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相关概念视频

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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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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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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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产生编码抗HBV设计表观基因组的mRNA

Prashika Singh1, Tafadzwa Mlambo2, Kristie Bloom1

  • 1Wits/SAMRC Antiviral Gene Therapy Research Unit, Infectious Diseases and Oncology Research Institute (IDORI), Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.

Methods in molecular biology (Clifton, N.J.)
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概括
此摘要是机器生成的。

新的表观基因组编辑工具使用通过mRNA传递的设计表观基因组修饰剂 (DEM) 来准和静止慢性乙型肝炎病毒 (HBV) 复制. 这种方法为持续的HBV治疗提供了一个有前途的非变异性策略.

关键词:
CpG 岛屿其他国家没有HBV在体外转录

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科学领域:

  • 表观遗传学
  • 病毒学
  • 分子生物学

背景情况:

  • 慢性乙型肝炎病毒 (HBV) 感染全球超过2.57亿人,导致严重的肝病死亡.
  • 目前的抗病毒疗法在消除持续存在的HBV共价封闭圆形DNA (cccDNA) 储存器的能力上是有限的.
  • 表观基因组编辑提供了一种针对病毒基因表达的新非变异性策略.

研究的目的:

  • 开发和评估mRNA编码的设计表观基因组修饰剂 (DEM) 用于针对HBV的表观基因沉默.
  • 通过去除免疫刺激双链RNA (dsRNA) 来优化mRNA的产生.
  • 在细胞培养中评估DEM介导的HBVDNA转录抑制的有效性.

主要方法:

  • 在关键HBV开放读取框架 (ORF) 中编码CpG岛屿的mRNADEMs的产生.
  • 在pT7 ((AG) 平台上的DEM序列的体外转录.
  • 净化mRNA以去除dRNA污染物,增强其表达.
  • 用合成的mRNA感染培养细胞并评估HBVDNA的转录抑制.

主要成果:

  • 成功合成用于HBV表观基因组修饰的编码DEM.
  • 通过dSRNA去除协议实现了改善的mRNA表达.
  • 通过DEMs在培养细胞中证明了HBVDNA的向转录抑制.

结论:

  • 通过mRNA输送的DEM代表了长期HBV表观遗传沉默的可行策略.
  • 这种方法最大限度地降低了与其他基因编辑技术相关的基因组整合和非目标效应的风险.
  • 在慢性HBV感染中,表观遗传疗法可能具有持久的治疗效益.