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The nuclear protein PfMORC displays a histidine kinase domain and is involved in parasite cell cycle control. By using a real-time assay, we show a 24\u00a0h (h) rhythmic expression of PfMORC at the parasite asexual cycle and the expression is dramatically changed when parasites were treated with 100\u00a0nM melatonin for 17\u00a0h. Moreover, PfMORC expression was severely affected in PfPK7 knockout (PfPK7<jats:sup>\u2212<\/jats:sup>) parasites following melatonin treatment. Parasites expressing 3D7<jats:sup><jats:italic>morc-GFP<\/jats:italic><\/jats:sup> shows nuclear localization of the protein during the asexual stage of parasite development. Although the PfMORC knockdown had no significant impact on the parasite proliferation in vitro it significantly changed the ratio of the different asexual intraerythrocytic stages of the parasites upon the addition of melatonin. Our data reveal that in addition to the upstream melatonin signaling pathways such as IP<jats:sub>3<\/jats:sub> generation, calcium, and cAMP rise, a nuclear protein, PfMORC is essential for the hormone response in parasite synchronization.<\/jats:p>","DOI":"10.1038\/s41598-021-81235-2","type":"journal-article","created":{"date-parts":[[2021,1,21]],"date-time":"2021-01-21T11:03:39Z","timestamp":1611227019000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["A nuclear protein, PfMORC confers melatonin dependent synchrony of the human malaria parasite P. falciparum in the asexual stage"],"prefix":"10.1038","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1474-4695","authenticated-orcid":false,"given":"Maneesh K.","family":"Singh","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giulliana","family":"Tessarin-Almeida","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barbara K. 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