raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:268173

Intermittent maple syrup urine disease

Synonyms: Intermittent BCKD deficiency · Intermittent MSUD · Intermittent branched-chain alpha-ketoacid dehydrogenase deficiency

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

Intermittent maple syrup urine disease (intermittent MSUD) is a mild form of MSUD where patients (when well) are asymptomatic with normal levels of branched-chain amino acids (BCAAs) but with catabolic stress are at risk of acute decompensation with ketoacidosis, which can lead to cerebral edema and coma if untreated.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enIntermittent maple syrup urine diseaseIntermittent BCKD deficiency · Intermittent MSUD · Intermittent branched-chain alpha-ketoacid dehydrogenase deficiency
frMaladie des urines sirop d'érable, forme intermittenteCétoacidurie à chaînes ramifiées intermittente · Déficit en BCKD, forme intermittente · Déficit en complexe de la déshydrogénase des alpha-cétoacides à chaîne ramifiée, forme intermittente · Leucinose intermittente · MSUD intermittente · Maladie des urines à odeur de sirop d'érable, forme intermittente
deAhornsirup-Krankheit, intermittierendeBCKD-Mangel, intermittierender · MSUD, intermittierend · Verzweigtkettige alpha-Ketosäuredehydrogenase-Mangel, intermittierend
esEnfermedad de la orina con olor a jarabe de arce intermitenteDeficiencia de BCKD intermitente · Deficiencia de alfa-cetoácido deshidrogenasa de cadena ramificada intermitente · EOOJA intermitente · MSUD intermitente
itMalattia delle urine a scrioppo di acero, tipo intermittenteDeficit della 2-chetoacido deidrogenasi a catena ramificata, tipo intermittente · Deficit intermittente della chetoacido deidrogenasi a catena ramificata · Deficit intermittente di BCKD · MSUD intermittente
nlIntermitterende maple syrup urine diseaseIntermitterende BCKD-deficiëntie · Intermitterende MSUD · Intermitterende ahornsiroopurineziekte · Intermitterende deficiëntie van vertakte keten-alfa-ketozuurdehydrogenase · Intermitterende esdoornsiroopurineziekte
ptDoença da urina xarope de bordo intermitenteDeficiência de BCKD intermitente · Deficiência de desidrogenase dos alfa-cetoácidos de cadeia ramificada intermitente · MSUD intermitente
plPostać przerywana choroby syropu klonowegoPostać przerywana MSUD · Przerywany Niedobór BCKD · Przerywany Niedobór dehydrogenazy ketokwasów rozgałęzionych
csIntermitentní forma leucinózyIntermitentní forma nemoci javorového sirupu · Intermitentní forma deficitu BCKD · Intermitentní forma MSUD · Intermitentní forma deficitu dehydrogenázy větvených 2-ketokyselin
ukІнтермітуюча хвороба сечі кленового сиропуПереривчастий дефіцит BCKD · Переривчастий дефіцит альфа-кетокислотної дегідрогенази з розгалуженим ланцюгом · Переривчастий MSUD
zh间歇性枫糖尿病中间型支链α酮酸脱氢酶缺乏症
trAralıklı akçaağaç şurubu idrar hastalığıAralıklı MSUD · Aralıklı BCKD eksikliği · Aralıklı dallı zincirli alfa-ketoasit dehidrojenaz eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM248600BTNTvalidated
OMIM620698BTNTvalidated
OMIM620699BTNTvalidated
ICD-10E71.0NTBTattributedvalidated
ICD-115C50.D0NTBTindexvalidated
MONDO0017053Evalidated
UMLSC0268569Evalidated

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

3 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
BCKDHBDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:987ENSG000000831232486116q14.1branched chain keto acid dehydrogenase E1 subunit beta20301495[PMID]
DBTDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:2698ENSG000001379922486101p21.2dihydrolipoamide branched chain transacylase E220301495[PMID]
BCKDHADisease-causing germline mutation(s) inAssessedHGNC:986ENSG0000024809860834819q13.2branched chain keto acid dehydrogenase E1 subunit alpha20301495[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Prevalence at birthUnknown—WorldwideClass onlyValidatedORPHANET
Point prevalenceUnknown—EuropeClass 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.

6

HPO phenotypes

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

7

Sources for this card