节肢动物tagmata的发展和进化
1Department of Ecology, Evolution & Behavior, The Silberman Institute of Life Science, The Hebrew University of Jerusalem, Jerusalem, Israel.
Proceedings. Biological sciences
|April 16, 2025
概括
这项研究提出了关节动物标记物进化的新框架,表明三个祖先的发育标记物合并形成复杂的成年人体计划. 这挑战了现有的关节动物发育和细分决定模型.
科学领域:
- 发展生物学 发展生物学
- 进化生物学 进化生物学
- 关节动物生物学 关节动物生物学
背景情况:
- 细分体是关节动物的一个决定性特征.
- 节肢动物的细分被组织成称为tagmata的功能单元,这些功能单元在各个类别 (例如,昆虫头部,胸部,腹部) 之间有所不同.
- 了解塔格马塔的进化对于破译关节动物体型的多样化至关重要.
研究的目的:
- 为节肢动物tagmata的进化提出一个新的框架.
- 将胚胎学数据和古典发育描述整合到一个新的进化模型中.
- 重新评估关节动物发育生物学中已建立的概念.
主要方法:
- 综合来自胚胎学研究的数据关于不同类型的节肢动物的细分生成.
- 审查关于关节动物发育的古典文学.
- 基于祖先的发育标签,开发一个新的概念框架.
主要成果:
- 提出了三种发育性tagmata的祖先状况:产前段,在发育场内形成的tagma,以及来自段-添加区的tagma.
- 这些胚胎的tagmata可能在胚胎后融合,形成复杂的成年tagmata.
- 该框架与早期节肢动物化石记录中观察到的模式保持一致.
结论:
- 拟议的框架为关节动物的变化提供了新的视角.
- 这种模型需要重新审视短细菌与长细菌发展二分法.
- 它促使重新评估细分身份确定和Hox基因在标记差异化中的作用.
相关概念视频
01:23Phylogeny
43.4K
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
43.4K
01:56Gastrulation
55.0K
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
55.0K
02:40The Tree of Life - Bacteria, Archaea, Eukaryotes
31.7K
The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
31.7K
02:22The Colonization of Land
34.1K
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
34.1K
01:24Eukaryotic Evolution
29.9K
The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
29.9K
01:54Convergent Evolution
27.2K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
27.2K