EPAS1

EPAS1 or Endothelial PAS domain-containing protein 1 is a protein that in humans is encoded by the EPAS1 gene. This protein is also commonly known as Hypoxia-inducible factor 2 alpha (HIF-2α). It is a transcription factor involved in the body's response to low oxygen levels, or hypoxia.

Function

EPAS1 is a member of the PAS domain family of transcription factors. It is involved in the induction of genes regulated by oxygen, which is induced as oxygen levels fall. The encoded protein contains a basic-helix-loop-helix domain protein dimerization domain as well as a domain found in proteins in signal transduction pathways which respond to oxygen levels.

EPAS1 plays an essential role in embryonic vascularization, tumor angiogenesis and pathophysiology of ischemic disease. It also plays a role in the regulation of oxygen homeostasis, and is involved in the adaptive response to hypoxic stress in the heart, lung and other tissues.

Clinical significance

Mutations in the EPAS1 gene have been associated with Erythrocytosis, a condition characterized by an excessive production of red blood cells. In addition, EPAS1 mutations have been implicated in certain types of cancer, including renal cell carcinoma and glioblastoma multiforme, where they contribute to the growth and survival of tumor cells in low-oxygen environments.

Research

Research into the role of EPAS1 in disease is ongoing. It is thought that understanding the function of this gene could lead to new treatments for conditions such as cancer and ischemic diseases.

See also

• Hypoxia-inducible factors
• PAS domain
• Erythrocytosis
• Renal cell carcinoma
• Glioblastoma multiforme