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Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis (Rhino ChIP-seq)

ABSTRACT: Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis (Rhino ChIP-seq)

PROVIDER: PRJNA552804 | ENA |

REPOSITORIES: ENA

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Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis (Rhino ChIP-seq)

Project description:The PIWI-interacting RNA (piRNA) pathway is an important mechanism to suppress transposon activation in the germline that is highly conserved between Drosophila and mammals. This pathway starts from transcribing piRNA clusters to generate long piRNA precursors. The majority of piRNA clusters lacks a conventional promoter, and therefore their transcription is considered to utilize a noncanonical mechanism. However, information regarding transcriptional regulation of piRNA clusters is limited. Here, we report that the fly KAT6 acetyltransferase, Enok, is important for transposon silencing in the germline. Further small RNA-seq analysis revealed that Enok is critical for piRNA production from a specific subset of piRNA clusters including 42AB, one of the two major sources of piRNAs. Enok is the major enzyme for establishing the H3K23ac mark, and was shown to promote gene expression by acetylating H3K23. Surprisingly, our RNA-seq and ChIP-seq/ChIP-qPCR results suggest that Enok regulates expression of genes involved in the piRNA production by H3K23ac-dependent mechanisms, and also promotes transcription at piRNA clusters through H3K23ac-independent pathways. Our co-immunoprecipitation assay further suggests that Enok interacts with RNA polymerase II to facilitate transcription of piRNA clusters. Taken together, our study provides novel insights into the regulation of noncanonical transcription at piRNA clusters and transposon silencing.

2021-01-07 | GSE133847 | GEO

Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis [Enok ChIP-seq]

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Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis [ncRNA-seq]

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Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis [Pol II ChIP-seq]

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Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis [H3 and H3K23 ChIP-seq]

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Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis [Enok ChIP-seq]

Project description:Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis [Enok ChIP-seq]

| PRJNA414629 | ENA

Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis

Project description:Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis

| PRJNA414632 | ENA

Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis [ncRNA-seq]

Project description:Acetyltransferase Enok regulates transposon silencing by promoting transcription at piRNA clusters and genes involved in piRNA biosynthesis [ncRNA-seq]

| PRJNA414634 | ENA

The Drosophila ZAD zinc finger protein Kipferl guides Rhino to piRNA clusters (sRNA-Seq)

Project description:RNA interference systems depend on the synthesis of small RNA precursors whose sequences define the target spectrum of these silencing pathways. The Drosophila Heterochromatin Protein 1 (HP1) variant Rhino permits transcription of PIWI-interacting RNA (piRNA) precursors within transposon-rich heterochromatic loci in germline cells. Current models propose that Rhino’s specific chromatin occupancy at piRNA source loci is determined by histone marks and maternally inherited piRNAs, but also imply the existence of other, undiscovered specificity cues. Here, we identify a member of the diverse family of zinc finger associated domain (ZAD)-C2H2 proteins, Kipferl, as critical Rhino cofactor in ovaries. By binding to guanosine-rich DNA motifs and interacting with the Rhino chromodomain, Kipferl recruits Rhino to specific loci and stabilizes it on chromatin. In kipferl mutant flies, Rhino is lost from most of its target chromatin loci and instead accumulates on pericentromeric satellite arrays, resulting in decreased levels of transposon targeting piRNAs and impaired fertility. Our findings reveal that DNA sequence, in addition to the H3K9me3 mark, determines the identity of piRNA source loci and provide insight into how Rhino might be caught in the crossfire of genetic conflicts.

2022-05-15 | GSE202467 | GEO