Barckmann B., El-Barouk M., Pelisson A., Mugat B., Li B., Franckhauser C., Lavier A. S. F., Mirouze Marie, Fablet M., Chambeyron S. (2018). The somatic piRNA pathway controls germline transposition over generations. Nucleic Acids Research, 46 (18), p. 9524-9536. ISSN 0305-1048.
Titre du document
The somatic piRNA pathway controls germline transposition over generations
Barckmann B., El-Barouk M., Pelisson A., Mugat B., Li B., Franckhauser C., Lavier A. S. F., Mirouze Marie, Fablet M., Chambeyron S.
Source
Nucleic Acids Research, 2018,
46 (18), p. 9524-9536 ISSN 0305-1048
Transposable elements (TEs) are parasitic DNA sequences that threaten genome integrity by replicative transposition in host gonads. The Piwi-interacting RNAs (piRNAs) pathway is assumed to maintain Drosophila genome homeostasis by downregulating transcriptional and post-transcriptional TE expression in the ovary. However, the bursts of transposition that are expected to follow transposome derepression after piRNA pathway impairment have not yet been reported. Here, we show, at a genome-wide level, that piRNA loss in the ovarian somatic cells boosts several families of the endogenous retroviral subclass of TEs, at various steps of their replication cycle, from somatic transcription to germinal genome invasion. For some of these TEs, the derepression caused by the loss of piRNAs is backed up by another small RNA pathway (siRNAs) operating in somatic tissues at the post transcriptional level. Derepressed transposition during 70 successive generations of piRNA loss exponentially increases the genomic copy number by up to 10-fold.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
