Abstract
Relative to other vertebrates, birds have unusually high blood glucose levels. In humans, the hyperglycemia observed in birds would be associated with diabetes mellitus and the non-enzymatic glycation of proteins, which leads to the accumulation of advanced glycation products and to a plethora of microvascular pathologies. How do birds avoid the negative effects of hyperglycemia? Anthony-Regnitz et al. (J Mol Evol 88: 653–661, 2020) discovered that birds might have evolved glycation-resistant proteins. Serum albumin is an important multifunctional protein susceptible to glycation. Anthony-Regnitz et al. (J Mol Evol 88: 653–661, 2020) found that chicken albumin is resistant to glycation relative to bovine serum albumin. Protein glycation takes place primarily in lysine residues, which are less abundant in chicken than in bovine serum albumin. A multispecies comparison of serum albumin sequences revealed lower numbers of lysine residues in birds than in mammals. Benign hyperglycemia is a shared derived trait of birds and glycation resistance mechanisms appear to have accompanied its evolution. The evolution of benign hyperglycemia in birds coincided with a genomic upheaval that included the loss of important genes, including the one that codes for GLUT4, the transporter responsible for insulin-dependent glucose transport in other vertebrates’ insulin-sensitive cells. This loss seems to have resulted in the remodeling of the insulin-signaling pathway in bird tissues. Avian hyperglycemia has been considered a mystery for a long time. Although we remain ignorant of its origins and its repercussions for the physiology of birds, the discovery of resistance to glycation in bird serum albumin offers a path forward to solve this mystery.
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Yocelyn T. Gutiérrez-Guerrero (CONACyT, Mexico, Grant No. 580116).
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Martinez del Rio, C., Gutiérrez-Guerrero, Y.T. An Evolutionary Remedy for an Abominable Physiological Mystery: Benign Hyperglycemia in Birds. J Mol Evol 88, 715–719 (2020). https://doi.org/10.1007/s00239-020-09970-0
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DOI: https://doi.org/10.1007/s00239-020-09970-0