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10 results on '"Jenczewski, Eric"'

1. The molecular biology of meiosis in plants.

Author

Mercier R, Mézard C, Jenczewski E, Macaisne N, and Grelon M

Subjects
Cell Cycle, Chromosome Pairing, Chromosomes, Plant, Polyploidy, Genes, Plant, Meiosis, Plants genetics, Recombination, Genetic
Abstract

Meiosis is the cell division that reshuffles genetic information between generations. Recently, much progress has been made in understanding this process; in particular, the identification and functional analysis of more than 80 plant genes involved in meiosis have dramatically deepened our knowledge of this peculiar cell division. In this review, we provide an overview of advancements in the understanding of all aspects of plant meiosis, including recombination, chromosome synapsis, cell cycle control, chromosome distribution, and the challenge of polyploidy.

Published
2015
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2. Focus on polyploidy.

Author

Ainouche ML and Jenczewski E

Subjects
Biodiversity, Gene Expression Regulation, Plant, Genome, Plant genetics, Plants genetics, Polyploidy
Published
2010
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3. Genetic regulation of meiosis in polyploid species: new insights into an old question.

Author

Cifuentes M, Grandont L, Moore G, Chèvre AM, and Jenczewski E

Subjects
Biological Evolution, Diploidy, Species Specificity, Meiosis genetics, Plants genetics, Polyploidy
Abstract

Precise chromosome segregation is vital for polyploid speciation. Here, we highlight recent findings that revitalize the old question of the genetic control of diploid-like meiosis behaviour in polyploid species. We first review new information on the genetic control of autopolyploid and allopolyploid cytological diploidization, notably in wheat and Brassica. These major advances provide new opportunities for speculating about the adaptation of meiosis during polyploid evolution. Some of these advances are discussed, and it is suggested that research on polyploidy and on meiosis should no longer be unlinked.

Published
2010
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8. Manipulation of crossover frequency and distribution for plant breeding

Author

Blary, Aurélien, Jenczewski, Eric, Institut Jean-Pierre Bourgin (IJPB), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, Université Paris Saclay (COmUE), Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, and Justus-Liebig-Universität Gießen (JLU)

Subjects
méiose, recombinaison génétique, [SDV]Life Sciences [q-bio], fungi, crossing over, food and beverages, division cellulaire, Review Article, Plants, Chromosomes, Plant, Meiosis, Plant Breeding, [SDV.IDA]Life Sciences [q-bio]/Food engineering, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Crossing Over, Genetic, Homologous Recombination, amélioration des plantes
Abstract

International audience; The crossovers (COs) that occur during meiotic recombination lead to genetic diversity upon which natural and artificial selection can act. The potential of tinkering with the mechanisms of meiotic recombination to increase the amount of genetic diversity accessible for breeders has been under the research spotlight for years. A wide variety of approaches have been proposed to increase CO frequency, alter CO distribution and induce COs between non-homologous chromosomal regions. For most of these approaches, translational biology will be crucial for demonstrating how these strategies can be of practical use in plant breeding. In this review, we describe how tinkering with meiotic recombination could benefit plant breeding and give concrete examples of how these strategies could be implemented into breeding programs.

Published
2019

9. Modelling Sex-Specific Crossover Patterning in Arabidopsis.

Author

Lloyd, Andrew and Jenczewski, Eric

Subjects
*CHROMOSOMES, *BIOLOGICAL models, *CELL physiology, *DNA, *GENE expression, *GENETIC polymorphisms, *GENETICS, *GERM cells, *PLANTS, *PHYSIOLOGY
Abstract

"Interference" is a major force governing the patterning of meiotic crossovers. A leading model describing how interference influences crossover patterning is the beam-film model, a mechanical model based on the accumulation and redistribution of crossover-promoting "stress" along the chromosome axis. We use the beam-film model in conjunction with a large Arabidopsis reciprocal backcross data set to gain "mechanistic" insights into the differences between male and female meiosis, and crossover patterning. Beam-film modeling suggests that the underlying mechanics of crossover patterning and interference are identical in the two sexes, with the large difference in recombination rates and distributions able to be entirely explained by the shorter chromosome axes in females. The modeling supports previous indications that fewer crossovers occur via the class II pathway in female meiosis and that this could be explained by reduced DNA double-strand breaks in female meiosis, paralleling the observed reduction in synaptonemal complex length between the two sexes. We also demonstrate that changes in the strength of suppression of neighboring class I crossovers can have opposite effects on "effective" interference depending on the distance between two genetic intervals. [ABSTRACT FROM AUTHOR]

Published
2019
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10. Focus on polyploidy

Author

Aïnouche, Malika L., Jenczewski, Eric, Briand, Valerie, Appel à projets de recherche dans le domaine de la Biodiversité - Effet de la polyploïdie sur la biodiversité et l'évolution du génome des plantes (BioPPG) - - Polyploidie2005 - ANR-05-BDIV-0015 - BDIV - VALID, Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS), UMR ENSAR-INRA, Station de Génétique Végétale et Amélioration des Plantes, Institut National de la Recherche Agronomique (INRA), ANR Polyploidy,ANR Polyploidy, Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), ANR-05-BDIV-0015,Polyploidie,Effet de la polyploïdie sur la biodiversité et l'évolution du génome des plantes (BioPPG)(2005), Université de Rennes (UR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Amélioration des Plantes et Biotechnologies Végétales (APBV), and Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST

Subjects
mechanisms, epigenetics, plants, adaptation, genome evolution, genome duplications, recombination, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, transcriptomics, speciation, meiosis, Gene expression, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, transposable elements, polyploidy
Abstract

International audience; Polyploidy (whole-genome duplication) has played a pervasive role in the evolution of fungi and animals, and is particularly prominent in plants (Wendel & Doyle, 2005; Cui et al., 2006; Otto, 2007; Wood et al., 2009). This important evolutionary phenomenon has attracted renewed and growing interest from the scientific community in the last decade since it was discovered that even the smallest plant genomes considered to be ‘diploid' (e.g. Arabidopsis thaliana, reviewed in Henry et al., 2006) have incurred at least one round of whole-genome duplication, possibly predating the origins of the angiosperms (Soltis et al., 2009). Polyploidy is an important speciation mechanism for all eukaryotes and has profound impacts on biodiversity dynamics and ecosystem functioning. Newly formed polyploids, and particularly those of hybrid origin (allopolyploids), frequently exhibit rapid range expansion (Ainouche et al., 2009), and over long periods of evolutionary time, polyploidy has increased morphological complexity and probably reduced the risk of species extinction (Fawcett et al., 2009). Last, but not least, genome duplication has often provided the raw material for plant domestication (e.g. wheat, Dubkovsky & Dvorak, 2007) and thus has had a major impact on human societies and the development of an agrarian lifestyle.

Published
2010

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