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

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Drosophila melanogaster

PROVIDER: GSE105101 | GEO | 2021/01/07

REPOSITORIES: GEO

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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: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 | GSE105025 | GEO

Acetyltransferase Enok regulates transposon silencing and piRNA cluster transcription.

Project description:The piRNA pathway is a highly conserved mechanism to repress transposon activation in the germline in Drosophila and mammals. This pathway starts from transcribing piRNA clusters to generate long piRNA precursors. The majority of piRNA clusters lack conventional promoters, and utilize heterochromatin- and HP1D/Rhino-dependent noncanonical mechanisms for transcription. However, information regarding the transcriptional regulation of piRNA clusters is limited. Here, we report that the Drosophila acetyltransferase Enok, which can activate transcription by acetylating H3K23, is critical for piRNA production from 54% of piRNA clusters including 42AB, the major piRNA source. Surprisingly, we found that Enok not only promotes rhino expression by acetylating H3K23, but also directly enhances transcription of piRNA clusters by facilitating Rhino recruitment. Taken together, our study provides novel insights into the regulation of noncanonical transcription at piRNA clusters and transposon silencing.

| S-EPMC7877743 | biostudies-literature

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

2021-01-07 | GSE105099 | GEO

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

2021-01-07 | GSE133847 | GEO

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

2021-01-07 | GSE105031 | GEO

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

2021-01-07 | GSE154839 | GEO

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 [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 [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

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

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

| PRJNA552804 | ENA

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