Reversible multiorgan system involvement in a neonate with complex IV deficiency.

Area of Science:

• Biochemistry
• Genetics
• Pediatrics

Background:

• Mitochondrial respiratory chain deficiencies are a significant cause of neonatal liver disease.
• Severe neonatal lactic acidosis often indicates a poor prognosis in these cases.

Observation:

• A neonate presented with acute liver failure and severe lactic acidosis.
• Muscle and liver biopsies revealed a profound deficiency in mitochondrial complex IV.

Findings:

• The neonate showed complete clinical resolution by 3 months of age.
• Biochemical evidence of complex IV deficiency in muscle tissue was reversible.

Implications:

• This case demonstrates that a severe neonatal phenotype of mitochondrial complex IV deficiency can be reversible.
• Findings are crucial for accurate prognostic and genetic counseling for neonates with similar conditions.