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. 1995 May 25;23(10):1790–1794. doi: 10.1093/nar/23.10.1790

Function of the upstream hypersensitive sites of the chicken beta-globin gene cluster in mice.

M Reitman 1, E Lee 1, H Westphal 1
PMCID: PMC306937  PMID: 7784184

Abstract

We have shown previously that the chicken beta A-globin gene, with its 3' enhancer, is expressed in a copy number-dependent manner in transgenic mice. The expression level was low but increased approximately 6-fold upon inclusion of 11 kb of upstream DNA containing four DNase I hypersensitive sites. To study the effect of the individual upstream hypersensitive sites on transgene expression, we produced lines of mice in which the individual upstream sites were linked to the beta A gene and enhancer. RNA levels were measured in blood from adult animals. With each of these four constructs, the level of transgene RNA per DNA copy varied over a > 20-fold range. These data suggest that addition of a hypersensitive site to the beta A-globin/enhancer region abrogates its position independent expression. The average beta A-globin expression per copy in the lines carrying an upstream site was comparable with that in lines without an upstream site. Thus, no single upstream hypersensitive site accounts for the higher level of beta A-globin expression seen in mice containing the complete upstream region. We had shown previously that control of the chicken beta-globin cluster is distributed between at least two regions, the beta A/epsilon enhancer and the upstream region. Our current results suggest that the control mediated by the upstream DNA is itself distributed and is not due to a single hypersensitive site.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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