raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:17

Fatal infantile lactic acidosis with methylmalonic aciduria

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

Fatal infantile lactic acidosis with methylmalonic aciduria is a rare neurometabolic disease characterized by infantile onset of severe encephalomyopathy, lactic acidosis and elevated methylmalonic acid urinary excretion. Clinically it manifests with severe psychomotor delay, hypotonia, failure to thrive, feeding difficulties and dystonia. Epilepsy and multiple congenital anomalies may be associated.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFatal infantile lactic acidosis with methylmalonic aciduria
frAcidose lactique infantile fatale avec acidurie méthylmalonique
deFatale infantile Laktatazidose mit Methylmalonazidurie
esAcidosis láctica letal del lactante con aciduria metilmalónica
itAcidosi lattica infantile fatale con aciduria metilmalonica
nlFatale infantiele melkzuuracidose met methylmalonacidurieFatale infantiele lactaatacidose met methylmalonzuuracidurie · Mitochondriaal DNA-depletiesyndroom 9
ptAcidose láctica congénita infantil
plNoworodkowa kwasica mleczanowa z acydurią metylomalonową
csFatální kojenecká laktátová acidóza s methylmalonovou acidurií
ukФатальний молочнокислий ацидоз немовлят з метилмалоновою ацидурією
zh致死性婴儿乳酸性酸中毒伴甲基丙二酸尿症
trMetilmalonik asitüri ile letal infantil laktik asidoz

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM245400Evalidated
ICD-10E71.1NTBTattributedvalidated
ICD-115C53.20NTBTindexvalidated
MONDO0009504Evalidated
UMLSC4275183Evalidated
GARD3163Evalidated

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

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
SUCLG1Disease-causing germline mutation(s) inAssessedHGNC:11449ENSG000001635416112242p11.2succinate-CoA ligase GDP/ADP-forming subunit alpha19526370[PMID]_21639866[PMID]
5

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.

6

HPO phenotypes

64 annotations · validated 2021-07-07
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0002912Methylmalonic acidemia
HP:0012120Methylmalonic aciduria
Very frequent (99-80%)
HP:00035353-Methylglutaconic aciduria
HP:0012751Abnormal basal ganglia MRI signal intensity
HP:0012379Abnormal enzyme/coenzyme activity
HP:0008947Floppy infant
HP:0001263Global developmental delay
Frequent (79-30%)
HP:0002059Cerebral atrophy
HP:0011923Decreased activity of mitochondrial complex I
HP:0011924Decreased activity of mitochondrial complex III
HP:0008347Decreased activity of mitochondrial complex IV
HP:0002910Elevated circulating hepatic transaminase concentration
HP:0001298Encephalopathy
HP:0001508Failure to thrive
HP:0011968Feeding difficulties
HP:0001510Growth delay
HP:0001397Hepatic steatosis
HP:0002240Hepatomegaly
HP:0002490Increased CSF lactate
HP:0002151Increased circulating lactate concentration
HP:0001249Intellectual disability
HP:0003128Lactic acidosis
HP:0003202Skeletal muscle atrophy
Occasional (29-5%)
HP:0012087Abnormal mitochondrial shape
HP:0000718Aggressive behavior
HP:0002104Apnea
HP:0001266Choreoathetosis
HP:0001332Dystonia
HP:0001371Flexion contracture
HP:0002020Gastroesophageal reflux
HP:0000975Hyperhidrosis
HP:0002487Hyperkinetic movements
HP:0001276Hypertonia
HP:0001639Hypertrophic cardiomyopathy
HP:0001943Hypoglycemia
HP:0002045Hypothermia
HP:0012240Increased intramyocellular lipid droplets
HP:0003557Increased variability in muscle fiber diameter
HP:0002352Leukoencephalopathy
HP:0000252Microcephaly
HP:0001336Myoclonus
HP:0000508Ptosis
HP:0003200Ragged-red muscle fibers
HP:0002205Recurrent respiratory infections
HP:0002098Respiratory distress
HP:0003201Rhabdomyolysis
HP:0001250Seizure
HP:0000407Sensorineural hearing impairment
HP:0000736Short attention span
HP:0002360Sleep abnormality
HP:0000486Strabismus
HP:0002317Unsteady gait
HP:0002013Vomiting
Very rare (<4-1%)
HP:0004742Abnormal renal collecting system morphology
HP:0001680Coarctation of aorta
HP:0003219Ethylmalonic aciduria
HP:0000047Hypospadias
HP:0011611Interrupted aortic arch
HP:0000202Orofacial cleft
HP:0001643Patent ductus arteriosus
HP:0001655Patent foramen ovale
HP:0010442Polydactyly
HP:0003097Short femur
HP:0005792Short humerus

Run the differential on the 7 obligate / very frequent terms

Annotation source: 31240156[PMID]_28358460[PMID]

7

Sources for this card