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Control of compartmental affinity boundaries by hedgehog
1Zoologisches Institut der Universität Zürich, Switzerland.
Nature
|October 23, 1997
Summary
The affinity boundary separating anterior and posterior cells in Drosophila is primarily established by Hedgehog (Hh) signaling. This finding challenges the previous view that Engrailed (En) directly dictates cell affinity.
Area of Science:
- Developmental Biology
- Genetics
- Cell Biology
Background:
- Drosophila segmental primordia are divided into anterior (A) and posterior (P) compartments.
- Engrailed (En) transcription factor activity in P cells controls Hedgehog (Hh) secretion, while A cells respond to Hh.
- Distinct cell affinities were thought to prevent A and P cell intermixing.
Purpose of the Study:
- To investigate the role of Hedgehog (Hh) signaling in establishing the affinity boundary between anterior (A) and posterior (P) cell compartments in Drosophila.
- To determine if cell affinity differences are intrinsic or induced by signaling.
Main Methods:
- Experimental manipulation of Hedgehog (Hh) signaling pathways in Drosophila.
- Analysis of cell-cell interactions and compartment segregation.
- Assessing cell affinity in response to signaling gradients.
Main Results:
- The affinity boundary segregating A and P cells is largely a consequence of local Hh signaling.
- Hedgehog (Hh) signaling in A cells induces distinct cell affinities, rather than intrinsic differences.
- The previous hypothesis of Engrailed (En) directly specifying cell affinity is challenged.
Conclusions:
- The affinity boundary between Drosophila A and P compartments is dynamically regulated by Hh signaling.
- Cellular behavior and compartment segregation are influenced by secreted signaling molecules.
- This provides a new model for understanding compartment boundary formation in developmental processes.