{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,11]],"date-time":"2026-07-11T03:00:02Z","timestamp":1783738802594,"version":"3.55.0"},"reference-count":58,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2024,8,28]],"date-time":"2024-08-28T00:00:00Z","timestamp":1724803200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["31970525"],"award-info":[{"award-number":["31970525"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Advanced Foreign Experts Project","award":["G2023157014L"],"award-info":[{"award-number":["G2023157014L"]}]},{"name":"Hubei Hongshan Laboratory","award":["2022hspy002"],"award-info":[{"award-number":["2022hspy002"]}]},{"DOI":"10.13039\/501100004242","name":"Princess Nourah bint Abdulrahman University","doi-asserted-by":"crossref","award":["PNURSP2024R318"],"award-info":[{"award-number":["PNURSP2024R318"]}],"id":[{"id":"10.13039\/501100004242","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100020912","name":"King Faisal University, Saudi Arabia","doi-asserted-by":"crossref","award":["KFU241408"],"award-info":[{"award-number":["KFU241408"]}],"id":[{"id":"10.13039\/501100020912","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Meiosis is a critical process in sexual reproduction, and errors during this cell division can significantly impact fertility. Successful meiosis relies on the coordinated action of numerous genes involved in DNA replication, strand breaks, and subsequent rejoining. DNA topoisomerase enzymes play a vital role by regulating DNA topology, alleviating tension during replication and transcription. To elucidate the specific function of DNA topoisomerase 1\u03b1 ($AtTOP1 \\alpha$) in male reproductive development of <jats:italic>Arabidopsis thaliana<\/jats:italic>, we investigated meiotic cell division in Arabidopsis flower buds. Combining cytological and biochemical techniques, we aimed to reveal the novel contribution of $AtTOP1 \\alpha$ to meiosis. Our results demonstrate that the absence of $AtTOP1 \\alpha$ leads to aberrant chromatin behavior during meiotic division. Specifically, the top1\u03b11 mutant displayed altered heterochromatin distribution and clustered centromere signals at early meiotic stages. Additionally, this mutant exhibited disruptions in the distribution of 45s rDNA signals and a reduced frequency of chiasma formation during metaphase I, a crucial stage for genetic exchange. Furthermore, the atm-2\u00d7top1\u03b11 double mutant displayed even more severe meiotic defects, including incomplete synapsis, DNA fragmentation, and the presence of polyads. These observations collectively suggest that $AtTOP1 \\alpha$ plays a critical role in ensuring accurate meiotic progression, promoting homologous chromosome crossover formation, and potentially functioning in a shared DNA repair pathway with ATAXIA TELANGIECTASIA MUTATED (ATM) in Arabidopsis microspore mother cells.<\/jats:p>","DOI":"10.7717\/peerj.17864","type":"journal-article","created":{"date-parts":[[2024,8,28]],"date-time":"2024-08-28T06:01:16Z","timestamp":1724824876000},"page":"e17864","source":"Crossref","is-referenced-by-count":5,"title":["The role of DNA topoisomerase 1\u03b1 (AtTOP1\u03b1) in regulating arabidopsis meiotic recombination and chromosome segregation"],"prefix":"10.7717","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6524-7264","authenticated-orcid":true,"given":"Ibrahim Eid","family":"Elesawi","sequence":"first","affiliation":[{"name":"College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 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