Is CPS1 p.Val637Ala (c.1910T>C) pathogenic?

CPS1 p.Val637Ala (c.1910T>C) is classified Conflicting classifications of pathogenicity in CPS1 (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2024-06-23). AlphaMissense: likely pathogenic (0.95); Ultra-rare (popmax 0.0117%, amr); Associated with carbamoyl phosphate synthetase I deficiency disease.

What condition is associated with CPS1 p.Val637Ala (c.1910T>C)?

CPS1 p.Val637Ala (c.1910T>C) is associated with carbamoyl phosphate synthetase I deficiency disease, pulmonary hypertension, neonatal, susceptibility to (ClinVar).

How common is CPS1 p.Val637Ala (c.1910T>C) in the general population?

CPS1 p.Val637Ala (c.1910T>C) is ultra-rare (popmax 0.0117%, 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.Val637Ala (c.1910T>C)?

AlphaMissense predicts likely pathogenic (score 0.95) — an in-silico prediction, not a clinical call.

CPS1 p.Val637Ala

c.1910T>C · rs141562755 · VCV2051721

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.95 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0117%, amr)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

carbamoyl phosphate synthetase I deficiency disease

Computational evidence

Protein change
AlphaMissense	0.95	likely pathogenic
REVEL	0.972	strongly pathogenic-leaning
SaProt	LLR -10.58	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.9	GERP 2.9, phastCons 1
Regional constraint	o/e 0.93	unconstrained · MANE · 121 kb · p 0.0019 · regional, not allelic
Overall
CADD	26.5	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 0.0117% Admixed American · 7/59,810 alleles

Filtering AF 0.00545% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00381%

Overall 0.00335% 54/1,612,108 alleles · ultra-rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0117%	8,544
Remaining individualsnot grpmax-eligible	0.00802%	12,470
European (non-Finnish)	0.00356%	28,068

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.Val637Ala
Coding: c.1910T>C
MANE Select: NM_001875
dbSNP: rs141562755
Type: single nucleotide variant
Location: chr2:210605175 (GRCh38)
Gene constraint: LOEUF 0.764 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.80 · 14 PDB
Residue 637: the atp-grasp 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

Also linked: pulmonary hypertension, neonatal, susceptibility to

For Carbamoyl-phosphate synthetase 1 deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages

Similar variants

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
CPS1 c.1981+1G>C 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-val637ala (accessed [today's date]).

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