Abstract
Above all other elements, molecules, and compounds, O2 is the critical environmental substrate that must be delivered to all cells of metazoan organisms on a virtually continuous basis for survival. The evolution of multicellular animals in which oxygen could no longer be acquired by all cells via simple diffusion necessitated the co-evolution of physiological systems specialized for O2 delivery, which became progressively more complex as body size increased, most notably with the appearance of the vertebrates. The HIF-1 (hypoxia-inducible factor 1) family of bHLH-PAS transcription factors appears to have evolved as a specialized system for regulating oxygen homeostasis at the level of gene expression in metazoans. HIF-1 is present in simple invertebrates such as the roundworm Caenorhabditis elegans, which consists of ~103 cells and relies on simple diffusion for O2 transport, more complex invertebrates such as the fruit fly Drosophila melanogaster, in which O2 is distributed through the body via a set of specialized tracheal tubes, and in complex vertebrates such as Homo sapiens, which consist of > 1013 cells that are supplied with O2 via the combined functioning of highly complex and specialized circulatory and respiratory systems.
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Semenza, G.L. (2003). The HIF-1 Family of bHLH-PAS Proteins: Master Regulators of Oxygen Homeostasis. In: Crews, S.T. (eds) PAS Proteins: Regulators and Sensors of Development and Physiology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0515-0_8
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