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相关概念视频

Leaky Scanning02:28

Leaky Scanning

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Synteny and Evolution02:31

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Evolutionary Relationships through Genome Comparisons02:54

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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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.
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相关实验视频

Updated: Jul 1, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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通过同义代码子模式对CaMV-宿主共同进化的研究.

Mahin Pouresmaeil1, Shahnam Azizi-Dargahlou2

  • 1Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran.

Journal of basic microbiology
|March 4, 2024
PubMed
概括

花草马赛克病毒 (CaMV) 显示了代码使用偏差,使其基因适应于宿主生物体,如Brassica oleracea和Brassica rapa. 自然选择是这种适应的主要驱动因素,确保有效的病毒复制和传播.

关键词:
这就是为什么CaMVMV.鱼的适应性鱼的适应性共同进化的共同进化植物地理学 植物地理学病毒主机互动互动

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科学领域:

  • 病毒学 病毒学
  • 分子生物学分子生物学
  • 基因组学就是基因组学.

背景情况:

  • 花草马赛克病毒 (CaMV) 是一种全球分布的植物病毒,具有双链DNA基因组.
  • 遗传学分析揭示了CaMV分离物的两个主要组,伊朗菌株表现出显著的遗传多样性.

研究的目的:

  • 调查CaMV中的子使用偏差及其与宿主生物的关系.
  • 为了确定驱动CaMV中的子使用模式的进化力量.

主要方法:

  • 对121个CaMV分离物的遗传学分析.
  • 丁核酸概率比率分析和相对同义符号使用 (RSCU) 分析.
  • 编适应指数 (CAI) 和相对编脱优化指数 (RCDI) 的计算.
  • 有效编码数 (ENC) -图表和中性图表分析.

主要成果:

  • 核酸A是CaMV基因组中最丰富的 (36.95%);TC二核酸过多,而CG二核酸不足.
  • CaMV显示出显著的子使用偏差,有适应于易受宿主如Brassica oleracea和Brassica rapa (CAI>0.8) 的证据.
  • 编码逆转录酶的基因和外套蛋白质具有最高的CAI (0.83),表明对维生产的最佳表达.
  • 自然选择被确定为影响CaMV密码子使用偏差的主要因素.

结论:

  • CaMV基因与其宿主共同进化,优化基因表达,以有效感染和传播.
  • 这项研究强调了自然选择在塑造病毒密码体的使用和适应过程中的作用.
  • 了解CaMV的分子机制可以为十字植物作物的疾病管理策略提供信息.