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OCA-T1 and OCA-T2 are coactivators of POU2F3 in the tuft cell lineage

ABSTRACT: OCA-T1 and OCA-T2 are coactivators of POU2F3 in the tuft cell lineage

PROVIDER: PRJNA774795 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16578500.fastq.gz	Fastqsanger.gz
	SRR16578501.fastq.gz	Fastqsanger.gz
	SRR16578502.fastq.gz	Fastqsanger.gz
	SRR16578503.fastq.gz	Fastqsanger.gz
	SRR16578504.fastq.gz	Fastqsanger.gz

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OCA-T1 and OCA-T2 are coactivators of POU2F3 in the tuft cell lineage

Project description:ChIP-Seq of C11orf53(OCA-T), COLCA2 and POU2F3(OCT11) in tuft cell lung cancer cell lines. Gene expression changes upon CRISPR knockout of different genes in tuft cell lung cancer cell lines and upon over-expression of C11orf53/POU2F3 alone or in combo in YT330 (a murine Notch high small cell lung cancer cell line)

2022-05-01 | GSE186614 | GEO

OCA-T1 and OCA-T2 are coactivators of POU2F3 in the tuft cell lineage.

Project description:Tuft cells are a rare chemosensory lineage that coordinates immune and neural responses to foreign pathogens in mucosal tissues1. Recent studies have also revealed tuft-cell-like human tumours2,3, particularly as a variant of small-cell lung cancer. Both normal and neoplastic tuft cells share a genetic requirement for the transcription factor POU2F3 (refs. 2,4), although the transcriptional mechanisms that generate this cell type are poorly understood. Here we show that binding of POU2F3 to the uncharacterized proteins C11orf53 and COLCA2 (renamed here OCA-T1/POU2AF2 and OCA-T2/POU2AF3, respectively) is critical in the tuft cell lineage. OCA-T1 and OCA-T2 are paralogues of the B-cell-specific coactivator OCA-B; all three proteins are encoded in a gene cluster and contain a conserved peptide that binds to class II POU transcription factors and a DNA octamer motif in a bivalent manner. We demonstrate that binding between POU2F3 and OCA-T1 or OCA-T2 is essential in tuft-cell-like small-cell lung cancer. Moreover, we generated OCA-T1-deficient mice, which are viable but lack tuft cells in several mucosal tissues. These findings reveal that the POU2F3-OCA-T complex is the master regulator of tuft cell identity and a molecular vulnerability of tuft-cell-like small-cell lung cancer.

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Tuft cells play a suppressive role in pancreatic injury and tumorigenesis [ChIP-seq]

Project description:We perfromed POU2F3 ChIP-seq on intestinal tuft cells

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A SWI/SNF-dependent transcriptional repression mediated by POU2AF2/C11orf53 at enhancer.

Project description:Recent studies have identified a previously uncharacterized protein C11orf53 (now named POU2AF2/OCA-T1), functions as a new co-activator of POU2F3, the master transcription factor which is critical for both normal and neoplastic tuft cell identity and viability. Here, we demonstrated that POU2AF2 functions as an “Yin-Yang” factor which mediates both transcriptional activation and repression at distal enhance elements. The proteomics study aims to identify potential interactors with POU2AF2 in different cell lines which may enable us to further understand the function of POU2AF2 in human cancer.

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POU2AF2/C11orf53 functions as a co-activator of POU2F3 by maintaining chromatin accessibility and enhancer activity

Project description:Small cell lung cancer (SCLC), accounting for around 15% of all lung cancers, often results in rapid tumor growth, early metastasis, and acquired therapeutic resistance. The POU class 2 homeobox 3 (POU2F3) is a master regulator of tuft cell identity and defines a subtype of SCLC tumors (SCLC-P subtype) that lack the expression of neuroendocrine markers. Here, we have identified a previously uncharacterized protein C11orf53, which is co-expressed with POU2F3 in both SCLC cell lines and patient samples, and defines the same SCLC subtype. C11orf53 is an essential gene for SCLC-P subtype cells’ survival based on genome wide CRISPR screen, and genetic depletion of C11orf53 or POU2F3 induces apoptosis in different SCLC-P subtype cell lines. Furthermore, our biochemical and genome-wide studies have demonstrated that C11orf53 is a novel chromatin-bound protein that occupies broad active enhancer domains and regulates gene expression at active enhancers. Mechanistically, C11orf53 directly interacts with POU2F3 at the POUs domain, and is recruited to chromatin by POU2F3. Depletion of C11orf53 dramatically reduced enhancer H3K27ac levels and chromatin accessibility, resulting a reduction of the expression of POU2F3-dependent tuft cell markers. Based on the expression pattern and molecular function, we have renamed C11orf53 as "POU Class 2 Homeobox Associating Factor 2" (POU2AF2). In summary, our study has identified a new co-activator of POU2 family transcription factors, and sheds light on the therapeutic potential of targeting POU2AF2/POU2F3 heterodimer in human SCLC.

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