Bilaterian origins: significance of new experimental observations.
Bilaterian origins: significance of new experimental observations.
复制标题
DOI：
10.1006/dbio.1999.9475
复制
发表时间：
2000-03
影响因子：
2.7
通讯作者：
K. Peterson;R. Cameron;E. Davidson
中科院分区：
文献类型：
--
作者：
K. Peterson;R. Cameron;E. Davidson
根据我们关于两侧动物起源的预留细胞理论，我们回顾并解释了最近几个与两侧动物起源有关的实验室观察结果。我们首先讨论有关双边门系统发育的新数据。接下来，我们用系统的、分子的和古生物的证据来论证棘皮动物和半足动物最新的共同祖先使用了最大的间接发展模式。此外，软体动物和环节动物的最新共同祖先也在间接发展。最后，我们讨论了Hox基因表达模式的新数据，这些数据表明海胆和多毛类环节动物都以非常相似的方式使用Hox基因。两者在幼虫本身的发育过程中都不利用完整的Hox复合物，而Hox复合物在形成成虫身体计划的备用细胞中表达。我们目前对双边动物祖先的看法是在系统发育方面进行了总结，并纳入了本文所讨论的特征。
Several recent laboratory observations that bear on the origin of the Bilateria are reviewed and interpreted in light of our set-aside cell theory for bilaterian origins. We first discuss new data concerning the phylogeny of bilaterian phyla. Next, we use systematic, molecular, and paleontological lines of evidence to argue that the latest common ancestor of echinoderms plus hemichordates used a maximal indirect mode of development. Furthermore, the latest common ancestor of molluscs and annelids was also indirectly developing. Finally, we discuss new data on Hox gene expression patterns which suggest that both sea urchins and polychaete annelids use Hox genes in a very similar fashion. Neither utilizes the complete Hox complex in the development of the larva per se, while the Hox complex is expressed in the set-aside cells from which the adult body plan is formed. Our current views on the ancestry of the bilaterians are summarized in phylogenetic terms, incorporating the characters discussed in this paper.