DEFINING A NOVEL ROLE FOR HYPOXIA INDUCIBLE FACTOR-2 ALPHA (HIF-2α)/EPAS1: MAINTENANCE OF MITOCHONDRIAL AND REDOX HOMEOSTASIS APPROVED BY SUPERVISORY COMMITTEE: Joseph A. Garcia, M.D., Ph.D. Joyce Repa, Ph.D. Victoria Esser, Ph.D. Daniel Garry, M.D., Ph.D. Steven Kliewer, Ph.D.