Abstract
Transcription initiated within the mouse mammary tumor virus (MTV) long terminal repeat (LTR) is regulated by glucocorticoids, androgens, and estrogen. However, expression of the virus in vivo and transcription of MTV LTR fusion genes in transgenic mice are not readily interpretable solely in terms of the influence of these hormones. To investigate whether there is a regulatory role for sequences within the LTR but outside the region known to be responsible for glucocorticoid induction, we have produced transgenic mice carrying genes in which various regions of the LTR have been linked to the human growth hormone gene. Analysis of expression of the fusion genes in these transgenic mice has demonstrated that the 5' end of the LTR can profoundly influence transcription initiated within the MTV LTR.
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