Development, Vol 118, Issue 2 353-362, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

Two distinct populations of prestalk cells within the tip of the migratory Dictyostelium slug with differing fates at culmination

AE Early, MJ Gaskell, D Traynor and JG Williams
Imperial Cancer Research Fund, Clare Hill Laboratories, South Mimms, Herts, UK.

The ecmA gene of Dictyostelium encodes an extracellular matrix protein and is selectively expressed in prestalk cells. We show that its promoter contains discrete elements that direct expression in different subpopulations of prestalk cells. Prestalk(pst)A cells occupy the front half of the prestalk region. Expression in pstA cells requires DNA sequences close to the cap site of the gene and a separate, upstream region that acts in combination with the gene proximal sequences. PstO cells are situated in the rear half of the prestalk region and at least two separate and redundant promoter regions direct expression within them. All constructs that are expressed in pstO cells are also expressed in anterior-like cells (ALCs); cells that resemble prestalk cells but which are scattered throughout the prespore region. This observation suggests that pstO cells and ALCs may be very similar in their properties. If development occurs under conditions in which a migratory slug is not formed, there is an ordered movement of cells into the stalk tube. PstA cells enter the stalk tube first, followed by a proportion of the pstO cells. The remainder of the pstO cells contribute to the upper cup, an ALC-derived subpopulation of prestalk cells which is located at the apex of the spore head. After prolonged slug migration, a discrete pstO zone appears not to be maintained and, at culmination, pstO cells are found scattered throughout the stalk.

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