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SCI REP:人们为什么得脑肿瘤?或许是由于大脑中缺乏基因“编辑”

2017-06-30 佚名 肿瘤瞭望

脑肿瘤是一种致命性的恶性疾病,科学家们一直在寻求能够解释脑肿瘤来源的机制,并希望找到能够预防脑肿瘤的药物。


脑肿瘤是一种致命性的恶性疾病,科学家们一直在寻求能够解释脑肿瘤来源的机制,并希望找到能够预防脑肿瘤的药物。

近期,“自然科学报告”杂志报道了一项比较新颖而有趣的研究。该研究通过深入探讨脑组织内基因表达的机制后发现,脑肿瘤患者的组织样本缺乏microRNA的编辑。这意味着将来有一天,我们能够找到一种使用基因编辑来减缓疾病进展的方法。

MicroRNA是一种无法编码蛋白质的短链RNA,对于调节基因的表达至关重要。事实上,这些分子可能负责微调30%哺乳动物蛋白质编码基因的表达。

这种通过RNA分子的各种变化发生微调的过程即被称为“编辑”。研究表明,编辑能够“改变基因组编码的信息,增加基因调控网络的复杂性”。

一种常见的microRNA编辑类型是一种成分(腺苷)转变为另一种,如肌苷,被称之为“A到I的编辑”。

研究人员表明,A到I的编辑是生物体正常运作所需的关键过程,尤其是在细胞发育和机体平衡方面。导致基因表达变化的microRNA编辑问题与几种类型的肿瘤息息相关,包括一种被称为胶质瘤的脑肿瘤。

科学家已经研究了人类脑组织样本中microRNA编辑机制,尤其是位于前额叶皮质和体部的肿瘤以及一种名为多形性成胶质细胞瘤(多形性胶质母细胞瘤)的高度侵袭性脑肿瘤。研究小组发现,脑肿瘤样本中A-I的编辑水平显着降低,而在健康的大脑组织中,即使与人体其他类型的组织相比,这一过程也更为规律。

来自印度CSIR基因组和综合生物学研究所的首席研究员Arijit Mukhopadhyay教授称:“虽然我们还没有完全弄清其中的机制,但是在肿瘤患者中,我们观察到随着这些编辑事件水平和位置的改变,细胞发生了明显的改变。”换句话说,如果microRNA编辑失去了控制,将导致各种遗传变化,从而影响脑细胞生长,甚至发生恶性改变。

该研究小组报道称:“我们已经表明,无论是在健康还是疾病状态下,microRNA编辑过程都携带着特定序列和结构的重要信息,特别是在人类大脑组织中。”他们目前还需要开展更多研究以进一步确定大脑组织中基因水平的改变以及导致肿瘤发生的异常编辑模式。反之,他们也希望通过明确特定的能够抑制肿瘤形成的microRNA类型来预防脑肿瘤的发生。

在此基础上,研究人员将来甚至可以使用像CRISPR这样的基因编辑技术来潜在修复microRNA编辑问题,从而预防肿瘤的形成和发展。

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    2017-07-01 ylzr123

    感谢小编为我们准备了如此丰盛的精神大餐,同时也向作者致谢!认真学习了,点赞!

    0

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    2017-07-01 meiliwuxian

    学习一下

    0

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    2017-06-30 luominglian113

    学习了,谢谢分享

    0

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    2017-06-30 135****7952平儿

    学了。。。。。。。。。。

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    2017-06-30 ylzr123

    认真学习,把间接经验应用到临床实践中去,然后再总结出新思路。给点赞啦

    0

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