在治疗应用中,CRISPR-Cas9通过完全代码序列替换对RAG2位点进行工程
Daniel Allen1, Orli Knop1, Bryan Itkowitz1
1Institute of Nanotechnology and Advanced Materials, The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel.
Nature communications
|October 27, 2023
概括
基因编辑为RAG2-SCID提供了一个有前途的治疗方法,RAG2-SCID是一种严重的免疫缺陷. 这项研究开发了一种新的策略来纠正干细胞中的重组激活基因2 (RAG2),恢复T细胞发育.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 基因治疗 基因治疗
背景情况:
- RAG2-SCID是一种由重组激活基因2 (RAG2) 突变引起的初级免疫缺陷.
- 目前的治疗包括全源造血干细胞移植 (HSCT),这有局限性.
- 患者造血干细胞和原生细胞 (HSPC) 的活体基因编辑是一种潜在的替代疗法.
研究的目的:
- 为RAG2-SCID开发一种创新的RAG2基因校正策略.
- 通过更换整个编码序列来保存内源基因调节和位点架构.
- 证明这种策略在恢复T细胞发育和谱系多样性的有效性.
主要方法:
- 利用CRISPR-Cas9/rAAV6基因编辑来进行HSPCs的活体操纵.
- 实施了一项战略,用更正的转基因替换内源RAG2编码序列 (CDS).
- 在体外平台上评估T细胞发育 (CD3+TCRαβ+,CD3+TCRγδ+) 和T细胞受体 (TRB,TRG) 谱系多样性.
主要成果:
- 成功表达了更正RAG2转基因.
- 经过基因校正的细胞发展成为功能性的CD3+TCRαβ+和CD3+TCRγδ+T细胞.
- 建立了高度多样化的TRB和TRG谱,表明恢复了淋巴细胞成熟.
结论:
- 这项概念验证研究证明了RAG2-SCID的可行基因治疗方法.
- 取代RAG2 CDS的策略有望为更安全的基因疗法提供希望,该疗法针对的是严格调节的基因.
- 这种方法可以为RAG2-SCID患者提供HSCT更安全的替代方案.
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