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Macrophage CEBPD dependent gene expression

ABSTRACT: Macrophage CEBPD dependent gene expression

PROVIDER: PRJNA726152 | ENA |

REPOSITORIES: ENA

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Macrophage CEBPD dependent gene expression

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Project description:CCAAT/enhancer-binding protein delta (C/EBPδ) is a member of the C/EBP family of transcription factors. According to the current paradigm, C/EBPδ potentiates cytokine production and modulates macrophage function thereby enhancing the inflammatory response. Remarkably, however, C/EBPδ deficiency does not consistently lead to a reduction in Lipopolysaccharide (LPS)-induced cytokine production by macrophages. Here, we address this apparent discrepancy and show that the effect of C/EBPδ on cytokine production and macrophage function depends on both the macrophage subtype and the LPS concentration used. Using CRISPR-Cas generated macrophages in which the transactivation domain of C/EBPδ was deleted from the endogenous locus (ΔTAD macrophages), we next show that the context-dependent role of C/EBPδ in macrophage biology relies on compensatory transcriptional activity in the absence of C/EBPδ. We extend these findings by revealing a large discrepancy between transcriptional programs in C/EBPδ knock-out and C/EBPδ transactivation dead (ΔTAD) macrophages implying that compensatory mechanisms do not specifically modify C/EBPδ-dependent inflammatory responses but affect overall macrophage biology. Overall, these data imply that knock-out approaches are not suited for identifying the genuine transcriptional program regulated by C/EBPδ, and we suggest that this phenomenon applies for transcription factor families in general.

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Identification of CEBPD regulated genes in MCF7 cells

Project description:Purpose: To determine which genes are regulated by CEBPD in MCF-7 cells. Methods: MCF7 cells were transfected with siRNAs against CEBPD or control. After 48h transfection total RNAs from two independent experiments were extracted and subjected to deep sequencing following Illumina standard protocols. Results: Samples were aligned to the reference human genome hg19 with good alignment ranging from 84 – 85% for both reads and very low mismatch rates <0.35%. RNA mapping statistics calculated using Picard software reported mapping of samples to 86 % mRNA bases, 63-65% unique reads, and <2.6% ribosomal reads. The aligned BAM files were imported into Partek Genome Studio v6.4 following the RNA-Seq workflow. Briefly, metadata about the samples was added followed by normalizing counts and doing differential expression analysis with ANOVA for the siNS vs siCEBPD contrasts. Differential gene list were created based on a p-value cutoff of <0.05 and fold-change of >1.5 or < -1.5. Analysis revealed that C/EBPδ supports the expression of 319 genes (downregulated by siCEBPD) and attenuates the expression of 238 genes (induced by siCEBPD). For validation, 31 genes were assessed by QPCR with mRNA samples independent of those used for mRNA-Seq, and also by silencing CEBPD with either one of two siRNA sequences. About 90% of the tested genes from the mRNA-Seq approach were validated as C/EBPδ-regulated in MCF-7 cells by QPCR. Conclusions: Our study is the first characterization of the CEBPD transcriptome generated by RNA-seq in MCF7 cells with biological replicates.

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2021-04-27 | GSE173296 | GEO

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