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相关概念视频

Viral Recombination00:57

Viral Recombination

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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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The Antiviral System of Bacteria and Archaea: CRISPR01:23

The Antiviral System of Bacteria and Archaea: CRISPR

623
CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this...
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Viral Mutations00:36

Viral Mutations

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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...
39.6K
Infection01:20

Infection

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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
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Viruses with RNA Genomes01:29

Viruses with RNA Genomes

824
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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相关实验视频

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A Comparative Approach to Characterize the Landscape of Host-Pathogen Protein-Protein Interactions
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A Comparative Approach to Characterize the Landscape of Host-Pathogen Protein-Protein Interactions

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重复模仿病原体相关的模式在一个巨大的进化景观.

Petr Šulc1, Andrea Di Gioacchino2, Alexander Solovyov3

  • 1School of Molecular Sciences and Center for Molecular Design and Biomimetics, The Biodesign Institute, Arizona State University, Tempe, AZ, USA; School of Natural Sciences, Department of Bioscience, TU Munich, Garching, Germany.

Cell genomics
|September 25, 2025
PubMed
概括

疾病细胞可以通过转录沉默的DNA来激活先天免疫力. 我们的框架量化了这种病毒模仿,揭示了维护这些遗传元素的进化压力.

关键词:
癌症 癌症 癌症 癌症 癌症基因组的演化 基因组的演化这是先天免疫力.数学模型是指数学模型.没有编码的RNA.病原体相关的分子模式重复的元素是重复的元素.统计物理学的统计物理.病毒模仿病毒模仿

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Automated Separation of C. elegans Variably Colonized by a Bacterial Pathogen
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Author Spotlight: Characterizing DNA Replication of Pathogenic Repeats to Uncover Mechanisms of Replication Fork Stalling and Expansion
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科学领域:

  • 基因组学和分子生物学
  • 免疫学 免疫学 免疫学
  • 进化生物学 进化生物学
  • 统计物理 统计物理

背景情况:

  • 许多人类疾病都涉及重复的DNA元素的转录,这些元素通常被沉默.
  • 这些转录的元素含有病原体相关的分子模式 (PAMPs),通过模式识别受体 (PRRs) 激活天生的免疫系统,这一过程称为病毒模仿.
  • 了解推动这些PAMP的出现和保留的进化力量至关重要.

研究的目的:

  • 开发一个统计物理框架来量化病毒模拟.
  • 识别特定的重复性DNA元素,这些元素在真核生物基因组中充当潜在的病毒模仿者.
  • 提出进化假设,解释在重复性DNA中PAMP的丰富和维护.

主要方法:

  • 开发了一个统计物理框架来测量丰富PAMP的"选择性力".
  • 将PAMP丰富与全基因组参考分布进行比较.
  • 通过识别真核基因组中与不同PRR结合的特定重复来验证预测.

主要成果:

  • 在真核基因组的各种重复家族中确定了潜在的病毒模仿者.
  • 证明了共享的进化机制可能驱动这些PAMP的出现和保留.
  • 表明,由于对重复性DNA的选择作用,PAMPs可以被丰富.

结论:

  • 病毒模仿是一种疾病的新兴标志,由转录的重复DNA驱动.
  • 提出了两个进化假设",重复中心"和"生物中心",以解释PAMP维护.
  • 这些发现表明,PAMP是重复扩张的组成部分,或作为细胞内在的调节机制,防止转录失调.