chr2-158533189-C-T

Position:

• chr2-158533189-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_003628.6(PKP4):​c.5C>T​(p.Pro2Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,458,338 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PKP4 NM_003628.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.76

Genes affected

PKP4 (HGNC:9026): (plakophilin 4) Armadillo-like proteins are characterized by a series of armadillo repeats, first defined in the Drosophila 'armadillo' gene product, that are typically 42 to 45 amino acids in length. These proteins can be divided into subfamilies based on their number of repeats, their overall sequence similarity, and the dispersion of the repeats throughout their sequences. Members of the p120(ctn)/plakophilin subfamily of Armadillo-like proteins, including CTNND1, CTNND2, PKP1, PKP2, PKP4, and ARVCF. PKP4 may be a component of desmosomal plaque and other adhesion plaques and is thought to be involved in regulating junctional plaque organization and cadherin function. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2015]

PKP4 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.819

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKP4	NM_003628.6	c.5C>T	p.Pro2Leu	missense_variant	2/22	ENST00000389759.8	NP_003619.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKP4	ENST00000389759.8	c.5C>T	p.Pro2Leu	missense_variant	2/22	1	NM_003628.6	ENSP00000374409.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1458338 Hom.: 0 Cov.: 31 AF XY: 0.00000276 AC XY: 2 AN XY: 725288

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: 9.00e-7

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 22, 2024

The p.P2L variant (also known as c.5C>T), located in coding exon 1 of the PKP4 gene, results from a C to T substitution at nucleotide position 5. The proline at codon 2 is replaced by leucine, an amino acid with similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.55
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.090
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.094	T;.;T;.
Eigen	Uncertain	0.67
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.96	D;D;D;D
M_CAP	Benign	0.063	D
MetaRNN	Pathogenic	0.82	D;D;D;D
MetaSVM	Uncertain	0.26	D
MutationAssessor	Uncertain	2.0	.;M;M;.
PrimateAI	Uncertain	0.75	T
PROVEAN	Uncertain	-2.8	.;D;D;.
REVEL	Uncertain	0.51
Sift	Uncertain	0.0010	.;D;D;.
Sift4G	Uncertain	0.0040	D;D;D;D
Polyphen		1.0, 0.99	.;D;D;.
Vest4		0.78
MutPred		0.27		Loss of catalytic residue at P2 (P = 0.003);Loss of catalytic residue at P2 (P = 0.003);Loss of catalytic residue at P2 (P = 0.003);Loss of catalytic residue at P2 (P = 0.003);
MVP		0.89
MPC		0.68
ClinPred		0.99	D
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.23
gMVP		0.65

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

Other links and lift over

dbSNP: rs2043728044; hg19: chr2-159389701;