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Repressive Interactions Between Transcription Factors Separate Different Embryonic Ectodermal Domains.

Steven L Klein1, Andre L P Tavares1, Meredith Peterson2

  • 1Department of Anatomy and Cell Biology, The George Washington University School of Medicine and Health Sciences, Washington, D.C., DC, United States.

Frontiers in Cell and Developmental Biology
|February 24, 2022
PubMed
Summary
This summary is machine-generated.

Embryonic ectoderm domain formation involves cell-autonomous transcription factor repression, followed by cell-to-cell signaling. This clarifies how distinct cell populations arise from the early embryo.

Keywords:
epidermisfoxd4neural border zoneneural crestneural plateplacode

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Area of Science:

  • Developmental biology
  • Molecular embryology
  • Cellular differentiation

Background:

  • The embryonic ectoderm differentiates into four key domains: neural plate, neural crest, pre-placodal region (PPR), and epidermis.
  • Formation is driven by signaling gradients and debated models involving differential competence or a neural border zone.
  • Transcription factors (TFs) play crucial roles, with expression patterns resolving into domain-specific territories.

Purpose of the Study:

  • To investigate the cell-autonomous or non-cell-autonomous roles of transcription factors in segregating embryonic ectodermal domains.
  • To determine if ectopic expression of TFs can induce domain-specific characteristics in other ectodermal regions.
  • To elucidate the mechanisms underlying the initial separation of ectodermal territories.

Main Methods:

  • Ectopic expression of neural plate stage-specific TFs in different embryonic ectodermal domains.
  • Lineage tracing to track cell-autonomous effects of TF expression.
  • Analysis of single-cell RNA sequencing datasets to assess TF interactions within cells.
  • Observation of TF expression changes in both lineage-labeled and adjacent unlabeled cells.

Main Results:

  • Ectopic TF expression predominantly led to reduced expression of other TFs, indicating a repressive function.
  • Early effects (gastrulation) were cell-autonomous, confined to lineage-labeled cells.
  • Later stages (neurula) showed repression in both labeled and adjacent unlabeled cells, suggesting signaling.
  • Single-cell data confirmed co-expression of multiple TFs within individual cells, enabling intracellular interactions.

Conclusions:

  • Embryonic ectodermal domain segregation initiates through cell-autonomous, repressive TF interactions within individual cells.
  • Subsequently, non-cell-autonomous signaling between neighboring cells contributes to domain separation.
  • This study provides direct evidence for a two-step mechanism involving intracellular TF dynamics followed by intercellular communication.