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Exposure of monolayer Dictyostelium cells to the signalling polyketide DIF-1 causes DimB, a bZIPtranscription factor, to accumulate in the nucleus where it induces prestalk gene expression. Here we analyse DimB signalling during normal development. In slugs DimB is specifically nuclear enriched in the pstB cells; a cluster of vital dye-staining cells located on the ventral surface of the posterior,...
We have isolated a Dictyostelium mutant unable to induce expression of the prestalk-specific marker ecmB in monolayer assays. The disrupted gene, padA, leads to a range of phenotypic defects in growth and development. We show that padA is essential for growth, and we have generated a thermosensitive mutant allele, padA − . At the permissive temperature, mutant cells grow poorly; they remain...
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