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Dissecting the temporal requirements for homeotic gene function

J Castelli-Gair1, S Greig, G Micklem

  • 1Wellcome/CRC Institute, Cambridge, UK.

Development (Cambridge, England)
|July 1, 1994
PubMed
Summary
This summary is machine-generated.

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Transient homeotic gene expression in Drosophila can irreversibly alter cell fates, like spiracle primordia development. Competition among bithorax complex proteins also influences downstream target regulation.

Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Homeotic genes are crucial for segment identity in Drosophila.
  • These genes are expressed broadly throughout development.

Purpose of the Study:

  • To investigate the temporal requirements of homeotic genes for specific developmental events.
  • To understand the impact of transient homeotic gene expression on cell fate determination.

Main Methods:

  • Utilized the GAL4 targeting technique to express Ultrabithorax, abdominal-A, and Abdominal-Bm proteins at specific developmental times.
  • Observed the effects of this expression on larval epidermis and other cell types, including peripheral nervous system cells and spiracle primordia.

Main Results:

Related Experiment Videos

  • Early, transient expression of homeotic genes did not permanently affect larval epidermis differentiation.
  • Irreversible switching of cell fates, such as in spiracle primordia, was observed.
  • A specific peripheral nervous system cell type exhibited sequential, independent responses to homeotic gene expression.
  • Evidence suggests in vivo competition between bithorax complex proteins for regulating downstream targets.

Conclusions:

  • The timing of homeotic gene expression is critical for determining specific cell fates.
  • Homeotic gene function involves complex interactions, including protein competition, to regulate developmental processes.