rs202049874

Positions:

• chr13-100111903-C-T

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS2

The NM_000282.4(PCCA):​c.231+15C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00272 in 1,606,098 control chromosomes in the GnomAD database, including 21 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0028 (2 hom., cov: 32)
  • Exomes 𝑓: 0.0027 (19 hom.)
• Consequence: PCCA NM_000282.4 intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:3
• Conservation: PhyloP100: 0.224

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 Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BP6: Variant 13-100111903-C-T is Benign according to our data. Variant chr13-100111903-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 310842.We mark this variant Likely_benign, oryginal submissions are: {Benign=2, Uncertain_significance=2, Likely_benign=1}.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PCCA	NM_000282.4	c.231+15C>T		intron_variant		ENST00000376285.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PCCA	ENST00000376285.6	c.231+15C>T		intron_variant		1	NM_000282.4	P1

Frequencies

GnomAD3 genomes AF: 0.00275 AC: 418 AN: 151802 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.000339

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000723

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000209

Gnomad FIN AF: 0.0208

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00244

Gnomad OTH AF: 0.00287

GnomAD3 exomes AF: 0.00310 AC: 776 AN: 250160 Hom.: 6 AF XY: 0.00299 AC XY: 405 AN XY: 135350

Gnomad AFR exome AF: 0.000186

Gnomad AMR exome AF: 0.000261

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000229

Gnomad FIN exome AF: 0.0212

Gnomad NFE exome AF: 0.00254

Gnomad OTH exome AF: 0.00197

GnomAD4 exome AF: 0.00271 AC: 3946 AN: 1454180 Hom.: 19 Cov.: 29 AF XY: 0.00266 AC XY: 1922 AN XY: 723856

Gnomad4 AFR exome AF: 0.000390

Gnomad4 AMR exome AF: 0.000448

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000506

Gnomad4 SAS exome AF: 0.000256

Gnomad4 FIN exome AF: 0.0221

Gnomad4 NFE exome AF: 0.00234

Gnomad4 OTH exome AF: 0.00213

GnomAD4 genome AF: 0.00275 AC: 418 AN: 151918 Hom.: 2 Cov.: 32 AF XY: 0.00352 AC XY: 261 AN XY: 74250

Gnomad4 AFR AF: 0.000338

Gnomad4 AMR AF: 0.000722

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000209

Gnomad4 FIN AF: 0.0208

Gnomad4 NFE AF: 0.00244

Gnomad4 OTH AF: 0.00284

Alfa AF: 0.00255 Hom.: 0

Bravo AF: 0.00112

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Uncertain:1 Benign:1

Benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 16, 2018	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Nov 16, 2020	Variant summary: PCCA c.231+15C>T alters a non-conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. 4/4 computational tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.0031 in 250160 control chromosomes in the gnomAD database, including 6 homozygotes. This frequency is somewhat close to the estimated maximal expected allele frequency for a pathogenic PCCA variant causing Propionic Acidemia (0.0031 vs 0.0034), suggesting this variant might represent a benign polymorphism. To our knowledge, no occurrence of c.231+15C>T in individuals affected with Propionic Acidemia and no experimental evidence demonstrating its impact on protein function have been reported. Three ClinVar submitters (evaluation after 2014) cite the variant as benign/likely benign (n=2) or uncertain significance (n=1). Based on the evidence outlined above, the variant was classified as VUS-possibly benign. -

Propionic acidemia Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Benign, criteria provided, single submitter	clinical testing	Invitae	Feb 01, 2024	- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

May 11, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	4.1
DANN	Benign	0.57

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

LitVar

Other links and lift over

dbSNP: rs202049874; hg19: chr13-100764157;