Homoeologous recombination in allopolyploids: the polyploid ratchet
- PMID: 20002315
- DOI: 10.1111/j.1469-8137.2009.03089.x
Homoeologous recombination in allopolyploids: the polyploid ratchet
Abstract
Polyploidization and recombination are two important processes driving evolution through the building and reshaping of genomes. Allopolyploids arise from hybridization and chromosome doubling among distinct, yet related species. Polyploids may display novel variation relative to their progenitors, and the sources of this variation lie not only in the acquisition of extra gene dosages, but also in the genomic changes that occur after divergent genomes unite. Genomic changes (deletions, duplications, and translocations) have been detected in both recently formed natural polyploids and resynthesized polyploids. In resynthesized Brassica napus allopolyploids, there is evidence that many genetic changes are the consequence of homoeologous recombination. Homoeologous recombination can generate novel gene combinations and phenotypes, but may also destabilize the karyotype and lead to aberrant meiotic behavior and reduced fertility. Thus, natural selection plays a role in the establishment and maintenance of fertile natural allopolyploids that have stabilized chromosome inheritance and a few advantageous chromosomal rearrangements. We discuss the evidence for genome rearrangements that result from homoeologous recombination in resynthesized B. napus and how these observations may inform phenomena such as chromosome replacement, aneuploidy, non-reciprocal translocations and gene conversion seen in other polyploids.
Similar articles
-
Homoeologous shuffling and chromosome compensation maintain genome balance in resynthesized allopolyploid Brassica napus.Proc Natl Acad Sci U S A. 2011 May 10;108(19):7908-13. doi: 10.1073/pnas.1014138108. Epub 2011 Apr 21. Proc Natl Acad Sci U S A. 2011. PMID: 21512129 Free PMC article.
-
Genomic changes in resynthesized Brassica napus and their effect on gene expression and phenotype.Plant Cell. 2007 Nov;19(11):3403-17. doi: 10.1105/tpc.107.054346. Epub 2007 Nov 16. Plant Cell. 2007. PMID: 18024568 Free PMC article.
-
Analysis of gene expression in resynthesized Brassica napus Allopolyploids using arabidopsis 70mer oligo microarrays.PLoS One. 2009;4(3):e4760. doi: 10.1371/journal.pone.0004760. Epub 2009 Mar 10. PLoS One. 2009. PMID: 19274085 Free PMC article.
-
Meiosis in Polyploids and Implications for Genetic Mapping: A Review.Genes (Basel). 2021 Sep 27;12(10):1517. doi: 10.3390/genes12101517. Genes (Basel). 2021. PMID: 34680912 Free PMC article. Review.
-
Homoeologous Exchanges, Segmental Allopolyploidy, and Polyploid Genome Evolution.Front Genet. 2020 Aug 28;11:1014. doi: 10.3389/fgene.2020.01014. eCollection 2020. Front Genet. 2020. PMID: 33005183 Free PMC article. Review.
Cited by
-
Investigation of Brassica and its relative genomes in the post-genomics era.Hortic Res. 2022 Aug 25;9:uhac182. doi: 10.1093/hr/uhac182. eCollection 2022. Hortic Res. 2022. PMID: 36338847 Free PMC article.
-
Novel Brassica hybrids with different resistance to Leptosphaeria maculans reveal unbalanced rDNA signal patterns.Open Life Sci. 2022 Mar 31;17(1):293-301. doi: 10.1515/biol-2022-0032. eCollection 2022. Open Life Sci. 2022. PMID: 35434369 Free PMC article.
-
Host adaptation and speciation through hybridization and polyploidy in Phytophthora.PLoS One. 2013 Dec 26;8(12):e85385. doi: 10.1371/journal.pone.0085385. eCollection 2013. PLoS One. 2013. PMID: 24386473 Free PMC article.
-
Asymmetric expression patterns reveal a strong maternal effect and dosage compensation in polyploid hybrid fish.BMC Genomics. 2018 Jul 3;19(1):517. doi: 10.1186/s12864-018-4883-7. BMC Genomics. 2018. PMID: 29969984 Free PMC article.
-
Post-polyploidisation morphotype diversification associates with gene copy number variation.Sci Rep. 2017 Feb 6;7:41845. doi: 10.1038/srep41845. Sci Rep. 2017. PMID: 28165502 Free PMC article.
Publication types
MeSH terms
LinkOut - more resources
Full Text Sources
