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CLAMP and Zelda function together as pioneer transcription factors to promote Drosophila zygotic genome activation [ChIP-Seq]

ABSTRACT: CLAMP and Zelda function together as pioneer transcription factors to promote Drosophila zygotic genome activation [ChIP-Seq]

PROVIDER: PRJNA639811 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12024916_1.fastq.gz	Fastqsanger.gz
	SRR12024916_2.fastq.gz	Fastqsanger.gz
	SRR12024917_1.fastq.gz	Fastqsanger.gz
	SRR12024917_2.fastq.gz	Fastqsanger.gz
	SRR12024918_1.fastq.gz	Fastqsanger.gz

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CLAMP and Zelda function together as pioneer transcription factors to promote Drosophila zygotic genome activation [ATAC-Seq]

Project description:The pioneer transcription factor Zelda (ZLD) increases the accessibility of chromatin to promote the essential process of zygotic genome activation (ZGA) in the Drosophila early embryo. However, many genomic loci remain accessible in the absence of ZLD and are enriched for GA-rich DNA binding motifs. Therefore, we hypothesized that other pioneer TFs that function with ZLD have not yet been identified, especially those that bind to GA-rich motifs. CLAMP (Chromatin-linked adaptor for Male-specific lethal MSL proteins) is a GA-rich motif binding TF that is essential for early embryonic development. Here, we identify for the first time that CLAMP is a pioneer TF which interacts directly with nucleosomes, regulates zygotic genome activation, promotes chromatin accessibility, and facilitates the binding of ZLD to promoters. When ZLD is bound at a locus but does not regulate chromatin accessibility, CLAMP can often function redundantly to open the chromatin. Because ZGA is an essential process across metazoans, it is key to evolve redundant pioneer TFs to protect organisms from lethality that would be caused by loss of a single non-redundant factor.

2021-08-05 | GSE152596 | GEO

CLAMP and Zelda function together as pioneer transcription factors to promote Drosophila zygotic genome activation [ChIP-Seq]

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CLAMP and Zelda function together as pioneer transcription factors to promote Drosophila zygotic genome activation

Project description:CLAMP and Zelda function together as pioneer transcription factors to promote Drosophila zygotic genome activation

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CLAMP and Zelda function together as pioneer transcription factors to promote Drosophila zygotic genome activation [ATAC-Seq]

Project description:CLAMP and Zelda function together as pioneer transcription factors to promote Drosophila zygotic genome activation [ATAC-Seq]

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Catalytic-dependent and independent functions of the histone acetyltransferase CBP promote pioneer factor-mediated zygotic genome activation [ChIP-seq]

Project description:Immediately after fertilization the genome is transcriptionally quiescent. Maternally encoded pioneer transcription factors reprogram the chromatin state and facilitate the transcription of the zygotic genome. In Drosophila, transcription is initiated by the pioneer factor Zelda. While Zelda-occupied sites are enriched with histone acetylation, a post-translational mark associated with active cis-regulatory regions, the functional relationship between Zelda and histone acetylation in zygotic genome activation remained unclear. We show that Zelda-mediated recruitment of the histone acetyltransferase CBP is essential for zygotic transcription and embryonic development. CBP catalytic activity is necessary for release of RNA Polymerase II (Pol II) into transcription elongation. However, CBP largely activates zygotic transcription independent of acetylation through Pol II recruitment. Neither acetylation nor CBP are required for the pioneering function of Zelda. Our data suggest that pioneer factor-mediated recruitment of CBP is a conserved mechanism required to activate zygotic transcription but that this role is separable from the function of pioneer factors in restructuring chromatin accessibility.

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