Document Detail

Genomic admixture analysis in European Populus spp. reveals unexpected patterns of reproductive isolation and mating.
MedLine Citation:
PMID:  20679517     Owner:  NLM     Status:  MEDLINE    
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.
Christian Lexer; Jeffrey A Joseph; Marcela van Loo; Thelma Barbará; Berthold Heinze; Denes Bartha; Stefano Castiglione; Michael F Fay; C Alex Buerkle
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-02
Journal Detail:
Title:  Genetics     Volume:  186     ISSN:  1943-2631     ISO Abbreviation:  Genetics     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-13     Completed Date:  2011-03-21     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  0374636     Medline TA:  Genetics     Country:  United States    
Other Details:
Languages:  eng     Pagination:  699-712     Citation Subset:  IM    
University of Wyoming, Department of Botany, Laramie, WY 82071, USA.
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MeSH Terms
Adaptation, Biological / genetics*
Base Sequence
Bayes Theorem
Biological Evolution*
Chromosome Mapping
Crosses, Genetic
Data Interpretation, Statistical
Epistasis, Genetic
Genetic Drift
Genetic Linkage
Genetic Markers
Genetic Speciation
Genetic Variation
Hybridization, Genetic*
Polymorphism, Genetic
Populus / genetics*,  physiology*
Reproduction / genetics
Sequence Analysis, DNA
Reg. No./Substance:
0/Genetic Markers

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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