12-32896656-C-G

Variant names:

• chr12-32896656-C-G
• rs143004808
• NM_001005242.3:c.76G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001005242.3(PKP2):​c.76G>C​(p.Asp26His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000709 in 1,410,860 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D26N) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: PKP2 NM_001005242.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.68
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• arrhythmogenic right ventricular dysplasia 9

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• left ventricular noncompaction

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Brugada syndrome

  Inheritance: AD Classification: LIMITED Submitted by: Genomics England PanelApp
• Brugada syndrome 1

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• catecholaminergic polymorphic ventricular tachycardia

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• dilated cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ENSG00000309487 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001005242.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PKP2	NM_001005242.3	MANE Select	c.76G>C	p.Asp26His	missense	Exon 1 of 13	NP_001005242.2	Q99959-2
	PKP2	NM_004572.4		c.76G>C	p.Asp26His	missense	Exon 1 of 14	NP_004563.2	Q99959-1
	PKP2	NM_001407155.1		c.76G>C	p.Asp26His	missense	Exon 1 of 12	NP_001394084.1	A0A8V8TPU9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PKP2	ENST00000340811.9	TSL:1 MANE Select	c.76G>C	p.Asp26His	missense	Exon 1 of 13	ENSP00000342800.5	Q99959-2
	PKP2	ENST00000070846.11	TSL:1	c.76G>C	p.Asp26His	missense	Exon 1 of 14	ENSP00000070846.6	Q99959-1
	PKP2	ENST00000700559.2		c.76G>C	p.Asp26His	missense	Exon 1 of 12	ENSP00000515065.2	A0A8V8TPU9

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.09e-7 AC: 1 AN: 1410860 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 699506

African (AFR) AF: 0.00 AC: 0 AN: 32048

American (AMR) AF: 0.00 AC: 0 AN: 40080

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25362

East Asian (EAS) AF: 0.00 AC: 0 AN: 37474

South Asian (SAS) AF: 0.00 AC: 0 AN: 81290

European-Finnish (FIN) AF: 0.0000278 AC: 1 AN: 35930

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4128

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1095754

Other (OTH) AF: 0.00 AC: 0 AN: 58794

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.89
BayesDel_addAF	Uncertain	0.073	D
BayesDel_noAF	Benign	-0.13
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Benign	0.35	T
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.40
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.85	T
M_CAP	Pathogenic	0.93	D
MetaRNN	Uncertain	0.61	D
MetaSVM	Uncertain	0.24	D
MutationAssessor	Uncertain	2.2	M
PhyloP100		1.7
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-2.1	N
REVEL	Uncertain	0.56
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.011	D
Polyphen		1.0	D
Vest4		0.40
MutPred		0.54		Gain of loop (P = 0.0312)
MVP		0.92
MPC		0.71
ClinPred		0.98	D
GERP RS		4.1
PromoterAI		0.077	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.39
gMVP		0.64
Mutation Taster		=70/30	polymorphism

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

Other links and lift over

dbSNP: rs143004808; hg19: chr12-33049590;