Repeated Whole-Genome Duplication, Karyotype Reshuffling, and Biased Retention of Stress-Responding Genes in Buckler Mustard.

Details

Serval ID
serval:BIB_29C415D9CBC6
Type
Article: article from journal or magazin.
Collection
Publications
Title
Repeated Whole-Genome Duplication, Karyotype Reshuffling, and Biased Retention of Stress-Responding Genes in Buckler Mustard.
Journal
The Plant cell
Author(s)
Geiser C., Mandáková T., Arrigo N., Lysak M.A., Parisod C.
ISSN
1532-298X (Electronic)
ISSN-L
1040-4651
Publication state
Published
Issued date
01/2016
Volume
28
Number
1
Pages
17-27
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
Whole-genome duplication (WGD) is usually followed by gene loss and karyotype repatterning. Despite evidence of new adaptive traits associated with WGD, the underpinnings and evolutionary significance of such genome fractionation remain elusive. Here, we use Buckler mustard (Biscutella laevigata) to infer processes that have driven the retention of duplicated genes after recurrent WGDs. In addition to the β- and α-WGD events shared by all Brassicaceae, cytogenetic and transcriptome analyses revealed two younger WGD events that occurred at times of environmental changes in the clade of Buckler mustard (Biscutelleae): a mesopolyploidy event from the late Miocene that was followed by considerable karyotype reshuffling and chromosome number reduction and a neopolyploidy event during the Pleistocene. Although a considerable number of the older duplicates presented signatures of retention under positive selection, the majority of retained duplicates arising from the younger mesopolyploidy WGD event matched predictions of the gene balance hypothesis and showed evidence of strong purifying selection as well as enrichment in gene categories responding to abiotic stressors. Retention of large stretches of chromosomes for both genomic copies supported the hypothesis that cycles of WGD and biased fractionation shaped the genome of this stress-tolerant polypolyloid, promoting the adaptive recruitment of stress-responding genes in the face of environmental challenges.

Keywords
Fluorescence, Gene Duplication, Gene Ontology, Genes, Plant, Karyotype, Models, Genetic, Mustard Plant/genetics, Selection, Genetic, Stress, Physiological/genetics, Transcriptome/genetics
Pubmed
Open Access
Yes
Create date
15/12/2015 14:49
Last modification date
20/08/2019 14:09
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