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Proc Natl Acad Sci U S A

Title:		Divergence of chemosensing during the early stages of speciation
Author(s):		van Schooten B; Melendez-Rosa J; Van Belleghem SM; Jiggins CD; Tan JD; McMillan WO; Papa R;
Address:		"Department of Biology, University of Puerto Rico, Rio Piedras, San Juan, Puerto Rico 00925; basvanschooten@gmail.com jesykamelendez@gmail.com rpapa.lab@gmail.com. Smithsonian Tropical Research Institution, Balboa Ancon, 0843-03092 Panama, Republic of Panama. Department of Biology, University of Puerto Rico, Rio Piedras, San Juan, Puerto Rico 00925. Department of Zoology, University of Cambridge, CB2 8PQ Cambridge, United Kingdom. Roche NimbleGen Inc., Madison, WI 53719. Molecular Sciences and Research Center, University of Puerto Rico, San Juan, Puerto Rico 00907"
Journal Title:		Proc Natl Acad Sci U S A
Year:		2020
Volume:		20200629
Issue:		28
Page Number:		16438 - 16447
DOI:		10.1073/pnas.1921318117
ISSN/ISBN:		1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking)
Abstract:		"Chemosensory communication is essential to insect biology, playing indispensable roles during mate-finding, foraging, and oviposition behaviors. These traits are particularly important during speciation, where chemical perception may serve to establish species barriers. However, identifying genes associated with such complex behavioral traits remains a significant challenge. Through a combination of transcriptomic and genomic approaches, we characterize the genetic architecture of chemoperception and the role of chemosensing during speciation for a young species pair of Heliconius butterflies, Heliconius melpomene and Heliconius cydno We provide a detailed description of chemosensory gene-expression profiles as they relate to sensory tissue (antennae, legs, and mouthparts), sex (male and female), and life stage (unmated and mated female butterflies). Our results untangle the potential role of chemical communication in establishing barriers during speciation and identify strong candidate genes for mate and host plant choice behaviors. Of the 252 chemosensory genes, HmOBP20 (involved in volatile detection) and HmGr56 (a putative synephrine-related receptor) emerge as strong candidates for divergence in pheromone detection and host plant discrimination, respectively. These two genes are not physically linked to wing-color pattern loci or other genomic regions associated with visual mate preference. Altogether, our results provide evidence for chemosensory divergence between H. melpomene and H. cydno, two rarely hybridizing butterflies with distinct mate and host plant preferences, a finding that supports a polygenic architecture of species boundaries"
Keywords:		"Animals Butterflies/classification/*genetics/physiology Chemotaxis *Evolution, Molecular Female *Genetic Speciation Insect Proteins/*genetics/metabolism Male Phenotype Sensation Lepidoptera butterfly smell speciation taste;"
Notes:		"Medlinevan Schooten, Bas Melendez-Rosa, Jesyka Van Belleghem, Steven M Jiggins, Chris D Tan, John D McMillan, W Owen Papa, Riccardo eng P20 GM103475/GM/NIGMS NIH HHS/ Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2020/07/01 Proc Natl Acad Sci U S A. 2020 Jul 14; 117(28):16438-16447. doi: 10.1073/pnas.1921318117. Epub 2020 Jun 29"