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FokI-RYdCas9 Mediates Nearly PAM-Less and High-Precise Gene Editing in Human Cells

文献类型： 外文期刊

作者： Di Li;Yaqi Cao;Long Xie;Chenfei He;Danrong Jiao;Mengxue Ma;Zhenrui Zuo;Erwei Zuo;Xiaogan Yang

作者机构：

关键词： （1-2-2）fdCas9;FokI-RYdCas9;high-precise gene editing;PAM-less

期刊名称： Current Issues in Molecular Biology

ISSN： 1467-3037

年卷期： 2024 年 46 卷 5 期

页码：

收录情况： SCIE（2024版）

摘要： The demand for high-precision CRISPR/Cas9 systems in biomedicine is experiencing a notable upsurge. The editing system fdCas9 employs a dual-sgRNA strategy to enhance editing accuracy. However, the application of fdCas9 is constrained by the stringent requirement for two protospacer adjacent motifs (PAMs) of Cas9. Here, we devised an optimized editor, fRYdCas9, by merging FokI with the nearly PAM-less RYdCas9 variant, and two fRYdCas9 systems formed a dimer in a proper spacer length to accomplish DNA cleavage. In comparison to fdCas9, fRYdCas9 demonstrates a substantial increase in the number of editable genomic sites, approximately 330-fold, while maintaining a comparable level of editing efficiency. Through meticulous experimental validation, we determined that the optimal spacer length between two FokI guided by RYdCas9 is 16 base pairs. Moreover, fRYdCas9 exhibits a near PAM-less feature, along with no on-target motif preference via the library screening. Meanwhile, fRYdCas9 effectively addresses the potential risks of off-targets, as analyzed through whole genome sequencing (WGS). Mouse embryonic editing shows fRYdCas9 has robust editing capabilities. This study introduces a potentially beneficial alternative for accurate gene editing in therapeutic applications and fundamental research.

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