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An activity-regulated transcriptional program directly drives synaptogenesis.

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Researchers discovered that EGL-43 and FOS-1 control synapse formation by activating synaptic genes in C. elegans neurons. These factors are crucial for presynaptic protein expression and overall synaptic function during development.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Synaptic molecular composition and architecture are well-studied.
  • Genetic programs controlling synaptic gene expression and modulation remain less understood.

Purpose of the Study:

  • To identify genetic programs that activate synaptic gene expression.
  • To understand the modulation of these programs in activity-dependent synaptogenesis.

Main Methods:

  • Utilized Caenorhabditis elegans dopaminergic neurons.
  • Investigated the roles of EGL-43/MECOM and FOS-1/FOS transcription factors.
  • Performed promoter binding assays and gene expression analysis.

Main Results:

  • EGL-43 and FOS-1 control an activity-dependent synaptogenesis program.
  • Loss of EGL-43 or FOS-1 significantly reduces presynaptic protein expression.
  • Both factors directly bind to synaptic gene promoters and co-activate transcription with CUT homeobox factors.
  • egl-43 and fos-1 mutually regulate each other's expression.
  • Enhanced FOS-1 binding to the egl-43 locus increases presynaptic protein and synaptic function.
  • EGL-43 regulates various transcription factors, including activity-regulated and developmental factors, defining dopaminergic identity.

Conclusions:

  • A robust genetic program involving EGL-43 and FOS-1 underlies activity-regulated synapse formation during development.
  • This program is essential for establishing and maintaining presynaptic protein expression and synaptic function.