Phenotypic consequences of a novel SCO2 gene mutation.

Area of Science:

• Genetics
• Molecular Biology
• Biochemistry

Background:

• Cytochrome c oxidase (COX) assembly is crucial for cellular respiration.
• Mutations in the SCO2 gene are linked to fatal infantile cardioencephalomyopathy.
• Infantile cardioencephalomyopathy presents with severe neurological and cardiac dysfunction.

Observation:

• Two siblings presented with fatal infantile cardioencephalomyopathy.
• The index patient exhibited heart failure and died at 25 days.
• Muscle biopsy revealed isolated COX-IV deficiency and hypertrophic cardiomyopathy.

Findings:

• A novel compound heterozygous mutation in the SCO2 gene (E140K and W36X) was identified.
• The mutation resulted in severe isolated COX-IV deficiency.
• Pathological findings confirmed hypertrophic cardiomyopathy in both siblings.

Implications:

• SCO2 gene mutations are a significant cause of prenatal-onset hypertrophic cardiomyopathy.
• Newborns with hypotonia and cardiomyopathy require comprehensive evaluation for mitochondrial disorders.
• Genetic testing for SCO2 mutations is vital for diagnosing and counseling families.