raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:276244

Machado-Joseph disease type 3

Synonyms: SCA3, Machado type · Spinocerebellar ataxia type 3, Machado type

Type
Clinical subtype
Group
Subtype of disorder
Inheritance
Autosomal dominant
Age of onset
Adult
Status
active

Machado-Joseph disease type 3 is a subtype of Machado-Joseph disease (SCA3/MJD) of milder severity characterized by late onset, slower progression, and peripheral amyotrophy.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMachado-Joseph disease type 3SCA3, Machado type · Spinocerebellar ataxia type 3, Machado type
frMaladie de Machado-Joseph type 3Ataxie spinocérébelleuse type 3, type Machado · SCA3 type Machado
deMachado-Joseph-Krankheit Typ 3Ataxie, spinozerebelläre, Typ 3, vom Machado Typ · SCA3, Typ Machado
esEnfermedad de Machado-Joseph tipo 3Ataxia espinocerebelosa tipo 3, tipo Machado · SCA3 tipo Machado
itMalattia di Machado-Joseph, tipo 3Atassia spinocerebellare tipo 3, tipo Machado · SCA3, tipo Machado
nlZiekte van Machado-Joseph type 3SCA3, Machado-type · Spinocerebellaire ataxie type 3, Machado-type
ptDoença de Machado–Joseph, tipo 3
plChoroba Machado i Josepha typu 3Ataksja rdzeniowo-móżdżkowa typu 3, typ Machado · SCA3, typ Machado
csMachado-Josephova nemoc, typ 3SCA3, typ Machado · Spinocerebelární ataxie, typ 3, typ Machado
ukХвороба Мачадо-Жозефа, тип 3SCA3, тип Мачадо · Спіноцеребеллярна атаксія 3 типу, тип Мачадо
zhMachado-Joseph病3型Machado型脊髓小脑共济失调3型
trMachado-Joseph hastalığı tip 3SCA3, Machado tipi · Spinoserebellar ataksi tip 3, Machado tipi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM109150NTBTvalidated
ICD-10G11.8NTBTattributedvalidated
ICD-118A03.16NTBTindexvalidated
MONDO0017176Evalidated
UMLSC0751670Evalidated

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
ATXN3Disease-causing germline mutation(s) inAssessedHGNC:7106ENSG0000006642760704714q32.12ataxin 3
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot yet validated23994570[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

38 annotations · validated 2017-04-26
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0002071Abnormality of extrapyramidal motor functionDiagnostic criterion
HP:0008944Distal lower limb amyotrophyDiagnostic criterion
HP:0002073Progressive cerebellar ataxiaDiagnostic criterion
HP:0000590Progressive external ophthalmoplegiaDiagnostic criterion
Frequent (79-30%)
HP:0002366Abnormal lower motor neuron morphology
HP:0007256Abnormal pyramidal sign
HP:0003487Babinski sign
HP:0001272Cerebellar atrophy
HP:0002312Clumsiness
HP:0002398Degeneration of anterior horn cells
HP:0040140Degeneration of the striatum
HP:0000750Delayed speech and language development
HP:0002198Dilated fourth ventricle
HP:0000651Diplopia
HP:0002460Distal muscle weakness
HP:0001260Dysarthria
HP:0001332Dystonia
HP:0003457EMG abnormality
HP:0007089Facial-lingual fasciculations
HP:0000640Gaze-evoked nystagmus
HP:0001347Hyperreflexia
HP:0007240Progressive gait ataxia
HP:0000520Proptosis
HP:0003202Skeletal muscle atrophy
HP:0001257Spasticity
HP:0002503Spinocerebellar tract degeneration
HP:0011960Substantia nigra gliosis
HP:0000623Supranuclear ophthalmoplegia
HP:0002493Upper motor neuron dysfunction
Occasional (29-5%)
HP:0001751Abnormal vestibular function
HP:0004370Abnormality of temperature regulation
HP:0002015Dysphagia
HP:0002354Memory impairment
HP:0003394Muscle spasm
HP:0000011Neurogenic bladder
HP:0003477Peripheral axonal neuropathy
HP:0002360Sleep abnormality
HP:0001605Vocal cord paralysis

Run the differential on the 4 obligate / very frequent terms

Annotation source: 21635785[PMID]_15178224[PMID]_20301375[PMID]_945867[PMID]_14967775[PMID]

7

Sources for this card