A new look at the ventral nerve centre of Sagitta: implications for the phylogenetic position of Chaetognatha (arrow worms) and the evolution of the bilaterian nervous system.
A new look at the ventral nerve centre of Sagitta: implications for the phylogenetic position of Chaetognatha (arrow worms) and the evolution of the bilaterian nervous system.
复制标题
对箭虫腹侧神经中枢的新认识：对毛颌动物（箭虫）系统发育位置和两侧对称动物神经系统进化的影响。
DOI：
10.1186/1742-9994-4-14
复制
发表时间：
2007-05-18
影响因子：
2.8
通讯作者：
Müller CH
中科院分区：
文献类型：
--
作者：
Harzsch S;Müller CH
毛颚类（箭蠕虫）是一组海洋食肉动物，其系统发育关系仍有激烈的争论。分子生物学研究至今未能对它们的系统发生位置提出一个稳定的假设。在广泛的后生动物中，神经系统已被证明为分析系统发育关系（神经系统发育）提供了丰富的特征。因此，在本研究中，我们探讨了腹神经中枢（“腹神经节”）的结构，在箭虫刚毛与一组组织化学和免疫组织化学标记。在乙酰化α微管蛋白免疫标记的标本中，腹侧神经中枢似乎是外周表皮内神经丛的浓缩延续。然而，突触蛋白免疫定位显示腹神经中枢是组织成一个高度有序的CA阵列。80个串联排列的微隔室。针对RFamide的免疫组织化学显示了一组连续排列的腹神经中枢中的可单独识别的神经元，我们详细绘制了这些神经元。的毛颚神经系统的结构上的新信息相比，以前的描述的腹神经中枢的批判性评价。我们的研究结果进行了讨论，关于神经系统组织在最后一个共同的双侧祖先和关于系统发育的亲缘关系，这毛颚类的辩论。我们建议把Chaetognatha内Protostomia和反对的假设，提出了后口的亲缘关系的Chaetognatha或姐妹组的关系，所有其他Bilateria。
The Chaetognatha (arrow worms) are a group of marine carnivores whose phylogenetic relationships are still vigorously debated. Molecular studies have as yet failed to come up with a stable hypothesis on their phylogenetic position. In a wide range of metazoans, the nervous system has proven to provide a wealth of characters for analysing phylogenetic relationships (neurophylogeny). Therefore, in the present study we explored the structure of the ventral nerve centre ("ventral ganglion") in Sagitta setosa with a set of histochemical and immunohistochemical markers. In specimens that were immunolabeled for acetylated-alpha tubulin the ventral nerve centre appeared to be a condensed continuation of the peripheral intraepidermal nerve plexus. Yet, synapsin immunolocalization showed that the ventral nerve centre is organized into a highly ordered array of ca. 80 serially arranged microcompartments. Immunohistochemistry against RFamide revealed a set of serially arranged individually identifiable neurons in the ventral nerve centre that we charted in detail. The new information on the structure of the chaetognath nervous system is compared to previous descriptions of the ventral nerve centre which are critically evaluated. Our findings are discussed with regard to the debate on nervous system organisation in the last common bilaterian ancestor and with regard to the phylogenetic affinities of this Chaetognatha. We suggest to place the Chaetognatha within the Protostomia and argue against hypotheses which propose a deuterostome affinity of Chaetognatha or a sister-group relationship to all other Bilateria.
登录
查看更多内容
影响因子：
2.9
作者：
Budd, GE
通讯作者：
Budd, GE
DOI：
10.1017/s0025315400041229
发表时间：
1978-01-01
影响因子：
1.2
作者：
BONE, Q;PULSFORD, A
通讯作者：
PULSFORD, A
影响因子：
2.5
作者：
GILCHRIST, LS;KLUKAS, KA;MESCE, KA
通讯作者：
MESCE, KA
DOI：
10.1098/rspb.1987.0007
发表时间：
1987-02-23
期刊：
PROCEEDINGS OF THE ROYAL SOCIETY SERIES B-BIOLOGICAL SCIENCES
影响因子：
--
作者：
BONE, Q;GRIMMELIKHUIJZEN, CJP;RYAN, KP
通讯作者：
RYAN, KP
影响因子：
3.6
作者：
DUVERT, M;BARETS, AL
通讯作者：
BARETS, AL