Abstract
To analyze the function of the 5' DNase I hypersensitive sites (HSs) of the locus control region (LCR) on beta-like globin gene expression, a 2.3-kb deletion of 5'HS3 or a 1.9-kb deletion of 5'HS2 was recombined into a beta-globin locus yeast artificial chromosome, and transgenic mice were produced. Deletion of 5'HS3 resulted in a significant decrease of epsilon-globin gene expression and an increase of gamma-globin gene expression in embryonic cells. Deletion of 5'HS2 resulted in only a small decrease in expression of epsilon-, gamma-, and beta-globin mRNA at all stages of development. Neither deletion affected the temporal pattern of globin gene switching. These results suggest that the LCR contains functionally redundant elements and that LCR complex formation does not require the presence of all DNase I hypersensitive sites. The phenotype of the 5'HS3 deletion suggests that individual HSs may influence the interaction of the LCR with specific globin gene promoters during the course of ontogeny.
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