raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:134

Beta-ketothiolase deficiency

Synonyms: 3-ketothiolase deficiency · 3-oxothiolase deficiency · Alpha methylacetoacetic aciduria · Alpha-methyl-acetoacetyl-CoA thiolase deficiency · Mitochondrial acetoacetyl-coenzyme A thiolase deficiency · T2 deficiency

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

A rare, genetic organic aciduria affecting ketone body metabolism and the catabolism of isoleucine and characterized by intermittent ketoacidotic episodes associated with vomiting, dyspnea, tachypnoea, hypotonia, lethargy and coma, with an onset during infancy and usually ceasing by adolescence.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enBeta-ketothiolase deficiency3-ketothiolase deficiency · 3-oxothiolase deficiency · Alpha methylacetoacetic aciduria · Alpha-methyl-acetoacetyl-CoA thiolase deficiency · Mitochondrial acetoacetyl-coenzyme A thiolase deficiency · T2 deficiency
frDéficit en bêta-cétothiolaseCarence en bêta-cétothiolase · Déficit en 3-cétothiolase · Déficit en T2 · Déficit en alpha-méthyl-acétoacétyl-CoA thiolase
deBeta-Ketothiolase-Mangel3-Ketothiolase-Mangel · 3-Oxo-Thiolase-Mangel · Alpha-Methyl-Acetessigsäure-Azidurie · Alpha-Methyl-Acetoacetyl-CoA Thiolase-Mangel · Mitochondrialer Acetoacetyl-Coenzym A-Thiolase-Mangel · T2-Mangel
esDeficiencia de beta-cetotiolasaAciduria alfa metil-acetoacética · Deficiencia T2 · Deficiencia de 3-cetotiolasa · Deficiencia de 3-oxatiolano · Deficiencia de acetoacetil-coenzima A tiolasa mitocondrial · Deficiencia de alfa-metil-acetoacetil-CoA tiolasa
itDeficit di beta-chetotiolasiAciduria alfa-metilacetoacetica · Deficit di 3-chetotiolasi · Deficit di 3-ossotiolasi · Deficit di T2 · Deficit di alfa-metil-acetoacetil-CoA tiolasi · Deficit mitocondriale di acetoacetil-Coenzima A tiolasi
nlBèta-ketothiolasedeficiëntieAlfa-methyl-acetoacetyl-CoA-thiolasedeficiëntie · Alfa-methylacetoacetaatacidurie · Mitochondriaal acetoacetyl-co-enzym A-thiolasedeficiëntie · T2-deficiëntie · 3-ketothiolasedeficiëntie · 3-oxothiolasedeficiëntie
ptDeficiência de beta-cetotiolaseDeficiência de MAT · Deficiência de alfa-2-metil-acetoacetil-CoA tiolase
plNiedobór beta ketotiolazyKwasica alfa metyloacetooctowa · Niedobór 3-ketotiolazy · Niedobór 3-oksotiolazy · Niedobór mitochondrialnej tiolazy acetoacetylo-koenzymu A · Niedobór T2 · Niedobór tiolazy alfa-metylo-acetoacetylo-CoA
csDeficit beta-ketothiolázyDeficit 3-ketothiolázy · Deficit 3-oxothiolázy · Alfa-methyl acetoacetátová acidurie · Deficit alfa-methylacetoacetyl-CoA-thiolázy · Deficit mitochondriální acetoacetyl-CoA-thiolázy · Deficit T2
ukДефіцит бета-кетотіолазиДефіцит 3-кетотіолази · Дефіцит 3-окситіолази · Альфа-метилацетоуксусная ацидурія · Дефіцит альфа-метил-ацетоацетил-КоА тіолази · Дефіцит мітохондріальної ацетоацетил-коензиму А тіолази · Дефіцит Т2
zhβ-酮硫解酶缺乏线粒体乙酰乙酰基-辅酶A硫解酶缺乏
trBeta-ketotiolaz eksikliğiT2 eksikliği · 3-oksotiyolaz eksikliği · 3-ketotiyolaz eksikliği · Alfa metilasetoasetik asidüri · Alfa-metil-asetoasetil-KoA tiyolaz eksikliği · Mitokondriyal asetoasetil-koenzim A tiyolaz eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM203750Evalidated
ICD-10E71.1NTBTattributedvalidated
ICD-115C50.DYNTBTindexvalidated
MONDO0008760Evalidated
MeSHC535434Evalidated
UMLSC1536500Evalidated
GARD872Evalidated
MedDRA10067728Evalidated

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
ACAT1Disease-causing germline mutation(s) inAssessedHGNC:93ENSG0000007523960780911q22.3acetyl-CoA acetyltransferase 123430882[PMID]
5

Prevalence and incidence

5 records
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyValidatedORPHANET_[EXPERT]
Prevalence at birth1-9 / 1 000 0000.72 / 100 000AustraliaValue and classValidated10626578[PMID]_[EXPERT]
Prevalence at birth1-9 / 1 000 0000.43 / 100 000United StatesValue and classValidated21669895[PMID]_[EXPERT]
Prevalence at birth1-9 / 1 000 0000.98 / 100 000ChinaValue and classValidated31156707[PMID]_[EXPERT]
Prevalence at birth1-9 / 1 000 0000.53 / 100 000Viet NamValue and classValidated28220263[PMID]_[EXPERT]

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

42 annotations · validated 2019-05-13
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0011446Abnormality of higher mental function
HP:0001941Acidosis
HP:0001945Fever
HP:0002149Hyperuricemia
HP:0002919Ketonuria
HP:0001942Metabolic acidosis
HP:0002789Tachypnea
HP:0002013Vomiting
Frequent (79-30%)
HP:0000741Apathy
HP:0001259Coma
HP:0012735Cough
HP:0001944Dehydration
HP:0002014Diarrhea
HP:0001262Excessive daytime somnolence
HP:0001987Hyperammonemia
HP:0001974Increased total leukocyte count
HP:0001993Ketoacidosis
HP:0004372Reduced consciousness
HP:0001894Thrombocytosis
Occasional (29-5%)
HP:0012705Abnormal metabolic brain imaging by MRS
HP:0000713Agitation
HP:0002039Anorexia
HP:0001251Ataxia
HP:0500001Body odor
HP:0000969Edema
HP:0007308Extrapyramidal dyskinesia
HP:0002240Hepatomegaly
HP:0003074Hyperglycemia
HP:0000822Hypertension
HP:0001943Hypoglycemia
HP:0001265Hyporeflexia
HP:0002615Hypotension
HP:0001252Hypotonia
HP:0002151Increased circulating lactate concentration
HP:0001270Motor delay
HP:0012523Oral aversion
HP:0000980Pallor
HP:0001250Seizure
HP:0001257Spasticity
HP:0001824Weight loss
Very rare (<4-1%)
HP:0001256Intellectual disability, mild
HP:0010864Intellectual disability, severe

Run the differential on the 8 obligate / very frequent terms

Annotation source: 28689740[PMID]_28220263[PMID]_9700610[PMID]_4812006[PMID]_4143539[PMID]

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Sources for this card