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Martini E, Borde V, Legendre M, Audic S, Regnault B, Soubigou G, Dujon B, Llorente B. Genome-wide analysis of heteroduplex DNA in mismatch repair-deficient yeast cells reveals novel properties of meiotic recombination pathways. PLoS Genet 2011; 7:e1002305. [PMID: 21980306 PMCID: PMC3183076 DOI: 10.1371/journal.pgen.1002305] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 08/05/2011] [Indexed: 11/18/2022] Open
Abstract
Meiotic DNA double-strand breaks (DSBs) initiate crossover (CO) recombination, which is necessary for accurate chromosome segregation, but DSBs may also repair as non-crossovers (NCOs). Multiple recombination pathways with specific intermediates are expected to lead to COs and NCOs. We revisited the mechanisms of meiotic DSB repair and the regulation of CO formation, by conducting a genome-wide analysis of strand-transfer intermediates associated with recombination events. We performed this analysis in a SK1 × S288C Saccharomyces cerevisiae hybrid lacking the mismatch repair (MMR) protein Msh2, to allow efficient detection of heteroduplex DNAs (hDNAs). First, we observed that the anti-recombinogenic activity of MMR is responsible for a 20% drop in CO number, suggesting that in MMR-proficient cells some DSBs are repaired using the sister chromatid as a template when polymorphisms are present. Second, we observed that a large fraction of NCOs were associated with trans-hDNA tracts constrained to a single chromatid. This unexpected finding is compatible with dissolution of double Holliday junctions (dHJs) during repair, and it suggests the existence of a novel control point for CO formation at the level of the dHJ intermediate, in addition to the previously described control point before the dHJ formation step. Finally, we observed that COs are associated with complex hDNA patterns, confirming that the canonical double-strand break repair model is not sufficient to explain the formation of most COs. We propose that multiple factors contribute to the complexity of recombination intermediates. These factors include repair of nicks and double-stranded gaps, template switches between non-sister and sister chromatids, and HJ branch migration. Finally, the good correlation between the strand transfer properties observed in the absence of and in the presence of Msh2 suggests that the intermediates detected in the absence of Msh2 reflect normal intermediates.
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Affiliation(s)
- Emmanuelle Martini
- CEA DSV/IRCM, Unité Mixte de Recherche 217 Radiobiologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Fontenay aux Roses, France
| | - Valérie Borde
- Unité Mixte de Recherche 218, Centre National de la Recherche Scientifique, Paris, France
- Centre de Recherche, Institut Curie, Paris, France
| | - Matthieu Legendre
- Unité Propre de recherche 2589, Structural and Genomic Information Laboratory, Centre National de la Recherche Scientifique, Mediterranean Institute of Microbiology IFR88, Aix-Marseille University, Parc Scientifique de Luminy, Marseille, France
| | - Stéphane Audic
- Unité Propre de recherche 2589, Structural and Genomic Information Laboratory, Centre National de la Recherche Scientifique, Mediterranean Institute of Microbiology IFR88, Aix-Marseille University, Parc Scientifique de Luminy, Marseille, France
- UMR 7144, Adaptation et Diversité en Milieu Marin, Equipe Evolution du Plancton et Paléo-Océans, Station Biologique de Roscoff, Centre National de la Recherche Scientifique and University Pierre and Marie Curie-Paris, Roscoff, France
| | | | | | - Bernard Dujon
- Unité de Génétique Moléculaire des Levures, Institut Pasteur, Centre National de la Recherche Scientifique/University Pierre and Marie Curie-Paris, Paris, France
| | - Bertrand Llorente
- Unité de Génétique Moléculaire des Levures, Institut Pasteur, Centre National de la Recherche Scientifique/University Pierre and Marie Curie-Paris, Paris, France
- Unité Propre de Recherche 3081, Laboratory of Genome Instability and Carcinogenesis, conventionné par l'Université d'Aix-Marseille 2, Centre National de la Recherche Scientifique, Marseille, France
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Suzuki G. Recent progress in plant reproduction research: the story of the male gametophyte through to successful fertilization. PLANT & CELL PHYSIOLOGY 2009; 50:1857-64. [PMID: 19825944 DOI: 10.1093/pcp/pcp142] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Sexual reproduction is an important biological event not only for evolution but also for breeding in plants. It is a well known fact that Charles Darwin (1809-1882) was interested in the reproduction system of plants as part of his concept of 'species' and 'evolution.' His keen observation and speculation is timeless even in the current post-genome era. In the Darwin anniversary year of 2009, I have summarized recent molecular genetic studies of plant reproduction, focusing especially on male gametophyte development, pollination and fertilization. We are just beginning to understand the molecular mechanisms of the elaborate reproduction system in flowering plants, which have been a mystery for >100 years.
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Affiliation(s)
- Go Suzuki
- Division of Natural Science, Osaka Kyoiku University, Kashiwara, 582-8582 Japan.
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