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TALE factors use two distinct functional modes to control an essential zebrafish gene expression program.

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Transcription Activator-Like Effencers (TALE) control anterior development via a gene regulatory network. TALE factors use distinct DNA motifs and protein partners at different embryonic stages, revealing a novel functional mechanism.

Keywords:
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Area of Science:

  • Developmental biology
  • Gene regulation
  • Molecular mechanisms

Background:

  • Transcription Activator-Like Effencers (TALE) are broadly expressed during embryogenesis.
  • TALE factors are known to interact with transcription factors (TFs) like Hox proteins during gastrulation and segmentation.
  • The precise mechanisms and stage-specific functions of TALE factors throughout embryogenesis remain incompletely understood.

Purpose of the Study:

  • To investigate the role of TALE factors in anterior development.
  • To identify the gene regulatory network (GRN) dependent on TALE factors.
  • To elucidate the stage-specific DNA binding motifs and protein partners utilized by TALE factors during embryogenesis.

Main Methods:

  • Identification of a TALE-dependent GRN essential for anterior development.
  • Chromatin occupancy analysis to detect TALE binding sites throughout embryogenesis.
  • Co-immunoprecipitation and chromatin assays to study TALE-NF-Y and TALE-PBX:HOX interactions.
  • Analysis of DNA motifs (DECA, HEXA) associated with TALE binding.

Main Results:

  • A TALE-dependent GRN crucial for anterior development was identified.
  • TALE occupancy was detected across this GRN throughout embryonic development.
  • At blastula stages, TALE factors bind DECA motifs alongside NF-Y, regulating chromatin state.
  • At segmentation stages, TALE binding expands to HEXA motifs near PBX:HOX sites.

Conclusions:

  • TALE factors orchestrate a key GRN for anterior development using distinct mechanisms at different embryonic stages.
  • TALE factors employ stage-specific DNA motifs (DECA, HEXA) and protein partners (NF-Y, PBX:HOX).
  • This adaptable binding strategy may explain TALE's oncogenic potential and its use by other broadly expressed TFs.