Nature Biomedical Engineering: 用魔法打败魔法?利用RNA干扰降低CRISPR在肝脏中的脱靶性

2022-04-18 nagashi “生物世界”公众号

通过脂质纳米颗粒(LNP)将两种寡核苷酸(干扰sgRNA二级结构的寡核苷酸、靶向Cas9-mRNA的siRNA)递送到肝脏,破坏肝脏细胞中的脱靶编辑。

使用脂质纳米颗粒(LNP)递送的mRNA疫苗在抗击COIVD-19大流行中获得巨大成功,同时也突出了mRNA技术的医疗和社会效益。不仅如此,mRNA还可以用来诱导细胞产生外源蛋白,用于免疫治疗和基因编辑等等。

在基因编辑中,确保病变细胞中特定的目标编辑和避免改变其他非目标细胞的基因组是至关重要的。值得注意的是,通过静脉注射输送的LNP有很大一部分(30-90%)会富集在肝脏中,这阻碍了非病毒载体在肝脏以外的组织中进行编辑基因等治疗手段的发展。

近日,美国佐治亚理工学院的研究人员在 Nature Biomedical Engineering 期刊发表题为:Augmented lipid-nanoparticle-mediated in vivo genome editing in the lungs and spleen by disrupting Cas9 activity in the liver 的研究论文。

该研究表明,通过脂质纳米颗粒(LNP)将两种寡核苷酸(干扰sgRNA二级结构的寡核苷酸、靶向Cas9-mRNA的siRNA)递送到肝脏,破坏肝脏细胞中的脱靶编辑,从而提高了肝外组织和器官中CRISPR-Cas基因组编辑的特异性

该研究的通讯作者 James Dahlman 教授及其团队首先开发出了抑制性的抗CRISPR寡核苷酸,并在小鼠主动脉内皮细胞插入突变模型中证实,该抗CRISPR寡核苷酸可以与sgRNA相互作用,减少Cas9介导的基因组编辑活性。

进一步的研究阐明了抗CRISPR寡核苷酸的作用机制:抗CRISPR寡核苷酸破坏了sgRNA的二级结构,阻止了sgRNA与Cas9的结合,从而减少了脱靶编辑。

抗CRISPR寡核苷酸破坏了sgRNA的二级结构,减少了脱靶编辑

为了研究抗CRISPR寡核苷酸是否可以用来减少肝脏中的脱靶编辑,研究团队首先给稳定表达Cas9-GFP融合蛋白的小鼠递送两种不同的LNP,一种LNP携带抗CRISPR寡核苷酸,另一种则携带无序寡核苷酸。两小时后,他们用同样的LNP处理了同样的小鼠,但却封装了靶向GFP基因位点的sgRNA。

研究团队发现,与无序寡核苷酸相比,抗CRISPR寡核苷酸将肝脏中因脱靶编辑导致的插入突变频率降低了两倍以上。

通讯作者 James Dahlman 教授表示:“在向小鼠注射LNP的前两个小时,含靶向GFP-sgRNA的抗CRISPR寡核苷酸的LNP降低了肝脏细胞的插入突变的频率,但在肺部细胞和无序寡核苷酸LNP中则没有这种效果。”

siRNA降解Cas9-mRNA,破坏Cas9的生成,从而降低脱靶编辑

为了进一步减少脱靶基因组编辑,研究团队设计了包含5个小干扰RNA(siRNA)结合位点(在3'非翻译区域)的Cas9-mRNA,并在永生化小鼠主动脉内皮细胞模型和小鼠模型中证实,siRNA与Cas9-mRNA的结合激活了内源性RNA干扰的细胞过程,导致mRNA降解,从而有效减少肝细胞因CRISPR基因编辑而引起的插入突变。

更重要的是,研究团队还发现,当他们将抗CRISPR寡核苷酸和siRNA联合使用后,可以进一步减少肝脏细胞中发生脱靶基因编辑。不仅如此,研究人员用另一种递送系统(GalNAc)和肺部炎症小鼠模型复制了这些发现。

通过LNP或GalNAc偶联物递送抗CRISPR寡核苷酸和siRNA,减少肝细胞中的脱靶编辑

总的来说,这项研究证实,可以通过抗CRISPR寡核苷酸和siRNA来减少LNP递送的CRISPR基因编辑系统在肝脏细胞中导致的脱靶编辑。在当下,大多数基因组编辑技术需要多个组件。

因此,对LNP的设计进行优化,以顺序或同时传递每种成分,对治疗性体内基因组编辑在人类中的安全应用至关重要。除了基因组编辑,核酸递送还可以用来治疗癌症和其他疾病,此外,LNP通过活性或内源性靶向优先进入特定的器官和细胞类型,并可以提供多种核酸,这可能有助于基因编辑在新疾病环境中的应用。

原始出处:

Sago, C.D., Lokugamage, M.P., Loughrey, D. et al. Augmented lipid-nanoparticle-mediated in vivo genome editing in the lungs and spleen by disrupting Cas9 activity in the liver. Nat Biomed Eng 6, 157–167 (2022). https://doi.org/10.1038/s41551-022-00847-9.

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    2022-04-22 spoonycyy
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GetPortalCommentsPageByObjectIdResponse(id=1533603, encodeId=22dc153360323, content=<a href='/topic/show?id=7583114e529' target=_blank style='color:#2F92EE;'>#Medical#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11475, encryptionId=7583114e529, topicName=Medical)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbe912466517, createdName=海豹, createdTime=Sun Apr 17 10:38:53 CST 2022, time=2022-04-17, status=1, ipAttribution=)]
  4. [GetPortalCommentsPageByObjectIdResponse(id=2081630, encodeId=6421208163091, content=<a href='/topic/show?id=57406e8506' target=_blank style='color:#2F92EE;'>#Eng#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6785, encryptionId=57406e8506, topicName=Eng)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=3516494, createdName=spoonycyy, createdTime=Fri Apr 22 13:38:53 CST 2022, time=2022-04-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1785368, encodeId=233a1e85368aa, content=<a href='/topic/show?id=0a9c6e87ef' target=_blank style='color:#2F92EE;'>#Engin#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6787, encryptionId=0a9c6e87ef, topicName=Engin)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=3fc52500170, 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  5. 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GetPortalCommentsPageByObjectIdResponse(id=1533603, encodeId=22dc153360323, content=<a href='/topic/show?id=7583114e529' target=_blank style='color:#2F92EE;'>#Medical#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11475, encryptionId=7583114e529, topicName=Medical)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbe912466517, createdName=海豹, createdTime=Sun Apr 17 10:38:53 CST 2022, time=2022-04-17, status=1, ipAttribution=)]
    2023-03-28 liye789132251
  6. 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GetPortalCommentsPageByObjectIdResponse(id=1533603, encodeId=22dc153360323, content=<a href='/topic/show?id=7583114e529' target=_blank style='color:#2F92EE;'>#Medical#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11475, encryptionId=7583114e529, topicName=Medical)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbe912466517, createdName=海豹, createdTime=Sun Apr 17 10:38:53 CST 2022, time=2022-04-17, status=1, ipAttribution=)]
    2023-03-21 jeanqiuqiu
  7. 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    2022-06-22 sunylz
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    2022-04-18 ms4000000151253879

    厉害

    0

  9. 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    2022-04-17 docwu2019
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    2022-04-17 海豹

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Cell rep:华农韩文元团队鉴定新型CRISPR信号分子降解酶

CRISPR-Cas系统是原核生物用来抵御外来遗传元件入侵的获得性免疫系统。该研究发现了降解cOA的新型核酸酶。该酶可能参与调控III型系统的免疫活性,避免持续的免疫响应对细胞造成损害。

Nature:这种曾被美国作为生物武器的致命病毒,仍在不断爆发,CRISPR技术成功找到解药

委内瑞拉马脑炎病毒(VEEV),是一种由蚊子传播的病毒,能够感染所有马科动物,包括马、驴、斑马等等。感染后的马科动物可能突然死亡或出现进行性中枢神经系统疾病。

张锋新论文:通过CRISPR激活筛选,发现癌症免疫治疗耐药性关键蛋白

研究结果表明,BCL-2和B3GNT2是癌细胞对细胞毒性T细胞产生耐药性的关键驱动因子。

Science:CRISPR基因沉默机制开拓慢性疼痛新疗法

CRISPR基因疗法可成为治疗慢性疼痛的阿片类药物的替代品。

CRISPR斩获诺贝尔化学奖!盘点CRISPR大神和他们的基因编辑企业

2020年10月7日,诺贝尔化学奖揭晓。法国生物化学家Emmanuelle Charpentier(埃马纽埃尔·卡彭蒂耶)、美国生物学家Jennifer Doudna(詹妮弗&middo

FDA发布人类基因编辑疗法指导文件,至少临床随访15年,以监测潜在风险

自2012年CRISPR基因编辑技术诞生以来,短短十年时间,CRISPR基因编辑技术得到了快速发展和广泛应用。多项CRISPR基因编辑疗法走进临床试验,并展现了良好的治疗效果。