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Adrenal Insufficiency in Mitochondrial Disease

GFER-related mitochondrial encephalomyopathy has been previously described only in 3 siblings of a consanguineous Moroccan family. Their phenotype included congenital cataracts, hypotonia, developmental delay, and sensorineural hearing loss. Multiple mitochondrial respiratory chain complex deficiencies were identified on muscle biopsy. We describe a now-19-year-old woman with adrenal insufficiency, lactic acidosis, congenital cataracts, and respiratory insufficiency secondary to mitochondrial disorder, who was reported by North et al (1996) as a toddler. Compound heterozygous GFER mutations c.373C>T (Q125X) and c.581G>A (R194 H) were recently discovered in this patient. The purpose of this report is (1) to expand the phenotype this ultra-rare disorder and (2) to provide a review of the literature describing the unique finding of adrenal insufficiency in patients with molecularly confirmed disorders of mitochondrial metabolism.