C/EBPα acts as an RNA binding protein essential for its chromatin recruitment and promotes Macrophage differentiation
Zhang, Y.; Bassal, M.; Friedrich, D.; Ummarino, S.; Verbiest, T.; Zhang, J.; Tenen, D.; Haribabu, A.; Tenen, D. G.
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C/EBP has known to be a transcription factor that involved in Neutrophil differentiation for decades. However, exploring the Chromatin RNA Immunoprecipitation Sequencing (RIP), we discover that C/EBP is a RNA binding protein mainly interacts with RNA introns. Structure study and RNA electrophoretic mobility shift assay (REMSA) show that C/EBP interacts with RNA through two novel RNA binding domains distinct from its DNA binding domain. Mouse bone marrow transplantation and in vitro cytokine assay reveal that C/EBP RNA binding is critical for Macrophage differentiation but not Neutrophil differentiation. Mechanically, RNA binding domains control specific gene transcription. In particular, PU.1 intron 4 RNA interacts with C/EBP and recruit C/EBP to its enhancer site, which facilitate PU.1 expression. Taken together, C/EBP is demonstrated to be a RNA binding protein with unique function distinct from its DNA binding activity. Our finding transforms our knowledge of transcriptional regulation by transcription factor. One-Sentence SummaryC/EBP interacts with RNA through novel RNA binding domains and regulates PU.1 expression during Macrophage differentiation.
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