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Journal of Cell Science, Vol 113, Issue 19 3419-3426, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
I Siden-Kiamos, D Vlachou, G Margos, A Beetsma, AP Waters, RE Sinden and C Louis
Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Crete, Greece.
We have developed an in vitro culture system for early sporogonic stages of Plasmodium berghei, which can be used to study developmental events normally taking place in the midgut of an infected mosquito. These include penetration of insect cells by the mature ookinete, transformation into oocysts and the early development of the latter, sustained through several rounds of nuclear division. The system, based upon co-culture of enriched ookinetes with several established insect cell lines, was used to study the development of mutant ookinetes lacking both the Pbs21 and Pbs25 surface proteins. Motility and entry of double knockout and Pbs21 single knockout ookinetes into the insect cells are normal, but the number of ookinetes successfully transforming into oocysts expressing the CSP protein are substantially reduced. Finally, using the yeast two-hybrid system we also show that Pbs25 has the capacity to homodimerise as well as to form heterodimers with Pbs21.
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