Patterning of anteroposterior body axis displayed in the expression of Hox genes in sea cucumber Apostichopus japonicus

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• 作者：Mani Kikuchi ; Akihito Omori ; Daisuke Kurokawa…
• 关键词：Anteroposterior axis ; Echinoderm ; Hox ; Sea cucumber
• 刊名：Development Genes and Evolution
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：225
• 期：5
• 页码：275-286
• 全文大小：2,507 KB
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• 作者单位：Mani Kikuchi (1)
  Akihito Omori (1)
  Daisuke Kurokawa (1)
  Koji Akasaka (1)
  
  1. Misaki Marine Biological Station, Graduate School of Science, The University of Tokyo, 1024 Koajiro, Misaki, Miura, Kanagawa, 238-0225, Japan
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Developmental Biology
  Neurosciences
  Cell Biology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-041X

文摘

The presence of an anteroposterior body axis is a fundamental feature of bilateria. Within this group, echinoderms have secondarily evolved pentameral symmetric body plans. Although all echinoderms present bilaterally symmetric larval stages, they dramatically rearrange their body axis and develop a pentaradial body plan during metamorphosis. Therefore, the location of their anteroposterior body axis in adult forms remains a contentious issue. Unlike other echinoderms, sea cucumbers present an obvious anteroposterior axis not rearranged during metamorphosis, thus representing an interesting group to study their anteroposterior axis patterning. Hox genes are known to play a broadly conserved role in anteroposterior axis patterning in deuterostomes. Here, we report the expression patterns of Hox genes from early development to pentactula stage in sea cucumber. In early larval stages, five Hox genes (AjHox1, AjHox7, AjHox8, AjHox11/13a, and AjHox11/13b) were expressed sequentially along the archenteron, suggesting that the role of anteroposterior patterning of the Hox genes is conserved in bilateral larvae of echinoderms. In doliolaria and pentactula stages, eight Hox genes (AjHox1, AjHox5, AjHox7, AjHox8, AjHox9/10, AjHox11/13a, AjHox11/13b, and AjHox11/13c) were expressed sequentially along the digestive tract, following a similar expression pattern to that found in the visceral mesoderm of other bilateria. Unlike other echinoderms, pentameral expression patterns of AjHox genes were not observed in sea cucumber. Altogether, we concluded that AjHox genes are involved in the patterning of the digestive tract in both larvae and metamorphosis of sea cucumbers. In addition, the anteroposterior axis in sea cucumbers might be patterned like that of other bilateria. Keywords Anteroposterior axis Echinoderm Hox Sea cucumber