Fig. 6.
LacZ expression in erythroid and megakaryocytic lineages driven by the 4 × GATA promoter.
Hematopoietic cells were generated from ES cells by the addition of TPO (A, E, I), EPO (B, F, J for primitive embryonic erythrocytes and C, G, K for definitive adult erythrocytes), and M-CSF (D, H, L) for megakaryocytes, erythroid cells, and macrophages, respectively. The wild-type (−598/+33) (A-D), the 4 × GATA (E-H), and the 4 × ETS promoters (I-L) were transfected into ES cells; differentiation induction was carried out; and the cells were stained with X-gal. Double staining with AChE was performed to confirmLacZ expression in megakaryocytes (A, E, I). The 4 × GATA promoter was active in megakaryocytes (E), primitive embryonic erythrocytes (F), and definitive adult erythrocytes (G), but was inactive in macrophages (H).