3-136250362-CCGGCACAGCAAAAATGGCGG-C

Position:

• chr3-136250362-CCGGCACAGCAAAAATGGCGG-C

Variant summary

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

The NM_000532.5(PCCB):​c.-8_12del variant causes a start lost, 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000147 in 1,357,372 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: PCCB NM_000532.5 start_lost, 5_prime_UTR
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.391

Genes affected

PCCB (HGNC:8654): (propionyl-CoA carboxylase subunit beta) The protein encoded by this gene is a subunit of the propionyl-CoA carboxylase (PCC) enzyme, which is involved in the catabolism of propionyl-CoA. PCC is a mitochondrial enzyme that probably acts as a dodecamer of six alpha subunits and six beta subunits. This gene encodes the beta subunit of PCC. Defects in this gene are a cause of propionic acidemia type II (PA-2). 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: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-136250362-CCGGCACAGCAAAAATGGCGG-C is Pathogenic according to our data. Variant chr3-136250362-CCGGCACAGCAAAAATGGCGG-C is described in ClinVar as [Pathogenic]. Clinvar id is 1069994.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PCCB	NM_000532.5	c.-8_12del		start_lost, 5_prime_UTR_variant	1/15	ENST00000251654.9
PCCB	NM_001178014.2	c.-8_12del		start_lost, 5_prime_UTR_variant	1/16
PCCB	XM_011512873.2	c.-8_12del		start_lost, 5_prime_UTR_variant	1/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PCCB	ENST00000251654.9	c.-8_12del		start_lost, 5_prime_UTR_variant	1/15	1	NM_000532.5	P2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000147 AC: 2 AN: 1357372 Hom.: 0 AF XY: 0.00000301 AC XY: 2 AN XY: 663802

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

Sep 13, 2022

For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Arg44 amino acid residue in PCCB. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 9683601, 12007220, 12757933). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. ClinVar contains an entry for this variant (Variation ID: 1069994). Disruption of the initiator codon has been observed in individual(s) with propionic acidemia (Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change affects the initiator methionine of the PCCB mRNA. The next in-frame methionine is located at codon 84. -

Computational scores

Source: dbNSFP v4.3

Splicing

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: chr3-135969204;