BATF drives expression of PD-1 but is dispensable for FR4 and NRP1 upregulation during tolerance induction. (A and B) Naïve KRN T cells were modified by CRISPR-Cas9 in the presence or absence of Batf gRNA (as indicated) and then subjected to tolerization for 7 days by adoptive transfer into B6.I-Ab/g7 hosts. Shown are the day 7 FR4 × PD-1 (A) and NRP1 × PD-1 (B) flow cytometry profiles for tolerized KRN T cells. Normal host polyclonal CD44hi CD4+ T cells are also displayed for reference. Mice as in Fig. 3 D. (C and D) KRN T cells were modified by CRISPR-Cas9 in the presence of Thy1, Batf, or Batf plus Bcl2l11 gRNAs and then subjected to tolerization for 7 days. (C) Expression of Thy1, BATF, and Ki67 in modified T cells. (D) PD-1 expression in tolerized KRN T cells with representative flow plots shown (left) and conventional PD-1+ KRN T cell numbers quantitated (right). Unpaired t test; *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001, n.s. = not significant. Source data as in Fig. 6.