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Using Avian Skin Explants to Study Tissue Patterning and Organogenesis
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Module-based complexity formation: periodic patterning in feathers and hairs.

Cheng-Ming Chuong1, Chao-Yuan Yeh, Ting-Xin Jiang

  • 1Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA. cmchuong@usc.edu

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Summary
This summary is machine-generated.

Complex skin patterns, like feathers and hair, emerge from progenitor cells using reaction-diffusion and oscillating stem cell activities. This self-organization principle allows for regeneration and evolutionary novelty in integumentary organs.

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Area of Science:

  • Developmental biology
  • Pattern formation
  • Tissue engineering

Background:

  • Complex integumentary patterns, such as feather and hair arrangements, are visually striking and persist throughout an organism's life.
  • Periodic patterning, utilizing ensembles of follicles (modules), enables the generation of complexity, regional variations, and cyclic regeneration of skin appendages.
  • Understanding the rules governing these patterns is crucial for fields ranging from evolutionary biology to regenerative medicine.

Purpose of the Study:

  • To investigate how fields of progenitor cells generate periodic patterns based on genetic information, physicochemical rules, and developmental timing.
  • To explore the mechanisms of spatial and temporal pattern formation in skin appendages.
  • To discuss the evolutionary implications and tissue engineering applications of modular integumentary complexity.

Main Methods:

  • Exploration of Turing reaction-diffusion models for competitive equilibria regulated by activators/inhibitors.
  • Simulation of temporal patterns using oscillating stem cell activities and cellular automata principles.
  • Analysis of reconstitution experiments involving dissociated progenitor cells and studies on wound healing.

Main Results:

  • Periodic spatial patterns arise from progenitor cell fields governed by reaction-diffusion dynamics.
  • Temporal patterns are driven by oscillating stem cell activities within follicles, leading to cyclic growth phases (anagen/telogen).
  • Regenerative waves can be initiated by activators, with inhibitors preventing uncontrolled spread, and phenotypes can be modulated by external factors.

Conclusions:

  • Modular complexity in integumentary organs is a fundamental principle driving pattern formation and regeneration.
  • This self-organization capability offers insights into evolutionary processes and holds significant potential for tissue engineering applications, including hair follicle reconstitution.
  • The study highlights the interplay between genetic information, physical-chemical rules, and developmental timing in creating diverse and dynamic skin appendage patterns.