raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:314978

X-linked non progressive cerebellar ataxia

Type
Disease
Group
Disorder
Inheritance
X-linked recessive
Age of onset
Infancy, Neonatal
Status
active

X-linked non progressive cerebellar ataxia is a rare hereditary ataxia characterized by delayed early motor development, severe neonatal hypotonia, non-progressive ataxia and slow eye movements, presenting normal cognitive abilities and absence of pyramidal signs. Frequently patients also manifest intention tremor, mild dysphagia, and dysarthria. Brain MRI reveals global cerebellar atrophy with absence of other malformations or degenerations of the central and peripheral nervous systems.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enX-linked non progressive cerebellar ataxia
frAtaxie cérébelleuse liée à l'X non progressive
deAtaxie, zerebelläre, nicht-progressive, X-chromosomale
esAtaxia cerebelosa no progresiva ligada al cromosoma X
itAtassia cerebellare non progressiva legata all'X
nlX-gebonden niet-progressieve cerebellaire ataxie
ptAtaxia cerebelosa não progressiva ligada ao X
plNiepostępująca ataksja móżdżkowa sprzężona z chromosomem XSCAX5 · Ataksja rdzeniowo-móżdżkowa typu 5 sprzężona z chromosomem X
csX-vázaná neprogresivní cerebelární ataxie
ukХ-зчеплена непрогресуюча мозочкова атаксія
zhX连锁非进行性小脑共济失调
trX'e bağlı ilerleyici olmayan serebellar ataksi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM300703NTBTvalidated
OMIM302500NTBTvalidated
ICD-10G11.0NTBTattributedvalidated
MONDO0010404Evalidated
UMLSC4707849Evalidated

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
ATP2B3Disease-causing germline mutation(s) inAssessedHGNC:816ENSG00000067842300014Xq28ATPase plasma membrane Ca2+ transporting 3
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families3 familiesWorldwideFamily(ies)Validated18241076[PMID]_22912398[PMID]
Point prevalence<1 / 1 000 000—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

16 annotations · validated 2018-05-09
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0002470Nonprogressive cerebellar ataxia
Frequent (79-30%)
HP:0002345Action tremor
HP:0001321Cerebellar hypoplasia
HP:0001320Cerebellar vermis hypoplasia
HP:0002312Clumsiness
HP:0002359Frequent falls
HP:0008935Generalized neonatal hypotonia
HP:0002080Intention tremor
HP:0001270Motor delay
HP:0001152Saccadic smooth pursuit
HP:0002464Spastic dysarthria
HP:0000486Strabismus
HP:0002078Truncal ataxia
HP:0002317Unsteady gait
Excluded (0%)
HP:0003487Babinski sign
HP:0001249Intellectual disability

Run the differential on the 1 obligate / very frequent terms

Annotation source: 22912398[PMID]_10797423[PMID]

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Sources for this card