raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:1171

Cerebellar ataxia-areflexia-pes cavus-optic atrophy-sensorineural hearing loss syndrome

Synonyms: CAPOS syndrome · Cerebellar ataxia-areflexia-pes cavus-optic atrophy-sensorineural deafness syndrome

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant, Mitochondrial inheritance
Age of onset
Infancy, Neonatal
Status
active

A rare autosomal dominant neurological disorder characterized by early onset cerebellar ataxia, associated with areflexia, progressive optic atrophy, sensorineural deafness, a pes cavus deformity, and abnormal eye movements.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enCerebellar ataxia-areflexia-pes cavus-optic atrophy-sensorineural hearing loss syndromeCAPOS syndrome · Cerebellar ataxia-areflexia-pes cavus-optic atrophy-sensorineural deafness syndrome
frSyndrome d'ataxie cérébelleuse-aréflexie-pieds creux-atrophie optique-surdité neurosensorielleSyndrome CAPOS
deZerebelläre Ataxie-Areflexie-Pes cavus-Optikusatrophie-sensorineurale Schwerhörigkeit-SyndromCAPOS-Syndrom
esSíndrome de ataxia cerebelosa-arreflexia-pies cavos-atrofia óptica-hipoacusia neurosensorialSíndrome CAPOS · Síndrome de ataxia cerebelosa-arreflexia-pies cavos-atrofia óptica-sordera neurosensorial
itAtassia cerebellare - areflessia - piede cavo - atrofia ottica - sordità neurosensoriale
nlCerebellaire ataxie - areflexie - pes cavus - opticusatrofie - sensorineuraal gehoorverlies-syndroomCAPOS-syndroom · Cerebellaire ataxie - areflexie - pes cavus - opticusatrofie - sensorineurale doofheid-syndroom
ptSíndrome de ataxia cerebelosa-arreflexia-pés cavus-atrofia óptica-perda auditiva neurossensorial
plAtaksja móżdżkowa - arefleksja - stopa wydrążona - atrofia nerwu wzrokowego - czuciowo-nerwowa utrata słuchuZespół CAPOS
csSyndrom zahrnující cerebelární ataxii, areflexii, pes cavus, optickou atrofii a senzorineurální ztrátu sluchuCAPOS syndrom
ukМозочкова атаксія-арефлексія-pes cavus-атрофія зорового нерва-сенсоневральна втрата слухуСиндром CAPOS · Синдром мозочкової атаксії-рефлексії-pes cavus-атрофії зорового нерва-сенсоневральної глухоти
zh小脑共济失调-反射消失-弓形足-视神经萎缩-感音神经性耳聋综合征CAPOS综合征
trSerebellar ataksi-arefleksi-pes kavus-optik atrofi-sensörinöral işitme kaybı sendromuSerebellar ataksi-arefleksi-pes kavus-optik atrofi-sensörinöral sağırlık sendromu · CAPOS sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM601338Evalidated
ICD-10G11.1NTBTattributedvalidated
MONDO0011038Evalidated
MeSHC535351Evalidated
UMLSC1832466Evalidated
GARD1188Evalidated

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 (3):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ATP1A3Disease-causing germline mutation(s) (gain of function) inAssessedHGNC:801ENSG0000010540918235019q13.2ATPase Na+/K+ transporting subunit alpha 324468074[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families10 casesWorldwideCase(s)Validated24468074[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_24468074[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

13 annotations · validated 2017-11-06
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001284Areflexia
HP:0001251Ataxia
HP:0001298Encephalopathy
HP:0001324Muscle weakness
HP:0000648Optic atrophy
HP:0000407Sensorineural hearing impairment
Occasional (29-5%)
HP:0000496Abnormality of eye movement
HP:0000729Autistic behavior
HP:0100543Cognitive impairment
HP:0002015Dysphagia
HP:0001332Dystonia
HP:0001761Pes cavus
HP:0001250Seizure

Run the differential on the 6 obligate / very frequent terms

Annotation source: 20301294[PMID]

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Sources for this card