Evolution of sweet taste perception in hummingbirds by transformation of the ancestral umami receptor

Author:

Baldwin Maude W.1,Toda Yasuka2,Nakagita Tomoya2,O'Connell Mary J.3,Klasing Kirk C.4,Misaka Takumi2,Edwards Scott V.1,Liberles Stephen D.5

Affiliation:

1. Department of Organismic and Evolutionary Biology, Harvard University, and Museum of Comparative Zoology, Cambridge, MA 02138, USA.

2. Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, Japan.

3. Bioinformatics and Molecular Evolution Group, School of Biotechnology, Dublin City University, Glasnevin, Dublin 9, Ireland.

4. Department of Animal Science, University of California, Davis, Davis, CA 95616, USA.

5. Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Abstract

The makings of a powerful sweet tooth The main attraction of nectar, a hummingbird favorite, is the sweet taste of sugar. Oddly, though, birds lack the main vertebrate receptor for sweet taste, TIR2. Baldwin et al. show that a related receptor, TIR1-T1R3, which generally controls savory taste in vertebrates, adapts in hummingbirds to detect sweet (see the Perspective by Jiang and Beauchamp). This repurposing probably allowed hummingbirds to specialize in nectar feeding and may have assisted the evolution of the many and varied hummingbird species seen today. Science , this issue p. 929 ; see also p. 878

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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