Abstract
The entire 1731 retrotransposon of Drosophila melanogaster, tagged with the E. coli lac Z gene inserted in its gag sequence, was injected into oocytes and fertilized eggs of the urodele amphibian Pleurodeles waltl. Expression of the reporter gene indicated that the 1731 promoter (its 5′LTR) is active in the embryos and not in the oocytes. It appeared that this element is regulated as amphibian genes are at the beginning of the development, i.e. that expression was detected after the mid blastula stage and maintained up to four or five days after injection. Another construction associating the modified 1731 promoter with the CAT gene is also expressed in Pleurodeles embryos during the same period of development. This indicated that the 1731 promoter issued from a Drosophila species is activated as promoting sequences of amphibian zygotic genes are, suggesting that in the case of horizontal transfer, 1731 can be expressed into vertebrate organisms.
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Kim, M.H., Aimar, C., Best-Belpomme, M. et al. The microinjected Drosophila melanogaster 1731 retrotransposon is activated after the midblastula stage of the amphibian Pleurodeles waltl development. Genetica 92, 107–114 (1994). https://doi.org/10.1007/BF00163759
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DOI: https://doi.org/10.1007/BF00163759