Hypoxia research, where to now?

Research into oxygen sensing and response has been impactful in physiology and pathology. New functions for hypoxia-inducible factor (HIF) transcription factors are emerging. The 2-oxoglutarate-dependent dioxygenase (2-OGDD) family is vast, but knowledge regarding its family members is still emerging. New tools and methods need to be developed to quantify and visualize O 2 levels in cells, organs, and organisms. Investigating how cells and organisms sense and respond to O 2 levels is essential to our understanding of physiology and pathology. This field has advanced considerably since the discovery of the major transcription factor family, hypoxia-inducible factor (HIF), and the enzymes that control its levels: prolyl hydroxylases (PHDs). However, with its expansion, new complexities have emerged. Herein we highlight three main areas where, in our opinion, the research community could direct some of their attention. These include non-transcriptional roles of HIFs, specificity and O 2 sensitivity of 2-oxoglutarate-dependent dioxygenases (2-OGDDs), and new tools and methods to detect O 2 concentrations in cells and organs. A greater understanding of these areas would answer big questions and help drive our knowledge of cellular responses to hypoxia forward. [ABSTRACT FROM AUTHOR]