Nature Commun:PNAs基因编辑技术实现在子宫里治病

2018-07-10 小通 生物通

卡内基梅隆大学和耶鲁大学的研究人员首次利用基因编辑技术成功治愈了小鼠遗传疾病,这项发表在《Nature Communications》的研究为胎儿发育过程中出现遗传状况治疗提供了一个新途径。


卡内基梅隆大学和耶鲁大学的研究人员首次利用基因编辑技术成功治愈了小鼠遗传疾病,这项发表在《Nature Communications》的研究为胎儿发育过程中出现遗传状况治疗提供了一个新途径。

据估计,每年800万儿童患有严重的遗传疾病或出生缺陷。妊娠期间可以通过羊膜穿刺术检测胎儿是否患有遗传疾病,但是,在出生前没有医疗选择可以纠正这些遗传错误。

胚胎发育早期,许多干细胞快速分裂。“如果我们能早点纠正一个基因突变,就能显著地减少突变对婴儿发育的影响,甚至可以治愈这种疾病,”卡耐基梅隆大学医学院化学教授Danith Ly说。

研究人员采用Ly课题组研发的基于肽核酸(peptide nucleic acids,PNAs)的基因编辑技术,使用FDA批准的纳米颗粒将与供体DNA配对的PNA分子递送至遗传突变位点。当PNA-DNA复合体识别出指定突变时,PNA分子与DNA结合并解开它的两条链,让供体DNA与有缺陷的DNA结合,促使细胞DNA修复途径发挥作用,从而纠正错误。此前这种技术也曾用于治疗β地中海贫血症。

新研究中,科学家使用类似羊膜穿刺的技术,将PNA复合物注入孕鼠羊水,腹内小鼠携带β珠蛋白突变的β地中海贫血。妊娠期间,只注射一次PNA就能纠正6%的突变,这6%的错误纠正可显著改善小鼠出生后β地中海贫血疾病症状,甚至足以使小鼠被视为治愈。在子宫里接受PNA治疗的小鼠血红蛋白水平恢复正常范围,脾肿大减少,存活率增加。

研究人员还指出,治疗没有脱靶影响,暗示这种方法可能比其他基因编辑技术(如CRISPR/Cas9)更可取,因为CRISPR/Cas9有可能错误地破坏正常DNA。

“CRISPR虽然更容易操作,但脱靶效应使它对临床治疗不一定有用,”Ly说。“在治疗疾病方面,PNA技术更为理想。它不切断DNA,它只与DNA结合,修复不正常的东西。当我们使用PNA基因编辑技术时,我们检查了5000万个样本,没有发现一个异常修改错误。”

研究人员认为,在妊娠期间多次治疗,这种技术可能会取得更高的成功率。他们也希望看到它应用于其他疾病。

原始出处:

Adele S. Ricciardi, et al.In utero nanoparticle delivery for site-specific genome editing.Nature Communications 9, 2481.June 2018 

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    2018-11-21 liuli5079
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    2019-05-23 docwu2019
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    2018-07-29 liye789132251
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    2018-07-10 清风拂面

    谢谢分享学习

    0