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- W4224253760 abstract "Predictable DNA off-target effect is one of the major safety concerns for the application of cytosine base editors (CBEs). To eliminate Cas9-dependent DNA off-target effects, we designed a novel effective CBE system with dual guiders by combining CRISPR with transcription activator-like effector (TALE). In this system, Cas9 nickase (nCas9) and cytosine deaminase are guided to the same target site to conduct base editing by single-guide RNA (sgRNA) and TALE, respectively. However, if nCas9 is guided to a wrong site by sgRNA, it will not generate base editing due to the absence of deaminase. Similarly, when deaminase is guided to a wrong site by TALE, base editing will not occur due to the absence of single-stranded DNA. In this way, Cas9- and TALE-dependent DNA off-target effects could be completely eliminated. Furthermore, by fusing TALE with YE1, a cytidine deaminase with minimal Cas9-independent off-target effect, we established a novel CBE that could induce efficient C-to-T conversion without detectable Cas9- or TALE-dependent DNA off-target mutations. Predictable DNA off-target effect is one of the major safety concerns for the application of cytosine base editors (CBEs). To eliminate Cas9-dependent DNA off-target effects, we designed a novel effective CBE system with dual guiders by combining CRISPR with transcription activator-like effector (TALE). In this system, Cas9 nickase (nCas9) and cytosine deaminase are guided to the same target site to conduct base editing by single-guide RNA (sgRNA) and TALE, respectively. However, if nCas9 is guided to a wrong site by sgRNA, it will not generate base editing due to the absence of deaminase. Similarly, when deaminase is guided to a wrong site by TALE, base editing will not occur due to the absence of single-stranded DNA. In this way, Cas9- and TALE-dependent DNA off-target effects could be completely eliminated. Furthermore, by fusing TALE with YE1, a cytidine deaminase with minimal Cas9-independent off-target effect, we established a novel CBE that could induce efficient C-to-T conversion without detectable Cas9- or TALE-dependent DNA off-target mutations." @default.
- W4224253760 created "2022-04-26" @default.
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- W4224253760 date "2022-07-01" @default.
- W4224253760 modified "2023-10-18" @default.
- W4224253760 title "Eliminating predictable DNA off-target effects of cytosine base editor by using dual guiders including sgRNA and TALE" @default.
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- W4224253760 doi "https://doi.org/10.1016/j.ymthe.2022.04.010" @default.
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