The present application provides methods of enhancing T cell function (e.g., expansion, persistence and/or effector functions), particularly by genetic modification of the Regnase-1, Batf, and additional genes (alone or in combination). The application also provides modified T cells manufactured using the methods provided by this invention and related pharmaceutical compositions. The application further provides methods of using the modified T cells for treating a disease (e.g., a cancer or an infectious disease).