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Related Experiment Videos

Exploring the homeobox

W J Gehring1

  • 1Biozentrum, University of Basel, Switzerland.

Gene
|December 15, 1993
PubMed
Summary
This summary is machine-generated.

Homeotic mutations in Drosophila reveal master regulator genes controlling body plan development. These genes, identified by the homeobox, demonstrate conserved genetic control of body plan across species like mice.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Homeotic mutations in Drosophila alter body segment identity.
  • These mutations identify master regulator genes controlling antero-posterior axis specification.
  • The homeobox DNA sequence is characteristic of homeotic genes, encoding the homeodomain DNA-binding region.

Purpose of the Study:

  • To investigate the role of homeotic genes in specifying segmental identity.
  • To explore the conserved nature of genetic control over body plan development.
  • To elucidate the structural basis of homeodomain-DNA interactions.

Main Methods:

  • Analysis of dominant gain and recessive loss-of-function mutations in Drosophila.
  • Cloning of homologous Hox genes in vertebrates using the homeobox as a probe.

Related Experiment Videos

  • Expression of Antennapedia (Antp) cDNA in transgenic flies to alter body plan.
  • Nuclear magnetic resonance (NMR) spectroscopy to determine the structure of the Antp homeodomain-DNA complex.

    • Main Results:

    • Homeotic mutations cause predictable segmental transformations in Drosophila.
    • Vertebrate Hox genes show functional conservation, partially substituting Drosophila genes in transgenic flies.
    • The Antp homeodomain structure reveals a helix-turn-helix motif and a flexible N-terminal arm crucial for DNA binding.

    Conclusions:

    • The genetic control of body plan development is highly conserved across diverse species, from Drosophila to vertebrates.
    • Homeodomain proteins act as transcriptional regulators essential for specifying the body plan.
    • Structural studies provide insights into the molecular mechanisms of homeodomain-DNA recognition.