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Author Spotlight: Insight into the Current Experimental Avian Skin Explant Methodologies

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Review: cornification, morphogenesis and evolution of feathers.

Lorenzo Alibardi¹

¹Comparative Histolab and Department of BIGEA, University of Bologna, via Selmi 3, 40126, Bologna, Italy. lorenzo.alibardi@unibo.it.

|September 12, 2016

Summary

Feather development involves intricate cell organization and protein expression, leading to diverse feather structures. Genetic expansion of feather beta-proteins facilitated the evolution of various feather types, including those for flight.

Keywords:

Corneous beta-proteins Development Evolution Feathers Follicular patterns Regeneration

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Area of Science:

Developmental biology
Evolutionary biology
Biochemistry

Background:

Feathers are complex epidermal structures originating from feather germs.
Their formation involves the morphogenesis of barb ridges and the differentiation of specialized cells.
Understanding feather development is crucial for insights into avian evolution and integumentary system biology.

Purpose of the Study:

To elucidate the cellular and molecular mechanisms underlying feather morphogenesis.
To analyze the protein composition and structural organization of feather components.
To explore the evolutionary expansion of feather-related genes and their role in feather diversification.

Main Methods:

Histological and ultrastructural analyses of developing and regenerating feathers.
Molecular genetic analysis of feather protein-coding genes in chick genomes.
Comparative analysis of feather structures and their developmental pathways.

Main Results:

Feather cells organize in a branching structure within barb ridges, with supportive cells degenerating to form corneous barbules.
Feather beta-proteins, encoded by numerous genes, form unique filaments distinct from intermediate filament keratins.
Specific protein associations result in biomechanically distinct materials for different feather parts (barbules, rami, rachis, calamus).

Conclusions:

Feather morphogenesis, driven by epidermal and dermal interactions, produces diverse feather types.
Genomic expansion of feather beta-proteins played a key role in the evolution and diversification of feathers, including flight feathers.
Further research is needed to understand the temporal patterns and molecular controls of barb ridge formation.