Identification of an RNA editing fingerprint of malignant progenitor reprogramming, and stable ADAR1 overexpression in K562 cells. (A) LSC purification strategy for detection of CSC-associated RNA recoding. (B-D) RNA-sequencing analysis of FACS-purified CP and BC CML LSC  showing A-to-G RNA editing changes in MDM2, AZIN1 and APOBEC3D (n = 8 per group). (E) Lentiviral construct expressing human ADAR1 or a catalytically inactive form (ADAR1m). (F-H) qRT-PCR analysis of cDNA prepared from K562 lines using primers detecting ADAR1 lentivirus (F) and total human ADAR1 (G,H) showing K562 leukemia cells stably transduced with active ADAR1 or inactive ADAR1m express high levels of ADAR1 transcripts compared with vector open reading frame (ORF) control backbone. *p < 0.05 by unpaired, two-tailed Student’s t-test.