Home > Archive>Volume 64, Issue 9, 2024 >3091-3104. DOI:10.13343/j.cnki.wsxb.20240099
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Origin of CRISPR-Cas: progress in research and applications of TnpB and IscB
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    Abstract:

    CRISPR-Cas is a defense system ubiquitous in bacteria and archaea. It has been successfully applied in genome editing in a variety of organisms. At present, CRISPR-Cas9 and CRISPR-Cas12a are the most widely used genome editing tools. However, the large protein sizes of Cas9 and Cas12a (more than 1 000 amino acids (aa)) hinder their delivery. TnpB and IscB (about 400 aa) encoded by the transposon family are considered ancestors of Cas12 and Cas9, respectively, whereas their functions are revealed just recently. They are named as obligate mobile element-guided activity (OMEGA), with the associated RNA named ωRNA. Since then, the OMEGA system has become one of the research hotspots in genome editing. OMEGA systems are diverse, with wide distribution in all the three domains of life. The in-depth research on the OMEGA system will aid in the development of new genome editing tools that are streamlined, efficient, and safe. Here, we reviewed the discovery history, structural characteristics, mechanisms of cleavage, and genome editing applications of OMEGA systems, aiming to lay a foundation for the development and optimization of genome editing tools.

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SHI Guangliang, LI Wei, XIANG Hua, GONG Luyao. Origin of CRISPR-Cas: progress in research and applications of TnpB and IscB. [J]. Acta Microbiologica Sinica, 2024, 64(9): 3091-3104

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  • Received:February 07,2024
  • Revised:May 31,2024
  • Online: August 30,2024
  • Published: September 04,2024
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