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Dazl maintains proliferating germ cells through a network of polyA-proximal mRNA interactions [Adult PolyA-Seq]

ABSTRACT: Dazl (deleted in azoospermia like) is a member of the DAZ family of germ cell-restricted RNA binding proteins required for gametogenesis from worm to human. The direct RNA targets and functions of these essential proteins are poorly understood. Here, we generated high-resolution, transcriptome-wide maps of Dazl-RNA interactions in mouse testes. These maps provide important insights into the mechanism of Dazl recruitment to mRNA and reveal Dazl binding to thousands of mRNAs predominantly through sequence-specific interactions near the polyA tail. Using transgenic mice and fluorescence activated cell sorting (FACS), we isolated DAZL knockout germ cells and used RNA-Seq to identify mRNAs sensitive to DAZL-ablation. Intersecting the RNA-Seq and Dazl-RNA interaction datasets revealed that Dazl enhances expression of a subset of directly-bound transcripts, namely mRNAs for a network of essential cell cycle regulatory genes. Collectively, our integrative analysis delineates a Dazl-dependent post-transcriptional gene regulatory program essential for mammalian germ cell maintenance.

ORGANISM(S): Mus musculus

PROVIDER: GSE108991 | GEO | 2018/05/22

REPOSITORIES: GEO

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Dazl maintains proliferating germ cells through a network of polyA-proximal mRNA interactions [Spermatogonia PolyA-Seq]

Project description:Dazl (deleted in azoospermia like) is a member of the DAZ family of germ cell-restricted RNA binding proteins required for gametogenesis from worm to human. The direct RNA targets and functions of these essential proteins are poorly understood. Here, we generated high-resolution, transcriptome-wide maps of Dazl-RNA interactions in mouse testes. These maps provide important insights into the mechanism of Dazl recruitment to mRNA and reveal Dazl binding to thousands of mRNAs predominantly through sequence-specific interactions near the polyA tail. Using transgenic mice and fluorescence activated cell sorting (FACS), we isolated DAZL knockout germ cells and used RNA-Seq to identify mRNAs sensitive to DAZL-ablation. Intersecting the RNA-Seq and Dazl-RNA interaction datasets revealed that Dazl enhances expression of a subset of directly-bound transcripts, namely mRNAs for a network of essential cell cycle regulatory genes. Collectively, our integrative analysis delineates a Dazl-dependent post-transcriptional gene regulatory program essential for mammalian germ cell maintenance.

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Dazl regulates germ cell survival through a network of polA-proximal mRNA interactions [GC1-spg cells (parental line) iCLIP]

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Project description:The RNA binding protein Dazl is essential for gametogenesis, but its direct in vivo functions, RNA targets, and the molecular basis for germ cell loss in DAZL null mice are unknown. Here, we mapped transcriptome-wide Dazl-RNA interactions in vivo, revealing Dazl binding to thousands of mRNAs via polyA-proximal 3?UTR interactions. In parallel, fluorescence activated cell sorting and RNA-Seq identified mRNAs sensitive to Dazl deletion in male germ cells. Despite binding a broad set of mRNAs, integrative analyses indicate that Dazl post-transcriptionally controls only a subset of its mRNA targets, namely those corresponding to a network of genes critical for germ cell proliferation and survival. Additionally, we provide evidence that polyA sequences have key roles in specifying Dazl-RNA interactions across the transcriptome. Altogether, our results reveal a mechanism for Dazl-RNA binding, and illustrate that Dazl functions as a master regulator of a post-transcriptional mRNA program essential for germ cell survival.

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