PXD045214

PXD045214 is an original dataset announced via ProteomeXchange.

Title	The PIWI-interacting protein Gtsf1 controls the selective degradation of small RNAs in Paramecium
Description	Ciliates undergo developmentally programmed genome elimination, in which small RNAs direct the removal of target DNA segments, including transposable elements. At each sexual generation, the development of the macronucleus (MAC) requires massive and reproducible elimination of a large proportion of the germline micronuclear (MIC) genome, leading to a highly streamlined somatic MAC genome. 25-nt long scnRNAs are produced from the entire germline MIC genome during meiosis, and this initial complex small RNA population is then transported to the maternal MAC, where selection of scnRNAs corresponding to germline (MIC)-specific sequences is thought to take place. Selected scnRNAs, loaded onto the PIWI protein Ptiwi09, guide the deposition of histone H3 post-translational modifications (H3K9me3 and H3K27me3) onto transposable elements in the developing macronucleus, ultimately triggering their specific elimination. How germline-specific MIC scnRNAs are selected remains to be determined. Here, we provide important mechanistic insights into the scnRNA selection pathway by identifying a Paramecium homolog of Gametocyte specific factor 1 (Gtsf1) as essential for the selective degradation of scnRNAs corresponding to retained somatic MAC sequences. Consistently, we also show that Gstf1 is exclusively localized in the maternal macronucleus, where scnRNA selection is presumed to occur, and associates with the scnRNA-binding protein Ptiwi09. Furthermore, Gtsf1 is necessary for DNA elimination and correct H3K9me3 and H3K27me3 localization in the new developing macronucleus, demonstrating that the scnRNA selection process is important for genome elimination. We propose that Gtsf1 is required for the coordinated degradation of Ptiwi09-scnRNA complexes that pair with nascent RNA transcribed from the maternal MAC genome, similarly to the mechanism suggested for microRNA target-directed degradation in metazoans.
HostingRepository	PRIDE
AnnounceDate	2024-10-17
AnnouncementXML	Submission_2024-10-17_01:47:45.806.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Guillaume CHEVREUX
SpeciesList	scientific name: Paramecium tetraurelia; NCBI TaxID: 5888;
ModificationList	monohydroxylated residue; deamidated residue; iodoacetamide derivatized residue
Instrument	timsTOF Pro 2

Revision	Datetime	Status	ChangeLog Entry
0	2023-09-08 02:13:24	ID requested
⏵ 1	2024-10-17 01:47:46	announced

10.1101/2023.09.19.558372;

submitter keyword: paramecium, transposable elements, scnRNAs selection,Gtsf1

Sandra Duharcourt
contact affiliation	Université Paris Cité, CNRS, Institut Jacques Monod, F-75013 Paris, France
contact email	sandra.duharcourt@ijm.fr
lab head
Guillaume CHEVREUX
contact affiliation	Institut Jacques Monod, CNRS UMR7592
contact email	guillaume.chevreux@ijm.fr
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD045214
     1. Label: PRIDE project
     2. Name: The PIWI-interacting protein Gtsf1 controls the selective degradation of small RNAs in Paramecium