raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:306734

Primary dystonia, DYT21 type

Synonyms: DYT21

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Adult
Status
active

Primary dystonia, DYT21 type is a subtype of mixed dystonia with a late-onset form of pure torsion dystonia.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPrimary dystonia, DYT21 typeDYT21
frDystonie primaire type DYT21= en
deDystonie, primäre, Typ DYT21= en
esDistonía primaria tipo DYT21
itDistonia primitiva, tipo DYT21= en
nlPrimaire dystonie, DYT21-type= en
ptDistonia primária, tipo DYT21
plDystonia pierwotna, typ DYT21= en
csPrimární dystonie, typ DYT21= en
ukПервинна дистонія, тип DYT21= en
zh原发性肌张力障碍DYT21型DYT21型
trPrimer distoni, DYT21 tipi= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM614588Evalidated
ICD-10G24.1NTBTattributedvalidated
MONDO0013813Evalidated
UMLSC3281236Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
DYT21Disease-causing germline mutation(s) inAssessedHGNC:394362q14.3-q21.3dystonia 21, torsion (autosomal dominant)21301909[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families16 casesWorldwideCase(s)Validated21301909[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_21301909[PMID]

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

9 annotations · validated 2018-04-09
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001332Dystonia
Frequent (79-30%)
HP:0000643Blepharospasm
HP:0004373Focal dystonia
HP:0007325Generalized dystonia
HP:0002268Paroxysmal dystonia
HP:0000473Torticollis
Occasional (29-5%)
HP:0002530Axial dystonia
HP:0012049Laryngeal dystonia
HP:0002451Limb dystonia

Run the differential on the 1 obligate / very frequent terms

Annotation source: 21301909[PMID]_3400518[PMID]

7

Sources for this card