raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:589522

Spinocerebellar ataxia type 46

Synonyms: SCA46

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

A rare autosomal dominant cerebellar ataxia characterized by slowly progressive late-onset cerebellar ataxia, variably combined with sensory axonal neuropathy. Patients may present gait and limb ataxia, dysarthria, abnormal oculomotor function, and distal sensory impairment. Cerebellar atrophy is typically mild or absent.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enSpinocerebellar ataxia type 46SCA46
frAtaxie spinocérébelleuse type 46= en
deAtaxie, spinozerebelläre, Typ 46= en
esAtaxia espinocerebelosa tipo 46= en
itAtassia spinocerebellare tipo 46= en
nlSpinocerebellaire ataxie type 46= en
ptAtaxia espinocerebelosa tipo 46= en
plAtaksja rdzeniowo-móżdżkowa typ 46SCA typ 46
csSpinocerebelární ataxie typu 46= en
ukСпіноцеребеллярна атаксія, тип 46= en
zhSpinocerebellar ataxia type 46= en
trSpinocerebellar ataxia type 46= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM617770Evalidated
ICD-10G11.8NTBTattributedvalidated
ICD-118A03.16NTBTattributedvalidated
MONDO0033481Evalidated
UMLSC4540404Evalidated

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 (2):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
PLD3Disease-causing germline mutation(s) inAssessedHGNC:17158ENSG0000010522361569819q13.2phospholipase D family member 329847346[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families1 familiesWorldwideFamily(ies)Validated8595484[PMID]_29847346[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated8595484[PMID]_29847346[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

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card