| Autor: |
Robin, Chambeyron, Brun, Bucheton, Busseau |
| Zdroj: |
Molecular Genetics & Genomics; Aug2002, Vol. 267 Issue 6, p829-834, 6p |
| Abstrakt: |
I factors are non-LTR retrotransposons of Drosophila melanogaster that transpose at high frequency in the germline of females resulting from appropriate crosses, allowing in vivo studies of the retrotransposition process. Reverse transcription of a full-length RNA intermediate is thought to occur at the site of integration, using a 3′ hydroxyl group generated by endonucleolytic cleavage of the genomic DNA to prime synthesis of the first cDNA strand. This target-primed reverse transcription (TPRT) process is mediated by endonuclease and reverse transcriptase activities encoded by the element. We have designed a molecularly tagged, endonuclease-defective I element that can be mobilised with high efficiency by constructs that express the product of the I factor ORF2 in trans. This indicates that the endonuclease activity required for retrotransposition of the I factor can be provided in trans. Using this system, we show that the endonuclease domain of the R1Bm retrotransposon from Bombyx mori cannot functionally replace that of the I factor. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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