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Related Experiment Videos

buttonhead does not contribute to a combinatorial code proposed for Drosophila head development

E A Wimmer1, S M Cohen, H Jäckle

  • 1Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10021-6399, USA.

Development (Cambridge, England)
|April 1, 1997
PubMed
Summary
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Drosophila head development relies on segmentation genes like buttonhead (btd). Misexpressing btd in early embryos rescues mutant defects, showing its expression limits aren't instructive for head segmentation or identity codes.

Area of Science:

  • Developmental biology
  • Genetics
  • Molecular biology

Background:

  • Drosophila gap-like segmentation genes, including orthodenticle, empty spiracles, and buttonhead (btd), are crucial for head region development.
  • These genes are expressed in overlapping domains, suggesting roles in head metamerization and combinatorial segment identity specification.

Purpose of the Study:

  • To investigate the role of buttonhead (btd) gene expression boundaries in Drosophila head segmentation.
  • To determine if btd activity contributes to a combinatorial code for specifying segment identity in the head region.

Main Methods:

  • Development of a targeted gene expression system using region-specific promoters and the flp-out system in early Drosophila embryos.
  • Misexpression of the buttonhead (btd) gene in the anterior blastoderm using the hunchback proximal promoter.

Related Experiment Videos

Main Results:

  • Ectopic expression of buttonhead (btd) in the anterior half of the blastoderm embryo rescued the btd mutant head phenotype to wild-type.
  • The spatial limits of btd expression were found not to be instructive for head region metamerization.

Conclusions:

  • Buttonhead (btd) gene activity is essential for specific head segment formation but does not instruct metamerization.
  • Btd activity does not contribute to a combinatorial code for specifying segment identity in the Drosophila head.