相关实验视频
Updated: May 17, 2025

09:23
Maintaining Aedes aegypti Mosquitoes Infected with Wolbachia
Published on: August 14, 2017
14.1K
结合的进化速率形成了夏威夷的昆虫共生系统
Patrick H Degnan1, Diana M Percy2, Allison K Hansen3
1Department of Microbiology and Plant Pathology, University of California, Riverside, CA, USA. patrickd@ucr.edu.
BMC genomics
|April 4, 2025
概括
夏威夷psyllids及其共生体显示相关的基因组进化,与其他昆虫系统不同. 具有多个共生体的自由生活类动物表现出更高的突变率,影响核和内共生体基因组.
科学领域:
- 进化生物学 进化生物学
- 基因组学就是基因组学.
- 这种共生是共生.
背景情况:
- 夏威夷Pariaconus psyllid辐射为研究核,线粒体和内生生物基因组的共同进化提供了一个独特的模型.
- 在过去的3-350万年里,这些虫在夏威夷群岛上多样化,在它们的宿主植物"Ōhi'a lehua.ua"上占据了独特的生态.
- 类有1-3种有益的细菌内共生体,之前对类似系统的研究表明线粒体和内共生体之间的进化速率脱.
研究的目的:
- 为了研究帕里亚科努斯 (Pariaconus) 类动物,它们的线粒体和它们的内共生生物的进化趋势.
- 为了确定Pariaconus psyllids是否符合其他多内共生昆虫系统中观察到的脱序进化速率的范式.
- 为了检查生态多样化和基因组进化之间的相互作用在这个psyllid辐射.
主要方法:
- 来自 ohialoha 种群的新卡森氏菌基因组的测序.
- 对六种帕里亚科纳斯物种的线粒体基因组进行比较分析.
- 核,线粒体和内生生物体基因组的遗传学分析.
主要成果:
- 在不同的物种中,Carsonella基因组中观察到高基因保护.
- 在所有研究的Pariaconus物种的线粒体基因组中发现了完整的合成,这表明强烈的净化选择.
- 遗传学分析揭示了核,线粒体和内共生体基因组之间的相关替代率,这与以前解的发现相矛盾.
- 有三个共生体的自由活体psyllids显示出高突变率 (1.21.6x) 和在核和一个内共生体基因组中增加非同义替代物的固定.
结论:
- 生态多样化和基因组进化在Pariaconus psyllids中是紧密联系在一起的.
- 仅仅存在多个内共生体伴侣并不需要序列进化的脱率.
- 进一步研究基底类类谱系将增强对驱动昆虫-共生体基因组进化的机制的理解.
相关概念视频
Speciation Rates
20.8K
Overview
20.8K
Frequency-dependent Selection
21.7K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
21.7K
Pollination and Flower Structure
63.2K
Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.
63.2K
Formation of Species
38.8K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
38.8K
Symbiosis
27.1K
Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
27.1K
Gene Evolution - Fast or Slow?
7.0K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
7.0K

