raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:137639

Hypomyelinating leukodystrophy-ataxia-hypodontia-hypomyelination syndrome

Synonyms: Ataxia-delayed dentition-hypomyelination syndrome

Type
Clinical subtype
Group
Subtype of disorder
Inheritance
Autosomal recessive
Age of onset
Infancy, Neonatal
Status
active

This disease is described under 4H leukodystrophy

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enHypomyelinating leukodystrophy-ataxia-hypodontia-hypomyelination syndromeAtaxia-delayed dentition-hypomyelination syndrome
frSyndrome de leucoencéphalopathie-ataxie-hypodontie-hypomyélinisationSyndrome d'ataxie-retard de dentition-hypomyélinisation
deLeukoenzephalopathie-Ataxie-Hypodontie-Hypomyelinisierung-SyndromAtaxie - verzögerter Zahndurchbruch - Hypomyelinisierung
esSíndrome de leucodistrofia-hipodoncia-ataxia-hipomielinizaciónAtaxia-retraso en la dentición-hipomielinización
itSindrome da leucodistrofia ipomielinizzante, atassia, ipodontia e ipomielinizzazioneAtassia - ritardo della dentizione - ipomielinizzazione
nlHypomyeliniserende leukodystrofie - ataxie - hypodontie - hypomyelinisatie-syndroomAtaxie - vertraagde dentitie - hypomyelinisatie-syndroom
ptSíndrome de leucodistrofia hipomielinizante-ataxia-hipodontia-hipomielinização
plZespół leukoencefalopatii, ataksji, hipodoncji i hipomielinizacjiAtaksja - opóźnione wyrzynanie zębów - hipomielinizacja
csSyndrom zahrnující leukoencefalopatii, ataxii, hypodoncii a hypomyelinizaciSyndrom zahrnující ataxii, opožděnou dentici a hypomyelinizaci
ukСиндром гіпомієлінізуючої лейкодистрофії-атаксії-гіподонтії-гіпомієлінізаціїСиндром затримки прорізування зубів-гіпомієлінізації з атаксією
zh髓鞘形成不足脑白质营养不良-共济失调-牙发育不良-髓鞘形成不足综合征共济失调-牙发育不良-髓鞘减少综合征
trHipomiyelinizan lökodistrofi-ataksi-hipodonti-hipomiyelinasyon sendromuAtaksi-gecikmeli dentisyon-hipomiyelinasyon sendromu
2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM607694NTBTvalidated
ICD-10E75.2NTBTattributedvalidated
MONDO0011897Evalidated
UMLSC4706676Evalidated

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
POLR3ADisease-causing germline mutation(s) inAssessedHGNC:30074ENSG0000014860661425810q22.3RNA polymerase III subunit A27506977[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families8 casesWorldwideCase(s)Validated15851747[PMID]_17712733[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_15851747[PMID]_17712733[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

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card