Effect of HS2 and HS3 elements on erythroid-specific expression in transgenic mice

摘要

The expression plasmids CMV/GFP, HS2ALL, HS3ALL and HS23ALL were selected to investigate the effect of HS2 and HS3 element on erythroid-specific expression in transgenic mice. These plasmids were digested with restriction enzymes and purified. And five DNA fragments, CMV/GFP, HS2/GFP, CMV/HS2/GFP, HS23/GFP and HS3/GFP were obtained. After purification, the above DNA fragments were microinjected into the pre-nuclei of the mice fertilized eggs and transgenic mice were generated, with an integration rate of 10.89%. The green fluorescence protein(GFP) expression in many transgenic mouse tissues was determined by FACS analysis. The results showed that the HS2 and 1.7 kb of β-globin gene promoter were sufficient for the erythroid-specific expression of β-globin gene. The GFP expression of different recombinant constructs was also analyzed in blood of all the transgenic mice with FACS. The results indicated that HS2 and HS3 had the same enhancement activity on the regulation of β-globin gene expression. Moreover, these two elements showed a significant synergistic effect on gene expression at the transgenic mouse level, although the GFP expression varied largely among different transgenic mouse litters.