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Genome resequencing reveals multiscale geographic structure and extensive linkage disequilibrium in the forest tree Populus trichocarpa.

Identifieur interne : 002A67 ( Main/Exploration ); précédent : 002A66; suivant : 002A68

Genome resequencing reveals multiscale geographic structure and extensive linkage disequilibrium in the forest tree Populus trichocarpa.

Auteurs : Gancho T. Slavov [États-Unis] ; Stephen P. Difazio ; Joel Martin ; Wendy Schackwitz ; Wellington Muchero ; Eli Rodgers-Melnick ; Mindie F. Lipphardt ; Christa P. Pennacchio ; Uffe Hellsten ; Len A. Pennacchio ; Lee E. Gunter ; Priya Ranjan ; Kelly Vining ; Kyle R. Pomraning ; Larry J. Wilhelm ; Matteo Pellegrini ; Todd C. Mockler ; Michael Freitag ; Armando Geraldes ; Yousry A. El-Kassaby ; Shawn D. Mansfield ; Quentin C B. Cronk ; Carl J. Douglas ; Steven H. Strauss ; Dan Rokhsar ; Gerald A. Tuskan

Source :

RBID : pubmed:22861491

Descripteurs français

English descriptors

Abstract

• Plant population genomics informs evolutionary biology, breeding, conservation and bioenergy feedstock development. For example, the detection of reliable phenotype-genotype associations and molecular signatures of selection requires a detailed knowledge about genome-wide patterns of allele frequency variation, linkage disequilibrium and recombination. • We resequenced 16 genomes of the model tree Populus trichocarpa and genotyped 120 trees from 10 subpopulations using 29,213 single-nucleotide polymorphisms. • Significant geographic differentiation was present at multiple spatial scales, and range-wide latitudinal allele frequency gradients were strikingly common across the genome. The decay of linkage disequilibrium with physical distance was slower than expected from previous studies in Populus, with r(2) dropping below 0.2 within 3-6 kb. Consistent with this, estimates of recent effective population size from linkage disequilibrium (N(e) ≈ 4000-6000) were remarkably low relative to the large census sizes of P. trichocarpa stands. Fine-scale rates of recombination varied widely across the genome, but were largely predictable on the basis of DNA sequence and methylation features. • Our results suggest that genetic drift has played a significant role in the recent evolutionary history of P. trichocarpa. Most importantly, the extensive linkage disequilibrium detected suggests that genome-wide association studies and genomic selection in undomesticated populations may be more feasible in Populus than previously assumed.

DOI: 10.1111/j.1469-8137.2012.04258.x
PubMed: 22861491


Affiliations:


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Le document en format XML

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<term>DNA Methylation (MeSH)</term>
<term>DNA, Plant (genetics)</term>
<term>Evolution, Molecular (MeSH)</term>
<term>Gene Frequency (MeSH)</term>
<term>Genetic Association Studies (methods)</term>
<term>Genetic Drift (MeSH)</term>
<term>Genome, Plant (MeSH)</term>
<term>Genomics (methods)</term>
<term>Genotyping Techniques (MeSH)</term>
<term>Geography (MeSH)</term>
<term>Linkage Disequilibrium (MeSH)</term>
<term>Polymorphism, Single Nucleotide (MeSH)</term>
<term>Populus (genetics)</term>
<term>Principal Component Analysis (MeSH)</term>
<term>Recombination, Genetic (MeSH)</term>
<term>Selection, Genetic (MeSH)</term>
<term>Sensitivity and Specificity (MeSH)</term>
<term>Sequence Analysis, DNA (methods)</term>
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<term>ADN des plantes (génétique)</term>
<term>Analyse de séquence d'ADN (méthodes)</term>
<term>Analyse en composantes principales (MeSH)</term>
<term>Dérive génétique (MeSH)</term>
<term>Déséquilibre de liaison (MeSH)</term>
<term>Fréquence d'allèle (MeSH)</term>
<term>Génome végétal (MeSH)</term>
<term>Génomique (méthodes)</term>
<term>Géographie (MeSH)</term>
<term>Méthylation de l'ADN (MeSH)</term>
<term>Polymorphisme de nucléotide simple (MeSH)</term>
<term>Populus (génétique)</term>
<term>Recombinaison génétique (MeSH)</term>
<term>Sensibilité et spécificité (MeSH)</term>
<term>Sélection génétique (MeSH)</term>
<term>Techniques de génotypage (MeSH)</term>
<term>Études d'associations génétiques (méthodes)</term>
<term>Évolution moléculaire (MeSH)</term>
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<term>DNA, Plant</term>
</keywords>
<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="génétique" xml:lang="fr">
<term>ADN des plantes</term>
<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="methods" xml:lang="en">
<term>Genetic Association Studies</term>
<term>Genomics</term>
<term>Sequence Analysis, DNA</term>
</keywords>
<keywords scheme="MESH" qualifier="méthodes" xml:lang="fr">
<term>Analyse de séquence d'ADN</term>
<term>Génomique</term>
<term>Études d'associations génétiques</term>
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<keywords scheme="MESH" xml:lang="en">
<term>DNA Methylation</term>
<term>Evolution, Molecular</term>
<term>Gene Frequency</term>
<term>Genetic Drift</term>
<term>Genome, Plant</term>
<term>Genotyping Techniques</term>
<term>Geography</term>
<term>Linkage Disequilibrium</term>
<term>Polymorphism, Single Nucleotide</term>
<term>Principal Component Analysis</term>
<term>Recombination, Genetic</term>
<term>Selection, Genetic</term>
<term>Sensitivity and Specificity</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr">
<term>Analyse en composantes principales</term>
<term>Dérive génétique</term>
<term>Déséquilibre de liaison</term>
<term>Fréquence d'allèle</term>
<term>Génome végétal</term>
<term>Géographie</term>
<term>Méthylation de l'ADN</term>
<term>Polymorphisme de nucléotide simple</term>
<term>Recombinaison génétique</term>
<term>Sensibilité et spécificité</term>
<term>Sélection génétique</term>
<term>Techniques de génotypage</term>
<term>Évolution moléculaire</term>
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<div type="abstract" xml:lang="en">• Plant population genomics informs evolutionary biology, breeding, conservation and bioenergy feedstock development. For example, the detection of reliable phenotype-genotype associations and molecular signatures of selection requires a detailed knowledge about genome-wide patterns of allele frequency variation, linkage disequilibrium and recombination. • We resequenced 16 genomes of the model tree Populus trichocarpa and genotyped 120 trees from 10 subpopulations using 29,213 single-nucleotide polymorphisms. • Significant geographic differentiation was present at multiple spatial scales, and range-wide latitudinal allele frequency gradients were strikingly common across the genome. The decay of linkage disequilibrium with physical distance was slower than expected from previous studies in Populus, with r(2) dropping below 0.2 within 3-6 kb. Consistent with this, estimates of recent effective population size from linkage disequilibrium (N(e) ≈ 4000-6000) were remarkably low relative to the large census sizes of P. trichocarpa stands. Fine-scale rates of recombination varied widely across the genome, but were largely predictable on the basis of DNA sequence and methylation features. • Our results suggest that genetic drift has played a significant role in the recent evolutionary history of P. trichocarpa. Most importantly, the extensive linkage disequilibrium detected suggests that genome-wide association studies and genomic selection in undomesticated populations may be more feasible in Populus than previously assumed.</div>
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<AbstractText>• Plant population genomics informs evolutionary biology, breeding, conservation and bioenergy feedstock development. For example, the detection of reliable phenotype-genotype associations and molecular signatures of selection requires a detailed knowledge about genome-wide patterns of allele frequency variation, linkage disequilibrium and recombination. • We resequenced 16 genomes of the model tree Populus trichocarpa and genotyped 120 trees from 10 subpopulations using 29,213 single-nucleotide polymorphisms. • Significant geographic differentiation was present at multiple spatial scales, and range-wide latitudinal allele frequency gradients were strikingly common across the genome. The decay of linkage disequilibrium with physical distance was slower than expected from previous studies in Populus, with r(2) dropping below 0.2 within 3-6 kb. Consistent with this, estimates of recent effective population size from linkage disequilibrium (N(e) ≈ 4000-6000) were remarkably low relative to the large census sizes of P. trichocarpa stands. Fine-scale rates of recombination varied widely across the genome, but were largely predictable on the basis of DNA sequence and methylation features. • Our results suggest that genetic drift has played a significant role in the recent evolutionary history of P. trichocarpa. Most importantly, the extensive linkage disequilibrium detected suggests that genome-wide association studies and genomic selection in undomesticated populations may be more feasible in Populus than previously assumed.</AbstractText>
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<ForeName>Quentin C B</ForeName>
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<Initials>D</Initials>
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<Country>England</Country>
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<name sortKey="Strauss, Steven H" sort="Strauss, Steven H" uniqKey="Strauss S" first="Steven H" last="Strauss">Steven H. Strauss</name>
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<name sortKey="Vining, Kelly" sort="Vining, Kelly" uniqKey="Vining K" first="Kelly" last="Vining">Kelly Vining</name>
<name sortKey="Wilhelm, Larry J" sort="Wilhelm, Larry J" uniqKey="Wilhelm L" first="Larry J" last="Wilhelm">Larry J. Wilhelm</name>
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