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Eastwood, E.L., Jara, K.A., Bornelöv, S., Munafò, M., Frantzis, V., Kneuss, E., Barbar, E.J., Czech, B., Hannon, G.J. (2021). Dimerisation of the PICTS complex via LC8/Cut-up drives co-transcriptional transposon silencing in Drosophila.  eLife 10(): e65557.
FlyBase ID
FBrf0248008
Publication Type
Research paper
Abstract

In animal gonads, the PIWI-interacting RNA (piRNA) pathway guards genome integrity in part through the co-transcriptional gene silencing of transposon insertions. In Drosophila ovaries, piRNA-loaded Piwi detects nascent transposon transcripts and instructs heterochromatin formation through the Panoramix-induced co-transcriptional silencing (PICTS) complex, containing Panoramix, Nxf2 and Nxt1. Here, we report that the highly conserved dynein light chain LC8/Cut-up (Ctp) is an essential component of the PICTS complex. Loss of Ctp results in transposon de-repression and a reduction in repressive chromatin marks specifically at transposon loci. In turn, Ctp can enforce transcriptional silencing when artificially recruited to RNA and DNA reporters. We show that Ctp drives dimerisation of the PICTS complex through its interaction with conserved motifs within Panoramix. Artificial dimerisation of Panoramix bypasses the necessity for its interaction with Ctp, demonstrating that conscription of a protein from a ubiquitous cellular machinery has fulfilled a fundamental requirement for a transposon silencing complex.

PubMed ID
PubMed Central ID
PMC7861614 (PMC) (EuropePMC)
Related Publication(s)
FlyBase analysis

Assignment of cell line based on information provided by the author in the Fast Track Your Paper tool.
FlyBase Curators, 2020-, Assignment of cell line based on information provided by the author in the Fast Track Your Paper tool. [FBrf0247694]

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Secondary IDs
    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    eLife
    Title
    eLife
    ISBN/ISSN
    2050-084X
    Data From Reference