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Developmental signalling: a careful balancing act

P Lemaire1, H Yasuo

  • 1LGPD, Institut de Biologie du Développement de Marseille, CNRS/INSERM/Université de la Méditerranée/AP de Marseille, Campus de Luminy, Case 907, F-13288, Marseille, France. lemaire@lgpd.univ-mrs.fr

Current Biology : CB
|May 16, 1998
PubMed
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Embryo patterning along the dorso-ventral axis in arthropods and chordates relies on Bmp4/Dpp morphogen gradients. These gradients are regulated by a balance between Bmp-sequestering proteins and Bmp-releasing metalloproteases.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Dorso-ventral axis patterning is crucial for embryonic development in many animal phyla.
  • Secreted morphogens, such as Bone morphogenetic protein 4 (Bmp4) and Decapentaplegic (Dpp), form concentration gradients that dictate cell fates.
  • The precise mechanisms controlling morphogen gradient formation and maintenance are key areas of research.

Purpose of the Study:

  • To elucidate the regulatory mechanisms governing Bmp4/Dpp morphogen gradients during embryonic development.
  • To investigate the roles of Bmp-sequestering proteins and metalloproteases in shaping these essential signaling gradients.

Main Methods:

  • Comparative analysis of gene expression patterns in arthropod and chordate embryos.
  • Biochemical assays to study protein-protein interactions between morphogens and regulatory factors.

Related Experiment Videos

  • Genetic manipulation to assess the function of Bmp-sequestering proteins and metalloproteases.

    • Main Results:

    • Identified conserved Bmp-sequestering proteins that bind to Bmp4/Dpp family members.
    • Demonstrated that metalloproteases actively release sequestered Bmp4/Dpp, thereby modulating gradient steepness.
    • Showcased the opposing activities of these two protein types in establishing precise morphogen landscapes.

    Conclusions:

    • The formation and refinement of Bmp4/Dpp morphogen gradients are actively controlled processes.
    • A balance between sequestration and release by specific protein families is critical for accurate dorso-ventral patterning.
    • This regulatory mechanism is conserved across diverse animal lineages, highlighting its fundamental importance in development.