Apr 11, 2020

Selection and gene flow define polygenic barriers between incipient butterfly species

BioRxiv : the Preprint Server for Biology
Steven M Van BelleghemBrian A Counterman

Abstract

Characterizing the genetic architecture of species boundaries remains a difficult task. Hybridizing species provide a powerful system to identify the factors that shape genomic variation and, ultimately, identify the regions of the genome that maintain species boundaries. Unfortunately, complex histories of isolation, admixture and selection can generate heterogenous genomic landscapes of divergence which make inferences about the regions that are responsible for species boundaries problematic. However, as the signal of admixture and selection on genomic loci varies with recombination rate, their relationship can be used to infer their relative importance during speciation. Here, we explore patterns of genomic divergence, admixture and recombination rate among hybridizing lineages across the Heliconius erato radiation. We focus on the incipient species, H. erato and H. himera, and distinguish the processes that drive genomic divergence across three contact zones where they frequently hybridize. Using demographic modeling and simulations, we infer that periods of isolation and selection have been major causes of genome-wide correlation patterns between recombination rate and divergence between these incipient species. Upon secon...Continue Reading

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Mentioned in this Paper

In Vivo
Exploration With a Probe
C-reactive Protein Measurement
Primer Extension
RNA Folding
Hydroxyl group
Sequencing
Massively-Parallel Sequencing
Nucleotides
Structure

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