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A microRNA polycistron as a potential human oncogene

机译:microRNA多顺反子作为潜在的人类致癌基因

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To date, more than 200 microRNAs have been described in humans; however, the precise functions of these regulatory, noncoding RNAs remains largely obscure. One cluster of microRNAs, the mir-17-92 polycistron, is located in a region of DNA that is amplified in human B-cell lymphomas(1). Here we compared B-cell lymphoma samples and cell lines to normal tissues, and found that the levels of the primary or mature microRNAs derived from the mir-17-92 locus are often substantially increased in these cancers. Enforced expression of the mir-17-92 cluster acted with c-myc expression to accelerate tumour development in a mouse B-cell lymphoma model. Tumours derived from haematopoietic stem cells expressing a subset of the mir- 17 - 92 cluster and c-myc could be distinguished by an absence of apoptosis that was otherwise prevalent in c-myc-induced lymphomas. Together, these studies indicate that non-coding RNAs, specifically microRNAs, can modulate tumour formation, and implicate the mir- 17 - 92 cluster as a potential human oncogene.
机译:迄今为止,已在人类中描述了200多种microRNA;然而,到现在为止,已有20种microRNA被报道。但是,这些调节性非编码RNA的精确功能在很大程度上仍然不清楚。 microRNA的一个簇,即mir-17-92多顺反子,位于人类B细胞淋巴瘤中扩增的DNA区域(1)。在这里,我们将B细胞淋巴瘤样本和细胞系与正常组织进行了比较,发现在这些癌症中,源自mir-17-92基因座的初级或成熟microRNA的水平通常显着提高。 mir-17-92簇的强制表达与c-myc表达共同作用,以加速小鼠B细胞淋巴瘤模型中的肿瘤发展。源于表达mir-17-92簇和c-myc子集的造血干细胞的肿瘤可以通过不存在凋亡来区分,否则在c-myc诱导的淋巴瘤中很普遍。总之,这些研究表明非编码RNA,特别是microRNA,可以调节肿瘤形成,并暗示mir-17-92簇是潜在的人类致癌基因。

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