raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:3208

Isolated succinate-CoQ reductase deficiency

Synonyms: Isolated mitochondrial respiratory chain complex II deficiency · Isolated succinate dehydrogenase deficiency · Isolated succinate-coenzyme Q reductase deficiency · Isolated succinate-ubiquinone reductase deficiency

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

A rare, mitochondrial oxidative phosphorylation disorder characterized by a highly variable phenotype. The severe, multisystemic disease involves brain, heart, muscles, liver, kidneys, and eyes and results in death in infancy. Mildly affected individuals have only isolated cardiac or muscle involvement in the adulthood. Histochemical and biochemical analysis reveals a global reduction of succinate dehydrogenase activity.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enIsolated succinate-CoQ reductase deficiencyIsolated mitochondrial respiratory chain complex II deficiency · Isolated succinate dehydrogenase deficiency · Isolated succinate-coenzyme Q reductase deficiency · Isolated succinate-ubiquinone reductase deficiency
frDéficit isolé en succinate-CoQ réductaseDéficit isolé en complexe II de la chaîne respiratoire mitochondriale · Déficit isolé en succinate déshydrogénase · Déficit isolé en succinate-coenzyme Q réductase · Déficit isolé en succinate-ubiquinone réductase
deSuccinat-Coenzym-Q-Reduktase-Mangel, isolierterIsolierter mitochondrialer Atmungskettendefekt im Komplex II · Succinat-Ubiquinon-Reduktase-Mangel, isolierter
esDeficiencia aislada de succinato-CoQ reductasaDeficiencia aislada de succinato-coenzima Q reductasa · Deficiencia aislada de succinato-ubiquinona reductasa · Deficiencia aislada del complejo 2 de la cadena respiratoria mitocondrial · Deficiencia aislada del complejo II de la cadena respiratoria mitocondrial
itDeficit isolato di succinato-CoQ reduttasiDeficit isolato del complesso II della catena respiratoria mitocondriale · Deficit isolato di succinato-Coenzima Q reduttasi · Deficit isolato di succinato-ubichinone reduttasi
nlGeïsoleerde succinaat-CoQ-reductasedeficiëntieGeïsoleerde mitochondriale ademhalingsketencomplex II-deficiëntie · Geïsoleerde succinaat-co-enzym Q-reductasedeficiëntie · Geïsoleerde succinaat-ubiquinon-reductasedeficiëntie
ptDeficiência de succinato-CoQ redutase isoladaDeficiência de complexo II da cadeia respiratória mitocondrial isolada · Deficiência de succinato desidrogenase isolada · Deficiência de succinato-coenzima Q redutase isolada · Deficiência de succinato-ubiquinona redutase isolada
plIzolowany Niedobór reduktazy sukcynylo-CoQIzolowany Niedobór kompleksu II mitochondrialnego łańcucha oddechowego · Izolowany Niedobór reduktazy sukcynylo-koenzymu Q · Izolowany Niedobór reduktazy sukcynylo-ubichinionu
csIzolovaný deficit sukcinát-CoQ reduktázyIzolovaný deficit sukcinát-koenzym Q reduktázy · Izolovaný deficit sukcinát-ubichinon reduktázy · Izolovaný deficit mitochondriálního komplexu II respiračního řetězce
ukІзольований дефіцит сукцинат-CoQ-редуктазиІзольований дефіцит комплексу ІІ мітохондріального дихального ланцюга · Ізольований дефіцит сукцинатдегідрогенази · Ізольований дефіцит сукцинат-коензиму Q-редуктази · Ізольований дефіцит сукцинат-убіхінон-редуктази
zh孤立型琥珀酸-辅酶Q还原酶缺乏症孤立型线粒体呼吸链复合物2缺乏症
trİzole süksinat-CoQ redüktaz eksikliğiİzole süksinat dehidrojenaz eksikliği · İzole süksinat-koenzim Q redüktaz eksikliği · İzole süksinat-ubikinon redüktaz eksikliği · İzole mitokondriyal solunum zinciri kompleksi II eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM252011BTNTvalidated
OMIM619166BTNTvalidated
OMIM619167BTNTvalidated
OMIM619224BTNTvalidated
ICD-10G71.3NTBTattributedvalidated
ICD-115C53.2YNTBTindexvalidated
MeSHC565375Evalidated
UMLSC1855008Evalidated
GARD5053Evalidated

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

4 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
SDHDDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:10683ENSG0000020437060269011q23.1succinate dehydrogenase complex subunit D24367056[PMID]
SDHADisease-causing germline mutation(s) inAssessedHGNC:10680ENSG000000735786008575p15.33succinate dehydrogenase complex flavoprotein subunit A22972948[PMID]
SDHAF1Disease-causing germline mutation(s) inAssessedHGNC:33867ENSG0000020513861284819q13.12succinate dehydrogenase complex assembly factor 119465911[PMID]
SDHBDisease-causing germline mutation(s) inAssessedHGNC:10681ENSG000001171181854701p36.13succinate dehydrogenase complex iron sulfur subunit B22972948[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families37 casesWorldwideCase(s)Validated23322652[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidated23322652[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

50 annotations · validated 2019-01-21
HPOTerm (as annotated by Orphanet)Diagnostic
Frequent (79-30%)
HP:0005162Abnormal left ventricular function
HP:0001626Abnormality of the cardiovascular system
HP:0000478Abnormality of the eye
HP:0003487Babinski sign
HP:0002376Developmental regression
HP:0003693Distal amyotrophy
HP:0003388Easy fatigability
HP:0003324Generalized muscle weakness
HP:0002123Generalized myoclonic seizure
HP:0006801Hyperactive deep tendon reflexes
HP:0007083Hyperactive patellar reflex
HP:0007350Hyperreflexia in upper limbs
HP:0001639Hypertrophic cardiomyopathy
HP:0001712Left ventricular hypertrophy
HP:0001270Motor delay
HP:0002333Motor deterioration
HP:0007272Progressive psychomotor deterioration
HP:0003508Proportionate short stature
HP:0003701Proximal muscle weakness
HP:0007663Reduced visual acuity
HP:0003510Severe short stature
HP:0003756Skeletal myopathy
HP:0001257Spasticity
HP:0001824Weight loss
Occasional (29-5%)
HP:0005150Abnormal atrioventricular conduction
HP:0001251Ataxia
HP:0002474Expressive language delay
HP:0008872Feeding difficulties in infancy
HP:0011166Focal myoclonic seizure
HP:0002359Frequent falls
HP:0001290Generalized hypotonia
HP:0001511Intrauterine growth retardation
HP:0000737Irritability
HP:0006380Knee flexion contracture
HP:0006895Lower limb hypertonia
HP:0040196Mild microcephaly
HP:0011343Moderate global developmental delay
HP:0012817Noncompaction cardiomyopathy
HP:0001250Seizure
HP:0003202Skeletal muscle atrophy
HP:0002313Spastic paraparesis
HP:0001285Spastic tetraparesis
Very rare (<4-1%)
HP:0000618Blindness
HP:0000726Dementia
HP:0000544External ophthalmoplegia
HP:0002505Loss of ambulation
HP:0000639Nystagmus
HP:0000580Pigmentary retinopathy
HP:0002421Poor head control
HP:0000076Vesicoureteral reflux

Annotation source: 6318158[PMID]_2710360[PMID]_7609447[PMID]_8174601[PMID]_1492653[PMID]_7839816[PMID]_12112045[PMID]_19465911[PMID]_16737791[PMID]_22972948[PMID]_23322652[PMID]_24367056[PMID]_26008905[PMID]

7

Sources for this card