Is ADAR p.Ala198Val (c.593C>T) pathogenic?

ADAR p.Ala198Val (c.593C>T) is classified Uncertain significance in ADAR (ClinVar, Single submitter, 1 submitter; last evaluated 2026-02-03). AlphaMissense: likely benign (0.1297); Ultra-rare (popmax 0.0286%, sas); Associated with Aicardi-Goutieres syndrome 6.

What condition is associated with ADAR p.Ala198Val (c.593C>T)?

ADAR p.Ala198Val (c.593C>T) is associated with Aicardi-Goutieres syndrome 6, dyschromatosis symmetrica hereditaria (ClinVar).

How common is ADAR p.Ala198Val (c.593C>T) in the general population?

ADAR p.Ala198Val (c.593C>T) is ultra-rare (popmax 0.0286%, sas) (gnomAD).

How is Aicardi-Goutières syndrome inherited?

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

What do computational predictors say about ADAR p.Ala198Val (c.593C>T)?

AlphaMissense predicts likely benign (score 0.1297) — an in-silico prediction, not a clinical call.

ADAR p.Ala198Val

c.593C>T · rs760911897 · VCV2062257

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1297 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0286%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Aicardi-Goutieres syndrome 6

Computational evidence

Protein change
AlphaMissense	0.1297	likely benign
REVEL	0.09	moderately benign-leaning
SaProt	LLR -6.99	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 0.33	GERP -0.94
Regional constraint	o/e 0.96	unconstrained · MANE · 6,556 bp · p 0.34 · regional, not allelic
Overall
CADD	7.741	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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 · 26/91,068 alleles

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

Overall 0.00266% 43/1,613,878 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0286%	3,503
Remaining individualsnot grpmax-eligible	0.0096%	10,414
Admixed American	0.00333%	29,997
European (non-Finnish)	0.000763%	131,101

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: ADAR
Protein: p.Ala198Val
Coding: c.593C>T
MANE Select: NM_001111
dbSNP: rs760911897
Type: single nucleotide variant
Location: chr1:154602049 (GRCh38)
Gene constraint: LOEUF 0.449 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 68.86 · 24 PDB
Residue 198: the z-binding 1 domain; the 'interaction with z-dna' region

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

Disease context

Aicardi-Goutieres syndrome 6 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: dyschromatosis symmetrica hereditaria

For Aicardi-Goutières syndrome (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: Antenatal, Infancy, Neonatal
Prevalence: 1-5 / 10 000 (Europe)

Similar variants

ADAR p.Ala198= Likely benign ★★ same residue
ADAR p.Ala198Glu Uncertain significance ★ ⚠ same residue
ADAR p.Ala198Thr Uncertain significance ★ ⚠ same residue
ADAR c.2885+1G>A Likely pathogenic ★★ same condition
ADAR p.Arg1078Cys Pathogenic ★★ same condition
ADAR p.Arg1096Ter Pathogenic/Likely pathogenic ★★ same condition
ADAR p.Arg328Ter Pathogenic ★★ same condition
ADAR p.Arg360Ter 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/adar-p-ala198val (accessed [today's date]).

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