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Specification of neuronal identities by feedforward combinatorial coding.

Magnus Baumgardt1, Irene Miguel-Aliaga, Daniel Karlsson

  • 1Division of Molecular Genetics, Department of Physics, Chemistry and Biology, Linkoping University, Linkoping, Sweden.

Plos Biology
|February 15, 2007
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Summary
This summary is machine-generated.

Early regulators in neuronal development are repurposed for specific cell fates. The gene collier acts as a key combinatorial factor, ensuring precise neuronal identity in Drosophila.

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Area of Science:

  • Developmental neurobiology
  • Molecular genetics
  • Cell fate determination

Background:

  • Neuronal specification involves broad identity regulators followed by subtype-specific combinatorial codes.
  • The role of early regulators in later combinatorial codes and developmental potential restriction remains unclear.

Purpose of the Study:

  • To investigate how early determinants are redeployed in subtype-specific combinatorial codes.
  • To elucidate the function of the HLH gene collier in neuronal identity restriction.
  • To understand the specificity and mechanism of combinatorial codes in neuronal fate determination.

Main Methods:

  • Utilized the differential peptidergic fate of two lineage-related neurons in the Drosophila ventral nerve cord.
  • Employed misexpression experiments to analyze the function of the collier gene.
  • Investigated combinatorial codes governing FMRFamide and Nplp1/DopR neuronal identities.

Main Results:

  • The HLH gene collier functions at multiple levels to progressively restrict neuronal identity in the 5-6 lineage.
  • Collier acts as a critical combinatorial factor differentiating FMRFamide versus Nplp1/DopR neuronal identities.
  • Both combinatorial codes can activate neuropeptide gene expression broadly but exhibit remarkable specificity for their cognate neuropeptide.

Conclusions:

  • Early determinants can be critically re-deployed as key players in later combinatorial codes.
  • A limited set of regulators can form potent combinatorial codes dictating unique neuronal cell fates.
  • These combinatorial codes demonstrate specificity despite overlapping composition and disregard for global instructive cues.