A functional screen of RNA binding proteins identifies genes that promote or limit the accumulation of CD138+ plasma cells
Turner DJ., Saveliev A., Salerno F., Matheson LS., Screen M., Lawson H., Wotherspoon D., Kranc KR., Turner M.
To identify roles of RNA binding proteins (RBPs) in the differentiation or survival of antibody secreting plasma cells we performed a CRISPR/Cas9 knockout screen of 1213 mouse RBPs for their ability to affect proliferation and/or survival, and the abundance of differentiated CD138+ cells in vitro. We validated the binding partners CSDE1 and STRAP as well as the m6A binding protein YTHDF2 as promoting the accumulation of CD138+ cells in vitro. We validated the EIF3 subunits EIF3K and EIF3L and components of the CCR4-NOT complex as inhibitors of CD138+ cell accumulation in vitro. In chimeric mouse models YTHDF2-deficient plasma cells failed to accumulate.