CRISPR-Cas12a offers a convenient tool for multiplex genome editing in rice. However, the CRISPR-Cas12a system displays variable editing efficiency across genomic loci, with marked influence by CRISPR RNAs(crRNAs). To...CRISPR-Cas12a offers a convenient tool for multiplex genome editing in rice. However, the CRISPR-Cas12a system displays variable editing efficiency across genomic loci, with marked influence by CRISPR RNAs(crRNAs). To improve the efficiency of the CRISPR-Cas12a system for multiplex genome editing, we identified various architectures and expression strategies for crRNAs. Transformation of binary vectors loaded with engineered CRISPR-Cas12a systems into rice calli and subsequent sequencing revealed that a modified tRNA-crRNA array not only efficiently achieved rice multiplex genome editing, but also successfully edited target sites that were not edited by the crRNA array. This improvement contributes to the application of the CRISPR-Cas12a system in plant genome editing, especially for genomic loci that have hitherto been difficult to edit.展开更多
基金funded by the National Key Research and Development Program of China(2016YFD0101800)the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciencesthe National GMO New Variety Breeding Program of China(2016ZX08011-001)。
文摘CRISPR-Cas12a offers a convenient tool for multiplex genome editing in rice. However, the CRISPR-Cas12a system displays variable editing efficiency across genomic loci, with marked influence by CRISPR RNAs(crRNAs). To improve the efficiency of the CRISPR-Cas12a system for multiplex genome editing, we identified various architectures and expression strategies for crRNAs. Transformation of binary vectors loaded with engineered CRISPR-Cas12a systems into rice calli and subsequent sequencing revealed that a modified tRNA-crRNA array not only efficiently achieved rice multiplex genome editing, but also successfully edited target sites that were not edited by the crRNA array. This improvement contributes to the application of the CRISPR-Cas12a system in plant genome editing, especially for genomic loci that have hitherto been difficult to edit.
