The +41kb Irf8 enhancer is required pDC maturation but not MYC repression on specification.
(A) CD117intCD226+ pre-cDC1s. (B) ALP (SiglecH−Ly6D−), BLP (SiglecH−Ly6D+), and pre-pDC (SiglecH+Ly6D+) populations illustrated above, and the same bulk pregate population illustrated on the basis of MYC-GFP and CD117 expression. (C) Bulk BM pDCs illustrated on the basis of CCR9 and MYC-GFP expression above, or maturation markers CCR9 and MHCII below. (D) Analysis of BM pDCs on the basis of Mycl-GFP and CCR9 expression for the indicated genotypes on a MyclGFP and Irf8 +41kb−/− background. (E) Pre-cDC2s illustrated on the basis of Ly6C and MYC-GFP expression above, and CD117 and MYC-GFP expression below. Flow cytometry of BM from mice with the indicated genotypes on the MycGFP/GFP background. All populations quantified as percent frequency of the parent population defined by the indicated pregate. Data are representative of two independent experiments (n = 6). (F) Mycl-GFP expression in bulk BM pDCs as defined in D for the indicated genotypes.