Organizational principles of integumentary organs: Maximizing variations for effective adaptation.

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

The integument serves as the interface between an organism and its environment. It primarily comprises ectoderm-derived epithelium and mesenchyme derived from various embryonic sources. These integumentary organs serve as a barrier defining the physiological boundary between the internal and exterior environments and fulfill diverse functions. How does the integument generate such a large diversity? Here, we attempt to decipher the organizational principles. We focus on amniotes and use appendage follicles as the primary examples. The integument begins as a simple planar sheet of coupled epithelial and mesenchymal cells, then becomes more complex through the following patterning processes. 1) De novo Turing periodic patterning process: This process converts the integument into multiple skin appendage units. 2) Adaptive patterning process: Dermal muscle, blood vessels, adipose tissue, and other components are assembled and organized around appendage follicles when present. 3) Cyclic renewal: Skin appendage follicles contain stem cells and their niches, enabling physiological molting and regeneration in the adult animal. 4) Spatial variations: Multiple appendage units allow modulation of shape, size, keratin types, and color patterns of feathers and hairs across the animal's surface. 5) Temporal phenotypic plasticity: Cyclic renewal permits temporal transition of appendage phenot

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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