软体动物的贝,,和格拉迪是进化深度保存的.
Cristian Camillo Barrera Grijalba1, Sonia Victoria Rodríguez Monje1, Gabriela Ariza Aranguren1
1Faculty of Life Sciences, Department of Evolutionary Biology, University of Vienna, Vienna, Austria.
概括
这项研究揭示了尖可能在软体动物之前已经进化,这表明它与足动物和类动物的共同进化起源. 贝领域的费里丁基因表达似乎是胃类动物独有的.
科学领域:
- 进化发育生物学 进化发育生物学
- 进行比较的基因组学.
- 无脊椎动物动物学 不脊椎动物动物学
背景情况:
- 贝,尖和链条是螺旋体中多样化的硬结构,具有争论的形成过程和进化联系.
- 了解这些结构的遗传基础对于破译它们的进化历史至关重要.
研究的目的:
- 研究不同螺旋群体中涉及和尖形成的保存基因的表达.
- 为了探索尖和软体动物之间的进化关系.
主要方法:
- 检查了转录因子基因 (hox1,goosecoid,grainyhead,notch,delta,zic) 和结构基因 (胆合成酶,费里丁) 的表达.
- 分析了形表皮和形细胞中的基因表达,这些细胞是形动物 (Polyplacophora,Neomeniomorpha) 和形动物 (Cephalopoda,Scaphopoda) 的.
主要成果:
- 保存的基因在状细胞和状细胞中都得到了表达,这表明它们之间存在密切的关系.
- 聚普拉科福兰体和新体形体中的状细胞表达了特定的基因,包括新体形体中的hox1.
- 在研究的状细胞和状贝领域中,费里丁基因表达不存在,这表明它是一种胃类动物的创新.
结论:
- 脊柱和贝场共享一个共同的遗传基础,这表明同源性.
- 尖很可能早于软体动物,可能与足动物和类动物同类.
- 状软体动物在进化过程中可能是第二次失去尖.
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