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The protozoan parasites Leishmania, Trypanosoma cruzi and Trypanosoma brucei show multiple features consistent with a form of programmed cell death (PCD). Despite some similarities with apoptosis of mammalian cells, PCD in trypanosomatid protozoans appears to be significantly different. In these unicellular organisms, PCD could represent an altruistic mechanism for the selection of cells, from the parasite population, that are fit to be transmitted to the next host. Alternatively, PCD could help in controlling the population of parasites in the host, thereby increasing host survival and favoring parasite transmission, as proposed by Seed and Wenk. Therefore, PCD in trypanosomatid parasites may represent a pathway involved both in survival and propagation of the species

Programmed cell death in trypanosomatids: is it an altruistic mechanism for survival of the fittest?