raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:478029

Combined oxidative phosphorylation defect type 29

Synonyms: COXPD29

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

A rare mitochondrial oxidative phosphorylation disorder characterized by microcephaly, global developmental delay, spastic-dystonic movement disorder, intractable seizures, optic atrophy, autonomic dysfunction, and peripheral neuropathy. Serum lactate is increased, and muscle biopsy shows decreased activity of mitochondrial respiratory complexes I and III. Brain imaging reveals progressive cerebellar atrophy and delayed myelination.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enCombined oxidative phosphorylation defect type 29COXPD29
frDéficit combiné de la phosphorylation oxydative type 29= en
deKombinierter Defekt der oxidativen Phosphorylierung Typ 29= en
esDeficiencia combinada de la fosforilación oxidativa tipo 29= en
itDeficit combinato della fosforilazione ossidativa tipo 29
nlGecombineerde oxidatieve fosforylatiedeficiëntie type 29COXPD29 · Gecombineerde oxidatieve fosforyleringdeficiëntie type 29
ptDéfice combinado da fosforilação oxidativa tipo 29
plZłożony defekt fosforylacji oksydacyjnej typu 29= en
csKombinovaný defekt oxidativní fosforylace, typ 29= en
ukКомбінований дефект окисного фосфорилювання, тип 29= en
zh复合氧化磷酸化缺陷29型= en
trKombine oksidatif fosforilasyon defekti tip 29= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM616811Evalidated
ICD-10E88.8NTBTattributedvalidated
ICD-115C53.23NTBTattributedvalidated
MONDO0014781Evalidated
UMLSC5567607Evalidated

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 (4):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
TXN2Disease-causing germline mutation(s) (loss of function) inAssessedHGNC:17772ENSG0000010034860906322q12.3thioredoxin 226626369[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families1 casesWorldwideCase(s)Validated26626369[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_26626369[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

22 annotations · validated 2019-02-15
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0012332Abnormal autonomic nervous system physiology
HP:0003808Abnormal muscle tone
HP:0040078Axonal degeneration
HP:0002069Bilateral tonic-clonic seizure
HP:0011923Decreased activity of mitochondrial complex I
HP:0011924Decreased activity of mitochondrial complex III
HP:0012448Delayed myelination
HP:0100275Diffuse cerebellar atrophy
HP:0002579Gastrointestinal dysmotility
HP:0030884Gastrojejunal tube feeding in infancy
HP:0002283Global brain atrophy
HP:0002490Increased CSF lactate
HP:0002922Increased CSF protein concentration
HP:0002151Increased circulating lactate concentration
HP:0003739Myoclonic spasms
HP:0002180Neurodegeneration
HP:0001138Optic neuropathy
HP:0002370Poor coordination
HP:0011451Primary microcephaly
HP:0000488Retinopathy
HP:0011344Severe global developmental delay
HP:0002416Subependymal cysts

Run the differential on the 12 obligate / very frequent terms

Annotation source: 26626369[PMID]

7

Sources for this card