Is ADSL p.His217Asp (c.649C>G) pathogenic?

ADSL p.His217Asp (c.649C>G) is classified Benign/Likely benign in ADSL (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-02-02). AlphaMissense: likely benign (0.0789); Rare (popmax 0.467%, amr); Associated with adenylosuccinate lyase deficiency.

What condition is associated with ADSL p.His217Asp (c.649C>G)?

ADSL p.His217Asp (c.649C>G) is associated with adenylosuccinate lyase deficiency (ClinVar).

How common is ADSL p.His217Asp (c.649C>G) in the general population?

ADSL p.His217Asp (c.649C>G) is rare (popmax 0.467%, amr) (gnomAD).

How is Adenylosuccinate lyase deficiency inherited?

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

What do computational predictors say about ADSL p.His217Asp (c.649C>G)?

AlphaMissense predicts likely benign (score 0.0789) — an in-silico prediction, not a clinical call.

ADSL p.His217Asp

c.649C>G · rs199761158 · VCV197619

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

AlphaMissense

likely benign

0.0789 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.467%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

adenylosuccinate lyase deficiency

Computational evidence

Protein change
AlphaMissense	0.0789	likely benign
REVEL	0.127	moderately benign-leaning
SaProt	LLR 1.01	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 1.5	GERP -1.4, phastCons 0.97
Regional constraint	o/e 0.79	unconstrained · MANE · 20 kb · p 5.6e-07 · regional, not allelic
Overall
CADD	13.09	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 0.467% Admixed American · 280/59,996 alleles

Filtering AF 0.422% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.404%

Overall 0.0178% 288/1,614,040 alleles · rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.467%	214
Remaining individualsnot grpmax-eligible	0.0048%	20,833
African / African-American	0.004%	25,005
South Asian	0.0011%	91,056
European (non-Finnish)	8.47e-05%	1,180,016

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.His217Asp
Coding: c.649C>G
MANE Select: NM_000026
dbSNP: rs199761158
Type: single nucleotide variant
Location: chr22:40359030 (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 217: 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.His217Tyr Uncertain significance ★ ⚠ 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-his217asp (accessed [today's date]).

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