Essential gene networks in acute myeloid leukemia identified using a microRNA-knockout CRISPR library screen
Gabra, M. M.; Pastrello, C.; Machado, N.; Chow, J. T.-S.; Kotlyar, M.; Tokar, T.; Jurisica, I.; Salmena, L.
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MicroRNAs (miRNA) are small RNAs that function as key modulators of gene expression. Due to their promiscuity of binding, a single miRNA may regulate several genes and hence, multiple pathways simultaneously. In addition, the 3-UTR of mRNA can be recognized by several miRNA for suppression or degradation. We built a microRNA-only Knock-out (miRKo) CRISPR/Cas-9 library to identify essential miRNA in Acute Myeloid Leukemia (AML) using OCI-AML2, OCI-AML3 and U937 cell lines as in vitro models. 10 miRNA were identified to be essential in our screen among all three cell lines: miR-19b-1, -19b-2, 29b-2, -302a, -3678, -3713, -3910-1, -4447, -4718 and -6795. By using weighted degrees of association, we identified pathway hubs that uniquely affect all 3 cell lines by integrating miRNA:mRNA networks using mirDIP and pathway analysis using pathDIP. Through the miRKo screen, network membership analyses and biological anticorrelation scoring through patient data analysis, we identified RRP2CA, RPS6KB-1, CREB1, RPM1A, MAPK10, MAP3K2, ITCH, FBX-W7, NR3C1 and XIAP as likely targets of the essential miRNA in AML; and signal transduction, apoptosis, TGF-beta signalling and MAPK signalling as candidate essential pathways in AML.
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