The miR-17 microRNA precursor family are a group of related small non-coding RNA genes called microRNAs that regulate gene expression. The microRNA precursor miR-17 family, includes miR-20a/b, miR-93, and miR-106a/b. With the exception of miR-93, these microRNAs are produced from several microRNA gene clusters, which apparently arose from a series of ancient evolutionary genetic duplication events, and also include members of the miR-19, and miR-25 families.[1] These clusters are transcribed as long non-coding RNA transcripts that are processed to form ~70 nucleotide microRNA precursors, that are subsequently processed by the Dicer enzyme to give a ~22 nucleotide products. The mature microRNA products are thought to regulate expression levels of other genes through complementarity to the 3' UTR of specific target messenger RNA.[2][3]
The paralogous miRNA gene clusters that give rise to miR-17 family microRNAs (miR-17~92, miR-106a~363, and miR-106b~25) have been implicated in a wide variety of malignancies and are sometimes referred to as oncomirs.[4] The oncogenic potential of these non-protein encoding genes was first identified in mouse viral tumorigenesis screens.[5][6][7]
In humans, the activating mutations of miR-17~92 have been identified in non-Hodgkin's lymphoma, whereas the miRNA constituents of the clusters are overexpressed in a multiple cancer types.[8][9][10] High level expression of miR-17 family members induces cell proliferation, whereas deletion of the miR-17~92 cluster, in mice, is lethal and causes lung and lymphoid cell developmental defects.[11] In addition, in the nasopharyngeal carcinoma cell line, miR-20a and miR-20b has been shown to target the 3’ UTR of vascular endothelial growth factor (VEGF) and repress the expression of VEGF, which is an important angiogenic factor.[12][13] miR-20a detection in human faeces could be a non-invasive screening marker for colorectal cancer.[14]
^Yu J, Ohuchida K, Mizumoto K, Fujita H, Nakata K, Tanaka M (2010). "MicroRNA miR-17-5p is overexpressed in pancreatic cancer, associated with a poor prognosis and involved in cancer cell proliferation and invasion". Cancer Biol Ther. 10 (8): 748–757. doi:10.4161/cbt.10.8.13083. PMID20703102. S2CID12028238.
^Li H, Bian C, Liao L, Li J, Zhao RC (2010). "miR-17-5p promotes human breast cancer cell migration and invasion through suppression of HBP1". Breast Cancer Res Treat. 126 (3): 565–575. doi:10.1007/s10549-010-0954-4. PMID20505989. S2CID24272629.
^Chow TF, Mankaruos M, Scorilas A, Youssef Y, Girgis A, Mossad S, Metias S, Rofael Y, Honey RJ, Stewart R, Pace KT, Yousef GM (2010). "The miR-17-92 cluster is over expressed in and has an oncogenic effect on renal cell carcinoma". J Urol. 183 (2): 743–51. doi:10.1016/j.juro.2009.09.086. PMID20022054.
^Beveridge NJ, Tooney PA, Carroll AP, Tran N, Cairns MJ (2009). "Down-regulation of miR-17 family expression in response to retinoic acid induced neuronal differentiation". Cell Signal. 21 (12): 1837–45. doi:10.1016/j.cellsig.2009.07.019. PMID19666108.
^Shan SW, Lee DY, Deng Z, Shatseva T, Jeyapalan Z, Du WW, Zhang Y, Xuan JW, Yee SP, Siragam V, Yang BB (2009). "MicroRNA MiR-17 retards tissue growth and represses fibronectin expression". Nat Cell Biol. 11 (8): 1031–8. doi:10.1038/ncb1917. PMID19633662. S2CID5180603.
^Ebi H, Sato T, Sugito N, Hosono Y, Yatabe Y, Matsuyama Y, Yamaguchi T, Osada H, Suzuki M, Takahashi T (2009). "Counterbalance between RB inactivation and miR-17-92 overexpression in reactive oxygen species and DNA damage induction in lung cancers". Oncogene. 28 (38): 3371–9. doi:10.1038/onc.2009.201. PMID19597473. S2CID1939787.
^Petrocca F, Vecchione A, Croce CM (2008). "Emerging role of miR-106b-25/miR-17-92 clusters in the control of transforming growth factor beta signaling". Cancer Res. 68 (20): 8191–4. doi:10.1158/0008-5472.CAN-08-1768. PMID18922889.
^Xu X, Hong Y, Kong C, Xu L, Tan J, Liang Q, Huang B, Lu J (2008). "Protein tyrosine phosphatase receptor-type O (PTPRO) is co-regulated by E2F1 and miR-17-92". FEBS Lett. 582 (19): 2850–6. doi:10.1016/j.febslet.2008.07.017. PMID18644370. S2CID5288582.
^Xu W, Li JY, Shen QD, Li L, Yu H (2007). "[DNA sequencing of miR-17-92 cluster at chromosome 13q31-q32 in mantel cell lymphoma cell lines]". Zhongguo Shi Yan Xue Ye Xue Za Zhi. 15 (5): 986–8. PMID17956675.
^Boggs RM, Moody JA, Long CR, Tsai KL, Murphy KE (2007). "Identification, amplification and characterization of miR-17-92 from canine tissue". Gene. 404 (1–2): 25–30. doi:10.1016/j.gene.2007.08.015. PMID17904311.
^Sawera M, Gorodkin J, Cirera S, Fredholm M (2005). "Mapping and expression studies of the mir17-92 cluster on pig chromosome 11". Mamm Genome. 16 (8): 594–8. doi:10.1007/s00335-005-0013-3. PMID16180141. S2CID11081775.
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