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Related Experiment Videos

Characterization of downstream elements in a Raf-1 pathway

G J Liaw1, E Steingrimsson, F Pignoni

  • 1Department of Biology, University of California, Los Angeles 90024.

Proceedings of the National Academy of Sciences of the United States of America
|February 1, 1993
PubMed
Summary

Investigating the Drosophila embryo

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drumstick, bowl, and lines are required for patterning and cell rearrangement in the Drosophila embryonic hindgut.

Developmental biology·2002

Area of Science:

  • Developmental biology
  • Genetics
  • Molecular biology

Background:

  • Cell fate determination in Drosophila embryos involves a signaling pathway initiated by torso tyrosine kinase.
  • This pathway activates Drosophila Raf-1, a serine/threonine kinase, which then upregulates the tailless (tll) gene transcription.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of the tailless (tll) gene.
  • To identify conserved regulatory elements in the tll promoter region and understand their role in the signaling pathway.

Main Methods:

  • Comparative sequence analysis of tll promoter regions between Drosophila melanogaster and Drosophila virilis.
  • DNase I footprinting and promoter dissection experiments to identify regulatory elements.
  • Sequence analysis of the tll protein's DNA-binding domain.

Main Results:

  • Identified conserved elements in the tll promoter, two of which are potential targets for Raf-1-activated transcription factors.
  • Revealed conserved unique residues in the tll protein's DNA-binding domain, potentially explaining differences from retinoid/estrogen receptors.
  • Confirmed the conservation of a PEST sequence in the tll protein, correlating with its rapid turnover.

Conclusions:

  • The study defines key regulatory elements in the tll promoter targeted by the torso-Raf signaling pathway.
  • Identified conserved structural features in the tll protein's DNA-binding domain and its PEST sequence, contributing to its function and regulation.

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