chr3-136250377-TG-AA

Position:

• chr3-136250377-TG-AA

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1 PS1_Moderate PM2 PP5_Moderate

The NM_000532.5(PCCB):​c.2_3delinsAA​(p.Met1?) variant causes a start lost change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: PCCB NM_000532.5 start_lost
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.89

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 14 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PS1: Another start lost variant in NM_000532.5 (PCCB) was described as [Pathogenic] in ClinVar as 93230
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-136250377-TG-AA is Pathogenic according to our data. Variant chr3-136250377-TG-AA is described in ClinVar as [Pathogenic]. Clinvar id is 1968405.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.2_3delinsAA	p.Met1?	start_lost	1/15	ENST00000251654.9
PCCB	NM_001178014.2	c.2_3delinsAA	p.Met1?	start_lost	1/16
PCCB	XM_011512873.2	c.2_3delinsAA	p.Met1?	start_lost	1/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PCCB	ENST00000251654.9	c.2_3delinsAA	p.Met1?	start_lost	1/15	1	NM_000532.5	P2

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

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 15, 2023

This sequence change affects the initiator methionine of the PCCB mRNA. The next in-frame methionine is located at codon 84. Information on the frequency of this variant in the gnomAD database is not available, as this variant may be reported differently in the database. This variant has not been reported in the literature in individuals affected with PCCB-related conditions. ClinVar contains an entry for this variant (Variation ID: 1968405). This variant disrupts a region of the PCCB protein in which other variant(s) (p.His59Gln) have been determined to be pathogenic (Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

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: chr3-135969219;