The evolutionary origin of chordate segmentation: revisiting the enterocoel theory

Theory in Biosciences - Tập 137 - Trang 1-16 - 2018
Takayuki Onai1,2
1Department of Anatomy, School of Medical Sciences, University of Fukui, Eiheiji-cho, Yoshida-gun, Japan
2Life Science Innovation Center, University of Fukui, Eiheiji-cho, Yoshida-gun, Japan

Tóm tắt

One of the definitive characteristics of chordates (cephalochordates, vertebrates) is the somites, which are a series of paraxial mesodermal blocks exhibiting segmentation. The presence of somites in the basal chordate amphioxus and in vertebrates, but not in tunicates (the sister group of vertebrates), suggests that the tunicates lost the somites secondarily. Somites are patterned from anterior to posterior during embryogenesis. How such a segmental pattern evolved from deuterostome ancestors is mysterious. The classic enterocoel theory claims that chordate mesoderm evolved from the ancestral deuterostome mesoderm that organizes the trimeric body parts seen in extant hemichordates. Recent progress in molecular embryology has been tremendous, which has enabled us to test this classic theory. In this review, the history of the study on the evolution of the chordate mesoderm is summarized. This is followed by a review of the current understanding of genetic mapping on anterior/posterior (A/P) mesodermal patterning between chordates (cephalochordates, vertebrates) and a direct developing hemichordate (Saccoglossus kowalevskii). Finally, a possible scenario about the evolution of the chordate mesoderm from deuterostome ancestors is discussed.

Tài liệu tham khảo

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