Reptile scale paradigm: Evo-Devo, pattern formation and regeneration
Identifieur interne : 000286 ( Main/Curation ); précédent : 000285; suivant : 000287Reptile scale paradigm: Evo-Devo, pattern formation and regeneration
Auteurs : Cheng Chang [États-Unis, République populaire de Chine] ; Ping Wu [États-Unis] ; Ruth E. Baker [Royaume-Uni] ; Philip K. Maini [Royaume-Uni] ; Lorenzo Alibardi [Italie] ; Cheng-Ming Chuong [États-Unis]Source :
- The International journal of developmental biology [ 0214-6282 ] ; 2009.
Abstract
The purpose of this perspective is to highlight the merit of the reptile integument as an experimental model. Reptiles represent the first amniotes. From stem reptiles, extant reptiles, birds and mammals have evolved. Mammal hairs and feathers evolved from Therapsid and Sauropsid reptiles, respectively. The early reptilian integument had to adapt to the challenges of terrestrial life, developing a multi-layered
Url:
DOI: 10.1387/ijdb.072556cc
PubMed: 19557687
PubMed Central: 2874329
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PMC:2874329Le document en format XML
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<front><div type="abstract" xml:lang="en"><p id="P1">The purpose of this perspective is to highlight the merit of the reptile integument as an experimental model. Reptiles represent the first amniotes. From stem reptiles, extant reptiles, birds and mammals have evolved. Mammal hairs and feathers evolved from Therapsid and Sauropsid reptiles, respectively. The early reptilian integument had to adapt to the challenges of terrestrial life, developing a multi-layered <italic>stratum corneum</italic>
capable of barrier function and ultraviolet protection. For better mechanical protection, diverse reptilian scale types have evolved. The evolution of endothermy has driven the convergent evolution of hair and feather follicles: both form multiple localized growth units with stem cells and transient amplifying cells protected in the proximal follicle. This topological arrangement allows them to elongate, molt and regenerate without structural constraints. Another unique feature of reptile skin is the exquisite arrangement of scales and pigment patterns, making them testable models for mechanisms of pattern formation. Since they face the constant threat of damage on land, different strategies were developed to accommodate skin homeostasis and regeneration. Temporally, they can be under continuous renewal or sloughing cycles. Spatially, they can be diffuse or form discrete localized growth units (follicles). To understand how gene regulatory networks evolved to produce increasingly complex ectodermal organs, we have to study how prototypic scale-forming pathways in reptiles are modulated to produce appendage novelties. Despite the fact that there are numerous studies of reptile scales, molecular analyses have lagged behind. Here, we underscore how further development of this novel experimental model will be valuable in filling the gaps of our understanding of the Evo-Devo of amniote integuments.</p>
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