Abstract:
:Dictyostelium intermediate repeat sequence 1 (DIRS-1) is the founding member of a poorly characterized class of retrotransposable elements that contain inverse long terminal repeats and tyrosine recombinase instead of DDE-type integrase enzymes. In Dictyostelium discoideum, DIRS-1 forms clusters that adopt the function of centromeres, rendering tight retrotransposition control critical to maintaining chromosome integrity. We report that in deletion strains of the RNA-dependent RNA polymerase RrpC, full-length and shorter DIRS-1 messenger RNAs are strongly enriched. Shorter versions of a hitherto unknown long non-coding RNA in DIRS-1 antisense orientation are also enriched in rrpC- strains. Concurrent with the accumulation of long transcripts, the vast majority of small (21 mer) DIRS-1 RNAs vanish in rrpC- strains. RNASeq reveals an asymmetric distribution of the DIRS-1 small RNAs, both along DIRS-1 and with respect to sense and antisense orientation. We show that RrpC is required for post-transcriptional DIRS-1 silencing and also for spreading of RNA silencing signals. Finally, DIRS-1 mis-regulation in the absence of RrpC leads to retrotransposon mobilization. In summary, our data reveal RrpC as a key player in the silencing of centromeric retrotransposon DIRS-1. RrpC acts at the post-transcriptional level and is involved in spreading of RNA silencing signals, both in the 5' and 3' directions.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Wiegand S,Meier D,Seehafer C,Malicki M,Hofmann P,Schmith A,Winckler T,Földesi B,Boesler B,Nellen W,Reimegård J,Käller M,Hällman J,Emanuelsson O,Avesson L,Söderbom F,Hammann Cdoi
10.1093/nar/gkt1337subject
Has Abstractpub_date
2014-03-01 00:00:00pages
3330-45issue
5eissn
0305-1048issn
1362-4962pii
gkt1337journal_volume
42pub_type
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