Is PC p.Ala281= (c.843C>T) pathogenic?

PC p.Ala281= (c.843C>T) is classified Likely benign in PC (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-01-16). Ultra-rare (popmax 0.0329%, mid); Associated with pyruvate carboxylase deficiency disease.

What condition is associated with PC p.Ala281= (c.843C>T)?

PC p.Ala281= (c.843C>T) is associated with pyruvate carboxylase deficiency disease (ClinVar).

How common is PC p.Ala281= (c.843C>T) in the general population?

PC p.Ala281= (c.843C>T) is ultra-rare (popmax 0.0329%, mid) (gnomAD).

How is Pyruvate carboxylase deficiency inherited?

Typically Autosomal recessive, Not applicable (Orphanet). A genetic counselor can assess individual risk for a family.

PC p.Ala281=

c.843C>T · rs150040684 · VCV716971

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0329%, mid)

Conditions

pyruvate carboxylase deficiency disease

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.8	GERP -1.2, phastCons 1
Overall
CADD	11.48	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0329% Middle Eastern · 2/6,080 alleles

Filtering AF 0.0155% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0128%

Overall 0.00793% 128/1,613,552 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0329%	3,040
African / African-American	0.024%	4,163
Remaining individualsnot grpmax-eligible	0.016%	6,248
European (non-Finnish)	0.00805%	12,421
Admixed American	0.005%	20,004

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: PC
Protein: p.Ala281=
Coding: c.843C>T
MANE Select: NM_001040716
dbSNP: rs150040684
Type: single nucleotide variant
Location: chr11:66870362 (GRCh38)
Gene constraint: LOEUF 0.539 · pLI 0.07 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 90.53 · 10 PDB
Residue 281: the biotin carboxylation domain; the atp-grasp domain

Full PC gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

pyruvate carboxylase deficiency disease — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Pyruvate carboxylase deficiency (Orphanet):

Inheritance: Autosomal recessive, Not applicable
Onset: Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

PC p.Ala281Thr Uncertain significance ★★ ⚠ same residue
PC c.1368+1G>A Likely pathogenic ★★ same condition
PC c.1826-1G>C Likely pathogenic ★★ same condition
PC c.1983-116C>T Likely pathogenic ★★ same condition
PC c.633+2T>C Likely pathogenic ★★ same condition
PC p.Ala610Thr Pathogenic ★★ same condition
PC p.Ala812Asp Likely pathogenic ★★ same condition
PC p.Arg18Ter Pathogenic/Likely pathogenic ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/pc-p-ala281 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown