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Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [ChIP-seq]

ABSTRACT: Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [ChIP-seq]

PROVIDER: PRJNA1037508 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26779815_1.fastq.gz	Fastqsanger.gz
	SRR26779815_2.fastq.gz	Fastqsanger.gz
	SRR26779816_1.fastq.gz	Fastqsanger.gz
	SRR26779816_2.fastq.gz	Fastqsanger.gz
	SRR26779817_1.fastq.gz	Fastqsanger.gz

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Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [ChIP-seq]

Project description:Pioneer factors (PFs) are a subset of transcription factors (TFs) that can bind to nucleosomal DNA and invade closed chromatin. Despite that nucleosomes do not present a strong barrier to PF binding, PF can only bind to a small fraction of motifs in the genome. The underlying mechanism of such binding selectivity is not well understood. Here, we design a high-throughput assay named Chromatin Immunoprecipitation over Integrated Synthetic Oligonucleotides (ChIP-ISO) to systematically dissect the sequence features affecting the binding specificity of a classic PF, FOXA1, in A549 human lung carcinoma cells. This method involves integrating thousands of synthetic sequences containing FOXA1 motifs into a fixed genomic locus, followed by FOXA1 chromatin immunoprecipitation (ChIP) and amplicon sequencing. We find that 1) FOXA1 binding is affected by motif strength and co-binding TFs AP-1 and CEBPB, with AP-1 playing a major role in promoting FOXA1 binding, 2) FOXA1 binding in vivo and in vitro are poorly correlated, and FOXA1 and AP-1 show binding cooperativity in vitro, 3) FoxA1’s binding specificity is mostly determined by the local sequences, whereas chromatin context, including heterochromatin marks, only plays a minor role, and 4) AP-1 is at least partially responsible for differential binding of FOXA1 in different cell types. Finally, neural network analysis shows that AP-1 and CEBPB motifs are predictive of FOXA1 ChIP-seq peaks in A549, but not in some other cell types. In summary, combining ChIP-ISO with in vitro and in silico analyses, our study provides insights into the genetic rules underlying PF binding specificity and reveals a mechanism for its regulation during cell differentiation.

2023-11-09 | GSE247412 | GEO

Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [ChIP-ISO]

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Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [RNA-seq]

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Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [EMSA-seq]

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Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1

Project description:Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1

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Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [EMSA-seq]

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Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [ChIP-ISO]

Project description:Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [ChIP-ISO]

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Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [RNA-seq]

Project description:Systematic Dissection of Sequence Features Affecting the Binding Specificity of a Pioneer Factor Reveals Binding Synergy Between FOXA1 and AP-1 [RNA-seq]

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Pioneer factor FOXA1 defines GATA2- and AR-mediated transcriptional program in prostate cancer [ChIP-Seq]

Project description:AR is tightly regulated by many transcriptional cofactors, including key pioneer factor such as FOXA1 and GATA2. While FOXA1 was recently shown to be able to redistribute AR across the genome, how GATA2 regulates AR cistrome has not been carefully investigated. Here, we report that, unlike FOXA1, GATA2 is unable to reprogram AR, but instead it enhances AR program by inducing AR expression and augmenting AR co-occupancy, thereby acting as a pure AR coactivator, rather than a pioneer factor. On the other hand, AR co-occupancy enhances both GATA2 and FOXA1 binding on the chromatin, forming a positive feedback loop. Importantly, we found that FOXA1 is also capable of reprogramming GATA2 by recruiting GATA2 from GATA motif to FKHD-containing regions, being analogous to its pioneering effect on AR signaling. By contrast, GATA2 simply acts as a co-activator of FOXA1 with a lack of pioneering ability. ChIP_Seq examination of AR, FoxA1 and GATA2 binding sites in LNCaP and DU145 cells

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