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相关概念视频

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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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AsCas12a可以容忍在目标DNA中的插入.

Santosh R Rananaware1, Grace M Shoemaker1,2, Brianna L M Pizzano1

  • 1Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, United States.

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概括

亚胺科克斯 (Acidaminococcus sp.) 是一种菌. 与其他CRISPR-Cas12a酶不同,Cas12a (AsCas12a) 独特地耐受其DNA点的插入. 这种灵活性与特定的α螺旋相结合,使得在诊断和基因组编辑领域的新应用成为可能.

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 遗传学 是一个
  • 生物化学 生物化学

背景情况:

  • CRISPR-Cas12a酶对于基因组编辑和诊断至关重要.
  • 高效的Cas12a功能通常需要完美的导向RNA-DNA互补性.
  • 在Cas12a ortologs中的变化可能会导致独特的功能性质.

研究的目的:

  • 为了研究不同CRISPR-Cas12aortologs的目标DNA结合和分裂活性.
  • 为了描述Acidaminococcus sp.的插入耐受性. 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯12a (AsCas12a). 卡斯
  • 为了阐明AsCas12a独特的插入容忍的结构基础.

主要方法:

  • 对12名Cas12a ортолог与包含插入的DNA点的活动进行比较分析.
  • 在试验室中使用单链DNA (ssDNA) 和双链DNA (dsDNA) 的裂解测定.
  • 对AsCas12a的结构分析,包括域特定的删除 (例如,WED域α-螺旋).

主要成果:

  • AsCas12a在其目标DNA中对插入 (1-20个核酸) 具有显著的耐受性,与其他测试的ortologs不同.
  • 这种耐受性观察到ssDNA和特定dsDNA配置上的cis和trans-cleavage活动.
  • 在AsCas12a的WED域中,一个独特的α螺旋被确定为插入耐受性的关键;其删除取消了这个属性.

结论:

  • AsCas12a具有独特的,独立于序列的插入容忍机制.
  • 这个属性在结构上取决于WED域内的特定α螺旋.
  • AsCas12a的插入耐受性为SNP检测和PAM灵活DNA裂变等先进应用提供了潜力.