Document Detail

Genomic diversity, population structure, and migration following rapid range expansion in the Balsam poplar, Populus balsamifera.
MedLine Citation:
PMID:  20163548     Owner:  NLM     Status:  MEDLINE    
Rapid range expansions can cause pervasive changes in the genetic diversity and structure of populations. The postglacial history of the Balsam Poplar, Populus balsamifera, involved the colonization of most of northern North America, an area largely covered by continental ice sheets during the last glacial maximum. To characterize how this expansion shaped genomic diversity within and among populations, we developed 412 SNP markers that we assayed for a range-wide sample of 474 individuals sampled from 34 populations. We complemented the SNP data set with DNA sequence data from 11 nuclear loci from 94 individuals, and used coalescent analyses to estimate historical population size, demographic growth, and patterns of migration. Bayesian clustering identified three geographically separated demes found in the Northern, Central, and Eastern portions of the species' range. These demes varied significantly in nucleotide diversity, the abundance of private polymorphisms, and population substructure. Most measures supported the Central deme as descended from the primary refuge of diversity. Both SNPs and sequence data suggested recent population growth, and coalescent analyses of historical migration suggested a massive expansion from the Centre to the North and East. Collectively, these data demonstrate the strong influence that range expansions exert on genomic diversity, both within local populations and across the range. Our results suggest that an in-depth knowledge of nucleotide diversity following expansion requires sampling within multiple populations, and highlight the utility of combining insights from different data types in population genomic studies.
Stephen R Keller; Matthew S Olson; Salim Silim; William Schroeder; Peter Tiffin
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-02-15
Journal Detail:
Title:  Molecular ecology     Volume:  19     ISSN:  1365-294X     ISO Abbreviation:  Mol. Ecol.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-05-11     Completed Date:  2010-06-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9214478     Medline TA:  Mol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1212-26     Citation Subset:  IM    
Department of Plant Biology, University of Minnesota, St. Paul, MN 55108, USA.
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MeSH Terms
Bayes Theorem
Cluster Analysis
DNA, Plant / genetics
Evolution, Molecular
Genetic Variation*
Genetics, Population*
Genome, Plant*
Models, Genetic
North America
Polymorphism, Single Nucleotide
Populus / genetics*
Sequence Analysis, DNA
Reg. No./Substance:
0/DNA, Plant
Comment In:
Mol Ecol. 2010 Mar;19(6):1075-8   [PMID:  20456223 ]

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

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