Abstract
The differentiation of mammalian stage Trypanosoma brucei bloodstream forms comprising predominantly parasites of intermediate and stumpy morphology to the procyclic forms characteristic for the insect midgut stage was studied in vitro. Differentiation of the cell population occurred synchronously as judged by the synthesis of the surface glycoprotein, procyclin, characteristic of the arising procyclic forms and the loss of the membrane-form variant surface glycoprotein, the coat protein of bloodstream forms. The change in surface antigens took place within 12 h in the absence of cell growth; subsequently, the procyclic cells divided exponentially. As defined in this study, T. brucei may be a useful model to follow other changes in gene expression, metabolism or ultrastructure during differentiation of a unicellular eucaryote.
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