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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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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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From DNA to Protein

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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Transfer RNA Synthesis02:36

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
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Non-LTR Retrotransposons03:18

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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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在人类乳头瘤病毒59型中解码码子的使用.

Xiaochun Tan1, Wenyi Zhou1, Shunyou Jing2

  • 1Department of Laboratory Medicine, The First Hospital of Jiaxing, Affiliated Hospital of Jiaxing University, 1882 South Central Road, Jiaxing, 314000, China.

Virus genes
|March 4, 2025
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概括

人类乳头瘤病毒59型 (HPV-59) 表现出轻微的编码器使用偏差,偏好A/T结尾的编码器和不足的CpG站点. 自然选择和突变压力塑造了其编码子的使用,影响了疫苗的开发.

关键词:
在Codon的使用中,存在偏见.主机适应性 主机适应性人类乳头瘤病毒59型自然选择是自然选择.相对同义词的codon使用相对同义词

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科学领域:

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

背景情况:

  • 人类乳头瘤病毒59型 (HPV-59) 是一种高风险的HPV亚型,与各种癌症有关.
  • 了解HPV-59编码子的使用对于病毒行为洞察和疫苗优化至关重要.
  • 对于HPV-59的使用模式仍然在很大程度上未被探索.

研究的目的:

  • 为了研究人类乳头瘤病毒59型 (HPV-59) 的代使用模式.
  • 为了确定影响HPV-59编码子使用偏差的因素.
  • 评估HPV-59及其宿主转化机制之间的进化关系,以设计疫苗.

主要方法:

  • 对HPV-59基因组序列的分析.
  • 应用编码器使用偏差指标 (例如,有效编码器数量,平价规则2).
  • 评估突变压力和自然选择影响.
  • 使用CAI和RCSI等指数评估宿主病毒的翻译兼容性.

主要成果:

  • HPV-59显示出轻微的编码器使用偏差,偏好的是以A/T结尾的编码器.
  • 在HPV-59基因组中,CpG二核酸显著不足,这可能是因为免疫规避.
  • 突变压力和自然选择都影响了密码体的使用,自然选择占主导地位.
  • HPV-59编码子的使用显示了与人类翻译机制的适度对齐.

结论:

  • 在HPV-59中使用Codon是由突变力量和自然选择之间的平衡所塑造的.
  • 观察到的编码子偏差和CpG不足代表性为HPV-59的生物学和免疫逃避策略提供了洞察力.
  • 这些发现为开发更有效的HPV-59疫苗提供了基础,通过考虑病毒编码子的使用和宿主兼容性.