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• W2073035527 abstract "Mature spermatozoa of most animal species can spontaneously take up foreign DNA molecules which can be delivered to embryos upon fertilization. Following this procedure, transgenic animals of various species have been generated. We recently discovered a reverse transcriptase (RT) activity in mouse spermatozoa that can reverse-transcribe exogenous RNA molecules into cDNA copies. These cDNA copies are transferred to embryos at fertilization, mosaic propagated as non-integrated structures in tissues of founder individuals and further transmitted to F1 progeny. Reverse-transcribed sequences behave as functional genes, being correctly expressed in tissues of F0 and F1 animals. To learn more about this mechanism and further characterize the reverse transcription step, we have now incubated spermatozoa with a plasmid harboring a green fluorescent protein (EGFP) retrotransposition cassette interrupted by an intron in the opposite orientation to the EGFP gene. We found that reverse-transcribed spliced EGFP DNA sequences are generated in sperm cells and transmitted to embryos in IVF assays. After implantation in foster mothers, embryos developed into mice that expressed EGFP in the blood vessel endothelia of a variety of organs. The EGFP-encoding cDNA sequences were detected in positive tissues as extrachromosomal mosaic-propagated structures, maintained in low-copy number (<1 copy/genome), and mosaic transmitted from founders to the F1 progeny. These results indicate that an efficient machinery is present in mature spermatozoa, which can transcribe, splice, and reverse-transcribe exogenous DNA molecules. This mechanism is implicated in the genesis and non-Mendelian propagation of new genetic information besides that contained in chromosomes. Mol. Reprod. Dev. © 2006 Wiley-Liss, Inc." @default.
• W2073035527 created "2016-06-24" @default.
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• W2073035527 date "2006-01-01" @default.
• W2073035527 modified "2023-10-15" @default.
• W2073035527 title "Generation of biologically active retro-genes upon interaction of mouse spermatozoa with exogenous DNA" @default.
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• W2073035527 doi "https://doi.org/10.1002/mrd.20550" @default.
• W2073035527 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16850445" @default.
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