Is CPS1 p.Pro382= (c.1146G>A) pathogenic?

CPS1 p.Pro382= (c.1146G>A) is classified Likely benign in CPS1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-18). Very rare (popmax 0.00447%, eas); Associated with carbamoyl phosphate synthetase I deficiency disease.

What condition is associated with CPS1 p.Pro382= (c.1146G>A)?

CPS1 p.Pro382= (c.1146G>A) is associated with carbamoyl phosphate synthetase I deficiency disease (ClinVar).

How common is CPS1 p.Pro382= (c.1146G>A) in the general population?

CPS1 p.Pro382= (c.1146G>A) is very rare (popmax 0.00447%, eas) (gnomAD).

How is Carbamoyl-phosphate synthetase 1 deficiency inherited?

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

CPS1 p.Pro382=

c.1146G>A · rs773257710 · VCV1127872

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00447%, eas)

Conditions

carbamoyl phosphate synthetase I 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 -1.5	GERP -5.8
Overall
CADD	13.18	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00447% East Asian · 2/44,780 alleles

Filtering AF 0.00107% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000496%

Overall 0.00112% 18/1,611,906 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00447%	22,390
African / African-American	0.00401%	24,909
South Asian	0.0022%	45,512
European (non-Finnish)	0.000933%	107,157

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.Pro382=
Coding: c.1146G>A
MANE Select: NM_001875
dbSNP: rs773257710
Type: single nucleotide variant
Location: chr2:210592938 (GRCh38)
Gene constraint: LOEUF 0.764 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.80 · 14 PDB
Residue 382: a UniProt-annotated variant site (in cps1d); the glutamine amidotransferase type-1 domain; a β-strand

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.Pro382Leu Pathogenic/Likely pathogenic ★★ ⚠ 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-pro382 (accessed [today's date]).

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