chr4-105369752-C-T

Variant names:

• chr4-105369752-C-T
• rs1732949078
• NM_176869.3:c.978G>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Moderate BP6_Moderate BP7

The NM_176869.3(PPA2):​c.978G>A​(p.Glu326Glu) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000197 in 152,038 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: PPA2 NM_176869.3 splice_region, synonymous
• Scores: Splicing: ADA: 0.00004553
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -1.08
• Publications: 0 publications found

Genes affected

PPA2 (HGNC:28883): (inorganic pyrophosphatase 2) The protein encoded by this gene is localized to the mitochondrion, is highly similar to members of the inorganic pyrophosphatase (PPase) family, and contains the signature sequence essential for the catalytic activity of PPase. PPases catalyze the hydrolysis of pyrophosphate to inorganic phosphate, which is important for the phosphate metabolism of cells. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. [provided by RefSeq, Jul 2008]

PPA2 Gene-Disease associations (from GenCC):

• sudden cardiac failure, infantile

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy

  Inheritance: AR Classification: STRONG Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (REVEL=0.073).
• BP6: Variant 4-105369752-C-T is Benign according to our data. Variant chr4-105369752-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 2102229.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-1.08 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_176869.3. 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
	PPA2	NM_176869.3	MANE Select	c.978G>A	p.Glu326Glu	splice_region synonymous	Exon 12 of 12	NP_789845.1	Q9H2U2-1
	PPA2	NM_006903.4		c.891G>A	p.Glu297Glu	splice_region synonymous	Exon 11 of 11	NP_008834.3	Q9H2U2-3
	PPA2	NM_176866.2		c.672G>A	p.Glu224Glu	splice_region synonymous	Exon 8 of 8	NP_789842.2	Q9H2U2-6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PPA2	ENST00000341695.10	TSL:1 MANE Select	c.978G>A	p.Glu326Glu	splice_region synonymous	Exon 12 of 12	ENSP00000343885.5	Q9H2U2-1
	PPA2	ENST00000348706.9	TSL:1	c.891G>A	p.Glu297Glu	splice_region synonymous	Exon 11 of 11	ENSP00000313061.8	Q9H2U2-3
	PPA2	ENST00000432483.6	TSL:1	c.672G>A	p.Glu224Glu	splice_region synonymous	Exon 8 of 8	ENSP00000389957.2	Q9H2U2-6

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152038 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1435980 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 715682

African (AFR) AF: 0.00 AC: 0 AN: 32826

American (AMR) AF: 0.00 AC: 0 AN: 44686

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25986

East Asian (EAS) AF: 0.00 AC: 0 AN: 39560

South Asian (SAS) AF: 0.00 AC: 0 AN: 85698

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53370

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5720

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1088508

Other (OTH) AF: 0.00 AC: 0 AN: 59626

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152038 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74258

African (AFR) AF: 0.0000483 AC: 2 AN: 41388

American (AMR) AF: 0.00 AC: 0 AN: 15262

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.000193 AC: 1 AN: 5182

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10572

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68016

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	4.3
DANN	Benign	0.18
PhyloP100		-1.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000046
dbscSNV1_RF	Benign	0.040
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: rs1732949078; hg19: chr4-106290909;