Cell:新型血检技术或可扩大液体活检的范围

2016-01-21 佚名 生物谷

当细胞死亡后,其并不会消失地无影无踪,相反其会以游离DNA的形式留下一下“指纹”痕迹,而在人类机体中,这些小型的DNA片段就会在血液中被发现;近些年来游离DNA的研究领域应运而生了一种称之为“液体活检”的新技术,该技术可以诊断并且监测某些癌症,鉴别出胎儿机体异常,并且评估移植器官的健康性,进行这些操作仅需要简单的抽血就可以完成,尽管这些检测潜力巨大,但目前其所检测的范围却非常有限。 发表在C

当细胞死亡后,其并不会消失地无影无踪,相反其会以游离DNA的形式留下一下“指纹”痕迹,而在人类机体中,这些小型的DNA片段就会在血液中被发现;近些年来游离DNA的研究领域应运而生了一种称之为“液体活检”的新技术,该技术可以诊断并且监测某些癌症,鉴别出胎儿机体异常,并且评估移植器官的健康性,进行这些操作仅需要简单的抽血就可以完成,尽管这些检测潜力巨大,但目前其所检测的范围却非常有限。

发表在Cell上的一篇报道中,华盛顿大学的科学家就表示他们开发了一种新方法可以克服当前液体活检技术的局限性,从而就以帮助鉴别出哪些类型的细胞可以产生游离DNA;这种方法可以扩大液体活检的检测范围,其依赖于对个体机体中游离DNA的片段谱系进行分析,同时将这种谱系信息同细胞多种死亡生理条件进行对比。

研究者Shendure说道,williamhill asia 的研究表明,通过观察游离DNA的片段谱或许就可以帮助鉴别出产生游离DNA的特殊组织,而这种方法替代了直接寻找DNA特殊突变的方法;新型检测技术可以对每个DNA片段的末端进行检测,并且找到DNA的热点区域;为了“装入”细胞核,DNA就必须进行卷曲,不断折叠形成紧密的包裹形式,而该过程的关键就是名为核小体的结构,核小体是由DNA和组蛋白组成的染色质基本结构单位,其在整个基因组中以串联形式排列,就好像细绳上的珠子一样,机体中的每个细胞都会以不同方式将DNA紧密压缩,而这些差异性就给每个细胞游离DNA带上了一定的标记。

研究者假设他们可以利用这些“指纹”来追溯游离DNA的来源,而为了完成这项工作,他们首先必须知道DNA的哪些部分缠绕在核小体上的;在细胞死亡期间DNA就会被酶类切割成小片段,而研究者表示,在人类基因组中很有可能存在1300万个核心体的位置。利用癌症患者的血液样本,研究者就发现,不同的癌症类型可以在游离DNA上产生不同的核小体指纹,对于某些癌症患者而言,研究者就可以鉴别出肿瘤的解剖学来源。

大多数的液体活检技术都会寻找机体中不同细胞间的特殊DNA错配,比如存在于肿瘤细胞但不存在于健康细胞的突变等,研究者认为这种新型检测技术的优势就在于其甚至可以对遗传特性相当的两个细胞进行有效区分;目前这种新技术可以对液体活检不能诊断的一系列疾病进行检测,而研究者希望新型检测技术可帮助进行诸如心脏疾病、中风及自身免疫等疾病的诊断。

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    2016-08-27 李东泽

    这篇威廉亚洲官网 带给williamhill asia 新知识,启发新思维,不论是科研还是临床工作都有很大的帮助。。。

    0

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    2016-02-18 仁医06
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    2016-01-30 上官海棠

    好!

    0

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    2016-01-27 李继凯

    文章不错

    0

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    2016-01-27 李继凯

    厉害

    0

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    2016-01-23 smlt2008
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