Is ADAR p.Cys630= (c.1890C>T) pathogenic?

ADAR p.Cys630= (c.1890C>T) is classified Likely benign in ADAR (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-02-01). Rare (popmax 0.225%, sas); Associated with dyschromatosis symmetrica hereditaria.

What condition is associated with ADAR p.Cys630= (c.1890C>T)?

ADAR p.Cys630= (c.1890C>T) is associated with dyschromatosis symmetrica hereditaria, Aicardi-Goutieres syndrome 6 (ClinVar).

How common is ADAR p.Cys630= (c.1890C>T) in the general population?

ADAR p.Cys630= (c.1890C>T) is rare (popmax 0.225%, sas) (gnomAD).

How is Dyschromatosis symmetrica hereditaria inherited?

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

ADAR p.Cys630=

c.1890C>T · rs558496566 · VCV540267

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

rare (popmax 0.225%, sas)

Conditions

dyschromatosis symmetrica hereditaria

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 0.88	GERP -1.6, phastCons 0.98
Overall
CADD	9.632	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.225% South Asian · 205/91,076 alleles

Filtering AF 0.2% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.19%

Overall 0.0136% 219/1,614,176 alleles · rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.225%	444
Middle Eastern	0.0165%	6,060
Remaining individualsnot grpmax-eligible	0.0096%	10,418
Admixed American	0.00167%	60,028
African / African-American	0.00133%	75,038
European (non-Finnish)	0.000424%	236,005

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.Cys630=
Coding: c.1890C>T
MANE Select: NM_001111
dbSNP: rs558496566
Type: single nucleotide variant
Location: chr1:154597872 (GRCh38)
Gene constraint: LOEUF 0.449 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 68.86 · 24 PDB
Residue 630: 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.Cys630Arg 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
ADAR p.Gln559Ter 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-cys630 (accessed [today's date]).

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