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相关概念视频

Global Regulatory Systems01:28

Global Regulatory Systems

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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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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Mutation, Gene Flow, and Genetic Drift01:09

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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).
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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Genetic Modification of Cyanobacteria by Conjugation Using the CyanoGate Modular Cloning Toolkit
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限制修改系统 具体针对GGATC,GATGC和GATGG. 第1部分 1. 进化和生态学 进化和生态学

Sergey Spirin1,2,3, Ivan Rusinov4, Olga Makarikova5

  • 1Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119234, Russia. sas@belozersky.msu.ru.

Biochemistry. Biokhimiia
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概括

这项研究揭示了限制修饰系统的进化途径,详细介绍了蛋白质进化和基因转移事件. 研究结果揭示了这些关键细菌防御机制的多样性和特异性.

关键词:
在DNA甲基转移酶中.横向基因转移是指水平基因转移.分子进化分子演变.限制内核酶的限制限制 修改 系统限制

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 遗传学是一种遗传学.
  • 生物信息学是一种生物信息学.

背景情况:

  • 限制修改 (RM) 系统对于细菌防御和基因组完整性至关重要.
  • 这些系统包括DNA甲基转移酶和限制性内核酶,可识别特定的DNA序列.
  • 了解RM系统的进化,可以了解基因组进化和水平基因转移.

研究的目的:

  • 为了研究RM系统中蛋白质的进化历史.
  • 确定限制性内核酶和DNA甲基转移酶的进化关系和特异性.
  • 在RM进化中识别基因和系统转移的实例.

主要方法:

  • 限制性内核酶 (REase_AlwI家族) 和DNA甲基转移酶 (MethyltransfD12家族) 域的序列相似性分析.
  • 遗传学分析以基于序列相似性和特异性来构建进化类.
  • 比较基因组学检测水平基因转移事件.

主要成果:

  • 研究的RM系统识别了三个不同的DNA序列:GGATC,GATGC或GATGG.
  • 限制性内核酶形成了三个分类,对应于RM系统的特异性.
  • DNA甲基转移酶域分为两个不同的分类,其中系统内的域属于不同的组,并表现出基于特异性的分类.
  • 发现了整个RM系统和个体基因的广泛水平转移的证据,包括具有改变特异性的甲基转移酶.

结论:

  • RM系统的进化是由垂直遗传和显著的水平基因转移形成的.
  • 水平转移导致了RM系统特异性的多样化和新型甲基转移酶的出现.
  • 这项研究揭示了复杂的进化关系,包括那些与孤儿DNA甲基转移酶相关的关系.