Transcriptional regulation of globin gene expression in the human erythroid cell line K562

The effect of hemin on the rate of synthesis and the level of globin messenger RNA9s in the human erythroid cell line K562 was examined by means of cloned hybridization probes specific for each of the human embryonic, fetal, and adult globin genes. Hemin increases both the rate of transcription and the level of accumulation of zeta-, epsilon-, gamma-, and alpha-globin messenger RNA9s by a factor of 3 to 5. Thus, hemin induction of globin gene expression in K562 cells is at the level of transcription.