Position independence and proper developmental control of gamma-globin gene expression require both a 5' locus control region and a downstream sequence element.

Abstract excerpt

We have analyzed the expression of human gamma-globin genes during development in F2 progeny of transgenic mice carrying two types of constructs. In the first type, gamma-globin genes were linked individually to large (approximately 4-kb) sequence fragments spanning locus control region (LCR) hypersensitive site 2 (HS2) or HS3. These LCR fragments contained not only the core HS elements but also extensive...

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