Abstract
It is very likely that oscillatory cAMP secretion and cAMP relay organize postaggregative cell movement in the cellular slime molds. We present evidence indicating that cAMP signaling may also be involved in the formation of the prestalk/prespore pattern in slugs of Dictyostelium discoideum. Reduction of cAMP relay in slugs caused by caffeine increased the proportion of prespore tissue. An even stronger increase was observed in a mutant with a very low CAMP-relay response. The effects on pattern resulting from a reduction of cAMP relay are not due to a reduction in the amount of cAMP in the slug, but to an as yet undefined property of oscillatory cAMP signaling.
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