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Role of gene order in developmental control of human gamma- and beta-globin gene expression.

Department of Medicine, University of Washington, Seattle 98195.

ABSTRACT

To determine the effect of gene order on globin gene developmental regulation, we produced transgenic mice containing two tandemly arranged gamma- or beta-globin or gamma beta- and beta gamma-globin genes linked to a 2.5-kb cassette containing sequences of the locus control region (LCR). Analysis of constructs containing two identical gamma or beta genes assessed the effect of gene order on globin gene expression, while analysis of constructs containing tandemly arranged gamma and beta genes assessed any additional effects of the trans-acting environment. When two gamma genes were tandemly linked to the LCR, expression from the proximal gamma gene was three- to fourfold higher than expression from the distal gamma gene, and the ratio of proximal to distal gene expression remained unchanged throughout development. Similarly, when two beta genes were tandemly linked to the LCR, the proximal beta gene was predominantly expressed throughout development. These results indicate that proximity to LCR increases gene expression, perhaps by influencing the frequency of interaction between the LCR and globin gene promoters. An arrangement where the gamma gene was proximal and the beta gene distal to the LCR resulted in predominant gamma-gene expression in the embryo. When the order was reversed and the gamma gene was placed distally to the LCR, gamma-gene expression in the embryo was still up to threefold higher than expression of the LCR-proximal beta gene. These findings suggest that the embryonic trans-acting environment interacts preferentially with the gamma genes irrespective of their order or proximity to the LCR. We conclude that promoter competition rather than gene order plays the major role in globin gene switching.

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