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Error minimization in lateral inhibition circuits.

Omer Barad1, Dalia Rosin, Eran Hornstein

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel.

Science Signaling
|July 8, 2010
PubMed
Summary
This summary is machine-generated.

Robust fruit fly bristle pattern formation relies on rapid lateral inhibition and variable timing during sensory organ precursor (SOP) cell selection. Notch receptor cis interactions are key to this precise developmental process.

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Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Genetics

Background:

  • The fruit fly Drosophila exhibits highly reproducible sensory bristle patterns.
  • Sensory organ precursor (SOP) cell selection via lateral inhibition is crucial for bristle formation.
  • The underlying mechanisms ensuring the robustness of SOP selection remain unclear.

Purpose of the Study:

  • To define sources of error in SOP selection using probabilistic modeling.
  • To investigate how molecular circuits influence SOP selection accuracy.
  • To elucidate the role of Notch signaling in robust pattern formation.

Main Methods:

  • Probabilistic modeling to identify errors in SOP selection.
  • Analysis of molecular circuit dependencies.
  • Experimental validation using Drosophila mutants for Notch, Delta, and Serrate.

Main Results:

  • Rapid inhibition of non-selected cells and high cell-to-cell variability in selection timing are critical for accuracy.
  • Cell-autonomous (cis) Notch interactions shorten signal delay, facilitating accurate SOP selection.
  • Competition between cis and trans Notch interactions is essential for selection.

Conclusions:

  • Accurate SOP selection depends on rapid lateral inhibition and cis Notch interactions.
  • Reducing Notch ligand abundance can compensate for reduced Notch, validating the cis interaction model.
  • Developmental circuits' susceptibility to errors differentiates functionally similar designs.