CRISPR C-to-G base editors for inducing targeted DNA transversions in human cells.

CRISPR C-to-G base editors for inducing targeted DNA transversions in human cells.
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DOI:
10.1038/s41587-020-0609-x
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发表时间:
2021-01
影响因子:
46.9
通讯作者:
Joung JK
Joung JK
中科院分区:
工程技术1区
文献类型:
--
作者:
Kurt IC;Zhou R;Iyer S;Garcia SP;Miller BR;Langner LM;Grünewald J;Joung JK

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CRISPR引导的DNA胞嘧啶和腺嘌呤碱基编辑器(CBE和ABE)广泛用于许多应用,但主要产生DNA碱基转换(即,嘧啶到嘧啶或嘌呤到嘌呤)。在这里,我们描述了两个碱基编辑器架构的工程设计,其可以有效地诱导靶向的C至G碱基颠换,同时降低不需要的C至W(W = A或T)和插入缺失突变的水平。这些C-to-G碱基编辑器之一(CGBE 1)由RNA引导的Cas9切口酶、E.大肠杆菌衍生的尿嘧啶DNA N-糖基化酶(eUNG)和大鼠APOBEC 1胞苷脱氨酶变体(R33 A),先前显示具有降低的脱靶RNA和DNA编辑活性。我们发现CGBE 1可以有效地诱导C到G编辑,特别是在人类细胞中富含AT的序列背景下。我们还去除了eUNG结构域以产生miniCGBE 1,这降低了插入缺失频率,但仅适度降低了编辑效率。CGBE 1和miniCGBE 1实现了C-to-G编辑,并将作为优化C-to-G基础编辑器的基础,用于研究和治疗应用。一种新的碱基编辑器可以在人类细胞中创建C到G碱基的变化。
CRISPR-guided DNA cytosine and adenine base editors (CBEs and ABEs) are widely used for many applications but primarily create DNA base transitions (i.e., pyrimidine-to-pyrimidine, or purine-to-purine). Here we describe the engineering of two base editor architectures that can efficiently induce targeted C-to-G base transversions, with reduced levels of unwanted C-to-W (W = A or T) and indel mutations. One of these C-to-G base editors (CGBE1), consists of an RNA-guided Cas9 nickase, an E. coli-derived uracil DNA N-glycosylase (eUNG), and a rat APOBEC1 cytidine deaminase variant (R33A) previously shown to have reduced off-target RNA and DNA editing activities. We show that CGBE1 can efficiently induce C-to-G edits, particularly in AT-rich sequence contexts in human cells. We also removed the eUNG domain to yield miniCGBE1, which reduced indel frequencies but only modestly decreased editing efficiency. CGBE1 and miniCGBE1 enable C-to-G edits and will serve as a basis for optimizing C-to-G base editors for research and therapeutic applications. A new base editor enables the creation of C-to-G base changes in human cells.
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