Is CPS1 p.Asn970Asp (c.2908A>G) pathogenic?

CPS1 p.Asn970Asp (c.2908A>G) is classified Likely benign in CPS1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-01-31). AlphaMissense: likely benign (0.0664); Ultra-rare (popmax 0.0286%, sas); Associated with carbamoyl phosphate synthetase I deficiency disease.

What condition is associated with CPS1 p.Asn970Asp (c.2908A>G)?

CPS1 p.Asn970Asp (c.2908A>G) is associated with carbamoyl phosphate synthetase I deficiency disease (ClinVar).

How common is CPS1 p.Asn970Asp (c.2908A>G) in the general population?

CPS1 p.Asn970Asp (c.2908A>G) is ultra-rare (popmax 0.0286%, sas) (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.Asn970Asp (c.2908A>G)?

AlphaMissense predicts likely benign (score 0.0664) — an in-silico prediction, not a clinical call.

CPS1 p.Asn970Asp

c.2908A>G · rs767885257 · VCV3014415

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0664 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0286%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

carbamoyl phosphate synthetase I deficiency disease

Computational evidence

Protein change
AlphaMissense	0.0664	likely benign
REVEL	0.28	benign-leaning
SaProt	LLR -5.21	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.1	GERP 0.38, phastCons 0.7
Regional constraint	o/e 0.93	unconstrained · MANE · 121 kb · p 0.0019 · regional, not allelic
Overall
CADD	12.02	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 0.0286% South Asian · 26/91,022 alleles

Filtering AF 0.0199% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0171%

Overall 0.00161% 26/1,610,890 alleles · ultra-rare

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.Asn970Asp
Coding: c.2908A>G
MANE Select: NM_001875
dbSNP: rs767885257
Type: single nucleotide variant
Location: chr2:210640008 (GRCh38)
Gene constraint: LOEUF 0.764 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.80 · 14 PDB

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.Asn970Ser 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-asn970asp (accessed [today's date]).

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