Highly efficient C-to-T and A-to-G base editing in a Populus hybrid.
Highly efficient C-to-T and A-to-G base editing in a Populus hybrid.
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DOI:
10.1111/pbi.13581
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发表时间:
2021-06
影响因子:
13.8
通讯作者:
Qi Y
中科院分区:
文献类型:
--
作者:
Li G;Sretenovic S;Eisenstein E;Coleman G;Qi Y
CRISPR-Cas-based genome editing technologies hold great potential for genetic research and bioengineering in trees. CRISPR-Cas9 was previously demonstrated to be a highly efficient genome editing system in poplar (Zhou et al., 2015). However, these applications only used the nuclease activity of Cas9 for targeted mutagenesis. By contrast, dead Cas9 (dCas9)-derived base editors can install specific base changes in a plant genome. Cytosine base editors (CBEs) can introduce C-to-T and occasionally C-to-G base changes (Komor et al., 2016; Nishida et al., 2016) and adenine base editors (ABEs) can generate A-to-G base changes (Gaudelli et al., 2017). CBEs can be applied for constructing premature stop codons, while both CBEs and ABEs can be used for making amino acid codon changes or altering RNA splicing sites or cis-regulatory elements in tailored applications. Despite their promising potential, base editing tools have not been fully established in trees. To develop efficient base editors in trees, we worked on a Populus hybrid (Populus tremula 9 P. alba hybrid clone INRA 717-1B4). We first tried to establish an efficient C-to-T base editing system by comparing two promising CBEs, PmCDA1-BE3 and A3A/Y130F-BE3, which were in a base editor 3 (BE3) configuration by fusion of a cytidine deaminase and a uracil DNA glycosylase inhibitor (UGI) to the Cas9D10A nickase (Figure 1a). A PmCDA1 base editor in the BE3 configuration was previously demonstrated in rice (Tang et al., 2018). Recently, high-efficiency base editing in rice, wheat and potato was demonstrated with A3A-BE3 (Zong et al., 2018). Both PmCDA1-BE3 and A3A-BE3 showed much higher editing efficiencies than the widely used rAPOBEC1-BE3 in plants (Tang et al., 2018; Zong et al., 2018). Further, introduction of the Y130F mutation to A3A-BE3 appeared to be even more potent in making C-to-T conversions in human cells, especially at methylated target sites (Wang et al., 2018). Therefore, A3A/Y130F-BE3 is a promising CBE for testing in plants.
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