In molecular biology mir-605 microRNA is a short RNA molecule. MicroRNAs function to regulate the expression levels of other genes by several mechanisms.
p53 protein network
miR-605 is transcriptionally activated by the p53 protein through interaction with the promoter region of its gene. This microRNA in turn post-transcriptionally represses the oncoprotein and p53 suppressor Mdm2, which acts with p53 in a negative feedback loop in p53-wildtype cancers. Introduction of miR-605 interrupts this p53:Mdm2 interaction and instead there is a positive feedback loop in place, enabling rapid p53 accumulation in response to stress. Such p53 accumulation induces cell cycle arrest and apoptosis.[1]
Zhang, M. W.; Yu, Y. X.; Jin, M. J.; Pan, Y. F.; Jiang, X.; Li, Q. L.; Ma, X. Y.; Zhang, S. C.; Chen, K. (2011). "Association of miR-605 and miR-149 genetic polymorphisms with related risk factors of lung cancer susceptibility". Zhejiang da Xue Xue Bao. Yi Xue Ban = Journal of Zhejiang University. Medical Sciences. 40 (3): 265–271. doi:10.3785/j.issn.1008-9292.2011.03.006. PMID21671485.