chr12-32877908-C-G

Variant names:

• chr12-32877908-C-G
• rs142636176
• NM_001005242.3:c.972G>C

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_001005242.3(PKP2):​c.972G>C​(p.Ala324Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. A324A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PKP2 NM_001005242.3 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.0810
• 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

ENSG00000309501 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.52).
• BP6: Variant 12-32877908-C-G is Benign according to our data. Variant chr12-32877908-C-G is described in ClinVar as Likely_benign. ClinVar VariationId is 1531343.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-0.081 with no splicing effect.

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.972G>C	p.Ala324Ala	synonymous	Exon 3 of 13	NP_001005242.2	Q99959-2
	PKP2	NM_004572.4		c.972G>C	p.Ala324Ala	synonymous	Exon 3 of 14	NP_004563.2	Q99959-1
	PKP2	NM_001407155.1		c.972G>C	p.Ala324Ala	synonymous	Exon 3 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.972G>C	p.Ala324Ala	synonymous	Exon 3 of 13	ENSP00000342800.5	Q99959-2
	PKP2	ENST00000070846.11	TSL:1	c.972G>C	p.Ala324Ala	synonymous	Exon 3 of 14	ENSP00000070846.6	Q99959-1
	PKP2	ENST00000700559.2		c.972G>C	p.Ala324Ala	synonymous	Exon 3 of 12	ENSP00000515065.2	A0A8V8TPU9

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Arrhythmogenic right ventricular dysplasia 9 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.52
CADD	Benign	1.2
DANN	Benign	0.56
PhyloP100		-0.081

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: rs142636176; hg19: chr12-33030842;