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Ye, Min; Zhang, Hong; Amabile, Giovanni; Yang, Henry; Staber, Philipp B; Zhang, Pu; Levantini, Elena; Alberich-Jordà, Meritxell; Zhang, Junyan; Kawasaki, Akira; Tenen, Daniel G
Nature cell biology, 04/2013, Letnik: 15, Številka: 4Journal Article
In blood, the transcription factor C/EBPa is essential for myeloid differentiation and has been implicated in regulating self-renewal of fetal liver haematopoietic stem cells (HSCs). However, its function in adult HSCs has remained unknown. Here, using an inducible knockout model we found that C/EBPa-deficient adult HSCs underwent a pronounced increase in number with enhanced proliferation, characteristics resembling fetal liver HSCs. Consistently, transcription profiling of C/EBPa-deficient HSCs revealed a gene expression program similar to fetal liver HSCs. Moreover, we observed that age-specific Cebpa expression correlated with its inhibitory effect on the HSC cell cycle. Mechanistically we identified N-Myc as a downstream target of C/EBPa, and loss of C/EBPa resulted in de-repression of N-Myc. Our data establish C/EBPa as a central determinant in the switch from fetal to adult HSCs.
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