NM_000282.4:c.878A>G

Variant names:

• chr13-100268747-A-G
• rs879253805
• NM_000282.4:c.878A>G

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1 PM2 PM5 PP3_Strong PP5

The NM_000282.4(PCCA):​c.878A>G​(p.Gln293Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000547 in 1,461,748 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q293E) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: PCCA NM_000282.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:4 U:1
• Conservation: PhyloP100: 9.31
• Publications: 1 publications found

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]

PCCA Gene-Disease associations (from GenCC):

• propionic acidemia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Myriad Women’s Health, Orphanet, Labcorp Genetics (formerly Invitae), ClinGen, G2P

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 uncertain in NM_000282.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr13-100268746-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 2137535.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant 13-100268747-A-G is Pathogenic according to our data. Variant chr13-100268747-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 218252.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000282.4. 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
	PCCA	NM_000282.4	MANE Select	c.878A>G	p.Gln293Arg	missense	Exon 11 of 24	NP_000273.2	P05165-1
	PCCA	NM_001352605.2		c.878A>G	p.Gln293Arg	missense	Exon 11 of 23	NP_001339534.1
	PCCA	NM_001127692.3		c.800A>G	p.Gln267Arg	missense	Exon 10 of 23	NP_001121164.1	P05165-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PCCA	ENST00000376285.6	TSL:1 MANE Select	c.878A>G	p.Gln293Arg	missense	Exon 11 of 24	ENSP00000365462.1	P05165-1
	PCCA	ENST00000881637.1		c.1001A>G	p.Gln334Arg	missense	Exon 12 of 25	ENSP00000551696.1
	PCCA	ENST00000881640.1		c.983A>G	p.Gln328Arg	missense	Exon 12 of 25	ENSP00000551699.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461748 Hom.: 0 Cov.: 30 AF XY: 0.00000688 AC XY: 5 AN XY: 727188

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.0000812 AC: 7 AN: 86252

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111882

Other (OTH) AF: 0.0000166 AC: 1 AN: 60390

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
4	-	-	Propionic acidemia (4)
-	1	-	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.66	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	5.0	H
PhyloP100		9.3
PrimateAI	Uncertain	0.74	T
PROVEAN	Uncertain	-3.7	D
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.91
MutPred		0.93		Gain of MoRF binding (P = 0.0221)
MVP		0.99
MPC		0.64
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.97
gMVP		0.96
Mutation Taster		=3/97	disease causing (ClinVar)

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: rs879253805; hg19: chr13-100921001;