c.1420G>A (p.Ala474Thr) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00018 in 244150 control chromosomes, predominantly at a frequency of 0.0024 within the African or African-American subpopulation in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 6 fold of the estimated maximal expected allele frequency for a pathogenic variant in PKP2 causing Arrhythmia phenotype (0.00043), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. c.1420G>A has been reported in the literature in individuals affected with dilated cardiomyopathy (Pugh_2014, Burstein_2020). These reports do not provide unequivocal conclusions about association of the variant with Arrhythmia. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four ClinVar submitters (evaluation after 2014) cite the variant as uncertain significance (n=1) and likely benign (n=3). Based on the evidence outlined above, the variant was classified as likely benign. -
Uncertain significance, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jul 17, 2012	Variant classified as Uncertain Significance - Favor Benign. The Ala474Thr varia nt in PKP2 has been identified in 7/3738 African American chromosomes from a bro ad population by the NHLBI Exome Sequencing Project (http://evs.gs.washington.ed u/EVS/; dbSNP rs138538072). Computational analyses (biochemical amino acid prope rties, conservation, AlignGVGD, and PolyPhen2) suggest that the Ala474Thr varian t may not impact the protein, though this information is not predictive enough t o rule out pathogenicity. This data supports that the Ala474Thr variant may be b enign but is insufficient to rule out a role in disease. Additional studies are needed to fully assess its clinical significance. -

Cardiomyopathy

Benign:2

Benign, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Nov 30, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jan 04, 2019	- -

Arrhythmogenic right ventricular dysplasia 9

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 29, 2024

- -

Arrhythmogenic right ventricular cardiomyopathy

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Feb 05, 2024

- -

PKP2-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 12, 2022

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). -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Jul 01, 2024

PKP2: BP4 -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 05, 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

Benign

0.099

BayesDel_addAF

Benign

-0.61

BayesDel_noAF

Benign

-0.65

CADD

Benign

1.8

DANN

Benign

0.76

DEOGEN2

Benign

0.097

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.0023

LIST_S2

Benign

0.67

M_CAP

Benign

0.0018

MetaRNN

Benign

0.0068

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.1

PrimateAI

Benign

0.32

PROVEAN

Benign

-0.070

REVEL

Benign

0.013

Sift

Benign

0.32

Sift4G

Benign

0.41

Polyphen

0.071

Vest4

0.10

MVP

0.32

MPC

0.15

ClinPred

0.0016

GERP RS

-1.4

Varity_R

0.028

gMVP

0.17

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