raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:187

Citrullinemia

Type
Category
Group
Group of disorders
Inheritance
Autosomal recessive
Age of onset
Adult, Neonatal
Status
active

Citrullinemia is an autosomal recessively inherited disorder of urea cycle metabolism and ammonia detoxification characterized by elevated concentrations of serum citrulline and ammonia. The disease presents with a large range of manifestations including neonatal hyperammonemic encephalopathy with lethargy, seizures and coma; hepatic dysfunction in all age groups; episodes of hyperammonemia and neuropsychiatric symptoms in children or adults, or, can be asymptomatic in some cases (detected in newborn screening programs). Citrullinemia is divided into two main groups that are encoded by different genes: citrullinemia type I (comprised of acute neonatal citrullinemia type I and adult-onset citrullinemia type I) and citrin deficiency (comprised of adult-onset citrullinemia type II and neonatal intrahepatic cholestasis due to citrin deficiency).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enCitrullinemia
frCitrullinémie
deZitrullinämieArginino-Succinat-Synthetase-Mangel · Citrullinämie
esCitrulinemia
itCitrullinemia
nlCitrullinemie
ptCitrulinemiaDeficiência de argininossuccinato sintetase
plCytrulinemia
csCitrulinémie
ukЦитрулінемія
zh瓜氨酸血症
trSitrülinemi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-115C50.A3Especificvalidated
MONDO0015991Evalidated
MONDO15991Evalidated
MeSHD020159Evalidated
UMLSC0175683Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

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Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

Children (2):

4

Genes

0 direct

Orphanet records no gene directly on this code.

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Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

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HPO phenotypes

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

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Sources for this card