Hall B K
Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada.
Cleft Palate J. 1990 Apr;27(2):95-100. doi: 10.1597/1545-1569(1990)027<0095:eiicb>2.3.co;2.
This overview discusses evolution in the context of craniofacial development and developmental processes. It begins with a discussion of the origins of the craniofacial tissues in the dentine and bone of the dermal denticles of the Ordovician jawless vertebrates, followed by a brief discussion of the mechanisms responsible for the evolution of the jaws and the origin of vertebrate dentition. Then the unique neural crest cell origin of the craniofacial skeletogenic and odontogenic tissues is discussed with emphasis on the constancy of rostrocaudal polarization of the skeletogenic cranial neural crest. Given this constancy, the variation in the craniofacial region that occurs across the vertebrates must arise because of epigenetic interactions that evoke the differentiation of craniofacial tissues. These are discussed in the context of epigenetic cascades of epithelial-mesenchymal interactions and how such epigenetic control has itself evolved. Although several mechanisms are considered, emphasis is placed on variation of the timing of development processes (heterochrony).
本综述讨论了颅面发育和发育过程背景下的进化。首先讨论了奥陶纪无颌脊椎动物真皮小齿的牙本质和骨骼中颅面组织的起源，接着简要讨论了颌骨进化的机制和脊椎动物牙列的起源。然后讨论了颅面骨骼生成和牙源性组织独特的神经嵴细胞起源，重点是骨骼生成的颅神经嵴前后极化的恒定性。鉴于这种恒定性，脊椎动物颅面区域的差异必定是由于引发颅面组织分化的表观遗传相互作用所致。这些将在表观遗传级联的上皮-间充质相互作用以及这种表观遗传控制本身如何进化的背景下进行讨论。虽然考虑了几种机制，但重点是发育过程时间的变化（异时性）。
