raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:641361

Neurodevelopmental delay-hypotonia-cerebellar ataxia-cardiac conduction defects syndrome

Synonyms: Cerebellar ataxia-brain abnormalities-cardiac conduction defects syndrome · Neurodevelopmental delay-hypotonia-cerebellar atrophy-cardiac conduction defects syndrome

Type
Disease
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Infancy
Status
active

A rare genetic neurological syndrome characterized by cerebellar ataxia, neurodevelopmental delay, poor motor development and growth, mild to severe intellectual disability and infantile-onset hypotonia. Many patients have cardiac conduction and rhythm anomalies (including bundle branch block, bradycardia, sinus node dysfunction, intraventricular conduction delay, atrioventricular block, and ventricular tachycardia) in childhood or adolescence. Additional clinical features may include variable ocular anomalies and dysmorphic features.

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Names in Orphadata languages

10 of 12 languages
LangNameSynonyms
enNeurodevelopmental delay-hypotonia-cerebellar ataxia-cardiac conduction defects syndromeCerebellar ataxia-brain abnormalities-cardiac conduction defects syndrome · Neurodevelopmental delay-hypotonia-cerebellar atrophy-cardiac conduction defects syndrome
frSyndrome de retard neurodéveloppemental-hypotonie-ataxie cérébelleuse-troubles de la conduction cardiaqueAtaxie cérébelleuse-anomalies cérébrales-troubles de la conduction cardiaque · Syndrome de retard neurodéveloppemental-hypotonie-atrophie cérébelleuse-troubles de la conduction cardiaque
deNeurologische Entwicklungsverzögerung-Hypotonie-zerebelläre Ataxie-Herzleitungsstörungen-SyndromSyndrom der neurologischen Entwicklungsverzögerung, Hypotonie, zerebellären Atrophie und kardialen Überleitungsstörungen · Zerebelläre Ataxie-Hirnanomalien-Herzleitungsstörungen-Syndrom
esSíndrome de retraso del neurodesarrollo-hipotonía-ataxia cerebelosa-defectos de la conducción cardiacaSíndrome de ataxia cerebelosa-anomalías cerebrales-defectos de la conducción cardiaca · Síndrome de retraso del neurodesarrollo-hipotonía-atrofia cerebelosa-defectos de la conducción cardiaca
itSindrome ritardo dello sviluppo neurologico-ipotonia-atassia cerebellare-difetti della conduzione cardiacaSindrome atassia cerebellare-anomalie cerebrali-difetti della conduzione cardiaca · Sindrome ritardo dello sviluppo neurologico-ipotonia-atrofia cerebellare-difetti della conduzione cardiaca
nlNeurologische ontwikkelingsachterstand - hypotonie - cerebellaire ataxie - hartgeleidingsdefecten-syndroomNeurologische ontwikkelingsachterstand - hypotonie - cerebellaire atrofie - hartgeleidingsdefecten-syndroom · Cerebellaire ataxie - hersenafwijkingen - hartgeleidingsdefecten-syndroom
ptSíndrome de atraso do neurodesenvolvimento-hipotonia-ataxia cerebelosa-defeitos da condução elétrica cardíacaSíndrome de ataxia cerebelosa-anomalias cerebrais-anomalias da condução elétrica cardíaca · Síndrome de perturbação do neurodesenvolvimento-hipotonia-atrofia cerebelosa-anomalias da condução elétrica cardíaca
plZespół opóźnienia neurorozwojowego - hipotonii - ataksji móżdżkowej - zaburzeń przewodnictwa sercowego= en
csSyndrom zahrnující neurovývojové opoždění, hypotonii, cerebelární ataxii a poruchy srdečního vedení= en
ukСиндром затримки нервового розвитку-гіпотонії-мозочкової атаксії-вади серцевої провідностіСиндром мозочкової атаксії - аномалії розвитку головного мозку - вад серцевої провідності · Синдром затримки нервового розвитку - гіпотонії - атрофії мозочка - вад серцевої провідності

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM619576Evalidated
ICD-10G11.1NTBTattributedvalidated
MONDO0859200Evalidated
UMLSC5816792Evalidated

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
EXOSC5Disease-causing germline mutation(s) inAssessedHGNC:24662ENSG0000007734860649219q13.2exosome component 530950035[PMID]_32504085[PMID]
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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families10 casesWorldwideCase(s)Validated34089229[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated34089229[PMID]_ORPHANET

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