The origin of unusual chromosome constitutions among newly formed allopolyploids

Oleszczuk, Sylwia; Lukaszewski, Adam J.

doi:10.3732/ajb.1300286

Cited by 32 publications

(41 citation statements)

References 37 publications

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“…During cell division, improper chromatid pairing may eventually lead to developmental problems and reduced hybrid fitness (Hailu et al . ; Oleszczuk & Lukaszewski ).…”

Section: Introductionmentioning

confidence: 99%

“…Such mobile repeat clusters might reduce fitness or even cause abortive development because they are often associated with chromosomal heterochromatin, thereby possibly affecting genomic stability (Ilkova et al 2013), chromosome pairing (Hernandez-Hernandez et al 2008), recombination (Talbert & Henikoff 2010) and expression of neighbouring genes by epigenetic position effects (Pezer & Ugarkovic 2012). During cell division, improper chromatid pairing may eventually lead to developmental problems and reduced hybrid fitness (Hailu et al 1999;Oleszczuk & Lukaszewski 2014).…”

Section: Introductionmentioning

confidence: 99%

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Chironomus riparius (Diptera) genome sequencing reveals the impact of minisatellite transposable elements on population divergence

et al. 2017

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Active transposable elements (TEs) may result in divergent genomic insertion and abundance patterns among conspecific populations. Upon secondary contact, such divergent genetic backgrounds can theoretically give rise to classical Dobzhansky-Muller incompatibilities (DMI), thus contributing to the evolution of endogenous genetic barriers and eventually causing population divergence. We investigated differential TE abundance among conspecific populations of the nonbiting midge Chironomus riparius and evaluated their potential role in causing endogenous genetic incompatibilities between these populations. We focussed on a Chironomus-specific TE, the minisatellite-like Cla-element, whose activity is associated with speciation in the genus. Using a newly generated and annotated draft genome for a genomic study with five natural C. riparius populations, we found highly population-specific TE insertion patterns with many private insertions. A significant correlation of the pairwise F estimated from genomewide single-nucleotide polymorphisms (SNPs) and the F estimated from TEs is consistent with drift as the major force driving TE population differentiation. However, the significantly higher Cla-element F level due to a high proportion of differentially fixed Cla-element insertions also indicates selection against segregating (i.e. heterozygous) insertions. With reciprocal crossing experiments and fluorescent in situ hybridization of Cla-elements to polytene chromosomes, we documented phenotypic effects on female fertility and chromosomal mispairings. We propose that the inferred negative selection on heterozygous Cla-element insertions may cause endogenous genetic barriers and therefore acts as DMI among C. riparius populations. The intrinsic genomic turnover exerted by TEs may thus have a direct impact on population divergence that is operationally different from drift and local adaptation.

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“…During cell division, improper chromatid pairing may eventually lead to developmental problems and reduced hybrid fitness (Hailu et al . ; Oleszczuk & Lukaszewski ).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chironomus riparius (Diptera) genome sequencing reveals the impact of minisatellite transposable elements on population divergence

et al. 2017

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“…Precocious migration of univalents can give rise to noncompensating nulli-disomic gametes, where random loss and pairing of homoeologues leads to gametes disomic for one homoeologue and nullisomic for the other. These events greatly increase the number of possible combinations, even in gametes with an expected and balanced chromosome number (Oleszczuk and Lukaszewski, 2014). Geng et al (1979) developed a general probability model for random assortment of chromosomes, and analysis of aneuploid and interspecific hybrid datasets related to Triticum fit it well.…”

Section: Behavior Of Univalentsmentioning

confidence: 99%

Breeding Perennial Grain Crops Based on Wheat

Curwen-McAdams

Jones

2017

Crop Science

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Wild relatives offer a diversity of traits potentially useful in crop improvement. Identification of major genes for resistance to biotic and abiotic stresses, in conjunction with targeted introgression, has introduced some of these traits into cultivated varieties. The difficulty of transferring complex traits, and associated linkage drag, has limited the ability of breeding programs to fully use important genetic variation. Wheat (Triticum L.) is an example of an important crop with large secondary and tertiary genepools of species capable of producing viable offspring by cross pollination. Wheat is annual, but most of the related species in the Triticeae Dumort tribe are perennials. An unknown number of genes control the perennial habit, although previous work has shown that it is a complex trait with quantitative expression. Lack of recombination between the parental genomes and complexity of the trait suggest another avenue for breeding: the addition of a genome. Multiple genera can hybridize with wheat, and some combinations produce stable amphiploids. The development of perennial grain and forage crops balancing the agronomics of wheat with the polycarpic habit of its relatives is promising. The approach is similar to Triticale (× Triticosecale Wittmack ex A. Camus), where new crops are developed combining the desirable qualities of the parents. Through prebreeding of the wild relatives, application of insight into meiosis, and strategic use of known genes, it should be more efficient to breed perennial grain crops adapted to diverse production systems.

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“…; Lim et al, ; Chester et al, , ; Lipman et al, ). Compensated aneuploidy resulted in allopolyploids with the expected tetraploid number of chromosomes but with some unbalanced homoeologous pairs (e.g., 3+1, 4+0), and may explain deviations from disomic inheritance and fixed heterozygosity of parental alleles in Tragopogon and other allopolyploid angiosperms (e.g., Brassica : Xiong et al, ; Triticum : Zhang et al, ; Oleszczuk & Lukaszewski, ). Similar studies of genomic structural changes in allopolyploid ferns would be invaluable for discerning how hybrid ferns parse and utilize their parental subgenomes and for informing the long‐term genomic consequences of hybridization and polyploidy in ferns.…”

Section: Transcriptomic Genetic and Genomic Consequences Of Hybridimentioning

confidence: 99%

Genetic and genomic aspects of hybridization in ferns

Sigel

2016

J of Sytematics Evolution

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The morphological and ecological intermediacy of hybrid taxa has long interested and challenged fern biologists, resulting in numerous systematic contributions focused on disentangling relationships within reticulate species complexes. From a genetic perspective, hybrid ferns are especially interesting because they represent the union of divergent parental genomes in unique evolutionary entities. This review summarizes advances in our knowledge of the genetic and genomic aspects of hybridization in ferns from the mid-20th century to the present. The different organismal products of hybridization, evolutionary aspects of additive and non-additive gene expression in allopolyploids, genetic and genomic mechanisms leading to gene silencing and loss, the roles of multiple origins and introgression for imparting genetic variation to hybrid fern taxa and their progenitors, and the utility of allopolyploid ferns to investigate mechanisms of genome evolution in the homosporous ferns are discussed. Comparisons are made to other plant lineages and important future research directions are highlighted, with the goal of stimulating additional research on hybrid ferns.

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The origin of unusual chromosome constitutions among newly formed allopolyploids

Cited by 32 publications

References 37 publications

Chironomus riparius (Diptera) genome sequencing reveals the impact of minisatellite transposable elements on population divergence

Chironomus riparius (Diptera) genome sequencing reveals the impact of minisatellite transposable elements on population divergence

Breeding Perennial Grain Crops Based on Wheat

Genetic and genomic aspects of hybridization in ferns

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