积极选择驱动了Sternorrhyncha (昆虫:Hemiptera) 中的线粒体基因重排
Tian-You Zhao1,2, Jiu-Feng Wei3, Cai-Feng Li1
1Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaborative Innovation Center for Eco-Environment, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences Hebei Normal University Shijiazhuang Hebei China.
Ecology and evolution
|July 22, 2025
概括
这项研究构建了最大的线粒体数据集Sternorrhyncha (sap-feeding昆虫),揭示了新的遗传学关系和基因重排模式. 这些发现澄清了这一重要昆虫群体内的进化联系.
科学领域:
- 昆虫学 昆虫学是一门学科.
- 基因组学就是基因组学.
- 进化生物学 进化生物学
背景情况:
- 斯特诺林卡 (Sternorrhyncha) 是海米普特拉 (Hemiptera) 的一个分类,包括主要的农业和林业害虫,如虫和虫.
- 以前缺乏对Sternorrhyncha的综合性线粒体基因组研究,特别是由于Coccoidea线粒体基因组获取的挑战.
研究的目的:
- 为了构建迄今为止Sternorrhyncha最大的线粒体数据集.
- 在子顺序内建立强大的遗传关系和相互关系.
- 为了研究线粒体基因排列的协同形态和进化压力.
主要方法:
- 为Sternorrhyncha建立最大的线粒体基因组数据集.
- 遗传学树的分析.
- 对线索基因基因排列和选择压力的比较分析.
主要成果:
- 证实了 Coccoidea 和 Aphidoidea 之间的姐妹群关系.
- 证明了Aclerdidae与科的关系.
- 在Coccoidea和Aleyrodoidea中确定了流行基因转位和积极选择,与物种多样性相关.
- 观测到虫线粒体基因的负选择和低变异,与它们的多样化形成鲜明对比.
结论:
- 这项研究提供了基于线粒体基因组学的Sternorrhyncha强有力的系谱.
- 线粒体基因动力学,包括重组和选择压力,为不同的Sternorrhyncha群体的多样化模式提供了洞察力.
- 这些发现突出了虫多样化的悖论,尽管保留了线粒体基因组变化.
相关概念视频
01:21Frequency-dependent Selection
22.2K
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.
22.2K
01:09Mutation, Gene Flow, and Genetic Drift
59.5K
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
59.5K
01:46Types of Selection
41.5K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
41.5K
01:07Speciation Rates
21.4K
Overview
21.4K
02:32Exon Recombination
3.7K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.7K
02:32Position-effect Variegation
6.6K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
6.6K