Genomic admixture analysis in European Populus spp. reveals unexpected patterns of reproductive isolation and mating

Admixture between genetically divergent populations facilitates genomic studies of the mechanisms involved in adaptation, reproductive isolation, and speciation, including mapping of the loci involved in these phenomena. Little is known about how pre- and postzygotic barriers will affect the prospec...

Full description

Saved in:
Bibliographic Details
Published in:Genetics (Austin) 2010-10, Vol.186 (2), p.699-712
Main Authors: Lexer, Christian, Joseph, Jeffrey A, van Loo, Marcela, Barbará, Thelma, Heinze, Berthold, Bartha, Denes, Castiglione, Stefano, Fay, Michael F, Buerkle, C Alex
Format: Article
Language:English
Subjects:
Adaptation, Biological - genetics
Alleles
Base Sequence
Bayes Theorem
Biological Evolution
Chromosome Mapping
Crosses, Genetic
Data Interpretation, Statistical
Epistasis, Genetic
Evolutionary biology
Genetic Drift
Genetic Linkage
Genetic Markers
Genetic Speciation
Genetic Variation
Genetics
Genomics
Genotype
Hybridization, Genetic
Investigations
Polymorphism, Genetic
Populus - genetics
Populus - physiology
Reproduction - genetics
Sequence Analysis, DNA
Studies
Trees
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Admixture between genetically divergent populations facilitates genomic studies of the mechanisms involved in adaptation, reproductive isolation, and speciation, including mapping of the loci involved in these phenomena. Little is known about how pre- and postzygotic barriers will affect the prospects of "admixture mapping" in wild species. We have studied 93 mapped genetic markers (microsatellites, indels, and sequence polymorphisms, ∼60,000 data points) to address this topic in hybrid zones of Populus alba and P. tremula, two widespread, ecologically important forest trees. Using genotype and linkage information and recently developed analytical tools we show that (1) reproductive isolation between these species is much stronger than previously assumed but this cannot prevent the introgression of neutral or advantageous alleles, (2) unexpected genotypic gaps exist between recombinant hybrids and their parental taxa, (3) these conspicuous genotypic patterns are due to assortative mating and strong postzygotic barriers, rather than recent population history. We discuss possible evolutionary trajectories of hybrid lineages between these species and outline strategies for admixture mapping in hybrid zones between highly divergent populations. Datasets such as this one are still rare in studies of natural hybrid zones but should soon become more common as high throughput genotyping and resequencing become feasible in nonmodel species.
ISSN:1943-2631
0016-6731
1943-2631
DOI:10.1534/genetics.110.118828