rs1555144459

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_001005242.3(PKP2):​c.1545_1546insT​(p.Gly516TrpfsTer12) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 32)

Consequence

PKP2
NM_001005242.3 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: -0.633
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]

Genome browser will be placed here

ACMG classification

Classification made for transcript

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 12-32841038-C-CA is Pathogenic according to our data. Variant chr12-32841038-C-CA is described in ClinVar as [Likely_pathogenic]. Clinvar id is 517335.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
PKP2NM_001005242.3 linkuse as main transcriptc.1545_1546insT p.Gly516TrpfsTer12 frameshift_variant 6/13 ENST00000340811.9 NP_001005242.2

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
PKP2ENST00000340811.9 linkuse as main transcriptc.1545_1546insT p.Gly516TrpfsTer12 frameshift_variant 6/131 NM_001005242.3 ENSP00000342800 P1Q99959-2

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD4 exome
Cov.:
31
GnomAD4 genome
Cov.:
32

ClinVar

Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 9 Pathogenic:2
Likely pathogenic, criteria provided, single submitterclinical testing;provider interpretationGeisinger Autism and Developmental Medicine Institute, Geisinger Health SystemNov 27, 2017This 6 year old male with autism spectrum disorder was found to carry a paternally-inherited expected pathogenic variant in the PKP2 gene, which confers an increased risk of developing arrhythmogenic right ventricular cardiomyopathy. Given his age, we would not expect him to exhibit any features of the condition at this time, though a cardiac evaluation is pending. The patient's father's cardiac MRI has thus far been normal; he is 31 years old at time of report and cardiac evaluation. -
Pathogenic, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpOct 12, 2019This sequence change creates a premature translational stop signal (p.Gly560Trpfs*12) in the PKP2 gene. It is expected to result in an absent or disrupted protein product. For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in PKP2 are known to be pathogenic (PMID: 15489853, 23911551). This variant has not been reported in the literature in individuals with PKP2-related disease. ClinVar contains an entry for this variant (Variation ID: 517335). This variant is not present in population databases (ExAC no frequency). -
Cardiomyopathy Pathogenic:1
Likely pathogenic, criteria provided, single submitterclinical testingLaboratory for Molecular Medicine, Mass General Brigham Personalized MedicineApr 28, 2017The p.Gly560fs variant in PKP2 has not been previously reported in individuals w ith cardiomyopathy or in large population studies, though the ability of these s tudies to accurately detect indels may be limited. This variant is predicted to cause a frameshift, which alters the protein?s amino acid sequence beginning at position 560 and leads to a premature termination codon 12 amino acids downstrea m. This alteration is then predicted to lead to a truncated or absent protein. F rameshift and other truncating variants in PKP2 are strongly associated with arr hythmogenic right ventricular cardiomyopathy. In summary, although additional st udies are required to fully establish its clinical significance, the p.Gly560fs variant is likely pathogenic. -
Cardiovascular phenotype Pathogenic:1
Pathogenic, criteria provided, single submitterclinical testingAmbry GeneticsMay 26, 2023The c.1677dupT pathogenic mutation, located in coding exon 7 of the PKP2 gene, results from a duplication of T at nucleotide position 1677, causing a translational frameshift with a predicted alternate stop codon (p.G560Wfs*12). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). 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. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction

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.

Other links and lift over

dbSNP: rs1555144459; hg19: chr12-32993972; API