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Development, Vol 116, Issue 1 11-20, Copyright © 1992 by Company of Biologists

JOURNAL ARTICLES

Development of the D. melanogaster caudal segments involves suppression of the ventral regions of A8, A9 and A10

DT Kuhn, M Sawyer, G Packert, G Turenchalk, JA Mack, TE Sprey, E Gustavson and TB Kornberg
Department of Biology, University of Central Florida, Orlando 32816.

Whereas the segmental organization of the thorax and anterior abdomen is morphologically delineated in both the Drosophila larva and adult, segments in the head and caudal regions lack such well-defined boundaries. Consequently, the organization of these regions has been difficult to decipher. In this study, transformations caused by the bithorax-complex homeotic mutants 48, M3, Ultraabdominal-1 (Uab1) and tumorous-head-3 (tuh-3), as well as the patterns of engrailed gene expression have been analyzed to investigate the segmental organization of the caudal segments. A special emphasis was placed on sense organs appearing in abdominal segments 8, 9 and 10 (A8-A10): We find that: (1) transformations in the caudal segments obey parasegmental borders; (2) the sense organs on A8, A9, and A10 are probably homologous to the pits and hairs in anterior A1-A7; (3) except for the larval anal tuft and the anterior side of A8, all structures in larval segments A8, A9 and A10 are dorsal/lateral in origin; and (4) dorsalization of embryonic A8 and A9 cells leaves space ventrally for A10, as it follows the contracting ventral nervous system during the embryological process of germ band contraction.
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© The Company of Biologists Ltd 1992