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GTR Home > Conditions/Phenotypes > Mitochondrial complex 4 deficiency, nuclear type 12

Mitochondrial complex 4 deficiency, nuclear type 12

Synonyms
MITOCHONDRIAL COMPLEX IV DEFICIENCY, NUCLEAR TYPE 12

Summary

Mitochondrial complex IV deficiency nuclear type 12 (MC4DN12) is an autosomal recessive metabolic disorder characterized by the onset of neurologic dysfunction in early infancy. Affected individuals demonstrate hypotonia with poor head control, profoundly delayed global development with inability to fix and follow, poor overall growth, abnormal spasms or myoclonus, and seizures. Most patients die in the first years of life; those that survive have spastic quadriplegia, feeding difficulties necessitating tube feeding, and profoundly impaired intellectual development with poor or absent communication. More variable features include cortical blindness, nystagmus, scoliosis, and hearing impairment. Brain imaging shows abnormalities consistent with Leigh syndrome (see 256000), as well as cystic cavitation. Laboratory studies show lactic acidosis, increased serum creatine kinase, and decreased levels and activity of mitochondrial respiratory complex IV (summary by Lim et al., 2014). For a discussion of genetic heterogeneity of mitochondrial complex IV (cytochrome c oxidase) deficiency, see 220110. [from OMIM]

Available tests

14 tests are in the database for this condition.

Clinical tests (14 available)

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: C19orf79, MC4DN12, PET100
    Summary: PET100 cytochrome c oxidase chaperone

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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