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AAV-CRISPR Gene Editing Is Negated by Pre-existing Immunity to Cas9.
文献信息
| DOI | 10.1016/j.ymthe.2020.04.017 |
|---|---|
| PMID | 32348718 |
| 期刊 | Molecular therapy : the journal of the American Society of Gene Therapy |
| 影响因子 | 12.0 |
| JCR 分区 | Q1 |
| 发表年份 | 2020 |
| 被引次数 | 117 |
| 关键词 | AAV-CRISPR, CD8+ T细胞, SaCas9, 腺病毒相关病毒, 基因治疗 |
| 文献类型 | Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S. |
| ISSN | 1525-0016 |
| 页码 | 1432-1441 |
| 期号 | 28(6) |
| 作者 | Ang Li, Mark R Tanner, Ciaran M Lee, Ayrea E Hurley, Marco De Giorgi, Kelsey E Jarrett, Timothy H Davis, Alexandria M Doerfler, Gang Bao, Christine Beeton, William R Lagor |
一句话小结
本研究探讨了腺病毒相关病毒(AAV)载体在小鼠模型中递送CRISPR-Cas9进行肝脏基因组编辑的有效性,发现尽管能够实现有效编辑,但因先天免疫反应导致CD8+ T细胞增加,进而引发肝细胞凋亡和基因组编辑细胞的消失。该结果对基于CRISPR-Cas9的体内基因组编辑的安全性和有效性提出了重要警示,提示需关注免疫反应对治疗效果的影响。
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AAV-CRISPR · CD8+ T细胞 · SaCas9 · 腺病毒相关病毒 · 基因治疗
摘要
腺病毒相关病毒(AAV)载体是将CRISPR-Cas9用于体内治疗基因组编辑的主要候选者。然而,基于AAV的递送涉及Cas9核酸酶的持续表达,这是一种细菌蛋白。最近的研究表明,在人类中,对常用的来自化脓性链球菌(SpCas9)和金黄色葡萄球菌(SaCas9)的Cas9同源物存在高频率的中和抗体和特异性T细胞。我们在小鼠模型中测试了对SaCas9的先天免疫是否会对使用AAV包装CRISPR-Cas9进行肝脏基因组编辑构成障碍。尽管在具有先天SaCas9免疫的小鼠肝脏中实现了有效的基因组编辑,但这伴随着肝脏中CD8+ T细胞比例的增加。这种细胞毒性T细胞响应的特征表现为肝细胞凋亡、重组AAV基因组的丧失以及基因组编辑细胞的完全消除,随后是肝脏的补偿性再生。我们的研究结果对基于CRISPR-Cas9的体内肝脏基因组编辑的有效性和安全性提出了重要的关注。
英文摘要
Adeno-associated viral (AAV) vectors are a leading candidate for the delivery of CRISPR-Cas9 for therapeutic genome editing in vivo. However, AAV-based delivery involves persistent expression of the Cas9 nuclease, a bacterial protein. Recent studies indicate a high prevalence of neutralizing antibodies and T cells specific to the commonly used Cas9 orthologs from Streptococcus pyogenes (SpCas9) and Staphylococcus aureus (SaCas9) in humans. We tested in a mouse model whether pre-existing immunity to SaCas9 would pose a barrier to liver genome editing with AAV packaging CRISPR-Cas9. Although efficient genome editing occurred in mouse liver with pre-existing SaCas9 immunity, this was accompanied by an increased proportion of CD8+ T cells in the liver. This cytotoxic T cell response was characterized by hepatocyte apoptosis, loss of recombinant AAV genomes, and complete elimination of genome-edited cells, and was followed by compensatory liver regeneration. Our results raise important efficacy and safety concerns for CRISPR-Cas9-based in vivo genome editing in the liver.
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主要研究问题
- 在AAV-CRISPR基因编辑中,如何评估和管理预先存在的对Cas9的免疫反应?
- 其他类型的基因编辑工具是否也会受到类似的免疫反应影响?如果有,具体情况如何?
- 在临床应用中,如何选择适合的Cas9正交体以降低免疫反应的风险?
- 对于AAV载体的使用,有哪些策略可以提高其在有预先免疫反应的患者中的有效性?
- 预先存在的免疫反应对AAV-CRISPR基因编辑的长期效果和安全性有何影响?
核心洞察
研究背景和目的
AAV(腺相关病毒)载体是将CRISPR-Cas9用于体内基因编辑的主要候选者。然而,研究表明,许多人对常用的Cas9正交体(如Streptococcus pyogenes的SpCas9和Staphylococcus aureus的SaCas9)存在预先免疫反应。本研究旨在探讨预先存在的SaCas9免疫是否会影响AAV包装的CRISPR-Cas9在小鼠肝脏中的基因编辑效果。
主要方法/材料/实验设计
本研究使用小鼠模型,设计了一个经典的延迟型超敏反应(DTH)实验以建立对SaCas9的免疫记忆。小鼠分为两组,分别接种SaCas9或卵白蛋白(Ova),一周后挑战接种相应抗原,并测量耳部肿胀。接着,两组小鼠接受了AAV-CRISPR(针对低密度脂蛋白受体基因Ldlr)和GFP的共同注射,随后在不同时间点收集肝脏样本进行流式细胞术分析。
关键结果和发现
- 免疫记忆建立:小鼠在接种SaCas9后,能快速产生强烈的记忆T细胞反应,表现为耳部肿胀和组织学变化。
- 细胞毒性反应:接种SaCas9的小鼠在AAV-CRISPR注射后,肝脏中CD8+ T细胞比例显著增加,导致基因编辑肝细胞的凋亡和肝脏再生。
- 基因编辑效果下降:尽管AAV-CRISPR在接种SaCas9的小鼠中最初能够有效进行基因编辑,但在12周后,经过CD8+ T细胞的清除作用,基因编辑的肝细胞几乎完全消失。
主要结论/意义/创新性
本研究表明,预先存在的对SaCas9的免疫反应对AAV-CRISPR在肝脏中的基因编辑产生显著影响。CD8+ T细胞的活化导致了基因编辑细胞的消失,这对基因编辑疗法的有效性和安全性提出了重要的警示。研究强调了在临床试验设计中考虑抗Cas9免疫反应的重要性,并指出需要开发新的基因编辑传递方法。
研究局限性和未来方向
- 研究局限性:本研究主要在小鼠模型中进行,实际人类的免疫反应可能更为复杂且具有个体差异。
- 未来方向:建议探索使用其他细菌CRISPR-Cas系统,以避免对Cas9的预先免疫反应。此外,开发自我去除的AAV-CRISPR系统或转瞬递送的Cas9 mRNA/蛋白质的方法可能是未来的研究重点。
| 部分 | 内容 |
|---|---|
| 研究背景 | AAV载体在CRISPR-Cas9基因编辑中的应用受到预先免疫反应的影响。 |
| 主要方法 | 通过小鼠模型建立免疫记忆,使用流式细胞术分析免疫反应。 |
| 关键发现 | 预先免疫导致CD8+ T细胞增加,基因编辑肝细胞凋亡。 |
| 结论 | 预先免疫反应对AAV-CRISPR基因编辑的有效性构成威胁。 |
| 未来方向 | 探索新型CRISPR系统和改进的递送方法。 |
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引用本文的文献
- Immunity to Cas9 as an Obstacle to Persistent Genome Editing. - Veronica Gough;Charles A Gersbach - Molecular therapy : the journal of the American Society of Gene Therapy (2020)
- Ready for Repair? Gene Editing Enters the Clinic for the Treatment of Human Disease. - Martijn P T Ernst;Mike Broeders;Pablo Herrero-Hernandez;Esmee Oussoren;Ans T van der Ploeg;W W M Pim Pijnappel - Molecular therapy. Methods & clinical development (2020)
- New Directions in Pulmonary Gene Therapy. - Amber Vu;Paul B McCray - Human gene therapy (2020)
- Translating CRISPR-Cas Therapeutics: Approaches and Challenges. - Lavina Sierra Tay;Nathan Palmer;Rebecca Panwala;Wei Leong Chew;Prashant Mali - The CRISPR journal (2020)
- Delivery Approaches for Therapeutic Genome Editing and Challenges. - Ilayda Ates;Tanner Rathbone;Callie Stuart;P Hudson Bridges;Renee N Cottle - Genes (2020)
- Tools for experimental and computational analyses of off-target editing by programmable nucleases. - X Robert Bao;Yidan Pan;Ciaran M Lee;Timothy H Davis;Gang Bao - Nature protocols (2021)
- Design of efficacious somatic cell genome editing strategies for recessive and polygenic diseases. - Jared Carlson-Stevermer;Amritava Das;Amr A Abdeen;David Fiflis;Benjamin I Grindel;Shivani Saxena;Tugce Akcan;Tausif Alam;Heidi Kletzien;Lucille Kohlenberg;Madelyn Goedland;Micah J Dombroe;Krishanu Saha - Nature communications (2020)
- CRISPR/Cas9 gene editing for curing sickle cell disease. - So Hyun Park;Gang Bao - Transfusion and apheresis science : official journal of the World Apheresis Association : official journal of the European Society for Haemapheresis (2021)
- CRISPR-Cas9 gene editing of hepatitis B virus in chronically infected humanized mice. - Daniel Stone;Kelly R Long;Michelle A Loprieno;Harshana S De Silva Feelixge;Elizabeth J Kenkel;R Matt Liley;Stephen Rapp;Pavitra Roychoudhury;Thuy Nguyen;Laurence Stensland;Rossana Colón-Thillet;Lindsay M Klouser;Nicholas D Weber;Connie Le;Jessica Wagoner;Erin A Goecker;Alvason Zhenhua Li;Karsten Eichholz;Lawrence Corey;D Lorne Tyrrell;Alexander L Greninger;Meei-Li Huang;Stephen J Polyak;Martine Aubert;John E Sagartz;Keith R Jerome - Molecular therapy. Methods & clinical development (2021)
- Cas9-directed immune tolerance in humans-a model to evaluate regulatory T cells in gene therapy? - Dimitrios Laurin Wagner;Lena Peter;Michael Schmueck-Henneresse - Gene therapy (2021)
... (107 更多 篇文献)
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