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Diverse feather shape evolution enabled by coupling anisotropic signalling modules with self-organizing branching

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Molecular signals like GDF10 and GREM1 control feather vane shape by regulating epithelial branching. Retinoic acid gradients further refine feather diversity, enabling adaptation in avian evolution.

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Area of Science:

  • Evolutionary developmental biology
  • Paleontology
  • Molecular biology

Background:

  • Feathered dinosaurs and Mesozoic birds rapidly diversified feather vane shapes, facilitating adaptation to new ecological niches.
  • The precise molecular mechanisms underlying feather vane shape diversification remain largely unknown.

Purpose of the Study:

  • To elucidate the molecular pathways governing feather vane development and shape diversification.
  • To identify key signaling molecules and their roles in establishing feather morphology.

Main Methods:

  • Morphological analysis of feather structures.
  • Transcriptome profiling to identify gene expression patterns.
  • Functional perturbations to assess gene function.
  • Mathematical simulations to model developmental processes.

Main Results:

  • Mesenchyme-derived GDF10 and GREM1 were identified as crucial regulators of rachidial and barb generative zones, respectively, controlling vane boundary formation.
  • Interactions between GDF10/GREM1 and the WNT gradient establish bilateral-symmetric feather vane configurations.
  • Combinations of CYP26B1, CRABP1, and RALDH3 modulate retinoic acid (RA) landscapes, influencing GREM1 expression and epithelial cell shape.
  • Dynamic RA gradients were shown to generate asymmetric flight feathers and distinct vane shapes across different feather tracts.

Conclusions:

  • Anisotropic signaling modules, particularly involving GDF10, GREM1, and retinoic acid, were co-opted to drive significant feather shape diversification.
  • These molecular mechanisms provide a framework for understanding the evolution of complex feather structures in birds and their ancestors.