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Related Experiment Video

Updated: May 25, 2026

Paradigms for Pharmacological Characterization of C. elegans Synaptic Transmission Mutants
18:01

Paradigms for Pharmacological Characterization of C. elegans Synaptic Transmission Mutants

Published on: August 18, 2008

HBL-1 patterns synaptic remodeling in C. elegans.

Katherine L Thompson-Peer1, Jihong Bai, Zhitao Hu

  • 1Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA.

Neuron
|February 14, 2012
PubMed
Summary
This summary is machine-generated.

Synaptic refinement in C. elegans is controlled by the transcription factor HBL-1. Differential regulation of HBL-1 expression dictates when and where neuromuscular junction remodeling occurs during development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Synaptic plasticity and refinement are crucial for circuit development.
  • Molecular mechanisms governing the timing and location of synaptic remodeling remain largely unknown.

Purpose of the Study:

  • To elucidate the transcriptional mechanisms patterning synaptic remodeling at C. elegans neuromuscular junctions.
  • To identify the molecular regulators controlling cell-type-specific synaptic plasticity.

Main Methods:

  • Investigated differential gene expression in motor neurons (DD vs. VD).
  • Utilized genetic mutations in transcription factors (HBL-1, UNC-55/COUP-TF) and microRNAs (mir-84).
  • Assessed the impact of altered circuit activity on gene expression and synaptic remodeling timing.

Main Results:

  • Differential expression of transcription factor HBL-1 underlies cell-type specificity in NMJ remodeling.
  • HBL-1 is repressed in VD neurons by UNC-55/COUP-TF, preventing their remodeling.
  • mir-84 microRNA inhibits HBL-1, and its absence leads to precocious remodeling.
  • Circuit activity modulates HBL-1 expression, influencing the timing of synaptic plasticity.

Conclusions:

  • Convergent regulation of HBL-1 expression provides a genetic mechanism for patterning activity-dependent synaptic remodeling.
  • This mechanism ensures cell-type and developmental-time specificity of synaptic plasticity.