Is ASL p.Arg191Trp (c.571C>T) pathogenic?

ASL p.Arg191Trp (c.571C>T) is classified Conflicting classifications of pathogenicity in ASL (ClinVar, Conflicting submitters, 9 submitters; last evaluated 2026-02-02). AlphaMissense: likely benign (0.1301); Ultra-rare (popmax 0.0128%, nfe); Associated with argininosuccinic aciduria.

What condition is associated with ASL p.Arg191Trp (c.571C>T)?

ASL p.Arg191Trp (c.571C>T) is associated with argininosuccinic aciduria (ClinVar).

How common is ASL p.Arg191Trp (c.571C>T) in the general population?

ASL p.Arg191Trp (c.571C>T) is ultra-rare (popmax 0.0128%, nfe) (gnomAD).

How is Argininosuccinic aciduria inherited?

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

What do computational predictors say about ASL p.Arg191Trp (c.571C>T)?

AlphaMissense predicts likely benign (score 0.1301) — an in-silico prediction, not a clinical call.

ASL p.Arg191Trp

c.571C>T · rs143508372 · VCV445881

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 9 submitters

AlphaMissense

likely benign

0.1301 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0128%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

argininosuccinic aciduria

Computational evidence

Protein change
AlphaMissense	0.1301	likely benign
REVEL	0.9	moderately pathogenic-leaning
SaProt	LLR -7.58	tolerated
⇒ REVEL calls this damaging; AlphaMissense and SaProt do not.
Splicing
SpliceAI	Δ0.24	donor loss, 4 bp away · masked 0 · deltas
Constraint at this position
Conservation	phyloP 4.9	GERP 0.4, phastCons 1
Regional constraint	o/e 0.87	unconstrained · MANE · 17 kb · p 0.00078 · regional, not allelic
Overall
CADD	25.0	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 0.0128% European (non-Finnish) · 150/1,169,252 alleles

Filtering AF 0.0111% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0105%

Overall 0.0101% 161/1,590,800 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0128%	7,795
Remaining individualsnot grpmax-eligible	0.00649%	15,413
South Asian	0.00453%	22,087
Ashkenazi Jewishnot grpmax-eligible	0.00344%	29,082
Finnishnot grpmax-eligible	0.00163%	61,186
African / African-American	0.00134%	74,724

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: ASL
Protein: p.Arg191Trp
Coding: c.571C>T
MANE Select: NM_000048
dbSNP: rs143508372
Type: single nucleotide variant
Location: chr7:66086790 (GRCh38)
Gene constraint: LOEUF 0.937 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 96.51 · 2 PDB
Residue 191: a UniProt-annotated variant site (in arginsa); an α-helix

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

Disease context

argininosuccinic aciduria — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Argininosuccinic aciduria (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: 1-9 / 1 000 000 (United States)

Similar variants

ASL p.Arg191Gly Conflicting classifications of pathogenicity ★ ⚠ same residue
ASL p.Arg191= Likely benign ★ same residue
ASL c.1062+5G>C Likely pathogenic ★★ same condition
ASL c.1143+1G>T Pathogenic/Likely pathogenic ★★ same condition
ASL c.13-1G>C Pathogenic/Likely pathogenic ★★ same condition
ASL c.291+1G>T Likely pathogenic ★★ same condition
ASL c.348+1G>A Pathogenic/Likely pathogenic ★★ same condition
ASL c.349-1G>A 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/asl-p-arg191trp (accessed [today's date]).

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