Is ADAR p.Arg633Cys (c.1897C>T) pathogenic?

ADAR p.Arg633Cys (c.1897C>T) is classified Conflicting classifications of pathogenicity in ADAR (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2024-11-04). AlphaMissense: likely benign (0.1649); Very rare (popmax 0.00329%, sas); Associated with dyschromatosis symmetrica hereditaria.

What condition is associated with ADAR p.Arg633Cys (c.1897C>T)?

ADAR p.Arg633Cys (c.1897C>T) is associated with dyschromatosis symmetrica hereditaria, Aicardi-Goutieres syndrome 6 (ClinVar).

How common is ADAR p.Arg633Cys (c.1897C>T) in the general population?

ADAR p.Arg633Cys (c.1897C>T) is very rare (popmax 0.00329%, sas) (gnomAD).

How is Dyschromatosis symmetrica hereditaria inherited?

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

What do computational predictors say about ADAR p.Arg633Cys (c.1897C>T)?

AlphaMissense predicts likely benign (score 0.1649) — an in-silico prediction, not a clinical call.

ADAR p.Arg633Cys

c.1897C>T · rs1222149445 · VCV2924399

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.1649 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00329%, sas)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

dyschromatosis symmetrica hereditaria

Computational evidence

Protein change
AlphaMissense	0.1649	likely benign
REVEL	0.58	indeterminate
SaProt	LLR -9.06	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.8, phastCons 1
Regional constraint	o/e 0.74	unconstrained · MANE · 17 kb · p 1.3e-17 · regional, not allelic
Overall
CADD	33.0	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 0.00329% South Asian · 3/91,080 alleles

Filtering AF 0.000875% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000443%

Overall 0.000752% 11/1,461,876 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00329%	30,360
European (non-Finnish)	0.000678%	147,504

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.Arg633Cys
Coding: c.1897C>T
MANE Select: NM_001111
dbSNP: rs1222149445
Type: single nucleotide variant
Location: chr1:154597865 (GRCh38)
Gene constraint: LOEUF 0.449 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 68.86 · 24 PDB
Residue 633: the drbm 2 domain

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

Disease context

dyschromatosis symmetrica hereditaria — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Aicardi-Goutieres syndrome 6

For Dyschromatosis symmetrica hereditaria (Orphanet):

Inheritance: Autosomal dominant
Onset: Childhood

Similar variants

ADAR p.Arg633Gly Uncertain significance ★ ⚠ same residue
ADAR p.Arg633His 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
ADAR p.Arg474Ter 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-arg633cys (accessed [today's date]).

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