Functional correction of CFTR mutations in human airway epithelial cells using adenine base editors.

Functional correction of CFTR mutations in human airway epithelial cells using adenine base editors.
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DOI:
10.1093/nar/gkab788
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发表时间:
2021-10-11
影响因子:
14.9
通讯作者:
McCray PB
McCray PB
中科院分区:
生物学2区
文献类型:
--
作者:
Krishnamurthy S;Traore S;Cooney AL;Brommel CM;Kulhankova K;Sinn PL;Newby GA;Liu DR;McCray PB

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CFTR基因中导致过早终止密码子或剪接缺陷的突变会导致囊性纤维化(CF),并且不适合通过小分子调节剂进行治疗。在这里,我们研究使用腺嘌呤碱基编辑器(ABE)核糖核蛋白(RNP)将A·T转换为G·C碱基对作为三种CF引起突变的治疗策略。使用ABE RNP,我们在人气道上皮细胞中校正了过早终止密码子突变(R553 X和W1282 X)和剪接位点突变(3849 + 10 kb C > T)。在ABE递送后,DNA测序显示这些致病性突变的校正效率达到38-82%,具有最小的旁观者编辑或插入缺失。该编辑范围足以在来自CF患者的原代上皮细胞和CF患者衍生的细胞系中获得CFTR依赖性阴离子通道活性的功能校正。这些结果证明了碱基编辑RNP修复目前用批准的治疗剂不可治疗的CFTR突变的效用。
Mutations in the CFTR gene that lead to premature stop codons or splicing defects cause cystic fibrosis (CF) and are not amenable to treatment by small-molecule modulators. Here, we investigate the use of adenine base editor (ABE) ribonucleoproteins (RNPs) that convert A•T to G•C base pairs as a therapeutic strategy for three CF-causing mutations. Using ABE RNPs, we corrected in human airway epithelial cells premature stop codon mutations (R553X and W1282X) and a splice-site mutation (3849 + 10 kb C > T). Following ABE delivery, DNA sequencing revealed correction of these pathogenic mutations at efficiencies that reached 38–82% with minimal bystander edits or indels. This range of editing was sufficient to attain functional correction of CFTR-dependent anion channel activity in primary epithelial cells from CF patients and in a CF patient-derived cell line. These results demonstrate the utility of base editor RNPs to repair CFTR mutations that are not currently treatable with approved therapeutics.
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