Developmental studies provide new insights into the evolution of sense organs in Sabellariidae (Annelida).
Developmental studies provide new insights into the evolution of sense organs in Sabellariidae (Annelida).
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DOI：
10.1186/s12862-018-1263-5
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发表时间：
2018-10-04
影响因子：
3.4
通讯作者：
Capa M
中科院分区：
文献类型：
--
作者：
Helm C;Bok MJ;Hutchings P;Kupriyanova E;Capa M
Sabellarids，也被称为蜂窝或沙堡蠕虫，在建造它们的管道时，产生化学信号（游离脂肪酸），负责幼虫定居和三维聚集体的形成。幼虫的触须和背驼峰（成为正中器官的成年人）被假定参与这样的基板选择过程中解决。值得注意的是，剑形虫的中央器官是环节动物中一个明显独特的器官，被认为具有感觉功能，也许与其他多毛纲动物的颈部器官有一些相似之处。然而，详细的调查，这一突出的字符复杂，包括超微结构的检查是缺乏到目前为止。我们的全面调查提供了有关前感觉器官在Sabellariidae的数据，并告知他们在远洋幼虫发育过程中的转变。我们使用了比较的方法，包括免疫染色，随后的共聚焦激光扫描显微镜（clsm），组织切片以及电子显微镜在一系列的幼虫和成虫阶段的两个sabellariid物种。我们发现，神经元的神经支配，以及sabellariid纤毛结构的超微结构沿着正中器官是高度可比性的颈部器官已知的其他多毛类动物。此外，myoinhibitory蛋白（MIP）-一种已知也参与化学感觉的蛋白质-在幼虫正中器官的区域中被检测到。此外，我们揭示了一种不寻常的类型的感光器的存在下，Idanthyrsus australiensis与波纹的感觉膜超微结构的中间器官的一部分，不同于其他多毛类的节段ocelli中观察到的。我们首次描述了两种沙贝科动物不同发育阶段的颈状器官样结构。外部形态，神经支配，发育命运和超微结构的新发现的正中器官为基础的睫状窝与已知的环节动物颈部器官的特征，因此表明这两个感觉复合体的同源性。肌抑制肽（MIP）在相应区域的存在支持这样的假设，并表现出参与整个sabellariid正中器官复合体的可能性，特别是突出的纤毛窝，在化学感觉。本文的在线版本（10.1186/s12862-018-1263-5）包含补充材料，可供授权用户使用。
Sabellarids, also known as honeycomb or sandcastle worms, when building their tubes, produce chemical signals (free fatty acids) that are responsible for larval settlement and the formation of three-dimensional aggregations. The larval palps and the dorsal hump (becoming the median organ in adults) are presumed to participate in such a substrate selection during settlement. Notably, the sabellariid median organ is an apparently unique organ among annelids that has been attributed with a sensory function and perhaps with some affinities to the nuchal organs of other polychaetes. Nevertheless, detailed investigations of this prominent character complex including ultrastructural examinations are lacking so far. Our comprehensive investigations provide data about the anterior sensory organs in Sabellariidae and inform about their transformation during pelagic larval development. We used a comparative approach including immunostaining with subsequent confocal laser scanning microscopy (clsm), histological sections as well as electron microscopy in a range of larval and adult stages of two sabellariid species. We find that the neuronal innervation as well as the ultrastructure of the sabellariid ciliary structures along the median organ are highly comparable with that of nuchal organs known from other polychaetes. Furthermore, the myoinhibitory protein (MIP) – a protein known to be also involved into chemo-sensation - was detected in the region of the larval median organ. Moreover, we reveal the presence of an unusual type of photoreceptor as part of the median organ in Idanthyrsus australiensis with a corrugated sensory membrane ultrastructure unlike those observed in the segmental ocelli of other polychaetes. We are describing for the first time the nuchal organ-like structures in different developmental stages of two species of Sabellariidae. The external morphology, neuronal innervation, developmental fate and ultrastructure of the newly-discovered median organ-based ciliary pits are comparable with the characteristics known for annelid nuchal organs and therefore indicate a homology of both sensory complexes. The presence of myoinhibitory peptide (MIP) in the respective region supports such a hypothesis and exhibits the possibility of an involvement of the entire sabellariid median organ complex, and in particular the prominent ciliated pits, in chemo-sensation. The online version of this article (10.1186/s12862-018-1263-5) contains supplementary material, which is available to authorized users.
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影响因子：
0.9
作者：
Capa, Maria;Faroni-Perez, Larisse;Hutchings, Pat
通讯作者：
Hutchings, Pat
DOI：
10.1073/pnas.1220285110
发表时间：
2013-05-14
影响因子：
11.1
作者：
Conzelmann, Markus;Williams, Elizabeth A.;Jekely, Gaspar
通讯作者：
Jekely, Gaspar
影响因子：
1.6
作者：
Bok, Michael J.;Porter, Megan L.;Nilsson, Dan-Eric
通讯作者：
Nilsson, Dan-Eric
影响因子：
2.6
作者：
Bok, Michael J.;Capa, Maria;Nilsson, Dan-Eric
通讯作者：
Nilsson, Dan-Eric
影响因子：
2.6
作者：
Jelsing, J
通讯作者：
Jelsing, J