Dec 28, 2011

Genomic islands of divergence in hybridizing Heliconius butterflies identified by large-scale targeted sequencing

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Nicola J NadeauC D Jiggins

Abstract

Heliconius butterflies represent a recent radiation of species, in which wing pattern divergence has been implicated in speciation. Several loci that control wing pattern phenotypes have been mapped and two were identified through sequencing. These same gene regions play a role in adaptation across the whole Heliconius radiation. Previous studies of population genetic patterns at these regions have sequenced small amplicons. Here, we use targeted next-generation sequence capture to survey patterns of divergence across these entire regions in divergent geographical races and species of Heliconius. This technique was successful both within and between species for obtaining high coverage of almost all coding regions and sufficient coverage of non-coding regions to perform population genetic analyses. We find major peaks of elevated population differentiation between races across hybrid zones, which indicate regions under strong divergent selection. These 'islands' of divergence appear to be more extensive between closely related species, but there is less clear evidence for such islands between more distantly related species at two further points along the 'speciation continuum'. We also sequence fosmid clones across these regions...Continue Reading

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  • Citations161

References

Mentioned in this Paper

Genes, Insect
Study
Geographic
Zone
Patterns
FP884226
FP700056
Genes
Divergence
FP885842

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