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基于同源重组的干细胞衍生 clade F AAV 介导高效基因组编辑。

Stem cell-derived clade F AAVs mediate high-efficiency homologous recombination-based genome editing.

机构信息

Department of Surgery, Beckman Research Institute, City of Hope Medical Center, Duarte, CA 91010.

Homology Medicines, Inc., Bedford, MA 01730.

出版信息

Proc Natl Acad Sci U S A. 2018 Jul 31;115(31):E7379-E7388. doi: 10.1073/pnas.1802343115. Epub 2018 Jul 17.

Abstract

The precise correction of genetic mutations at the nucleotide level is an attractive permanent therapeutic strategy for human disease. However, despite significant progress, challenges to efficient and accurate genome editing persist. Here, we report a genome editing platform based upon a class of hematopoietic stem cell (HSC)-derived clade F adeno-associated virus (AAV), which does not require prior nuclease-mediated DNA breaks and functions exclusively through BRCA2-dependent homologous recombination. Genome editing is guided by complementary homology arms and is highly accurate and seamless, with no evidence of on-target mutations, including insertion/deletions or inclusion of AAV inverted terminal repeats. Efficient genome editing was demonstrated at different loci within the human genome, including a safe harbor locus, AAVS1, and the therapeutically relevant IL2RG gene, and at the murine Rosa26 locus. HSC-derived AAV vector (AAVHSC)-mediated genome editing was robust in primary human cells, including CD34 cells, adult liver, hepatic endothelial cells, and myocytes. Importantly, high-efficiency gene editing was achieved in vivo upon a single i.v. injection of AAVHSC editing vectors in mice. Thus, clade F AAV-mediated genome editing represents a promising, highly efficient, precise, single-component approach that enables the development of therapeutic in vivo genome editing for the treatment of a multitude of human gene-based diseases.

摘要

精确纠正核苷酸水平的基因突变是人类疾病有吸引力的永久性治疗策略。然而,尽管取得了重大进展,但高效和准确的基因组编辑仍然存在挑战。在这里,我们报告了一种基于一类造血干细胞(HSC)衍生的 clade F 腺相关病毒(AAV)的基因组编辑平台,它不需要预先进行核酸酶介导的 DNA 断裂,而是通过 BRCA2 依赖性同源重组起作用。基因组编辑由互补同源臂指导,具有高度的准确性和无缝性,没有靶基因突变的证据,包括插入/缺失或包含 AAV 反向末端重复序列。在人类基因组的不同基因座中,包括安全港基因座 AAVS1 和治疗相关的 IL2RG 基因以及小鼠的 Rosa26 基因座中,都证明了高效的基因组编辑。HSC 衍生的 AAV 载体(AAVHSC)介导的基因组编辑在包括 CD34 细胞、成人肝脏、肝内皮细胞和肌细胞在内的原代人类细胞中非常稳健。重要的是,在小鼠中单次静脉注射 AAVHSC 编辑载体后,体内就能实现高效的基因编辑。因此,clade F AAV 介导的基因组编辑代表了一种有前途的、高效的、精确的、单一成分的方法,能够开发用于治疗多种人类基于基因的疾病的体内治疗性基因组编辑。

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