Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome Evolution
Polyploidy is a major force in plant evolution and speciation. In newly formed allopolyploids, pairing between related chromosomes from different subgenomes (homoeologous chromosomes) during meiosis is common. The initial stages of allopolyploid formation are characterized by a spectrum of saltation...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2020-08-01
|
| Series: | Frontiers in Genetics |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/article/10.3389/fgene.2020.01014/full |
| _version_ | 1819206221060636672 |
|---|---|
| author | Annaliese S. Mason Jonathan F. Wendel |
| author_facet | Annaliese S. Mason Jonathan F. Wendel |
| author_sort | Annaliese S. Mason |
| collection | DOAJ |
| description | Polyploidy is a major force in plant evolution and speciation. In newly formed allopolyploids, pairing between related chromosomes from different subgenomes (homoeologous chromosomes) during meiosis is common. The initial stages of allopolyploid formation are characterized by a spectrum of saltational genomic and regulatory alterations that are responsible for evolutionary novelty. Here we highlight the possible effects and roles of recombination between homoeologous chromosomes during the early stages of allopolyploid stabilization. Homoeologous exchanges (HEs) have been reported in young allopolyploids from across the angiosperms. Although all lineages undergo karyotype change via chromosome rearrangements over time, the early generations after allopolyploid formation are predicted to show an accelerated rate of genomic change. HEs can also cause changes in allele dosage, genome-wide methylation patterns, and downstream phenotypes, and can hence be responsible for speciation and genome stabilization events. Additionally, we propose that fixation of duplication – deletion events resulting from HEs could lead to the production of genomes which appear to be a mix of autopolyploid and allopolyploid segments, sometimes termed “segmental allopolyploids.” We discuss the implications of these findings for our understanding of the relationship between genome instability in novel polyploids and genome evolution. |
| first_indexed | 2024-12-23T05:04:09Z |
| format | Article |
| id | doaj.art-14ac616f488140c1aa5b7173260c513d |
| institution | Directory Open Access Journal |
| issn | 1664-8021 |
| language | English |
| last_indexed | 2024-12-23T05:04:09Z |
| publishDate | 2020-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Genetics |
| spelling | doaj.art-14ac616f488140c1aa5b7173260c513d2022-12-21T17:59:09ZengFrontiers Media S.A.Frontiers in Genetics1664-80212020-08-011110.3389/fgene.2020.01014564174Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome EvolutionAnnaliese S. Mason0Jonathan F. Wendel1Plant Breeding Department, Justus Liebig University Giessen, Giessen, GermanyEcology, Evolution, and Organismal Biology Department, Iowa State University, Ames, IA, United StatesPolyploidy is a major force in plant evolution and speciation. In newly formed allopolyploids, pairing between related chromosomes from different subgenomes (homoeologous chromosomes) during meiosis is common. The initial stages of allopolyploid formation are characterized by a spectrum of saltational genomic and regulatory alterations that are responsible for evolutionary novelty. Here we highlight the possible effects and roles of recombination between homoeologous chromosomes during the early stages of allopolyploid stabilization. Homoeologous exchanges (HEs) have been reported in young allopolyploids from across the angiosperms. Although all lineages undergo karyotype change via chromosome rearrangements over time, the early generations after allopolyploid formation are predicted to show an accelerated rate of genomic change. HEs can also cause changes in allele dosage, genome-wide methylation patterns, and downstream phenotypes, and can hence be responsible for speciation and genome stabilization events. Additionally, we propose that fixation of duplication – deletion events resulting from HEs could lead to the production of genomes which appear to be a mix of autopolyploid and allopolyploid segments, sometimes termed “segmental allopolyploids.” We discuss the implications of these findings for our understanding of the relationship between genome instability in novel polyploids and genome evolution.https://www.frontiersin.org/article/10.3389/fgene.2020.01014/fullpolyploidyhomoeologous exchangeschromosome behaviorsyntheticsgenome evolution |
| spellingShingle | Annaliese S. Mason Jonathan F. Wendel Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome Evolution Frontiers in Genetics polyploidy homoeologous exchanges chromosome behavior synthetics genome evolution |
| title | Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome Evolution |
| title_full | Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome Evolution |
| title_fullStr | Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome Evolution |
| title_full_unstemmed | Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome Evolution |
| title_short | Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome Evolution |
| title_sort | homoeologous exchanges segmental allopolyploidy and polyploid genome evolution |
| topic | polyploidy homoeologous exchanges chromosome behavior synthetics genome evolution |
| url | https://www.frontiersin.org/article/10.3389/fgene.2020.01014/full |
| work_keys_str_mv | AT annaliesesmason homoeologousexchangessegmentalallopolyploidyandpolyploidgenomeevolution AT jonathanfwendel homoeologousexchangessegmentalallopolyploidyandpolyploidgenomeevolution |