Large Mitochondrial DNA Deletion in an Infant with Addison Disease
Abstract
Background: Mitochondrial diseases are a group of disorders caused by mutations in nuclear DNA or mitochondrial DNA, usually involving multiple organ systems. Primary adrenal insufficiency due to mitochondrial disease is extremely infrequent and has been reported in association with mitochondrial DNA deletion syndromes such as Kearns–Sayre syndrome.
Aim: To report a 3-year-old boy with Addison disease, congenital glaucoma, chronic pancreatitis, and mitochondrial myopathy due to large mitochondrial DNA deletion.
Method: Molecular analysis of mitochondrial DNA samples obtained from peripheral blood, oral mucosa, and muscle tissue.
Results: A novel large mitochondrial DNA deletion of 7,372bp was identified involving almost all genes on the big arch of mtDNA.
Conclusions: This case reaffirms the association of adrenal insufficiency and mitochondrial DNA deletions and presents new evidence that glaucoma is another manifestation of mitochondrial diseases. Due to the genetic and clinical heterogeneity of mitochondrial disorders, molecular analysis is crucial to confirm diagnosis and to allow accurate genetic counseling.
Keywords
Chronic Pancreatitis Mitochondrial Disease Mitochondrial Myopathy Progressive External Ophthalmoplegia Congenital GlaucomaNotes
Acknowledgments
This work was supported by a grant from the Departamento de Laboratorios Clínicos de la Pontificia Universidad Católica de Chile.
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