Validation and quantification of RNA editing activity in primary bone marrow-derived hematopoietic stem and progenitor cells transduced with lentiviral-ADAR1. CD34-selected cells from normal bone marrow (BM) samples (n = 3, average donor age = 64.3 ± 2.9 years old) were transduced with lentiviral (lenti)-ADAR1 or vector (ORF) control. After 4 days of culture, cells were lysed and processed for qRT-PCR and RESSq-PCR analysis. (A,B) Relative expression of lentivirus-derived (a) and total (b) ADAR1 levels in transduced BM samples (n = 3) showing increased human ADAR1 expression in ADAR1-transduced samples, with higher levels of total ADAR1 overexpression achieved in samples BM-410 and BM-416. (C,D) Representative Sanger sequencing analysis of high-fidelity PCR products amplified with primers flanking the APOBEC3D editing site showing increased G(I) peak in lenti-ADAR1 transduced cells that displayed robust ADAR1 expression (BM-410, C). (E,F) Quantification of sequencing peak height ratios and corresponding RESSq-PCR analysis in lenti-ORF and lenti-ADAR1 transduced BM samples.