Is DRD2 p.Ala420= (c.1260C>T) pathogenic?

DRD2 p.Ala420= (c.1260C>T) is classified Likely benign in DRD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2018-11-12). Ultra-rare (popmax 0.0341%, sas); Associated with dystonic disorder.

What condition is associated with DRD2 p.Ala420= (c.1260C>T)?

DRD2 p.Ala420= (c.1260C>T) is associated with dystonic disorder (ClinVar).

How common is DRD2 p.Ala420= (c.1260C>T) in the general population?

DRD2 p.Ala420= (c.1260C>T) is ultra-rare (popmax 0.0341%, sas) (gnomAD).

DRD2 p.Ala420=

c.1260C>T · rs200440686 · VCV724823

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0341%, sas)

Conditions

dystonic disorder

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 -0.84	GERP -2
Overall
CADD	10.17	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0341% South Asian · 31/90,966 alleles

Filtering AF 0.0247% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0214%

Overall 0.00589% 95/1,612,576 alleles · ultra-rare exomes 91/1,461,886 · genomes 4/150,690 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0341%	2,934
Remaining individualsnot grpmax-eligible	0.0048%	20,823
European (non-Finnish)	0.00475%	21,062
Finnishnot grpmax-eligible	0.00313%	31,993
African / African-American	0.00269%	37,197
Admixed American	0.00167%	59,902

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: DRD2
Protein: p.Ala420=
Coding: c.1260C>T
MANE Select: NM_000795
dbSNP: rs200440686
Type: single nucleotide variant
Location: chr11:113410799 (GRCh38)
Gene constraint: LOEUF 0.372 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 72.49 · 11 PDB
Residue 420: an α-helix

Full DRD2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

dystonic disorder — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

DRD2 p.Arg274Gln Uncertain significance ★★ ⚠ same condition
DRD2 p.Gln366Lys Uncertain significance ★★ ⚠ same condition
DRD2 p.Glu99Lys Uncertain significance ★★ ⚠ same condition
DRD2 p.Gly261Arg Uncertain significance ★★ ⚠ same condition
DRD2 p.His316Pro Uncertain significance ★★ ⚠ same condition
DRD2 p.Ile431Thr Uncertain significance ★★ ⚠ same condition
DRD2 p.Pro300His Uncertain significance ★★ ⚠ same condition
DRD2 c.1139-653A>C Benign ★★ 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/drd2-p-ala420 (accessed [today's date]).

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