双胞胎体的祖先和带状体的起源
1Friday Harbor Laboratories, University of Washington, Friday Harbor, WA 98250, USA.
Integrative and comparative biology
|August 6, 2024
概括
这种deuterostome的祖先很可能是一个复杂的虫. 通过审查基因组数据来澄清带动物的起源,这表明一些群体的带损失和带动物祖先的中枢神经系统进化.
科学领域:
- 进化生物学 进化生物学
- 发展生物学 发展生物学
- 基因组学就是基因组学.
背景情况:
- 德乌特奥斯托米亚是一个单体群,包括Ambulacraria (Hemichordata,Echinodermata) 和Chordata.
- 半带动物和皮动物是理解双体和带动物进化过程的关键.
- 肠类 ( Hemichordates) 呈现带状状的特征和发育遗传调节网络 (GRNs).
研究的目的:
- 用当前的基因组和GRN数据重新评估带状动物起源的假设.
- 为了了解体体祖先的特征.
- 为了研究心弦损失和中枢神经系统发育的进化影响.
主要方法:
- 双胞胎细胞组之间的基因组比较.
- 人类基因组分析.
- 对GRNs和化石记录的现有数据的审查.
主要成果:
- 脑带动物与脊椎动物共享合成和身体平面;带动物是脊椎动物的姐妹群.
- 长袍动物表现出显著的基因损失和不同的成年人体图案.
- 建议Deuterostome祖先是一个复杂的盆地虫,具有特定的特征.
- 皮动物/半皮动物的带损失与带动物的带增长一样温和.
结论:
- 这种deuterostome的祖先很可能拥有复杂的虫般的身体结构.
- 带弦动物的起源涉及中枢神经系统的保留和神经的进化,以及相关群体中潜在的带弦损失.
- 皮动物和长袍动物的高度衍生的身体计划是从这种祖先形式进化出来的.
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