Developmental Specificity of the Interaction between the Locus Control Region and Embryonic or Fetal Globin Genes in Transgenic Mice with an HS3 Core Deletion

ABSTRACT The human β-globin locus control region (LCR) consists of five erythroid-lineage-specific DNase I-hypersensitive sites (HSs) and is required for activation of the β-globin locus chromatin domain and globin gene expression. Each DNase I-HS of the LCR consists of a highly conserved core element and flanking sequences. To analyze the functional role of the core elements of the HSs, we deleted a 234-bp fragment encompassing the core of HS3 (HS3c) from a β-globin locus residing on a 248-kb β-locus yeast artificial chromosome and analyzed its function in F2 progeny of transgenic mice. Human ɛ-globin gene expression was absent at day 10 and severely reduced in the day 12 embryonic erythropoiesis of mice lacking HS3c. In contrast, γ-globin gene expression was normal in embryonic erythropoiesis but it was absent in definitive erythropoiesis in the fetal liver. These results indicate that the core element of HS3 is necessary for ɛ-globin gene transcription in embryonic cells and for γ-globin gene transcription in definitive cells. Normal γ-globin gene expression in embryonic cells and the absence of γ-globin gene expression in definitive cells show that different HSs interact with γ-globin gene promoters in these two stages of development. Such results provide direct evidence for developmental stage specificity of the interactions between the core elements of HSs and the promoters of the globin genes.

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