raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:440706

Ribose-5-P isomerase deficiency

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

Ribose-5-P isomerase deficiency is an extremely rare, hereditary, disorder of pentose phosphate metabolism characterized by progressive leukoencephalopathy and a highly increased ribitol and D-arabitol levels in the brain and body fluids. Clinical presentation includes psychomotor delay, epilepsy, and childhood-onset slow neurological regression with ataxia, spasticity, optic atrophy and sensorimotor neuropathy.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enRibose-5-P isomerase deficiency
frDéficit en ribose-5-phosphate isomerase
deRibose-5-phosphat-Isomerase-Mangel
esDeficiencia de ribosa-5-P isomerasa
itDeficit di ribosio-5-P isomerasi
nlRibose-5-P isomerase-deficiëntie
ptDéfice de ribose-5-P isomerase
plNiedobór izomerazy rybozo-5-P
csDeficit ribóza-5-fosfát izomerázy
ukДефіцит рибозо-5-Р ізомерази
zh核糖-5-磷酸异构酶缺乏症
trRiboz-5-P izomeraz eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM608611Evalidated
ICD-10E74.8NTBTattributedvalidated
ICD-115C51.0NTBTattributedvalidated
MONDO0012073Evalidated
MeSHC563212Evalidated
UMLSC1291609Evalidated

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
RPIADisease-causing germline mutation(s) inAssessedHGNC:10297ENSG000001535741804302p11.2ribose 5-phosphate isomerase A14988808[PMID]_20499043[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families1 casesWorldwideCase(s)Validated14988808[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_14988808[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