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Temporal and spatial pattern of dref expression during Drosophila bristle development.

Akihito Kawamori1, Kouhei Shimaji, Masamitsu Yamaguchi

  • 1Department of Applied Biology, Kyoto Institute of Technology, Sakyo-ku, Kyoto 606-8585, Japan.

Cell Structure and Function
|June 27, 2013
PubMed
Summary

The DNA replication-related element-binding factor (DREF) is crucial for cell cycle progression. This study reveals dref gene expression occurs in clusters and is temporally regulated during bristle development.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • The DNA replication-related element-binding factor (DREF) is a transcription factor vital for cell cycle progression.
  • Previous research indicated DREF's role in endoreplication during scutellar macrochaete development.
  • The dynamic expression pattern of dref within cell lineages remained unclear.

Purpose of the Study:

  • To investigate the spatio-temporal expression pattern of the dref gene during bristle development in vivo.
  • To clarify the dynamic changes in dref gene expression within specific cell lineages.

Main Methods:

  • Utilized GAL4 enhancer trap lines for dref and UAS-GFPnls to monitor gene expression.
  • Employed immunostaining techniques to analyze spatio-temporal expression patterns.

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Last Updated: May 10, 2026

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  • Determined the in vivo half-life of GFPnls to be less than 6 hours, ensuring accurate monitoring.

    • Main Results:

    • Dref expression was observed in clusters encompassing bristle cells and surrounding epidermal cells.
    • GFP signal intensity was uniform within these clusters, indicating simultaneous dref expression.
    • GFP signals peaked twice during development: at 9 and 15 hours post-pupation, coinciding with sensory organ precursor and bristle development.
    • Dref expression was minimally detected during asymmetric cell division and other developmental stages.

    Conclusions:

    • This study provides the first in vivo characterization of the spatio-temporal dref gene expression pattern.
    • Dref expression during bristle development is organized in clusters and precisely timed.
    • The findings offer insights into the regulatory mechanisms governing bristle development and cell cycle progression.