Abstract
The rat gene encoding oncomodulin, a small calcium-binding protein related to parvalbumin, is under the control of a solo long terminal repeat (LTR) derived from an endogenous intracisternal A-particle (IAP). This gene was the first example of a mammalian gene regulated in normal cells by a promoter of retroviral origin (see also article by D. Robins and L. Samuelson in this volume). We show here that the oncomodulin LTR is a member of a small subset of sequence related solo LTR elements present in the rat genome and that a full length IAP genome containing LTRs of this type is no longer present in the rat genome. We have assayed the transcriptional activity of the oncomodulin LTR coupled to the human growth hormone gene as a reporter. Transfections in both Hela cells and 293 cells indicate the oncomodulin LTR promoter is sufficient to efficiently initiate transcription. In 293 cells (human embryo kidney cells transformed with human adenovirus type 5 DNA), the oncomodulin LTR is a strong promoter, capable of bidirectional transcription. Finally, we have determined the structure and the sequence of the mouse oncomodulin gene. Our results suggest that the integration of the IAP particle genome within the rat oncomodulin gene occurred after the rat and the mouse became distinct species.
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Banville, D., Rotaru, M. & Boie, Y. The intracisternal A particle derived solo LTR promoter of the rat oncomodulin gene is not present in the mouse gene. Genetica 86, 85–97 (1992). https://doi.org/10.1007/BF00133713
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DOI: https://doi.org/10.1007/BF00133713