Project description:The human HIF3A gene undergoes extensive alternative splicing resulting in seven known isoforms. The short splice variant, HIF-3alpha4, is an inhibitor of the hypoxia response driven by HIF-1 and HIF-2. The role of the long isoforms remains unclear. We used cDNA microarray to study the overall impact of HIF-3a2 overexpression in Hep3B cells under 1 % hypoxia.