raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:217012

Spinocerebellar ataxia type 31

Synonyms: SCA31

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Adolescent, Adult, Childhood, Elderly
Status
active

An autosomal dominant cerebellar ataxia type III that is characterized by the late-onset of ataxia, dysarthria and horizontal gaze nystagmus, and that is occasionally accompanied by pyramidal signs, tremor, decreased vibration sense and hearing difficulties.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enSpinocerebellar ataxia type 31SCA31
frAtaxie spinocérébelleuse type 31= en
deAtaxie, spinozerebelläre, Typ 31= en
esAtaxia espinocerebelosa tipo 31= en
itAtassia spinocerebellare tipo 31= en
nlSpinocerebellaire ataxie type 31= en
ptAtaxia espinocerebelosa tipo 31= en
plAtaksja rdzeniowo-móżdżkowa typu 31= en
csSpinocerebelární ataxie, typ 31= en
ukСпіноцеребеллярна атаксія, тип 31= en
zh脊髓小脑共济失调31型= en
trSpinoserebellar ataksi tip 31= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM117210Evalidated
ICD-10G11.8NTBTattributedvalidated
ICD-118A03.16NTBTindexvalidated
MONDO0007296Evalidated
MeSHC566146Evalidated
UMLSC1861736Evalidated
GARD9975Evalidated

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
BEAN1Disease-causing germline mutation(s) inAssessedHGNC:24160ENSG0000016654661205116q21brain expressed associated with NEDD4 117611710[PMID]_19878914[PMID]_22992774[PMID]_20301317[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families30 familiesWorldwideFamily(ies)Validated22353852[PMID]_24344778[PMID]
Point prevalenceUnknown—WorldwideClass onlyValidatedORPHANET

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

11 annotations · validated 2018-04-27
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001272Cerebellar atrophy
HP:0001260Dysarthria
HP:0002066Gait ataxia
Frequent (79-30%)
HP:0001265Hyporeflexia
HP:0000639Nystagmus
Occasional (29-5%)
HP:0000365Hearing impairment
HP:0006801Hyperactive deep tendon reflexes
HP:0001347Hyperreflexia
HP:0002495Impaired vibratory sensation
HP:0001257Spasticity
HP:0001337Tremor

Run the differential on the 3 obligate / very frequent terms

Annotation source: 16780885[PMID]

7

Sources for this card