Total RNA from RPMI-8226 and KMS12-BM cell lines knocked-down with a scrambled shRNA (control sh) or
DIS3 shRNA (DIS3 sh) was collected 72 h after infection and extracted with TRIzol
® RNA Isolation Reagent. Quality assessment was performed using a
Bioanalyzer Agilent 2100 (Agilent, Santa Clara, CA, USA). Total RNA samples were processed using the FlashTag labeling kit and then hybridized to the GeneChip
® miRNA arrays v1.0 (Affymetrix Inc., Santa Clara, CA, USA), according to the Affymetrix recommended protocol. Expression values for 847 human miRNAs were extracted from CEL files using Affymetrix
miRNA QC tool software (RMA normalized and log
2-transformed (31 (
link))). Data were analyzed using the software dCHIP (
http://biosun1.harvard.edu/complab/dchip). The microarray data have been deposited in the Gene Expression Omnibus (GEO) under accession number GSE55246 (available at
http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?token=orydwgscvrmpbaz&acc=GSE55246). Gene set enrichment analysis (GSEA) was performed as previously described (GSEA v2.0 at
http://www.broad.mit.edu/gsea, (32 (
link))) using gene set as permutation type and 1000 permutations and signal to noise as metric for ranking genes. miRNA families were derived from miRBase (
http://www.mirbase.org). In line with GSEA default settings, only miRNA families including at least five members were included in the analysis.
Segalla S., Pivetti S., Todoerti K., Chudzik M.A., Giuliani E.C., Lazzaro F., Volta V., Lazarevic D., Musco G., Muzi-Falconi M., Neri A., Biffo S, & Tonon G. (2015). The ribonuclease DIS3 promotes let-7 miRNA maturation by degrading the pluripotency factor LIN28B mRNA. Nucleic Acids Research, 43(10), 5182-5193.