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Title: Plasmodium P-Type Cyclin CYC3 Modulates Endomitotic Growth During Oocyst Development in Mosquitoes.
Authors: Roques, Magali
Wall, Richard J.
Douglass, Alexander P.
Ramaprasad, Abhinay
Ferguson, David J.P.
Kaindama, Mbinda L.
Brusini, Lorenzo
Joshi, Nimitray
Rchiad, Zineb
Brady, Declan
Guttery, David S.
Wheatley, Sally P.
Yamano, Hiroyuki
Holder, Anthony A.
Pain, Arnab
Wickstead, Bill
Tewari, Rita
First Published: 13-Nov-2015
Publisher: Public Library of Science
Citation: PLoS Pathogens, 2015, 11 (11), e1005273
Abstract: Cell-cycle progression and cell division in eukaryotes are governed in part by the cyclin family and their regulation of cyclin-dependent kinases (CDKs). Cyclins are very well characterised in model systems such as yeast and human cells, but surprisingly little is known about their number and role in Plasmodium, the unicellular protozoan parasite that causes malaria. Malaria parasite cell division and proliferation differs from that of many eukaryotes. During its life cycle it undergoes two types of mitosis: endomitosis in asexual stages and an extremely rapid mitotic process during male gametogenesis. Both schizogony (producing merozoites) in host liver and red blood cells, and sporogony (producing sporozoites) in the mosquito vector, are endomitotic with repeated nuclear replication, without chromosome condensation, before cell division. The role of specific cyclins during Plasmodium cell proliferation was unknown. We show here that the Plasmodium genome contains only three cyclin genes, representing an unusual repertoire of cyclin classes. Expression and reverse genetic analyses of the single Plant (P)-type cyclin, CYC3, in the rodent malaria parasite, Plasmodium berghei, revealed a cytoplasmic and nuclear location of the GFP-tagged protein throughout the lifecycle. Deletion of cyc3 resulted in defects in size, number and growth of oocysts, with abnormalities in budding and sporozoite formation. Furthermore, global transcript analysis of the cyc3-deleted and wild type parasites at gametocyte and ookinete stages identified differentially expressed genes required for signalling, invasion and oocyst development. Collectively these data suggest that cyc3 modulates oocyst endomitotic development in Plasmodium berghei.
DOI Link: 10.1371/journal.ppat.1005273
ISSN: 1553-7366
eISSN: 1553-7374
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2015. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Cancer Studies and Molecular Medicine

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