raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:1460

Isolated complex III deficiency

Synonyms: Isolated CoQ-cytochrome C reductase deficiency · Isolated coenzyme Q-cytochrome C reductase deficiency · Isolated mitochondrial respiratory chain complex III deficiency · Isolated ubiquinone-cytochrome C reductase deficiency

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

Isolated complex III deficiency is a rare, genetic, mitochondrial oxidative phosphorylation disorder characterized by a wide spectrum of clinical manifestations ranging from isolated myopathy or transient hepatopathy to severe multisystem disorder (that may include hypotonia, failure to thrive, psychomotor delay, cardiomyopathy, encephalopathy, renal tubulopathy, hearing impairment, lactic acidosis, hypoglycemia and other signs and symptoms).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enIsolated complex III deficiencyIsolated CoQ-cytochrome C reductase deficiency · Isolated coenzyme Q-cytochrome C reductase deficiency · Isolated mitochondrial respiratory chain complex III deficiency · Isolated ubiquinone-cytochrome C reductase deficiency
frDéficit isolé en complex IIIDéficit isolé en CoQ-cytochrome C oxydoréductase · Déficit isolé en coenzyme Q-cytochrome C oxydoréductase · Déficit isolé en complexe III de la chaîne respiratoire mitochondriale · Déficit isolé en ubiquinone-cytochrome C oxydoréductase
deIsolierter mitochondrialer Atmungskettendefekt im Komplex IIICoQ-Cytochrom C-Reduktase-Mangel, isolierter · Coenzym Q-Cytochrom C-Reduktase-Mangel, isolierter · Coenzym-Q-Cytochrom-C-Reduktase-Mangel, isolierter · Ubiquinon-Cytochrom-C-Reduktase-Mangel, isolierter
esDeficiencia aislada del complejo IIIDeficiencia aislada de CoQ-citocromo C reductasa · Deficiencia aislada de coenzima Q-citocromo C reductasa · Deficiencia aislada de ubiquinona-citocromo C reductasa · Deficiencia aislada del complejo III de la cadena respiratoria mitocondrial
itDeficit isolato del complesso III
nlGeïsoleerde complex III-deficiëntieGeïsoleerde CoQ-cytochroom C-reductasedeficiëntie · Geïsoleerde co-enzym Q-cytochroom C-reductasedeficiëntie · Geïsoleerde mitochondriale ademhalingsketencomplex III-deficiëntie · Geïsoleerde ubiquinon-cytochroom C-reductasedeficiëntie
ptDeficiência de complexo III isoladaDeficiência de CoQ-citocromo C redutase isolada · Deficiência de coenzima Q-citocromo C redutase isolada · Deficiência de complexo III da cadeia respiratória mitocondrial isolada · Deficiência de ubiquinona-citocromo C redutase isolada
plIzolowany niedobór reduktazy CoQ-cytochromu CIzolowany Niedobór kompleksu III mitochondrialnego łańcucha oddechowego · Izolowany Niedobór reduktazy koenzymu Q-cytochromu C · Izolowany Niedobór reduktazy ubichinionu-cytochromu C
csIzolovaný deficit CoQ-cytochrom C reduktázyIzolovaný deficit koenzym Q-cytochrom C reduktázy · Izolovaný deficit ubichinon-cytochrom C reduktázy · Izolovaný deficit komplexu III mitochondriálního respiračního řetězce
ukІзольований дефіцит комплексу IIIІзольований дефіцит коензиму Q-цитохрому С-редуктази · Ізольований дефіцит КоQ-цитохрому С-редуктази · Ізольований дефіцит комплексу III мітохондріального дихального ланцюга · Ізольований дефіцит убіхінон-цитохром С-редуктази
zh孤立型III型复合物缺乏症孤立型线粒体呼吸链复合物3缺乏症
trİzole kompleks III eksikliğiİzole CoQ-sitokrom C redüktaz eksikliği · İzole koenzim Q-sitokrom C redüktaz eksikliği · İzole ubikinon-sitokrom C redüktaz eksikliği · İzole mitokondriyal solunum zinciri kompleksi III eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM124000BTNTvalidated
OMIM615157BTNTvalidated
OMIM615158BTNTvalidated
OMIM615159BTNTvalidated
OMIM615160BTNTvalidated
OMIM615453BTNTvalidated
OMIM615824BTNTvalidated
OMIM615838BTNTvalidated
OMIM616111BTNTvalidated
OMIM618775BTNTvalidated
OMIM620137BTNTvalidated
ICD-10G71.3NTBTattributedvalidated
ICD-115C53.2YNTBTindexvalidated
MONDO0015448Evalidated
MeSHC565128Evalidated
UMLSC1852372Evalidated
GARD8295Evalidated

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

11 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
BCS1LDisease-causing germline mutation(s) inAssessedHGNC:1020ENSG000000745826036472q35BCS1 ubiquinol-cytochrome c reductase complex chaperone17403714[PMID]_19162478[PMID]_25914718[PMID]
CYC1Disease-causing germline mutation(s) inAssessedHGNC:2579ENSG000001790911239808q24.3cytochrome c123910460[PMID]_25914718[PMID]
LYRM7Disease-causing germline mutation(s) inAssessedHGNC:28072ENSG000001866876158315q23.3-q31.1LYR motif containing 724014394[PMID]_25914718[PMID]
MT-CYBDisease-causing germline mutation(s) inAssessedHGNC:7427ENSG00000198727516020mitochondriamitochondrially encoded cytochrome b20862300[PMID]_25914718[PMID]
TTC19Disease-causing germline mutation(s) inAssessedHGNC:26006ENSG0000001129561381417p12tetratricopeptide repeat domain 1921278747[PMID]_25914718[PMID]
UQCC2Disease-causing germline mutation(s) inAssessedHGNC:21237ENSG000001372886144616p21.31ubiquinol-cytochrome c reductase complex assembly factor 224385928[PMID]_25914718[PMID]
UQCC3Disease-causing germline mutation(s) inAssessedHGNC:34399ENSG0000020492261609711q12.3ubiquinol-cytochrome c reductase complex assembly factor 325008109[PMID]_25914718[PMID]
UQCRBDisease-causing germline mutation(s) inAssessedHGNC:12582ENSG000001564671913308q22.1ubiquinol-cytochrome c reductase binding protein12709789[PMID]_25914718[PMID]
UQCRC2Disease-causing germline mutation(s) inAssessedHGNC:12586ENSG0000014074019132916p12.2ubiquinol-cytochrome c reductase core protein 223281071[PMID]_25914718[PMID]
UQCRFS1Disease-causing germline mutation(s) inAssessedHGNC:12587ENSG0000016902119132719q12ubiquinol-cytochrome c reductase, Rieske iron-sulfur polypeptide 132001716[PMID]
UQCRQDisease-causing germline mutation(s) inAssessedHGNC:29594ENSG000001644056120805q31.1ubiquinol-cytochrome c reductase complex III subunit VII18439546[PMID]_25914718[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families74 casesWorldwideCase(s)Validated31883641[PMID]_34750991[PMID]_11528392[PMID]_21278747[PMID]_23532514[PMID]_24368687[PMID]_24397319[PMID]_12709789[PMID]_18439546[PMID]_23281071[PMID]_23910460[PMID]_26912632[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated31883641[PMID]_34750991[PMID]_11528392[PMID]_21278747[PMID]_23532514[PMID]_24368687[PMID]_24397319[PMID]_12709789[PMID]_18439546[PMID]_23281071[PMID]_23910460[PMID]_26912632[PMID]_ORPHANET

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