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相关概念视频

Genome Annotation and Assembly03:36

Genome Annotation and Assembly

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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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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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相关实验视频

Updated: Jul 7, 2025

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms
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Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms

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转录组装和注释:偏差和调整.

Qimin Zhang1, Mingfu Shao1,2

  • 1Department of Computer Science and Engineering, School of Electrical Engineering and Computer Science, The Pennsylvania State University, University Park, Pennsylvania, United States of America.

PLoS computational biology
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概括
此摘要是机器生成的。

转录注释显著影响基因表达分析和转录组装. 不同的注释,特别是关于内部保留的注释,可以导致关于汇编器性能的矛盾结论. 一个新的工具,irtool,有助于产生没有内子保留的组件.

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Improving Small RNA-seq: Less Bias and Better Detection of 2'-O-Methyl RNAs
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相关实验视频

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科学领域:

  • 生物信息学是一种生物信息学.
  • 计算生物学 计算生物学
  • 基因组学就是基因组学.

背景情况:

  • 转录注释对于基因表达分析和转录组装准确性至关重要.
  • 主要注释来源 (RefSeq,Ensembl/GENCODE) 之间的差异会影响下游分析.
  • 对注释选择对转录组合评估的影响尚未完全理解.

研究的目的:

  • 调查不同转录注释对转录组装评估的影响.
  • 在使用不同的注释时了解矛盾结论背后的原因.
  • 开发一种方法,通过解决注释偏差来改善转录组装.

主要方法:

  • 使用不同的注释来源对转录组装结果进行比较分析.
  • 结构性比较不同级别的注释,重点关注内部链差异.
  • 在注释和组装的成绩单中检查生物型分布,识别偏差.
  • 开发和评估一个管道,包括一个工具 (irtool) 排除内置保留.

主要成果:

  • 不同的注释可以导致关于转录汇编器性能的相反结论.
  • 标注之间的主要结构差异在内部链层面.
  • 有一个显著的偏见存在于注释和组装转录与内置保留.
  • 在irtool管道成功地产生了组件,减少了内部保留.

结论:

  • 注释选择极大地影响了转录组装评估,可能产生相互矛盾的结果.
  • 在注释和组装中的intron保留偏差解释了观察到的差异.
  • irtool管道提供了一个解决方案,以减轻转录组装中的内部保留偏差.
  • 为根据应用需求选择合适的组装工具提供了指导.