Genetic evidence for hybrid trait speciation in Heliconius butterflies

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dc.contributor.authorSalazar, C.
dc.contributor.authorBaxter, S.
dc.contributor.authorPardo-Diaz, C.
dc.contributor.authorWu, G.
dc.contributor.authorSurridge, A.
dc.contributor.authorLinares, M.
dc.contributor.authorBermingham, E.
dc.contributor.authorJiggins, C.
dc.contributor.editorWalsh, B.
dc.date.issued2010
dc.description.abstractHomoploid hybrid speciation is the formation of a new hybrid species without change in chromosome number. So far, there has been a lack of direct molecular evidence for hybridization generating novel traits directly involved in animal speciation. Heliconius butterflies exhibit bright aposematic color patterns that also act as cues in assortative mating. Heliconius heurippa has been proposed as a hybrid species, and its color pattern can be recreated by introgression of the H. m. melpomene red band into the genetic background of the yellow banded H. cydno cordula. This hybrid color pattern is also involved in mate choice and leads to reproductive isolation between H. heurippa and its close relatives. Here, we provide molecular evidence for adaptive introgression by sequencing genes across the Heliconius red band locus and comparing them to unlinked wing patterning genes in H. melpomene, H. cydno, and H. heurippa. 670 SNPs distributed among 29 unlinked coding genes (25,847bp) showed H. heurippa was related to H. c. cordula or the three species were intermixed. In contrast, among 344 SNPs distributed among 13 genes in the red band region (18,629bp), most showed H. heurippa related with H. c. cordula, but a block of around 6,5kb located in the 3′ of a putative kinesin gene grouped H. heurippa with H. m. melpomene, supporting the hybrid introgression hypothesis. Genealogical reconstruction showed that this introgression occurred after divergence of the parental species, perhaps around 0.43Mya. Expression of the kinesin gene is spatially restricted to the distal region of the forewing, suggesting a mechanism for pattern regulation. This gene therefore constitutes the first molecular evidence for adaptive introgression during hybrid speciation and is the first clear candidate for a Heliconius wing patterning locus.
dc.description.statementofresponsibilityCamilo Salazar, Simon W. Baxter, Carolina Pardo-Diaz, Grace Wu, Alison Surridge, Mauricio Linares, Eldredge Bermingham and Chris D. Jiggins
dc.identifier.citationPLoS Genetics, 2010; 6(4):1-12
dc.identifier.doi10.1371/journal.pgen.1000930
dc.identifier.issn1553-7390
dc.identifier.issn1553-7404
dc.identifier.orcidBaxter, S. [0000-0001-5773-6578]
dc.identifier.urihttp://hdl.handle.net/2440/76581
dc.language.isoen
dc.publisherPublic Library of Science
dc.rightsCopyright © Salazar et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
dc.source.urihttps://doi.org/10.1371/journal.pgen.1000930
dc.subjectAnimals
dc.subjectChimera
dc.subjectButterflies
dc.subjectGenetics, Population
dc.subjectGenetic Speciation
dc.subjectWings, Animal
dc.titleGenetic evidence for hybrid trait speciation in Heliconius butterflies
dc.typeJournal article
pubs.publication-statusPublished

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