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Learn MoreETO2 functions as a transcription repressor and is required for the embryonic erythropoiesis and the hemoglobin switch. To gain insight into ETO2 regulatory function during human erythropoiesis, we performed RNA-seq for WT and ETO2 KO K562 cells and found that up-regulated genes upon ETO2 loss in human cells included many markers of mature erythroid cells EPB42, ALAS2, GYPA and SLC25a37. Notably, the -globin genes (HBA1, HBA2 and HBZ) and embryonic and fetal -globin genes (HBE1, HBG1, and HBG2) were significantly increased after deletion of ETO2. By contrast, deletion of ETO2 down-regulated the transcription factor genes (ETS1, KLF8 and SOX6) which play a negative role in globin gene expression and hemoglobin synthesis. To further explore different domain function of ETO2, we have analyzed our RNA-seq data from domain deletion cell lines compared to the cell line expressing wild type ETO2. Generally, 702 genes were found to co-regulated by three domain function of ETO2. Interestingly, the regulation of fetal globin genes, erythroid regulator (SOX5) as well as epigenetic factor (HDAC7) is required by three domain function of ETO2. During mouse embryonic erythropoiesis, our FACS-sorted and normal RNA-seq data in E14.5 fetal liver cells indicated that eto2 promoted a critical developmental transition and played an important role in globin switch from embryonic to adult -globin transcription since its function is essential for key regulators (PU.1, BCL11A and ZBTB7A) and globin genes (Hbb-y and Hba-x) regulation. SOURCE: Xiang Guo (xguoellen@gmail.com) - LCDB NIH
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