Abstract
Folic acid pulses induced developmental processes in agip 71, a morphogenetic mutant of Dictyostelium discoideum, strain Ax-2. Cells that had received folic acid pulses were able to form EDTA-stable cell aggregates and to complete full differentiation to fruiting bodies. In these cells no autonomous periodic activities were observed by light scattering. Folic acid pulses elicited increases in the concentrations of cyclic GMP and cyclic AMP. In undifferentiated cells, folic acid caused a rapid increase in the level of cyclic GMP without a significant change in the level of cyclic AMP. In an advanced developmental state folic acid caused an increase in cyclic AMP in addition to two successive peaks of cyclic GMP. Experiments performed with the parent strain, Ax-2, also showed that during the development towards aggregation competence, cells acquired the ability to produce a cyclic AMP peak in response to folic acid.
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