Is TH p.Glu223= (c.669G>A) pathogenic?

TH p.Glu223= (c.669G>A) is classified Likely benign in TH (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-02). No allele count reported in gnomAD v4.1 (AN 1,564,506); Associated with TH-deficient dopa-responsive dystonia.

What condition is associated with TH p.Glu223= (c.669G>A)?

TH p.Glu223= (c.669G>A) is associated with TH-deficient dopa-responsive dystonia (ClinVar).

How common is TH p.Glu223= (c.669G>A) in the general population?

TH p.Glu223= (c.669G>A) is no allele count reported in gnomAD v4.1 (AN 1,564,506) (gnomAD).

How is Autosomal recessive dopa-responsive dystonia inherited?

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

TH p.Glu223=

c.669G>A · rs2133694789 · VCV1081586

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,564,506)

Conditions

TH-deficient dopa-responsive dystonia

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.08	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.1	GERP 0.063, phastCons 0.95
Overall
CADD	8.399	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,564,506). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: TH
Protein: p.Glu223=
Coding: c.669G>A
MANE Select: NM_000360
dbSNP: rs2133694789
Type: single nucleotide variant
Location: chr11:2167461 (GRCh38)
Gene constraint: LOEUF 1.27 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.75 · 7 PDB
Residue 223: a turn

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

Disease context

TH-deficient dopa-responsive dystonia — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal recessive dopa-responsive dystonia (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

TH c.1200+2T>C Likely pathogenic ★★ same condition
TH c.1334+1G>A Likely pathogenic ★★ same condition
TH c.312+1G>A Likely pathogenic ★★ same condition
TH c.488-1G>A Pathogenic ★★ same condition
TH c.644+1G>A Likely pathogenic ★★ same condition
TH c.695+1G>C Likely pathogenic ★★ same condition
TH c.90+10C>T Pathogenic/Likely pathogenic ★★ same condition
TH c.90+13G>A 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/th-p-glu223 (accessed [today's date]).

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