Is ADSL p.Pro318= (c.954G>A) pathogenic?

ADSL p.Pro318= (c.954G>A) is classified Likely benign in ADSL (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-10-21). Very rare (popmax 0.00322%, nfe); Associated with adenylosuccinate lyase deficiency.

What condition is associated with ADSL p.Pro318= (c.954G>A)?

ADSL p.Pro318= (c.954G>A) is associated with adenylosuccinate lyase deficiency (ClinVar).

How common is ADSL p.Pro318= (c.954G>A) in the general population?

ADSL p.Pro318= (c.954G>A) is very rare (popmax 0.00322%, nfe) (gnomAD).

How is Adenylosuccinate lyase deficiency inherited?

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

ADSL p.Pro318=

c.954G>A · rs774891125 · VCV2159766

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00322%, nfe)

Conditions

adenylosuccinate lyase deficiency

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 -9.3	GERP -5.2
Overall
CADD	0.756	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00322% European (non-Finnish) · 38/1,180,044 alleles

Filtering AF 0.00239% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0021%

Overall 0.00273% 44/1,614,028 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00322%	31,054
East Asian	0.00223%	44,898
South Asian	0.0022%	45,544
Remaining individualsnot grpmax-eligible	0.0016%	62,488
Finnishnot grpmax-eligible	0.00156%	63,986
African / African-American	0.00133%	74,918

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: ADSL
Protein: p.Pro318=
Coding: c.954G>A
MANE Select: NM_000026
dbSNP: rs774891125
Type: single nucleotide variant
Location: chr22:40361579 (GRCh38)
Gene constraint: LOEUF 0.915 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 96.82 · 4 PDB
Residue 318: a UniProt-annotated variant site (in adsld; severe); an α-helix

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

Disease context

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

For Adenylosuccinate lyase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy, Neonatal

Similar variants

ADSL p.Pro318Leu Pathogenic/Likely pathogenic ★★ same residue
ADSL c.1191+5G>C Pathogenic/Likely pathogenic ★★ same condition
ADSL c.402+1G>T Likely pathogenic ★★ same condition
ADSL c.482+1G>C Likely pathogenic ★★ same condition
ADSL c.-49T>C Pathogenic/Likely pathogenic ★★ same condition
ADSL p.Arg141Trp Pathogenic/Likely pathogenic ★★ same condition
ADSL p.Arg149Ter Pathogenic/Likely pathogenic ★★ same condition
ADSL p.Arg190Gln 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/adsl-p-pro318 (accessed [today's date]).

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