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在平虫中和内部的感觉坑的融合进化
Ludwik Gąsiorowski1, Isabel Lucia Dittmann2, Jeremias N Brand3
1Department of Tissue Dynamics and Regeneration, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, 37077, Göttingen, Germany. ludwik.gasiorowski@mpinat.mpg.de.
BMC biology
|November 23, 2023
概括
状虫平虫的感觉坑与尼默特人头部器官没有共同的同质性. 这些坑可能是从光受体进化出来的,这表明平虫的感觉器官的独立进化.
科学领域:
- 动物学 动物学
- 进化生物学 进化生物学
- 发展生物学 发展生物学
背景情况:
- 虫类,是其他平虫的姊妹群,缺乏眼睛,并拥有突出的头部感觉结构,如感觉坑.
- 感觉坑在 Stenostomidae 家庭是侧面的形陷,这是一个关键的分类学特征.
- 之前的假设表明,平虫的感觉坑和尼默特人的头部器官之间存在同质性.
研究的目的:
- 为了研究Stenostomum brevipharyngium中的感觉坑的形态和基因表达.
- 为了测试catenulid感官坑和nemertean头部器官之间的拟议的同质性.
主要方法:
- 使用共聚焦和电子显微镜检查感觉坑形态和发展.
- 分析了包括pax4/6在内的转录因子的基因表达模式.
- 进行了与内蒙古头部器官发育的比较分析.
主要成果:
- 感官坑主要由具有微突投射的神经元类细胞组成,缺乏毛.
- 只有pax4/6基因在尼默特人头部器官和catenulid感觉坑之间表达得到保护.
- 在 stenostomid 感官坑细胞和腹光受体之间观察到超结构的相似性.
结论:
- 由于缺乏形态和分子证据,catenulid感官坑和nemertean头部器官之间的同质性被拒绝.
- 斯坦诺斯托米德感官坑可能代表祖先光感受器的二次进化,这些光感受器失去了光敏感性.
- 感觉坑般的器官在Platyhelminthes属内独立地进化了多次.
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