Increased MicroRNA Activity in Human Cancers

被引:32
作者
Israel, Ariel
Sharan, Roded
Ruppin, Eytan
Galun, Eithan
机构
[1] Goldyne Savad Gene Therapy Institute, Hadassah Hebrew University Hospital, Jerusalem
[2] School of Computer Science, Tel Aviv University, Tel Aviv
[3] School of Medicine, Tel Aviv University, Tel Aviv
关键词
D O I
10.1371/journal.pone.0006045
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
MicroRNAs (miRNAs) are small regulatory RNAs that act by blocking the translation and increasing the degradation of target transcripts. MiRNAs play a critical role in many biological processes including development and differentiation and many studies have shown that major changes in miRNA levels occur in cancer. Since miRNAs degrade target messages, we used this property to develop a novel computational method aimed at determining the actual biological activity of miRNAs using variations in gene expression. Using the method described here, we quantified miRNA activity in papillary thyroid carcinoma and breast cancer, and found a strong and distinctive signal of increased global miRNA activity, embedded in the pertaining gene expression measurements. Interestingly, we found that in these two cancers, miRNA activity is globally increased, and is associated with a global downregulation of miRNA target genes. This downreguation of miRNA regulated genes is particularly noticeable for genes carrying multiple target sites for miRNAs. Among the miRNA-repressed genes, we found a significant enrichment of known tumor suppressors, thereby suggesting that the increased miRNA activity was indeed tumorigenic.
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页数:9
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