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Related Experiment Videos

Complex regulatory region mediating tailless expression in early embryonic patterning and brain development

K M Rudolph1, G J Liaw, A Daniel

  • 1Department of Molecular, Cell and Developmental Biology, UCLA, Los Angeles, CA 90095-1606, USA.

Development (Cambridge, England)
|October 23, 1997
PubMed
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The tailless gene is crucial for embryonic development, regulating both posterior structures and the anterior brain. Its complex expression pattern is controlled by specific DNA regulatory elements.

Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • The tailless (tll) gene encodes a transcription factor essential for embryonic development in Drosophila.
  • tll exhibits distinct expression domains, including early posterior pole expression and later anterior brain expression.
  • Understanding the regulation of these domains is key to deciphering tll's role in pattern formation.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling the spatial and temporal expression of the tailless gene during embryogenesis.
  • To identify specific DNA elements responsible for mediating different aspects of tailless expression.
  • To elucidate the functional significance of tailless expression in neurogenesis.

Main Methods:

  • Detailed analysis of tailless expression patterns in embryonic brain neuroblasts.

Related Experiment Videos

  • Functional analysis of approximately 6 kb of upstream regulatory DNA using lacZ reporter assays.
  • Identification and characterization of cis-regulatory modules within the upstream sequence.

    • Main Results:

    • Tailless expression in brain neuroblasts is not regulated by known head gap or proneural genes.
    • A 6 kb upstream DNA sequence recapitulates the full embryonic expression pattern of tailless.
    • Multiple cis-regulatory modules within this sequence control distinct aspects of tailless expression, including posterior pole, general brain, dorsal medial brain, optic lobe, and neuroblast-specific repression.

    Conclusions:

    • The complex expression pattern of tailless is achieved through the combinatorial action of multiple regulatory modules.
    • Specific DNA regions mediate distinct expression domains, highlighting a modular control mechanism for this crucial transcription factor.
    • These findings provide insights into the intricate regulation of gene expression during early embryonic development and neurogenesis.