The evolutionary origin of chordate segmentation: revisiting the enterocoel theory

Theory in Biosciences = Theorie in Den Biowissenschaften
Takayuki Onai

Abstract

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...Continue Reading

References

Apr 1, 1992·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·S J Gould
Jan 23, 1998·Developmental Dynamics : an Official Publication of the American Association of Anatomists·J R ThompsonL J Gudas
Oct 17, 2003·Development·Carolina MinguillónJordi Garcia-Fernàndez
Oct 28, 2005·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Gerd B Müller, Stuart A Newman
Nov 30, 2005·Journal of Anatomy·Drew M Noden, Paul A Trainor
Aug 29, 2006·PLoS Biology·Christopher J LoweJohn Gerhart
Oct 19, 2006·Theory in Biosciences = Theorie in Den Biowissenschaften·Lennart OlssonRobert Cerny
Feb 15, 2007·Genesis : the Journal of Genetics and Development·Stacy L K RasmussenNicholas D Holland
Apr 15, 1983·Science·C Gans, R G Northcutt
May 21, 2008·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Manami MatsuuraMikiko Tanaka
Jun 20, 2008·Nature·Nicholas H PutnamDaniel S Rokhsar
Oct 25, 2008·Development Genes and Evolution·Laura Beaster-JonesLinda Z Holland
Oct 28, 2008·Development·Matthias Hammerschmidt, Doris Wedlich
Sep 10, 2009·Nature Reviews. Neuroscience·Linda Z Holland
Nov 1, 2008·Integrative and Comparative Biology·Shigeru Kuratani
Nov 1, 2008·Integrative and Comparative Biology·R Glenn Northcutt
Nov 1, 2008·Integrative and Comparative Biology·Linda Z HollandEdwin Gilland
Jun 17, 2011·Proceedings. Biological Sciences·J Andrew GillisChristopher J Lowe
Mar 17, 2012·Nature·Ariel M PaniChristopher J Lowe
Jun 28, 2012·Development·Eric Röttinger, Christopher J Lowe
Nov 13, 2012·Current Topics in Developmental Biology·Masazumi Tada, Masatake Kai
Dec 21, 2012·Nature·Yasuhiro OisiShigeru Kuratani
Jan 25, 2013·Development·Stephen A GreenChristopher J Lowe
Apr 23, 2013·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Jon Mallatt, Nicholas Holland
Mar 1, 2012·Wiley Interdisciplinary Reviews. Developmental Biology·Linda Z Holland, Takayuki Onai
Sep 26, 2012·Annual Review of Genomics and Human Genetics·Takayuki OnaiShigeru Kuratani
Jun 12, 2014·Nature·Simon Conway Morris, Jean-Bernard Caron
Jul 6, 2014·EvoDevo·Jens H FritzenwankerChristopher J Lowe
Apr 24, 2015·Nature·Nicholas D HollandPeter W H Holland
Apr 24, 2015·Nature·Christopher J LoweJohn Gerhart
Nov 19, 2015·Nature·Oleg SimakovJohn Gerhart
Nov 26, 2015·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Nicholas D Holland
Nov 26, 2015·Zoological Letters·Takayuki OnaiShigeru Kuratani

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Citations

Apr 11, 2020·Development, Growth & Differentiation·Yuuri Yasuoka

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Methods Mentioned

BETA
scanning electron microscopy

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