Is CPS1 p.Asp52Gly (c.155A>G) pathogenic?

CPS1 p.Asp52Gly (c.155A>G) is classified Uncertain significance in CPS1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-09-27). AlphaMissense: likely benign (0.2521); Very rare (popmax 0.00834%, amr); Associated with carbamoyl phosphate synthetase I deficiency disease.

What condition is associated with CPS1 p.Asp52Gly (c.155A>G)?

CPS1 p.Asp52Gly (c.155A>G) is associated with carbamoyl phosphate synthetase I deficiency disease (ClinVar).

How common is CPS1 p.Asp52Gly (c.155A>G) in the general population?

CPS1 p.Asp52Gly (c.155A>G) is very rare (popmax 0.00834%, amr) (gnomAD).

How is Carbamoyl-phosphate synthetase 1 deficiency inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CPS1 p.Asp52Gly (c.155A>G)?

AlphaMissense predicts likely benign (score 0.2521) — an in-silico prediction, not a clinical call.

CPS1 p.Asp52Gly

c.155A>G · rs779756731 · VCV1422482

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2521 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00834%, amr)

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

carbamoyl phosphate synthetase I deficiency disease

Computational evidence

Protein change
AlphaMissense	0.2521	likely benign
REVEL	0.932	strongly pathogenic-leaning
SaProt	LLR -11.33	damaging
⇒ REVEL and SaProt call this damaging; AlphaMissense does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 2.7, phastCons 1
Regional constraint	o/e 0.93	unconstrained · MANE · 121 kb · p 0.0019 · regional, not allelic
Overall
CADD	29.0	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00834% Admixed American · 5/59,970 alleles

Filtering AF 0.00323% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00207%

Overall 0.000616% 9/1,460,982 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00834%	11,994
Remaining individualsnot grpmax-eligible	0.0016%	62,458
South Asian	0.0011%	91,070
European (non-Finnish)	0.00017%	589,623

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: CPS1
Protein: p.Asp52Gly
Coding: c.155A>G
MANE Select: NM_001875
dbSNP: rs779756731
Type: single nucleotide variant
Location: chr2:210573326 (GRCh38)
Gene constraint: LOEUF 0.764 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.80 · 14 PDB
Residue 52: the 'anthranilate phosphoribosyltransferase homolog' region

Full CPS1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

carbamoyl phosphate synthetase I deficiency disease — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Carbamoyl-phosphate synthetase 1 deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages

Similar variants

CPS1 p.Asp52Asn Conflicting classifications of pathogenicity ★ ⚠ same residue
CPS1 c.1086+1G>A Likely pathogenic ★★ same condition
CPS1 c.1087-1G>T Pathogenic/Likely pathogenic ★★ same condition
CPS1 c.1165-2A>G Likely pathogenic ★★ same condition
CPS1 c.1263+5G>C Pathogenic/Likely pathogenic ★★ same condition
CPS1 c.1549+1G>A Pathogenic/Likely pathogenic ★★ same condition
CPS1 c.1549+1G>T Pathogenic/Likely pathogenic ★★ same condition
CPS1 c.1837-8A>G 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/cps1-p-asp52gly (accessed [today's date]).

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