chr13-100089133-TG-T

Position:

• chr13-100089133-TG-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000282.4(PCCA):​c.16del​(p.Val6SerfsTer20) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000148 in 1,355,006 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000015 (0 hom.)
• Consequence: PCCA NM_000282.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.39

Genes affected

PCCA (HGNC:8653): (propionyl-CoA carboxylase subunit alpha) The protein encoded by this gene is the alpha subunit of the heterodimeric mitochondrial enzyme Propionyl-CoA carboxylase. PCCA encodes the biotin-binding region of this enzyme. Mutations in either PCCA or PCCB (encoding the beta subunit) lead to an enzyme deficiency resulting in propionic acidemia. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, May 2010]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 147 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 13-100089133-TG-T is Pathogenic according to our data. Variant chr13-100089133-TG-T is described in ClinVar as [Pathogenic]. Clinvar id is 2963907.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PCCA	NM_000282.4	c.16del	p.Val6SerfsTer20	frameshift_variant	1/24	ENST00000376285.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PCCA	ENST00000376285.6	c.16del	p.Val6SerfsTer20	frameshift_variant	1/24	1	NM_000282.4	P1
PCCA	ENST00000376286.8	c.16del	p.Val6SerfsTer20	frameshift_variant	1/23	2
PCCA	ENST00000376279.7	c.16del	p.Val6SerfsTer20	frameshift_variant	1/23	2
PCCA	ENST00000647303.1	c.16del	p.Val6SerfsTer20	frameshift_variant, NMD_transcript_variant	1/21

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000148 AC: 2 AN: 1355006 Hom.: 0 Cov.: 31 AF XY: 0.00000150 AC XY: 1 AN XY: 665472

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: 0.00000189

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Propionic acidemia Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 25, 2023

This sequence change creates a premature translational stop signal (p.Val6Serfs*20) in the PCCA gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PCCA are known to be pathogenic (PMID: 15464417). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with PCCA-related conditions. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr13-100741387;