Abstract
Monocytes play important and diverse roles in both homeostatic and inflammatory immune responses. The CRISPR-Cas9 system in lentiviral vectors has been widely used to manipulate specific genes of immortal monocyte cell lines to study monocyte functions. However, human primary monocytes are refractory to this method with low gene knockout (KO) efficiency. In this chapter, we developed an in vitro gene-editing procedure for primary human monocytes with a consistent and high-gene KO efficiency via a ribonucleoprotein (RNP) complex consisting of Cas9 protein and single-guide RNA (sgRNA). This method can be adapted to study the functions of targeted signaling molecules involved in modulating monocyte polarization in primary human monocytes.
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