Serveur d'exploration sur les relations entre la France et l'Australie

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Differential Accumulation of Retroelements and Diversification of NB-LRR Disease Resistance Genes in Duplicated Regions following Polyploidy in the Ancestor of Soybean1[W][OA]

Identifieur interne : 000456 ( Ncbi/Curation ); précédent : 000455; suivant : 000457

Differential Accumulation of Retroelements and Diversification of NB-LRR Disease Resistance Genes in Duplicated Regions following Polyploidy in the Ancestor of Soybean1[W][OA]

Auteurs : Roger W. Innes ; Carine Ameline-Torregrosa ; Tom Ashfield ; Ethalinda Cannon ; Steven B. Cannon ; Ben Chacko ; Nicolas W. G. Chen ; Arnaud Couloux ; Anita Dalwani ; Roxanne Denny ; Shweta Deshpande ; Ashley N. Egan ; Natasha Glover ; Christian S. Hans ; Stacy Howell ; Dan Ilut ; Scott Jackson ; Hongshing Lai ; Jafar Mammadov ; Sara Martin Del Campo ; Michelle Metcalf ; Ashley Nguyen ; Majesta O'Bleness ; Bernard E. Pfeil ; Ram Podicheti ; Milind B. Ratnaparkhe ; Sylvie Samain ; Iryna Sanders ; Béatrice Ségurens ; Mireille Sévignac ; Sue Sherman-Broyles ; Vincent Thareau ; Dominic M. Tucker ; Jason Walling ; Adam Wawrzynski ; Jing Yi ; Jeff J. Doyle ; Valérie Geffroy ; Bruce A. Roe ; M. A. Saghai Maroof ; Nevin D. Young

Source :

RBID : PMC:2593655

Abstract

The genomes of most, if not all, flowering plants have undergone whole genome duplication events during their evolution. The impact of such polyploidy events is poorly understood, as is the fate of most duplicated genes. We sequenced an approximately 1 million-bp region in soybean (Glycine max) centered on the Rpg1-b disease resistance gene and compared this region with a region duplicated 10 to 14 million years ago. These two regions were also compared with homologous regions in several related legume species (a second soybean genotype, Glycine tomentella, Phaseolus vulgaris, and Medicago truncatula), which enabled us to determine how each of the duplicated regions (homoeologues) in soybean has changed following polyploidy. The biggest change was in retroelement content, with homoeologue 2 having expanded to 3-fold the size of homoeologue 1. Despite this accumulation of retroelements, over 77% of the duplicated low-copy genes have been retained in the same order and appear to be functional. This finding contrasts with recent analyses of the maize (Zea mays) genome, in which only about one-third of duplicated genes appear to have been retained over a similar time period. Fluorescent in situ hybridization revealed that the homoeologue 2 region is located very near a centromere. Thus, pericentromeric localization, per se, does not result in a high rate of gene inactivation, despite greatly accelerated retrotransposon accumulation. In contrast to low-copy genes, nucleotide-binding-leucine-rich repeat disease resistance gene clusters have undergone dramatic species/homoeologue-specific duplications and losses, with some evidence for partitioning of subfamilies between homoeologues.


Url:
DOI: 10.1104/pp.108.127902
PubMed: 18842825
PubMed Central: 2593655

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PMC:2593655

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<title xml:lang="en" level="a" type="main">Differential Accumulation of Retroelements and Diversification of NB-LRR Disease Resistance Genes in Duplicated Regions following Polyploidy in the Ancestor of Soybean
<xref ref-type="fn" rid="fn1">1</xref>
<xref ref-type="fn" rid="fn3">[W]</xref>
<xref ref-type="fn" rid="fn4">[OA]</xref>
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<name sortKey="Ameline Torregrosa, Carine" sort="Ameline Torregrosa, Carine" uniqKey="Ameline Torregrosa C" first="Carine" last="Ameline-Torregrosa">Carine Ameline-Torregrosa</name>
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<name sortKey="Ashfield, Tom" sort="Ashfield, Tom" uniqKey="Ashfield T" first="Tom" last="Ashfield">Tom Ashfield</name>
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<name sortKey="Cannon, Ethalinda" sort="Cannon, Ethalinda" uniqKey="Cannon E" first="Ethalinda" last="Cannon">Ethalinda Cannon</name>
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<name sortKey="Denny, Roxanne" sort="Denny, Roxanne" uniqKey="Denny R" first="Roxanne" last="Denny">Roxanne Denny</name>
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<name sortKey="Egan, Ashley N" sort="Egan, Ashley N" uniqKey="Egan A" first="Ashley N." last="Egan">Ashley N. Egan</name>
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<name sortKey="Glover, Natasha" sort="Glover, Natasha" uniqKey="Glover N" first="Natasha" last="Glover">Natasha Glover</name>
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<name sortKey="Hans, Christian S" sort="Hans, Christian S" uniqKey="Hans C" first="Christian S." last="Hans">Christian S. Hans</name>
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<name sortKey="Howell, Stacy" sort="Howell, Stacy" uniqKey="Howell S" first="Stacy" last="Howell">Stacy Howell</name>
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<name sortKey="Ilut, Dan" sort="Ilut, Dan" uniqKey="Ilut D" first="Dan" last="Ilut">Dan Ilut</name>
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<name sortKey="Jackson, Scott" sort="Jackson, Scott" uniqKey="Jackson S" first="Scott" last="Jackson">Scott Jackson</name>
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<name sortKey="Lai, Hongshing" sort="Lai, Hongshing" uniqKey="Lai H" first="Hongshing" last="Lai">Hongshing Lai</name>
</author>
<author>
<name sortKey="Mammadov, Jafar" sort="Mammadov, Jafar" uniqKey="Mammadov J" first="Jafar" last="Mammadov">Jafar Mammadov</name>
</author>
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<name sortKey="Del Campo, Sara Martin" sort="Del Campo, Sara Martin" uniqKey="Del Campo S" first="Sara Martin" last="Del Campo">Sara Martin Del Campo</name>
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<name sortKey="Metcalf, Michelle" sort="Metcalf, Michelle" uniqKey="Metcalf M" first="Michelle" last="Metcalf">Michelle Metcalf</name>
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<name sortKey="Nguyen, Ashley" sort="Nguyen, Ashley" uniqKey="Nguyen A" first="Ashley" last="Nguyen">Ashley Nguyen</name>
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<name sortKey="O Bleness, Majesta" sort="O Bleness, Majesta" uniqKey="O Bleness M" first="Majesta" last="O'Bleness">Majesta O'Bleness</name>
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<name sortKey="Pfeil, Bernard E" sort="Pfeil, Bernard E" uniqKey="Pfeil B" first="Bernard E." last="Pfeil">Bernard E. Pfeil</name>
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<name sortKey="Podicheti, Ram" sort="Podicheti, Ram" uniqKey="Podicheti R" first="Ram" last="Podicheti">Ram Podicheti</name>
</author>
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<name sortKey="Ratnaparkhe, Milind B" sort="Ratnaparkhe, Milind B" uniqKey="Ratnaparkhe M" first="Milind B." last="Ratnaparkhe">Milind B. Ratnaparkhe</name>
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<name sortKey="Samain, Sylvie" sort="Samain, Sylvie" uniqKey="Samain S" first="Sylvie" last="Samain">Sylvie Samain</name>
</author>
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<name sortKey="Sanders, Iryna" sort="Sanders, Iryna" uniqKey="Sanders I" first="Iryna" last="Sanders">Iryna Sanders</name>
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<name sortKey="Segurens, Beatrice" sort="Segurens, Beatrice" uniqKey="Segurens B" first="Béatrice" last="Ségurens">Béatrice Ségurens</name>
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<name sortKey="Sevignac, Mireille" sort="Sevignac, Mireille" uniqKey="Sevignac M" first="Mireille" last="Sévignac">Mireille Sévignac</name>
</author>
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<name sortKey="Sherman Broyles, Sue" sort="Sherman Broyles, Sue" uniqKey="Sherman Broyles S" first="Sue" last="Sherman-Broyles">Sue Sherman-Broyles</name>
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<name sortKey="Walling, Jason" sort="Walling, Jason" uniqKey="Walling J" first="Jason" last="Walling">Jason Walling</name>
</author>
<author>
<name sortKey="Wawrzynski, Adam" sort="Wawrzynski, Adam" uniqKey="Wawrzynski A" first="Adam" last="Wawrzynski">Adam Wawrzynski</name>
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</author>
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<div type="abstract" xml:lang="en">
<p>The genomes of most, if not all, flowering plants have undergone whole genome duplication events during their evolution. The impact of such polyploidy events is poorly understood, as is the fate of most duplicated genes. We sequenced an approximately 1 million-bp region in soybean (
<italic>Glycine max</italic>
) centered on the
<italic>Rpg1-b</italic>
disease resistance gene and compared this region with a region duplicated 10 to 14 million years ago. These two regions were also compared with homologous regions in several related legume species (a second soybean genotype,
<italic>Glycine tomentella</italic>
,
<italic>Phaseolus vulgaris</italic>
, and
<italic>Medicago truncatula</italic>
), which enabled us to determine how each of the duplicated regions (homoeologues) in soybean has changed following polyploidy. The biggest change was in retroelement content, with homoeologue 2 having expanded to 3-fold the size of homoeologue 1. Despite this accumulation of retroelements, over 77% of the duplicated low-copy genes have been retained in the same order and appear to be functional. This finding contrasts with recent analyses of the maize (
<italic>Zea mays</italic>
) genome, in which only about one-third of duplicated genes appear to have been retained over a similar time period. Fluorescent in situ hybridization revealed that the homoeologue 2 region is located very near a centromere. Thus, pericentromeric localization, per se, does not result in a high rate of gene inactivation, despite greatly accelerated retrotransposon accumulation. In contrast to low-copy genes, nucleotide-binding-leucine-rich repeat disease resistance gene clusters have undergone dramatic species/homoeologue-specific duplications and losses, with some evidence for partitioning of subfamilies between homoeologues.</p>
</div>
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