Deciphering the Innate Lymphoid Cell Transcriptional Program

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Deciphering the Innate Lymphoid Cell Transcriptional Program Cyril Seillet, Lisa A. Mielke, Daniela B. Amann-Zalcenstein, Shian Su, Jerry Gao, Francisca F. Almeida, Wei Shi, Matthew E. Ritchie, Shalin H. Naik, Nicholas D. Huntington, Sebastian Carotta, Gabrielle T. Belz  Cell Reports  Volume 17, Issue 2, Pages 436-447 (October 2016) DOI: 10.1016/j.celrep.2016.09.025 Copyright © 2016 The Author(s) Terms and Conditions

Cell Reports 2016 17, 436-447DOI: (10.1016/j.celrep.2016.09.025) Copyright © 2016 The Author(s) Terms and Conditions

Figure 1 Identification of Innate Lymphoid Precursors in the Bone Marrow (A) Flow cytometric analysis of CLP and αLP bone marrow cells from ID2gfp/gfp mice gated on lin− CD127+c-kitintSca-1int cells. Expression of ID2, CD25, and c-kit is shown within the αLP populations. (B) Histograms showing the expression of PLZF and TCF-1 in the indicated populations. Data are representative of three similar experiments. Cell Reports 2016 17, 436-447DOI: (10.1016/j.celrep.2016.09.025) Copyright © 2016 The Author(s) Terms and Conditions

Figure 2 The Transcriptional Landscape of ILC Development CEL-seq analysis was performed on highly purified precursors as defined in Figures 1 and S2. (A) MDS of the CEL-seq results obtained from the CLP (red), α4β7+ CLP (purple), αLP (green), and ILC2p (blue) populations. Each point represents a different sample, and samples are color-coded by population. (B and C) Comparison of gene expression in (B) αLP versus CLP cells and in (C) ILC2p versus αLP in smear plots. Colored dots indicate genes significantly upregulated in CLP (red), αLP (green), and ILC2p (blue). (D) Heatmap showing the differentially expressed genes across ILC progenitor developmental stages. Data were row-normalized and hierarchically clustered by gene and subset. Genes are color-coded (see legend) to display relative gene expression. (E) K-means clustering into six clusters based on expression pattern during early ILC differentiation. Shown is the expression of genes (log2-transformed mean-centered, gray lines) and cluster centroids (black line) for each cluster. Cell Reports 2016 17, 436-447DOI: (10.1016/j.celrep.2016.09.025) Copyright © 2016 The Author(s) Terms and Conditions

Figure 3 Molecular Characterization of the αLP (A) Heatmap representation of genes with at least 2-fold differences in expression pattern between CLP and αLP. Columns represent the indicated cell subsets in seven to eight biological replicates. Gene sets are clustered according to their biological function based on the gene families of the MSigDB database. (B and C) Histograms show intracellular expression of (B) GATA-3 and LMO4 (left) and GFP expression of IRF8gfp/+ and PU.1gfp/+ reporter mice (right) and (C) surface expression of PD-1 and CD226 in the indicated populations. Data are representative of two independent experiments (n = 2–3 mice/experiment). (D) Histograms showing intracellular expression of PLZF and GATA-3 in the PD1+ and PD1− fraction of the αLP. Data are representative of two independent experiments (n = 2 mice/experiment). (E) GSEA was performed to compare the CLP and αLP transcriptional profile with the KEGG and the MSigDB C5 GO. (F) KEGG pathways are significantly enriched in αLP. Cell Reports 2016 17, 436-447DOI: (10.1016/j.celrep.2016.09.025) Copyright © 2016 The Author(s) Terms and Conditions

Figure 4 Development of ILC Precursors Gradually Depends on Nfil3, Tcf7, and Id2 (A) Counts per million mapped reads for Nfil3, Tcf7, and Id2 in CLP, α4β7+ CLP, αLP, and ILC2p are shown (mean ± SD). (B) Flow cytometric analyses of lineage− bone marrow cells from wild-type (WT), Id2fl/flVavCre+/T, Tcf7−/−, and Nfil3−/− mice. The profiles show the frequency of each progenitor subset gated on live lin− CD127+ cells. The data show one of two representative experiments. (C) Total cell number of the indicated populations isolated from wild-type, Id2fl/flVavCre+/T, Tcf7−/−, and Nfil3−/− mice. The data show the mean ± SD pooled from two independent experiments (n = 4). Cell Reports 2016 17, 436-447DOI: (10.1016/j.celrep.2016.09.025) Copyright © 2016 The Author(s) Terms and Conditions

Figure 5 Transient Expression of Nfil3 Is Sufficient to Induce Commitment to the ILC Lineage (A and B) Purified αLP from Nfil3+/+Id2CreERT2+/T and Nfil3fl/flId2CreERT2+/T mice were cultured with IL-7, stem cell factor (SCF(, and either (A) IL-15 or (B) IL-33 to promote their differentiation into ILC1/NK cells or ILC2, respectively. Cells were cultured for 10 days in the presence or absence of 4-OHT as indicated. Expression of NK1.1, CD49a, RORγt, and GATA-3 was analyzed by flow cytometry to track differentiation of NK cells, ILC1, ILC2, and ILC3. The profiles show one representative of two experiments with similar findings. (C) Total number of ILC1 and ILC2 recovered after 4-OH treatment of Nfil3+/+Id2CreERT2+/T and Nfil3fl/flId2CreERT2+/T cells in vitro. The data show the mean ± SD pooled from two independent experiments (n = 4). (D) Deletion of the Nfil3 allele was analyzed using PCR on purified NK cells cultured from Nfil3fl/flId2CreERT2+/T or Nfil3+/+Id2CreERT2+/T cells with or without treatment with 4-OHT. Ladder, 10 kb. (E and F) Nfil3fl/flId2CreERT2+/T and control Nfil3+/+Id2CreERT2+/T mice were treated with tamoxifen for 10 days, and ILC1, 2, and 3 were analyzed in the mesenteric lymph nodes (mLN) (left) and liver (right). (E) Histograms show the mean frequency of cells ± SD of data pooled from two independent experiments (n = 6 mice/genotype). Profiles are gated on CD45+CD19−CD3− cells. (F) Deletion of the Nfil3 allele was analyzed using PCR on purified NK cells or T cells from mice analyzed in (E). Ladder, 10 kb. Cell Reports 2016 17, 436-447DOI: (10.1016/j.celrep.2016.09.025) Copyright © 2016 The Author(s) Terms and Conditions

Figure 6 Id2 and Tcf7 Regulate Distinct Transcriptional Programs to Repress Stem Cell, B Cell, and T Cell Potential (A and B) Comparison of gene expression between αLP from (A) WT and Id2fl/flVavCre+/T (Id2−/−) cells and in (B) WT and Tcf7−/− mice shown in smear plots. (C and D) Venn diagrams showing unique and overlapping genes. Shown are (C) upregulated and (D) downregulated genes in Id2−/− and Tcf7−/− αLP. Complete lists of genes in each Venn category are listed in Table S3. (E and F) Gene set enrichment analysis of genes (shaded rectangles,horizontally ranked by moderated t statistic) upregulated (pink, t > 1), downregulated (blue, t < −1), or not altered (gray) in Id2−/− and Tcf7−/− αLP relative to their expression in wild-type αLP (vertical black lines indicate genes encoding for the indicated gene sets). Cell Reports 2016 17, 436-447DOI: (10.1016/j.celrep.2016.09.025) Copyright © 2016 The Author(s) Terms and Conditions