Encephalopathy due to defective mitochondrial and peroxisomal fission (EMPF) is a very rare lethal disorder characterized by cerebral dysgenesis, hypotonia, seizures, lactic acidosis, elevated very long chain fatty acids, and abnormally elongated mitochondria and peroxisomes. It has been described that patients have mutations in DNM1L gene, which has a critical role in regulating the fission of both mitochondria and peroxisomes. Recently, it has been reported that mutations in mitochondrial fission factor (MFF) also cause Leigh-like encephalopathy, optic atrophy and peripheral neuropathy.
