PLoS Genet:惠静毅等发现肺癌细胞中异常剪接的关键调控因子

2014-05-06 SIBS SIBS

4月10日,国际学术期刊PLOS Genetics 在线发表了中国科学院上海生命科学研究院生物化学与细胞生物学研究所惠静毅课题组题为The RNA-binding protein QKI suppresses cancer-associated aberrant splicing 的研究论文。该研究发现RNA结合蛋白QKI是产生肺癌相关剪接事件的一个重要调控因子,并揭示了一种由QKI蛋白介导的抑制

4月10日,国际学术期刊PLOS Genetics 在线发表了中国科学院上海生命科学研究院生物化学与细胞生物学研究所惠静毅课题组题为The RNA-binding protein QKI suppresses cancer-associated aberrant splicing 的研究论文。该研究发现RNA结合蛋白QKI是产生肺癌相关剪接事件的一个重要调控因子,并揭示了一种由QKI蛋白介导的抑制肿瘤细胞增殖的新机制。

Pre-mRNA可变剪接是一种增加基因组多样性和调控基因表达的重要机制。在肿瘤的发生发展过程中,许多剪接事件发生异常变化。然而,我们并不清楚这些异常剪接事件是如何产生的,异常剪接产物对肿瘤细胞的生物学功能产生什么影响。肺癌是最常见的恶性肿瘤之一,在全球范围是癌症相关致死的头号杀手。由于缺乏有效的早期诊断手段和治疗方案,大多数患者的5年生存率仍然较低。因此,需要更全面地认识肺癌发生的分子机制,以期发现可靠的早期标志物和有效的治疗靶标。

在该项研究中,博士研究生宗峰阳、傅兴博士以及其他同事通过多种实验与生物信息学的手段,发现RNA结合蛋白QKI在非小细胞肺癌(NSCLC)中通常表达下调,它的下调与早期患者的生存期缩短显著相关。QKI蛋白能够在体外和体内抑制肺癌细胞的增殖和转化能力。通过RNA-Seq分析,QKI被确定为肺癌细胞中的一种关键的可变剪接调控因子。QKI可通过调控其关键靶点NUMB基因的剪接,抑制肺癌细胞增殖,并阻止Notch信号通路的异常激活。此外,通过对QKI蛋白调控剪接的分子机制研究,还发现它可以有选择性地与剪接核心因子SF1进行竞争,抑制可变外显子的引入。

该研究工作在肺癌细胞中发现QKI是一种新的关键剪接调控因子和一种潜在的早期肺癌预后标记,并首次提出由QKI/NUMB/Notch通路调控肿瘤增殖的新机制。

该项工作得到了合作课题组季红斌研究员以及复旦大学卢大儒教授的大力支持,得到中科院、国家科技部、国家自然科学基金委等经费支持。

原始出处

Zong FY1, Fu X2, Wei WJ1, Luo YG1, Heiner M1, Cao LJ1, Fang Z3, Fang R3, Lu D4, Ji H3, Hui J1.The RNA-Binding Protein QKI Suppresses Cancer-Associated Aberrant Splicing.PLoS Genet. 2014 Apr 10

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    2015-04-17 canlab
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    2014-09-16 cy0324
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    2014-05-08 yxch36