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Characterization of a Meiotic Recombination Hotspot in Arabidopsis Thaliana Hossein Khademian

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Characterization of a meiotic recombination hotspot in Arabidopsis thaliana Hossein Khademian To cite this version: Hossein Khademian. Characterization of a meiotic recombination hotspot in Arabidopsis thaliana. Agricultural sciences. Université Paris Sud - Paris XI, 2012. English. NNT : 2012PA112051. tel- 00800551 HAL Id: tel-00800551 https://tel.archives-ouvertes.fr/tel-00800551 Submitted on 14 Mar 2013 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. UNIVERSITE PARIS-SUD 11 U.F.R. Scientifique d’Orsay Thèse Présentée pour l’obtention du grade de Docteur en Sciences de l’Université Paris-Sud XI Spécialité : Sciences du Végétal par Hossein KHADEMIAN Caractérisation d’un point chaud de recombinaison méiotique chez Arabidopsis thaliana Composition du jury : Valérie BORDE Rapporteur Michel DRON Président du Jury Corinne GREY Examinateur Christine MEZARD Directeur de Thèse Minoo RASSOULZADEGAN Rapporteur Abstract Meiotic recombination initiated in prophase I of meiosis generates either crossovers (COs), which are reciprocal exchanges between chromosome segments, or gene conversion not associated to crossovers (NCOs). Both kinds of events occur in narrow regions (less than 10 kilobases) called hotspots, which are distributed non-homogenously along chromosomes. The aim of my PhD was the characterization of a hotspot of meiotic recombination (named 14a) in Arabidopsis thaliana (i) across different accessions (ii) in msh4 mutant, a gene involved in CO formation. In both ColxLer and ColxWs hybrids (i) 14a had a very high rate of COs 0.85% and 0.49%, respectively (ii) COs clustered in two small regions of a few kilobases, 14a1 and 14a2 with typical Gaussian curve distribution observed in other organisms (iii) 14a1 was also a hotspot of NCO with high rate (0.5%) in ColxLer (iv) a bias of recombination initiation at 14a1 CO and NCO hotspot was found in ColxLer. A reduction of CO frequency was observed in msh4 mutant in ColxLer background at 14a1 (6.4%) and 14a2 (18.7%) compared to wild type. This confirmed previously known role of MSH4 protein in CO formation. Frequency of NCO at 14a1 was similar to wild type. The role of putative Arabidopsis histone H3K4 trimethyltransferase in meiotic recombination as previously observed like Set1 in S.cerevisiae or PRDM9 in mammals (mice and human) was also studied. None of ten putative histone methyltransferase genes was involved in meiosis. This could be due to (i) a strong redundancy of function between gene products (ii) another histone methyltransferase in charge of labeling meiotic recombination hotspots (more than 29 putative histone methyltransferase have been identified in the Arabidopsis genome!) (iii) contrary to S. cerevisiae, mice and humans, another mechanism for epigenetic control of meiotic recombination. Résumé La recombinaison méiotique initiée en prophase I de méiose génère soit des crossing-over (COs), qui sont des échanges réciproques entre segments chromosomiques, ou des conversions géniques non associées aux COs (NCOs). Les deux types d'événements se produisent dans de petites régions (moins de 10 kilobases) appelées points chauds, qui sont distribuées de manière non homogène le long des chromosomes. L'objectif de ma thèse était la caractérisation d'un point chaud de recombinaison méiotique (nommée 14a) chez Arabidopsis thaliana (i) dans différentes accessions (ii) dans le mutant msh4, un gène impliqué dans la formation des COs. Dans les deux hybrides ColxLer et ColxWs (i) 14a a un taux très élevé de COs 0,85% et 0,49%, respectivement (ii) Les COs sont regroupés dans deux petites régions de quelques kilobases, 14a1 et 14a2 avec une distribution de type gaussienne observée aux points chauds décrits dans d'autres espèces (iii) 14a1 est aussi un point chaud de NCO avec un taux aussi élevé que celui des COs (0,5%) dans ColxLer (iv) un biais de l'initiation de recombinaison a été trouvé dans 14a1 aussi bien pour les COs que les NCOs dans le fond génétique ColxLer. Une réduction de la fréquence de CO a été observée dans le mutant msh4 dans le fond génétique ColxLer à 14a1 et 14a2 (6,4% et 18,7% par rapport au sauvage). Cela confirme le rôle précédemment connu de la protéine MSH4 impliqué dans la formation de CO. La fréquence de NCO à 14a1 est similaire à celle observéedans le fond sauvage. Le rôle des H3K4 histones trimethyltransferase d’Arabidopsis dans la recombinaison méiotique (comme précédemment observé comme Set1 chez S. cerevisiae ou PRDM9 chez les mammifères) a également été étudiée. Aucun des dix gènes d’histones méthyltransférase étudié n'a montré de rôle dans la méiose. Cela pourrait être dû à (i) une forte redondance de la fonction entre les protéines (ii) une autre histone méthyltransférase en charge de l'étiquetage des points chauds de recombinaison méiotique (plus de 29 putatif histone méthyltransférase ont été identifiés dans le génome d'Arabidopsis!) (iii) contrairement à S. cerevisiae, les souris et l'homme, un autre mécanisme de contrôle épigénétique de la recombinaison méiotique. TABLE DES MATIERES INTRODUCTION................................................................................................ 3 1.1 Meiosis (general information)................................................................................4 1.1.1 A brief history of genetics.................................................................................................................................... 5 1.1.2 Meiosis as Mendel’s law key ............................................................................................................................... 6 1.2. Chronology and cytological aspects of prophase I of meiosis.................................7 1.2.1 Leptotene ............................................................................................................................................................ 8 1.2.2 Zygotene.............................................................................................................................................................. 9 I.2.3 Pachytene Stage ................................................................................................................................................. 10 I.2.4 Diplotene and Diakinesis Stages......................................................................................................................... 11 1.2. 5 Metaphase, anaphase and telophase 1............................................................................................................ 11 1.2. 6 Metaphase, anaphase and telophase 2............................................................................................................ 11 1.3 Molecular description of meiotic recombination .................................................. 12 1.3.1 Double strand breaks (DSB) forMation.............................................................................................................. 13 1.3.2 Maturation of DSBs ........................................................................................................................................... 14 1.3.3 Strand invasion.................................................................................................................................................. 15 1.3.4 Inter-homologue bias ........................................................................................................................................ 16 1.3.5 HoMologous RecoMbination Pathways............................................................................................................. 17 1.3.5.1 Type I Crossover......................................................................................................................................... 17 1.3.5.2 Type II Crossover........................................................................................................................................ 19 1.3.5.3 Non Crossover (Gene Conversion non associated with CO) ....................................................................... 19 1.3.6. What about Molecular MechanisMs of Meiotic recoMbination in Arabidopsis thaliana? ............................... 21 1.4 Distribution of Crossovers .................................................................................... 25 1.4.1 ChroMosoMal Map DeterMination of Crossover Location................................................................................ 25 1.4.2 GenoMic Map DeterMination of Crossover Location........................................................................................ 26 1.5 Distribution of DSBs ............................................................................................. 27 1.6 Meiotic Recombination Hotspots ......................................................................... 28 1.6.1 Meiotic RecoMbination Hotspots in Fungi ........................................................................................................ 29 1.6.2 Meiotic RecoMbination Hotspots in MamMals................................................................................................
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