chr12-32822549-A-G

Position:

chr12-32822549-A-G

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM1BP4BS2

The NM_001005242.3(PKP2):c.1757T>C(p.Ile586Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000274 in 1,461,744 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

PKP2
NM_001005242.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 0.269

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 Likely_benign. Variant got -3 ACMG points.

PM1

In a repeat ARM 4 (size 45) in uniprot entity PKP2_HUMAN there are 6 pathogenic changes around while only 1 benign (86%) in NM_001005242.3

BP4

Computational evidence support a benign effect (MetaRNN=0.3319698).

BS2

High AC in GnomAdExome4 at 40 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKP2	NM_001005242.3 linkuse as main transcript	c.1757T>C	p.Ile586Thr	missense_variant	8/13	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.1757T>C	p.Ile586Thr	missense_variant	8/13	1	NM_001005242.3	ENSP00000342800	P1	Q99959-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251296

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135816

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:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000274

AC:

AN:

1461744

Hom.:

Cov.:

AF XY:

0.0000261

AC XY:

AN XY:

727184

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000351

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000413

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 15, 2011

Variant classified as Uncertain Significance - Favor Benign. The Ile630Thr varia nt has not been reported in the literature. It has been detected in 1/200 Caucas ian probands tested by our laboratory. This proband had dilated cardiomyopathy a nd carried a second variant in the MYH7 gene, which precludes an assessment of t he possible contribution of the Ile630Thr variant to disease. (Isoleucine (Ile) at position 630 is incompletely conserved in evolution (of the available species , opossum and zebrafish carry a different amino acid), raising the possibility t hat a change may be tolerated. In addition, 3 out of 4 computational tools (Alig n GVGD, SIFT, MAPP) predict the change to be tolerated (Polyphen2 predicts a pos sibly damaging effect). Finally, missense variants constitute the minority of va riants detected in ARVC patients (23% in our laboratory) and their clinical sign ificance has been questioned by some (Christensen 2009). In summary, additional studies are needed to determine the clinical significance of this variant. -

Arrhythmogenic right ventricular dysplasia 9

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 23, 2023

This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 630 of the PKP2 protein (p.Ile630Thr). This variant is present in population databases (rs397517011, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with PKP2-related conditions. ClinVar contains an entry for this variant (Variation ID: 45048). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬† is likely to be tolerated. 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. -

Arrhythmogenic right ventricular cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Oct 30, 2023

This missense variant replaces isoleucine with threonine at codon 630 of the PKP2 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual affected with dilated cardiomyopathy (PMID: 24503780, 27532257). This variant has been identified in 3/251296 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Feb 28, 2023

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Mayo Clinic Laboratories, Mayo Clinic

Nov 17, 2021

- -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 05, 2019

The c.1889T>C (p.I630T) alteration is located in exon 9 (coding exon 9) of the PKP2 gene. This alteration results from a T to C substitution at nucleotide position 1889, causing the isoleucine (I) at amino acid position 630 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.029

BayesDel_noAF

Benign

-0.22

CADD

Benign

DANN

Benign

0.83

DEOGEN2

Benign

0.17

.;T

Eigen

Benign

0.082

Eigen_PC

Benign

0.14

FATHMM_MKL

Uncertain

0.89

LIST_S2

Benign

0.71

T;T

M_CAP

Uncertain

0.14

MetaRNN

Benign

0.33

T;T

MetaSVM

Benign

-0.54

MutationAssessor

Benign

1.9

.;M

MutationTaster

Benign

0.81

D;N

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.98

N;N

REVEL

Uncertain

0.29

Sift

Benign

0.19

T;T

Sift4G

Benign

1.0

T;T

Polyphen

0.80

P;P

Vest4

0.44

MVP

0.81

MPC

0.28

ClinPred

0.18

GERP RS

3.8

Varity_R

0.061

gMVP

0.50

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