raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:255210

Mitochondrial DNA-associated Leigh syndrome

Synonyms: MILS · Maternally-inherited Leigh disease · Maternally-inherited infantile subacute necrotizing encephalopathy · mtDNA-associated Leigh syndrome

Type
Disease
Group
Disorder
Inheritance
Mitochondrial inheritance
Age of onset
Childhood, Infancy
Status
active

Maternally inherited Leigh syndrome is a rare subtype of Leigh syndrome characterized clinically by encephalopathy, lactic acidosis, seizures, cardiomyopathy, respiratory disorders and developmental delay, with onset in infancy or early childhood, and resulting from maternally-inherited mutations in mitochondrial DNA.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMitochondrial DNA-associated Leigh syndromeMILS · Maternally-inherited Leigh disease · Maternally-inherited infantile subacute necrotizing encephalopathy · mtDNA-associated Leigh syndrome
frSyndrome de Leigh associé à une mutation de l'ADN mitochondrialEncéphalomyopathie nécrosante subaiguë de transmission maternelle · MILS · Maladie de Leigh de transmission maternelle · Syndrome de Leigh associé à une mutation de l'ADNmt
deLeigh-Syndrom, mitochondriale DNA-assoziiertesEnzephalopathie, infantile nekrotisierende subakute, maternal vererbte · Leigh-Krankheit, maternal vererbte · MILS · mtDNA-assoziiertes Leigh-Syndrom
esSíndrome de Leigh asociado al ADN mitocondrialEncefalopatía necrotizante subaguda infantil de herencia materna · Enfermedad de Leigh de herencia materna · MILS · Síndrome de Leigh asociado al ADNmt
itSindrome di Leigh a trasmissione maternaEncefalopatia necrotizzante subacuta infantile a trasmissione materna · MILS · Malattia di Leigh a trasmissione materna
nlMitochondriaal DNA-geassocieerd syndroom van LeighMILS · Maternaal overgeërfde infantiele subacute necrotiserende encefalopathie · Maternaal overgeërfde ziekte van Leigh · mtDNA-geassocieerd syndroom van Leigh
ptSíndrome Leigh ADN mitocondrial-associadoDoença de Leigh com hereditariedade materna · Encefalopatia necrotizante subaguda infantil com hereditariedade materna · MILS · Síndrome Leigh ADN mitocondrial-associado
plZespół Leigha dziedziczony od matkiChoroba Leigha dziedziczona od matki · Dziecięca podostra encefalopatia martwicza dziedziczona od matki · MILS
csMaternálně zděděný Leighův syndromMILS · Leighova choroba zděděná po matce · Dětská subakutní nekrotizující encefalopatie zděděná po matce
ukМітохондріальна ДНК-асоційована хвороба ЛіУспадкована від матері дитяча підгостра некротична енцефалопатія · Хвороба Лі, що успадковується по материнській лінії · MILS · мтДНК-асоційований синдром Лі
zh线粒体DNA相关Leigh综合征母系遗传的婴儿亚急性坏死性脑病
trMitokondriyal DNA -ilişkili Leigh sendromuMILS · mtDNA-ilişkili Leigh sendromu · Maternal-geçişli Leigh hastalığı · Maternal-geçişli infantil subakut nekrotizan ensefalopati

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM500017Evalidated
ICD-10G31.8NTBTattributedvalidated
ICD-118C73.YNTBTindexvalidated
MONDO0016814Evalidated
MeSHC536035Evalidated
UMLSC2931092Evalidated
GARD3671Evalidated

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 (2):

No children.

Codes that Orphanet moved or referred to this one:

4

Genes

11 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
MT-ATP6Disease-causing germline mutation(s) inAssessedHGNC:7414ENSG00000198899516060mitochondriamitochondrially encoded ATP synthase membrane subunit 619433277[PMID]_20301352[PMID]
MT-ND1Disease-causing germline mutation(s) inAssessedHGNC:7455ENSG00000198888516000mitochondriamitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 120301352[PMID]_24830958[PMID]
MT-ND2Disease-causing germline mutation(s) inAssessedHGNC:7456ENSG00000198763516001mitochondriamitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 216738010[PMID]_16996290[PMID]_20301352[PMID]
MT-ND3Disease-causing germline mutation(s) inAssessedHGNC:7458ENSG00000198840516002mitochondriamitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 316023078[PMID]_20202874[PMID]_20301352[PMID]_22364517[PMID]
MT-ND4Disease-causing germline mutation(s) inAssessedHGNC:7459ENSG00000198886516003mitochondriamitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 420301352[PMID]_20502985[PMID]
MT-ND5Disease-causing germline mutation(s) inAssessedHGNC:7461ENSG00000198786516005mitochondriamitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 511938446[PMID]_14520659[PMID]_20301352[PMID]
MT-ND6Disease-causing germline mutation(s) inAssessedHGNC:7462ENSG00000198695516006mitochondriamitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 614595656[PMID]_20301352[PMID]_23813926[PMID]
MT-TKDisease-causing germline mutation(s) inAssessedHGNC:7489ENSG00000210156590060mitochondriamitochondrially encoded tRNA-Lys (AAA/G)20301352[PMID]_24374964[PMID]
MT-TL1Disease-causing germline mutation(s) inAssessedHGNC:7490ENSG00000209082590050mitochondriamitochondrially encoded tRNA-Leu (UUA/G) 19323566[PMID]_10356136[PMID]_20301352[PMID]
MT-TVDisease-causing germline mutation(s) inAssessedHGNC:7500ENSG00000210077590105mitochondriamitochondrially encoded tRNA-Val (GUN)11799391[PMID]_20301352[PMID]_24691472[PMID]
MT-TWDisease-causing germline mutation(s) inAssessedHGNC:7501ENSG00000210117590095mitochondriamitochondrially encoded tRNA-Trp (UGA/G)9266739[PMID]_19349200[PMID]_20301352[PMID]
5

Prevalence and incidence

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

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

53 annotations · validated 2019-04-09
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000816Abnormality of Krebs cycle metabolism
HP:0002490Increased CSF lactate
Frequent (79-30%)
HP:0001251Ataxia
HP:0002069Bilateral tonic-clonic seizure
HP:0002072Chorea
HP:0100660Dyskinesia
HP:0001332Dystonia
HP:0002572Episodic vomiting
HP:0001508Failure to thrive
HP:0008947Floppy infant
HP:0007183Focal T2 hyperintense basal ganglia lesion
HP:0002066Gait ataxia
HP:0002123Generalized myoclonic seizure
HP:0001276Hypertonia
HP:0002151Increased circulating lactate concentration
HP:0003648Lacticaciduria
HP:0001324Muscle weakness
HP:0000597Ophthalmoparesis
HP:0000580Pigmentary retinopathy
HP:0001250Seizure
HP:0007141Sensorimotor neuropathy
HP:0011344Severe global developmental delay
HP:0001257Spasticity
Occasional (29-5%)
HP:0000091Abnormal renal tubule morphology
HP:0031434Abnormal speech prosody
HP:0002104Apnea
HP:0002483Bulbar signs
HP:0031546Cardiac conduction abnormality
HP:0007108Demyelinating peripheral neuropathy
HP:0002376Developmental regression
HP:0001644Dilated cardiomyopathy
HP:0002015Dysphagia
HP:0002094Dyspnea
HP:0004885Episodic respiratory distress
HP:0001945Fever
HP:0001399Hepatic failure
HP:0002240Hepatomegaly
HP:0003348Hyperalaninemia
HP:0001347Hyperreflexia
HP:0001639Hypertrophic cardiomyopathy
HP:0002883Hyperventilation
HP:0001265Hyporeflexia
HP:0002045Hypothermia
HP:0012469Infantile spasms
HP:0003737Mitochondrial myopathy
HP:0100611Multiple glomerular cysts
HP:0000639Nystagmus
HP:0000648Optic atrophy
HP:0000510Rod-cone dystrophy
HP:0003481Segmental peripheral demyelination/remyelination
HP:0000407Sensorineural hearing impairment
Very rare (<4-1%)
HP:0003572Low plasma citrulline
HP:0003200Ragged-red muscle fibers

Run the differential on the 2 obligate / very frequent terms

Annotation source: 29101127[PMID]_21402391[PMID]_20301352[PMID]

7

Sources for this card