Genome editing mediated by SpCas9 variants with broad non-canonical PAM compatibility in plants
文献类型： 外文期刊
作者： Li, Juan 1 ; Xu, Rongfang 1 ; Qin, Ruiying 1 ; Liu, Xiaoshuang 1 ; Kong, Fanna 1 ; Wei, Pengcheng 1 ;
作者机构： 1.Anhui Acad Agr Sci, Rice Res Inst, Key Lab Rice Genet Breeding Anhui Prov, Hefei 230031, Peoples R China
关键词： SpCas9 variant; PAM; rice; genome editing; base editing
期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）
ISSN： 1674-2052
年卷期： 2021 年 14 卷 2 期
页码：
收录情况： SCI
摘要： Streptococcus pyogenes Cas9 (SpCas9) is the most widely used genome editing tool in plants. The editing induced by SpCas9 strictly requires a canonical NGG protospacer-adjacent motif (PAM), significantly limiting its scope of application. Recently, five SpCas9 variants, SpCas9-NRRH, SpCas9-NRCH, SpCas9NRTH, SpG, and SpRY, were developed to recognize non-canonical PAMs in human cells. In this study, these variants were engineered for plant genome editing, and their targeted mutagenesis capabilities were comprehensively examined at various canonical and non-canonical PAM sites in rice (Oryza sativa) by stable transformation. Moreover, both cytosine base editors using a rat APO-BEC1 or a human APO-BEC3a and adenine base editors using a directly evolved highly compatible TadA*-8e deaminase were developed from these SpCas9 variants. Our results demonstrated that the developed SpCas9 variants-based base editors readily generated conversions between C.G and T.A in the target sites with non-canonical PAMs in transgenic rice lines. Collectively, the toolbox developed in this study substantially expands the scope of SpCas9-mediated genome editing and will greatly facilitate gene disruption and precise editing in plants.
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