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Firefly Genomes Illuminate Parallel Origins of Bioluminescence in Beetles

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Firefly Genomes Illuminate Parallel Origins of Bioluminescence in Beetles Firefly genomes illuminate parallel origins of bioluminescence in beetles The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Fallon, Timothy R. et al. "Firefly genomes illuminate parallel origins of bioluminescence in beetles." eLife 7 (2018): e36495 © 2019 The Author(s) As Published 10.7554/elife.36495 Publisher eLife Sciences Publications, Ltd Version Final published version Citable link https://hdl.handle.net/1721.1/124645 Terms of Use Creative Commons Attribution 4.0 International license Detailed Terms https://creativecommons.org/licenses/by/4.0/ RESEARCH ARTICLE Firefly genomes illuminate parallel origins of bioluminescence in beetles Timothy R Fallon1,2†, Sarah E Lower3,4†, Ching-Ho Chang5, Manabu Bessho-Uehara6,7,8, Gavin J Martin9, Adam J Bewick10, Megan Behringer11, Humberto J Debat12, Isaac Wong5, John C Day13, Anton Suvorov9, Christian J Silva5,14, Kathrin F Stanger-Hall15, David W Hall10, Robert J Schmitz10, David R Nelson16, Sara M Lewis17, Shuji Shigenobu18, Seth M Bybee9, Amanda M Larracuente5, Yuichi Oba6, Jing-Ke Weng1,2* 1Whitehead Institute for Biomedical Research, Cambridge, United States; 2Department of Biology, Massachusetts Institute of Technology, Cambridge, United States; 3Department of Molecular Biology and Genetics, Cornell University, Ithaca, United States; 4Department of Biology, Bucknell University, Lewisburg, United States; 5Department of Biology, University of Rochester, Rochester, United States; 6Department of Environmental Biology, Chubu University, Kasugai, Japan; 7Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan; 8Monterey Bay Aquarium Research Institute, Moss Landing, United States; 9Department of Biology, Brigham Young University, Provo, United States; 10Department of Genetics, University of Georgia, Athens, United States; 11Biodesign Center for Mechanisms of Evolution, Arizona State University, Tempe, United States; 12Center of Agronomic Research, National Institute of Agricultural Technology, Co´rdoba, Argentina; 13Centre for Ecology and Hydrology (CEH), Wallingford, United Kingdom; 14Department of Plant Sciences, University of California Davis, Davis, United States; 15Department of Plant Biology, University of 16 *For correspondence: Georgia, Athens, United States; Department of Microbiology Immunology and [email protected] Biochemistry, University of Tennessee HSC, Memphis, United States; 17Department 18 †These authors contributed of Biology, Tufts University, Medford, United States; NIBB Core Research equally to this work Facilities, National Institute for Basic Biology, Okazaki, Japan Competing interests: The authors declare that no competing interests exist. Abstract Fireflies and their luminous courtships have inspired centuries of scientific study. Today Funding: See page 16 firefly luciferase is widely used in biotechnology, but the evolutionary origin of bioluminescence Received: 08 March 2018 within beetles remains unclear. To shed light on this long-standing question, we sequenced the Accepted: 23 August 2018 genomes of two firefly species that diverged over 100 million-years-ago: the North American Published: 16 October 2018 Photinus pyralis and Japanese Aquatica lateralis. To compare bioluminescent origins, we also sequenced the genome of a related click beetle, the Caribbean Ignelater luminosus, with Reviewing editor: Robert Waterhouse, Universite´ bioluminescent biochemistry near-identical to fireflies, but anatomically unique light organs, Lausanne, Switzerland suggesting the intriguing hypothesis of parallel gains of bioluminescence. Our analyses support independent gains of bioluminescence in fireflies and click beetles, and provide new insights into Copyright Fallon et al. This the genes, chemical defenses, and symbionts that evolved alongside their luminous lifestyle. article is distributed under the DOI: https://doi.org/10.7554/eLife.36495.001 terms of the Creative Commons Attribution License, which permits unrestricted use and redistribution provided that the original author and source are credited. Fallon et al. eLife 2018;7:e36495. DOI: https://doi.org/10.7554/eLife.36495 1 of 146 Research article Genetics and Genomics eLife digest Glowing fireflies dancing in the dark are one of the most enchanting sights of a warm summer night. Their light signals are ‘love messages’ that help the insects find a mate – yet, they also warn a potential predator that these beetles have powerful chemical defenses. The light comes from a specialized organ of the firefly where a small molecule, luciferin, is broken down by the enzyme luciferase. Fireflies are an ancient group, with the common ancestor of the two main lineages originating over 100 million years ago. But fireflies are not the only insects that produce light: certain click beetles are also bioluminescent. Fireflies and click beetles are closely related, and they both use identical luciferin and similar luciferases to create light. This would suggest that bioluminescence was already present in the common ancestor of the two families. However, the specialized organs in which the chemical reactions take place are entirely different, which would indicate that the ability to produce light arose independently in each group. Here, Fallon, Lower et al. try to resolve this discrepancy and to find out how many times bioluminescence evolved in beetles. This required using cutting-edge DNA sequencing to carefully piece together the genomes of two species of fireflies (Photinus pyralis and Aquatica lateralis) and one species of click beetle (Ignelater luminosus). The genetic analysis revealed that, in all species, the genes for luciferases were very similar to the genetic sequences around them, which code for proteins that break down fat. This indicates that the ancestral luciferase arose from one of these metabolic genes getting duplicated, and then one of the copies evolving a new role. However, the genes for luciferase were very different between the fireflies and the click beetles. Further analyses suggested that bioluminescence evolved at least twice: once in an ancestor of fireflies, and once in the ancestor of the bioluminescent click beetles. More results came from the reconstituted genomes. For example, Fallon, Lower et al. identified the genes ‘turned on’ in the bioluminescent organ of the fireflies. This made it possible to list genes that may be involved in creating luciferin, and enable flies to grow brightly for long periods. In addition, the genetic information yielded sequences from bacteria that likely live inside firefly cells, and which may participate in the light-making process or the production of potent chemical defenses. Better genetic knowledge of beetle bioluminescence could bring new advances for both insects and humans. It may help researchers find and design better light-emitting molecules useful to track and quantify proteins of interest in a cell. Ultimately, it would allow a detailed understanding of firefly populations around the world, which could contribute to firefly ecotourism and help to protect these glowing insects from increasing environmental threats. DOI: https://doi.org/10.7554/eLife.36495.002 Introduction Fireflies (Coleoptera: Lampyridae) represent the best-studied case of bioluminescence. The coded language of their luminous courtship displays (Figure 1A; Video 1) has been long studied for its role in mate recognition (Lloyd, 1966; Lewis and Cratsley, 2008; Stanger-Hall and Lloyd, 2015), while non-adult bioluminescence is likely a warning signal of their unpalatable chemical defenses (De Cock and Matthysen, 1999), such as the cardiotoxic lucibufagins of Photinus fireflies (Meinwald et al., 2+ 1979). The biochemical understanding of firefly luminescence: an ATP, Mg , and O2-dependent luciferase-mediated oxidation of the substrate luciferin (Shimomura, 2012), along with the cloning of the luciferase gene (de Wet et al., 1985; Ow et al., 1986), led to the widespread use of lucifer- ase as a reporter with unique applications in biomedical research and industry (Fraga, 2008). With >2000 species globally, fireflies are undoubtedly the most culturally appreciated bioluminescent group, yet there are at least three other beetle families with bioluminescent species: click beetles (Elateridae), American railroad worms (Phengodidae) and Asian starworms (Rhagophthalmidae) (Martin et al., 2017). These four closely related families (superfamily Elateroidea) have homologous luciferases and structurally identical luciferins (Shimomura, 2012), implying a single origin of beetle bioluminescence. However, as Darwin recognized in his ‘Difficulties on Theory’ (Darwin, 1872), the Fallon et al. eLife 2018;7:e36495. DOI: https://doi.org/10.7554/eLife.36495 2 of 146 Research article Genetics and Genomics A B D. melanogaster Tribolium castaneum Ignelater luminosus 327 Mya Elateridae Agrypninae 206 Mya Coleoptera Insecta 115 Mya C Aquatica lateralis Luciolinae Lampyridae 105 Lampyridae MMNJ Mya Photinus pyralis Lampyrinae GSMNP 5 mm Family OrderClass Subfamily Figure 1. Geographic and phylogenetic context of the Big Dipper firefly, Photinus pyralis.(A) P. pyralis males emitting their characteristic swooping ‘J’ patrol flashes over a field in Homer Lake, Illinois. Females cue in on these species-specific flash patterns and respond with their own species-specific flash (Lloyd, 1966). Photo credit: Alex Wild. Inset: male and female P. pyralis in early stages of mating. Photo credit: Terry Priest. (B) Cladogram
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