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相关概念视频

Genome Copying Errors02:46

Genome Copying Errors

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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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Exon Recombination02:32

Exon Recombination

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Ribosome Profiling

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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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.
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相关实验视频

Updated: Jul 11, 2025

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms
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EASTR:识别和消除多个表突基因中的系统调整错误.

Ida Shinder1,2, Richard Hu3,4, Hyun Joo Ji3,4

  • 1Cross Disciplinary Graduate Program in Biomedical Sciences, Johns Hopkins School of Medicine, Baltimore, MD, USA. ishinde1@jhmi.edu.

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|November 8, 2023
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概括

广泛使用的RNA测序工具可以创建错误的基因拼接对齐. 一个名为EASTR (Emending Alignments of Spliced Transcript Reads) 的新工具纠正了这些错误,提高了基因表达分析的准确性.

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科学领域:

  • 基因组学就是基因组学.
  • 生物信息学是一种生物信息学.
  • 分子生物学分子生物学

背景情况:

  • 准确的RNA与基因组对齐对于生物医学研究中的基因表达分析至关重要.
  • 像STAR和HISAT2这样的现有拼接感知对齐器可以产生错误的拼接对齐,特别是在重复序列附近.
  • 这些错误可能导致"幽灵"内核和错误拼接的转录,影响下游分析甚至基因组注释.

研究的目的:

  • 为了解决常见的RNA测序工具引入的错误拼接对齐问题.
  • 介绍EASTR (Emending Alignments of Spliced Transcript Reads),一种用于检测和删除虚假拼接对齐和转录的新型软件工具.
  • 为了提高RNA-seq数据分析和基因组注释的准确性.

主要方法:

  • 开发EASTR,这是一种软件工具,可以识别内部侧边区域之间的序列相似性,以检测错误的对齐.
  • 应用EASTR对标准RNA测序工作流程生成的对齐文件.
  • 在现有的基因组注释数据库中使用EASTR来识别和纠正错误的注释.

主要成果:

  • EASTR有效地检测和删除由重复序列引起的错误拼接对齐和转录.
  • 应用EASTR可以提高各种物种间拼接对齐的准确性,包括人类,玉米和Arabidopsis thaliana.
  • 在转录组装之前使用EASTR显著减少了假阳性内子,外子和转录,从而导致更准确的组装转录.
  • 在基因组注释参考数据库中,EASTR成功识别并纠正了错误注释的转录.

结论:

  • 通过纠正对齐错误,EASTR是提高RNA测序数据分析准确度的宝贵工具.
  • 该软件提高了基因表达研究的可靠性和基因组注释的质量.
  • EASTR检测序列相似性的能力为识别人工拼接事件提供了一个强大的方法.