(A) HEK293T/TLR7/NF-κB or HEK293T/TLR9/NF-κB reporter cell lines were reverse transfected with an arrayed genome-wide siRNA library, stimulated with cognate ligands, and activation of the NF-κB pathway was monitored (yellow shaded area). Integration of these data with orthogonal systems-level datasets drove the selection 546 genes (tan shaded area). 190 genes were subsequently confirmed to be required components of the TLR7 and/or TLR9 signaling response (blue shaded area). (B) Tissue expression of 34 confirmed factors that have the strongest correlations with expression profiles of both TLR7 and MyD88. Tissues and cell types are depicted on the x-axis (Blood=hematopoietic origin; Others=non-hematopoietic origin). Genes identified through the RNAi analyses are reflected on the y-axis. Previously known or unknown pathway members are indicated by black or blue bars, respectively. A continuum of blue (low expression) to red (high expression) depicts relative expression levels. (C) The network relationship between identified innate regulators and the canonical TLR7/9 signaling components is depicted. (Interaction type, protein type, and expression patterns are distinguished by differential edge color, node color, and node shape, respectively, as indicated in Figure S1G). (D) Confirmed TLR7/9 signaling cofactors were cross-profiled for their activities upon TLR5, TLR7, TLR9, TNFR, and IL-1R-mediated induction of a NF-κB-dependent reporter. Data used to generate the heatmap depicted in (D) is representative of duplicate assays with three wells per gene tested in each assay. Also see Figure S1.

Subcellular localization and functional data for identified innate regulators was curated using multiple databases (Table S6). Innate co-factors were mapped to their likely regulatory roles in TLR7 and TLR9 signaling (solid circles). SVM-based gene regulatory activity predictions are also depicted (open circles) (See Table S6). TLR7/9-specific factors are represented by green nodes, MyD88-dependent factors are indicated by red nodes, and regulators of general NF-κB activation are shown as blue nodes (See Figure 1D).

(A) THP-1 cells were transfected with indicated siRNAs, and stimulated with 5uM of R848. Five hours post-stimulation, mRNA levels of ICAM-1 were quantified by RT-PCR. The red bar reflects a threshold at which 50% of the ICAM-1 mRNA expression was inhibited compared to the negative control (Neg CTL) siRNA. (B) HEK293T/TLR7/NF-κB reporter cells were transfected with the indicated siRNAs together with an siRNA targeting RIG-I, infected with Sendai virus and luciferase reporter activity was quantified. (C) HEK293T cells were co-transfected with indicated expression vectors. Whole cell lysates (WCLs) were immunoprecipitated using FLAG antibody. Immunoprecipitatants were assayed by western blot analysis using FLAG or Myc antibodies. (D) HEK293T/TLR7/NF-κB reporter cells were transfected with indicated siRNAs, stimulated with 3uM R848 for 12 hours, and secreted IL-8 was quantified by ELISA. (E) HEK293T/TLR7/NF-κB reporter cells were transfected with indicated siRNAs. Cells were stimulated with 10uM of R848, and WCLs were immunoblotted with antibodies against IκBα and Tubulin. (F) HEK293T/TLR7/NF-κB reporter cells were transfected with indicated siRNAs, and p65 localization was detected and quantified (Green: p65; Red: nucleus). The experiments for figure 4E and 3E were performed concurrently, and the Neg CTL and MyD88 blots are shared between the two figures. The experiments for figure 4C and 3D were performed concurrently, and the Neg CTL and MyD88 data is shared between the two figures. All data shown is representative of n=3 experiments. Bar graphs in (B) and (D) are presented as mean ± SD from a representative experiment. Also see Figure S2.

(A) HEK293T cells were co-transfected with the indicated expression vectors. WCLs were immunoprecipitated using FLAG or IgG (data not shown) antibodies. Immunoprecipitatants were assayed for western blot analysis using FLAG or HA antibodies. (B) HEK293T/TLR7/NF-κB or HEK293T/TLR9/NF-κB reporter cells were transfected with the indicated siRNAs. After stimulation with 0.5uM of R848, 3uM of CpG DNA, or 10ng/ml of TNF-α, NF-κB luciferase reporter activity was quantified. C) HEK293T/TLR7/NF-κB reporter cells were transfected with indicated siRNAs and secreted IL-8 was quantified by ELISA. (D) Cells were transfected with siRNAs as in (C) and p65 localization was detected and quantified (Green: p65; Red: nucleus). (E) HEK293T/TLR7/NF-κB reporter cells were transfected with siRNAs against HRS. WCLs were harvested and immunoblotted with antibodies against IκBα and Tubulin. (F) Human MDDCs were co-transfected with indicated siRNAs and an siRNA targeting RIG-I, and subsequently infected with NDV. TNF-α and IFN-α mRNA levels were quantified by RT-PCR. Silencing of MyD88, Unc93b1, and HRS was also verified by RT-PCR (silencing of > 50% for each gene, data not shown). Data shown in (A–E) is representative of n=3 experiments. Data shown in (F) is representative of two individual donors. Data in (B) are presented as percent relative to negative control siRNAs ± SD. Data in (C), (D) and (F) are presented as mean ± SD from a representative experiment. Also see Figure S3.

(A) RAW264.7-TLR9-HA cells were transduced with the indicated shRNAs. WCLs were harvested and immunoblotted with antibodies against HA, Hrs or Tubulin. The ratio between cleaved TLR9 and tubulin was quantified by densitometry. (B) WCLs from Tlr9^−/− immortalized macrophages expressing either WT-TLR9-HA or KallR-TLR9-HA were subjected to immunoprecipitation using HA antibodies, and assayed by western blot analysis with the indicated antibodies. (C) UNC93B1 was co-expressed with WT-TLR9-HA and KallR-TLR9-HA in Tlr9^−/− MEF cell lines. WCLs were immunoprecipitated with HA antibodies, and assayed by western blot analysis with the indicated antibodies. (D) HEK293T cells were co-transfected with the indicated plasmids and WCLs were subjected to immunoprecipitation using anti-HA beads or IgG antibodies (data not shown). Proteins were detected by western blot analysis using antibodies against HA, FLAG or ubiquitin. E) Cell lines described in (B) were stimulated with the indicated TLR ligands and intracellular TNF-α was quantified. Data shown are the percent of total live cells present in the TNF⁺ gate for a representative experiment. (F) Cell lines described in (B) were infected with GAS and intracellular bacteria content was quantified. (G) Western blot analysis of WCLs from panel (E). (H) Purified phagosomes/endolysosomes were assayed by western blotting with an anti-HA antibody. Data shown in (A–E) and (G–H) are representative of n=3 experiments. Data shown in (F) is representative of n=2 experiments, each done in triplicate. Bar graphs in (E) and (F) are presented as mean ± SD from a representative experiment. Also see Figure S4.