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Development, Vol 121, Issue 12 4371-4382, Copyright © 1995 by Company of Biologists
JOURNAL ARTICLES |
M Fujioka, JB Jaynes and T Goto
Jefferson Cancer Institute, Thomas Jefferson University, Philadelphia, PA 19107, USA.
even-skipped (eve) has been proposed to set up parasegment borders at the anterior edge of each of its seven stripes by providing a sharp expression boundary, where engrailed is activated on one side and wingless on the other. By expressing bell-shaped early eve stripes without the sharp boundary provided by narrow, late stripes, we find that the early gradient is sufficient for generating stable parasegment borders. Based on several lines of evidence, we propose that the anterior portion of each early stripe has morphogenic activity, repressing different target genes at different concentrations. These distinct repression thresholds serve to both limit and subdivide a narrow zone of paired expression. Within this zone, single cell rows express either engrailed, where runt and sloppy-paired are repressed, or wingless, where they are not. While the early eve gradient is sufficient to establish parasegmental borders without refined, late expression, late eve expression has a role in augmenting this boundary to provide for strong, continuous stripes or engrailed expression. In addition, we show that the early eve gradient is sufficient, at its posterior edge, for subdividing the ftz domain into engrailed expressing and non-expressing cells.
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A Vincent, J. Blankenship, and E Wieschaus Integration of the head and trunk segmentation systems controls cephalic furrow formation in Drosophila Development, January 10, 1997; 124(19): 3747 - 3754. [Abstract] [PDF]
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V Riechmann, U Irion, R Wilson, R Grosskortenhaus, and M Leptin Control of cell fates and segmentation in the Drosophila mesoderm Development, January 8, 1997; 124(15): 2915 - 2922. [Abstract] [PDF]
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B Florence, A Guichet, A Ephrussi, and A Laughon Ftz-F1 is a cofactor in Ftz activation of the Drosophila engrailed gene Development, January 2, 1997; 124(4): 839 - 847. [Abstract] [PDF]
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S. Smith and J. Jaynes A conserved region of engrailed, shared among all en-, gsc-, Nk1-, Nk2- and msh-class homeoproteins, mediates active transcriptional repression in vivo Development, January 10, 1996; 122(10): 3141 - 3150. [Abstract] [PDF]
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M Fujioka, P Miskiewicz, L Raj, A. Gulledge, M Weir, and T Goto Drosophila Paired regulates late even-skipped expression through a composite binding site for the paired domain and the homeodomain Development, January 9, 1996; 122(9): 2697 - 2707. [Abstract] [PDF]
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P Miskiewicz, D Morrissey, Y Lan, L Raj, S Kessler, M Fujioka, T Goto, and M Weir Both the paired domain and homeodomain are required for in vivo function of Drosophila Paired Development, January 9, 1996; 122(9): 2709 - 2718. [Abstract] [PDF]
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