心形尺度形态类型的意想不到的普遍性在Centroplasthelida (Haptista):祖先特征或多重收购?
Elena A Gerasimova1, Yulia V Mindolina2, Denis V Tikhonenkov1,3
1AquaBioSafe Laboratory, University of Tyumen, Tyumen, Russia.
The Journal of eukaryotic microbiology
|July 14, 2023
概括
中心体,单细胞原生体,表现出多样化的垢. 一个心形的脊柱尺度形态型,以前认为是罕见的,现在在第四个血统中发现,这表明一种祖先的特征.
科学领域:
- 亲生组织学 亲生组织学 Protistology
- 微生物学 微生物学
- 进化生物学 进化生物学
- 状微生物形态学 形态学
背景情况:
- 中心类动物 (Haptista:Centroplasthelida) 是轴足的原生动物,以各种外部状而闻名.
- 祖先的中心体被假设拥有双层的状,包括辐射的脊柱.
- 心形的基础脊柱最初被认为是Choanocystis属的独一无二.
研究的目的:
- 为了研究细胞系的位置和尺度形态的中心螺旋体.
- 为了确定心形的基础脊柱尺度形态型是否存在于其他中心体血统中.
- 重新评估这种独特的尺度形态学的进化起源.
主要方法:
- 扫描电子显微镜 (SEM) 用于检查Cernunnos uralica. 的尺度形态.
- 进行小亚单元核糖体DNA (SSU rDNA) 测序以进行分子遗传学分析.
- 进行了遗传学分析,以确定Cernunnos uralica在Pterocystida中的位置.
主要成果:
- 新的科系Cernunnos被确立,包括Cernunnos uralica,Cernunnos arctica,Cernunnos america和Cernunnos antarctica. 这是一个新的科系.
- 乌拉里卡 (Cernunnos uralica) 表现出脊柱和心形底部,这是之前在Ozanamiidae,Meringosphaeridae和Marophryidae中观察到的表型.
- 分子遗传学分析将Cernunnos uralica置于Pterocystida中的海洋环境分类P中.
结论:
- 在第四个独特的血统 (Pterocystidae) 中存在心形底脊椎的存在挑战了关于其独特性的先前假设.
- 虽然并行进化是可能的,但这种形态型的广泛发生表明,它可能是从中心体的最后一个共同祖先遗传的祖先特征.
- 这一发现扩大了我们对中心体多样性和它们复杂的状外骨架的演变的理解.
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