Mitochondrial Complex IV Deficiency, Nuclear Type 1

**Semantic type:** Disease or Syndrome

**Definition:** An autosomal recessive condition caused by mutation(s) in the SURF1 gene, encoding surfeit locus protein 1. It is characterized by rapidly progressive neurodegeneration and encephalopathy with loss of motor and cognitive skills with onset between 5 and 18 months of age. It is one of several types of cytochrome c oxidase deficiencies caused by mutation(s) in nuclear encoded or mitochondrial encoded genes.

**Synonyms:** - MC4DN1