article published yes Nicolas Christophorou author Wenjing She author Jincheng Long author Aurélie Hurel author Sébastien Beaubiat author Yassir Idir author Marina Tagliaro-Jahns author Aurélie Chambon author Victor Solier author Daniel Vezon author Mathilde Grelon author Xiaoqi Feng author e0164712-22ee-11ed-b12a-d80fcdf359580000-0002-4008-1234 Nicolas Bouché author Christine Mézard author XiFe department Meiotic crossovers (COs) are important for reshuffling genetic information between homologous chromosomes and they are essential for their correct segregation. COs are unevenly distributed along chromosomes and the underlying mechanisms controlling CO localization are not well understood. We previously showed that meiotic COs are mis-localized in the absence of AXR1, an enzyme involved in the neddylation/rubylation protein modification pathway in Arabidopsis thaliana. Here, we report that in axr1-/-, male meiocytes show a strong defect in chromosome pairing whereas the formation of the telomere bouquet is not affected. COs are also redistributed towards subtelomeric chromosomal ends where they frequently form clusters, in contrast to large central regions depleted in recombination. The CO suppressed regions correlate with DNA hypermethylation of transposable elements (TEs) in the CHH context in axr1-/- meiocytes. Through examining somatic methylomes, we found axr1-/- affects DNA methylation in a plant, causing hypermethylation in all sequence contexts (CG, CHG and CHH) in TEs. Impairment of the main pathways involved in DNA methylation is epistatic over axr1-/- for DNA methylation in somatic cells but does not restore regular chromosome segregation during meiosis. Collectively, our findings reveal that the neddylation pathway not only regulates hormonal perception and CO distribution but is also, directly or indirectly, a major limiting pathway of TE DNA methylation in somatic cells. Public Library of Science (PLoS)2020 eng Cancer ResearchGenetics (clinical)GeneticsMolecular BiologyEcologyEvolutionBehavior and Systematics 1553-7404 3259834010.1371/journal.pgen.1008894 166 yes Christophorou N, She W, Long J, Hurel A, Beaubiat S, Idir Y, Tagliaro-Jahns M, Chambon A, Solier V, Vezon D, Grelon M, Feng X, Bouché N, Mézard C. 2020. AXR1 affects DNA methylation independently of its role in regulating meiotic crossover localization. PLOS Genetics. 16(6), e1008894. Christophorou, Nicolas, et al. “AXR1 Affects DNA Methylation Independently of Its Role in Regulating Meiotic Crossover Localization.” <i>PLOS Genetics</i>, vol. 16, no. 6, e1008894, Public Library of Science (PLoS), 2020, doi:<a href="https://doi.org/10.1371/journal.pgen.1008894">10.1371/journal.pgen.1008894</a>. Christophorou, Nicolas, Wenjing She, Jincheng Long, Aurélie Hurel, Sébastien Beaubiat, Yassir Idir, Marina Tagliaro-Jahns, et al. “AXR1 Affects DNA Methylation Independently of Its Role in Regulating Meiotic Crossover Localization.” <i>PLOS Genetics</i>. Public Library of Science (PLoS), 2020. <a href="https://doi.org/10.1371/journal.pgen.1008894">https://doi.org/10.1371/journal.pgen.1008894</a>. N. Christophorou, W. She, J. Long, A. Hurel, S. Beaubiat, Y. Idir, M. Tagliaro-Jahns, A. Chambon, V. Solier, D. Vezon, M. Grelon, X. Feng, N. Bouché, C. Mézard, PLOS Genetics 16 (2020). Christophorou, N., She, W., Long, J., Hurel, A., Beaubiat, S., Idir, Y., … Mézard, C. (2020). AXR1 affects DNA methylation independently of its role in regulating meiotic crossover localization. <i>PLOS Genetics</i>. Public Library of Science (PLoS). <a href="https://doi.org/10.1371/journal.pgen.1008894">https://doi.org/10.1371/journal.pgen.1008894</a> N. Christophorou <i>et al.</i>, “AXR1 affects DNA methylation independently of its role in regulating meiotic crossover localization,” <i>PLOS Genetics</i>, vol. 16, no. 6. Public Library of Science (PLoS), 2020. Christophorou N, She W, Long J, et al. AXR1 affects DNA methylation independently of its role in regulating meiotic crossover localization. <i>PLOS Genetics</i>. 2020;16(6). doi:<a href="https://doi.org/10.1371/journal.pgen.1008894">10.1371/journal.pgen.1008894</a> 121892023-01-16T09:16:10Z2023-05-08T10:54:39Z