A Bach2-Cebp Gene Regulatory Network for the Commitment of Multipotent Hematopoietic Progenitors

Publication date: 7 March 2017
Source:Cell Reports, Volume 18, Issue 10
Author(s): Ari Itoh-Nakadai, Mitsuyo Matsumoto, Hiroki Kato, Junichi Sasaki, Yukihiro Uehara, Yuki Sato, Risa Ebina-Shibuya, Mizuho Morooka, Ryo Funayama, Keiko Nakayama, Kyoko Ochiai, Akihiko Muto, Kazuhiko Igarashi
Hematopoietic stem cell and multipotent progenitor (MPP) commitment can be tuned in response to an infection so that their differentiation is biased toward myeloid cells. Here, we find that Bach2, which inhibits myeloid differentiation in common lymphoid progenitors, represses a cohort of myeloid genes and activates those linked to lymphoid function. Bach2 repressed both Cebpb and its target Csf1r, encoding C/EBPβ and macrophage colony-stimulating factor receptor (M-CSFr), respectively, whereas C/EBPβ repressed Bach2 and activated Csf1r. Bach2 and C/EBPβ further bound to overlapping regulatory regions at their myeloid target genes, suggesting the presence of a gene regulatory network (GRN) with mutual repression between these factors and a feedforward loop leading to myeloid gene regulation. Lipopolysaccharide reduced the expression of Bach2, resulting in enhanced myeloid differentiation. The Bach2-C/EBPβ GRN pathway thus tunes MPP commitment to myeloid and lymphoid lineages both under normal conditions and after infection.

Graphical abstract

Teaser

Microbes skew the balance of innate and acquired immune cells. Itoh-Nakadai et al. report that Bach2 and C/EBP form a gene regulatory network with mutual repression and antagonistic, feedforward regulation of myeloid genes. Bach2 tunes the commitment of multipotent progenitors to myeloid and lymphoid lineages under both normal and infectious conditions.


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