raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:99901

Acyl-CoA dehydrogenase 9 deficiency

Synonyms: ACAD9 deficiency

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

A rare disorder characterized by neurological dysfunction, hepatic failure and cardiomyopathy due to a deficiency of complex I of the respiratory chain.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enAcyl-CoA dehydrogenase 9 deficiencyACAD9 deficiency
frDéficit en acyl-CoA déshydrogénase 9Déficit en ACAD9
deAcyl-CoA-Dehydrogenase 9-Mangel
esDeficiencia de acil-CoA deshidrogenasa 9
itDeficit di acil-CoA deidrogenasi, tipo 9
nlAcyl-CoA-dehydrogenase 9-deficiëntieACAD9-deficiëntie
ptDeficiência de acil-CoA desidrogenase 9
plNiedobór dehydrogenazy 9 acyl-CoA= en
csDeficit dehydrogenázy acyl-CoA 9ACAD9 deficit
ukДефіцит ацил-КоА-дегідрогенази 9Дефіцит ACAD9
zh家族性乙酰辅酶脱氢酶9型缺乏ACAD9 缺陷
trAçil-CoA dehidrogenaz 9 eksikliğiACAD9 eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM611126Evalidated
ICD-10E71.3NTBTattributedvalidated
ICD-115C52.01NTBTattributedvalidated
MONDO0012624Evalidated
MeSHC567006Evalidated
UMLSC1970173Evalidated
MedDRA10081518Evalidated

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 (4):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ACAD9Disease-causing germline mutation(s) inAssessedHGNC:21497ENSG000001776466111033q21.3acyl-CoA dehydrogenase family member 917564966[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families23 casesWorldwideCase(s)Validated24158852[PMID]_26669660[PMID]
Point prevalenceUnknown—WorldwideClass onlyValidatedORPHANET_26669660[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

29 annotations · validated 2018-01-24
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0011923Decreased activity of mitochondrial complex I
Frequent (79-30%)
HP:0001635Congestive heart failure
HP:0003234Decreased circulating carnitine concentration
HP:0001644Dilated cardiomyopathy
HP:0003458EMG: myopathic abnormalities
HP:0002910Elevated circulating hepatic transaminase concentration
HP:0008331Elevated creatine kinase after exercise
HP:0045045Elevated plasma acylcarnitine levels
HP:0001298Encephalopathy
HP:0001508Failure to thrive
HP:0003473Fatigable weakness
HP:0001290Generalized hypotonia
HP:0003324Generalized muscle weakness
HP:0001397Hepatic steatosis
HP:0001987Hyperammonemia
HP:0001639Hypertrophic cardiomyopathy
HP:0002151Increased circulating lactate concentration
HP:0025435Increased circulating lactate dehydrogenase concentration
HP:0003128Lactic acidosis
HP:0003326Myalgia
HP:0003198Myopathy
HP:0008151Prolonged prothrombin time
HP:0001873Thrombocytopenia
Occasional (29-5%)
HP:0006554Acute hepatic failure
HP:0011695Cerebellar hemorrhage
HP:0002181Cerebral edema
HP:0003215Dicarboxylic aciduria
HP:0001958Nonketotic hypoglycemia
HP:0001645Sudden cardiac death

Run the differential on the 1 obligate / very frequent terms

Annotation source: 25721401[PMID]_22499348[PMID]_21057504[PMID]_17564966[PMID]_27233227[PMID]

7

Sources for this card