raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:447893

Hypomyelination-cerebellar atrophy-hypoplasia of the corpus callosum syndrome

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

This disease is described under 4H leukodystrophy

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enHypomyelination-cerebellar atrophy-hypoplasia of the corpus callosum syndrome
frSyndrome d'hypomyélinisation cérébrale diffuse-atrophie du cervelet-hypoplasie du corps calleux
deHypomyelinisierung-zerebelläre Atrophie-Corpus callosum-Hypoplasie-Syndrom
esSíndrome de hipomielinización-atrofia cerebelosa-hipoplasia del cuerpo calloso
itSindrome ipomielinizzazione-atrofia cerebellare-ipoplasia del corpo calloso
nlHypomyelinisatie - cerebellaire atrofie - hypoplasie van corpus callosum-syndroom
ptSíndrome de hipomielinização-atrofia cerebelosa-hipoplasia do corpo caloso
plZespół hipomielinizacji, atrofii móżdżku i hipoplazji ciała modzelowatego
csSyndrom zahrnující hypomyelinizaci, mozečkovou atrofii a hypoplázii corpus callosum
ukСиндром гіпомієлінізації-атрофії мозочка-гіпоплазії мозолистого тіла
zh胼胝体小脑发育不良伴髓鞘化落后
trKorpus kallozum sendromunun hipomiyelinizasyon-serebellar atrofi-hipoplazi
2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM607694NTBTvalidated
ICD-10E75.2NTBTattributedvalidated
MONDO0018655Evalidated
UMLSC5681201Evalidated

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
POLR3ADisease-causing germline mutation(s) inAssessedHGNC:30074ENSG0000014860661425810q22.3RNA polymerase III subunit A22036171[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families4 casesWorldwideCase(s)Validated18851904[PMID]_22036171[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_18851904[PMID]_22036171[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