Special Issue "Cytonuclear Interactions in Polyploid Species"

A special issue of Genes (ISSN 2073-4425). This special issue belongs to the section "Population and Evolutionary Genetics and Genomics".

Deadline for manuscript submissions: 31 December 2019.

Special Issue Editors

Prof. France Dufresne
E-Mail Website
Guest Editor
Universite du Quebec a Rimouski, Department of Biology, Rimouski, QC G5L 3A1, Canada
Interests: evolutionary biology; genetics; model organisms; poliploidy; allopolyploidy; cytonuclear interactions
Dr. Jennifer Tate
E-Mail Website
Guest Editor
Institute of Fundamental Sciences, Massey University, Palmerston North 4442, New Zealand.
Interests: plant speciation; molecular phylogenetics; hybridization; polyploidy; whole genome duplication
Dr. Daniel Sloan
E-Mail Website
Guest Editor
Department of Biology, Colorado State University, Fort Collins, CO 80523, USA
Interests: molecular evolution and genomics; biological diversity; genome evolution; plant systems; DNA sequencing

Special Issue Information

Dear Colleagues,

Polyploidy is widespread in plants and less frequent in animals but serves as an important speciation mechanism in both groups. Polyploidy is accompanied by drastic changes in genome organization including differential patterns of gene loss, gene silencing, genome-wide expression dominance, and epigenetic reprogramming. One underexplored dimension of polyploid evolution is cytonuclear interactions. Allopolyploid animals must ensure coordination between the effectively haploid and typically uniparentally inherited mitochondrial genome and the duplicated biparentally inherited nuclear genome. In allopolyploid plants, an additional cytoplasmic genome (the plastome) must interact with the duplicated nuclear genome. Whole genome duplication may lead to a stochiometric imbalance between these interacting genomes and perturb the assembly of enzyme complexes and the proper functioning of mitochondria and chloroplasts. Recent studies have shown compensatory mechanisms in young plant polyploids with organelle-targeting nuclear genes returning to a single copy following polyploidization. In animals, the mitochondrial genome is typically inherited maternally and numerous cases of hybrid breakdown and incompatibilities have been traced to the disruption of cytonuclear coordination in diploids. However, not much is known about how doubling the nuclear genome perturbs interactions with the mitochondrial genome in polyploid animals or plants. As polyploidy allows new interactions between highly divergent cytoplasmic and nuclear genomes, cytonuclear interactions may be more challenging in allopolyploids than in diploid hybrids.

This Special Issue aims to explore and contrast coordination and coevolution between cytoplasmic and nuclear genomes in both plant and animal polyploids.

Prof. France Dufresne
Dr. Jennifer Tate
Dr. Daniel Sloan
Guest Editors

Manuscript Submission Information

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Keywords

  • polyploidy
  • evolution
  • allopolyploidy
  • cytonuclear interactions
  • mitochondria
  • stoichiometry
  • dosage compensation
  • genome organization
  • animal models
  • plant models

Published Papers (1 paper)

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Research

Open AccessArticle
Nuclear–Cytoplasmic Coevolution Analysis of RuBisCO in Synthesized Cucumis Allopolyploid
Genes 2019, 10(11), 869; https://doi.org/10.3390/genes10110869 - 30 Oct 2019
Abstract
Allopolyploids are often faced with the challenge of maintaining well-coordination between nuclear and cytoplasmic genes inherited from different species. The synthetic allotetraploid Cucumis × hytivus is a useful model to explore cytonuclear coevolution. In this study, the sequences and expression of cytonuclear enzyme [...] Read more.
Allopolyploids are often faced with the challenge of maintaining well-coordination between nuclear and cytoplasmic genes inherited from different species. The synthetic allotetraploid Cucumis × hytivus is a useful model to explore cytonuclear coevolution. In this study, the sequences and expression of cytonuclear enzyme complex RuBisCO as well as its content and activity in C. × hytivus were compared to its parents to explore plastid–nuclear coevolution. The plastome-coded rbcL gene sequence was confirmed to be stable maternal inheritance, and parental copy of nuclear rbcS genes were both preserved in C. × hytivus. Thus, the maternal plastid may interact with the biparentally inherited rbcS alleles. The expression of the rbcS gene of C-homoeologs (paternal) was significantly higher than that of H-homoeologs (maternal) in C. × hytivus (HHCC). Protein interaction prediction analysis showed that the rbcL protein has stronger binding affinity to the paternal copy of rbcS protein than that of maternal copy in C. × hytivus, which might explain the transcriptional bias of the rbcS homoeologs. Moreover, both the activity and content of RuBisCO in C. × hytivus showed mid-parent heterosis. In summary, our results indicate a paternal transcriptional bias of the rbcS genes in C. × hytivus, and we found new nuclear–cytoplasmic combination may be one of the reasons for allopolyploids heterosis. Full article
(This article belongs to the Special Issue Cytonuclear Interactions in Polyploid Species)
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