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Learn MoreFoxA transcription factors are critical for liver development through their pioneering activity, which initiates a highly complex network thought to become resistant to the loss of any individual hepatic transcription factor via mutual redundancy. To investigate the dispensability of FoxA factors for this regulatory network, we ablated all FoxA genes in the adult liver. Remarkably, loss of FoxA caused a rapid and massive reduction in the expression of key liver genes back to the low levels of the fetal prehepatic endoderm stage, leading to necrosis and lethality within days. Mechanistically, we found FoxA proteins to be required for maintaining chromatin activity, nucleosome positioning and binding by other hepatic transcription factors. Thus, the hepatic gene regulatory network is dependent on the FoxA proteins throughout life. SOURCE: Klaus,H,Kaestner (kaestner@pennmedicine.upenn.edu) - University of Pennsylvania
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