Alternative strategy to induce CRISPR-mediated genetic changes in hematopoietic cells

Acute Myeloid Leukaemia is a complex heterogenous disease caused by clonal expansion of undifferentiated myeloid precursors. Recently, several haematological models have been developed with CRISPR/Cas9, using viral vectors, because blood cells are hard to transfect. To avoid virus disadvantages, we have developed a strategy to generate CRISPR constructs, by means of PCR, which any lab equipped with basic technology can implement. These PCR-generated constructs enter easily into hard-to-transfect cells. After testing its functionality by editing MYBL2 gene in HEK293 cells, we successfully introduced the R172 mutation in IDH2 gene in NB4 cells that expresses constitutively the Cas9 nuclease. Comparing our methodology with ribonucleoprotein strategies, we found that mutation introduction efficiency was similar between both methodologies, and no off-target events were detected. Our strategy represents a valid alternative to introduce desired mutations in hard to transfect leukemic cells, avoiding using huge vectors or viral transduction.