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POU4F3 Pioneer Activity Enables ATOH1 to Drive Diverse Mechanoreceptor Differentiation Through a Feed-Forward Epigenetic Mechanism

ABSTRACT: POU4F3 Pioneer Activity Enables ATOH1 to Drive Diverse Mechanoreceptor Differentiation Through a Feed-Forward Epigenetic Mechanism

PROVIDER: PRJNA631963 | ENA |

REPOSITORIES: ENA

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POU4F3 Pioneer Activity Enables ATOH1 to Drive Diverse Mechanoreceptor Differentiation Through a Feed-Forward Epigenetic Mechanism

Project description:During embryonic development, hierarchical cascades of transcription factors interact with lineage specific chromatin structures to control the sequential steps in the differentiation of specialized cell types. While examples of transcription factor cascades have been well documented, the mechanisms underlying developmental changes in accessibility of cell type-specific enhancers remain poorly understood. Here we show that the transcriptional ‘master regulator’, ATOH1 – which is necessary for the differentiation of two distinct mechanoreceptor cell types, hair cells in the inner ear, and Merkel cells of the epidermis – is unable to access much of its target enhancer network in the progenitor populations of either cell type when it first appears, imposing a block to further differentiation. This block is overcome by a feed-forward mechanism in which ATOH1 first stimulates expression of POU4F3, which subsequently acts as a pioneer factor to provide access to closed ATOH1 enhancers, allowing hair cell and Merkel cell differentiation to proceed. Our analysis also indicates the presence of both shared and divergent ATOH1/POU4F3-dependent, enhancer networks in hair cells and Merkel cells. These cells share a deep developmental lineage relationship, deriving from their common epidermal origin, and suggesting that this feed-forward mechanism preceded the evolutionary divergence of these very different mechanoreceptive cell types.

2021-07-09 | GSE150391 | GEO

POU4F3 pioneer activity enables ATOH1 to drive diverse mechanoreceptor differentiation through a feed-forward epigenetic mechanism.

Project description: Not available

| S-EPMC8307294 | biostudies-literature

Using Mouse Embryonic Fibroblast to test the pioneer factor activity of POU4F3

Project description:Previous unbiased screening for the nucleosome binding affinity of transcription factors predicts that POU domain transcription factors have strong nucleosome binding potential. Here using reprogramming strategy we found that POU4F3 has pioneer factor activity at ATOH1 target elements that require POU4F3 for their accessibility.

2021-07-09 | GSE150279 | GEO

ATACseq, CutnRun and RNAseq data from Merkel cell and Touch dome epithelial progenitor cells, from wild type and Pou4f3-mutant epidermis

Project description:The role of POU4F3 in Merkel cell maturation, but not induction, is similar to its role in hair cells. This prompted us to investigate whether POU4F3 also regulates the accessibility of ATOH1 targets in a feed-forward manner during the maturation of Merkel cells. Our results suggest that, just as in hair cells, the pioneer factor activity of POU4F3 is also required for ATOH1 to correctly coordinate mechanosensory differentiation in Merkel cells.

2021-07-09 | GSE150388 | GEO

ATACseq, CutnRun and RNAseq data from sensory progenitors and hair cells, from wild type and Pou4f3-mutant cochlea

Project description:Hearing and balance are mediated in vertebrates by inner ear mechanosensory hair cells. Hair cell development, maturation and survival require POU4F3, a class IV POU domain transcription factor that is expressed in hair cells shortly after they start to differentiate. Here, we show that POU4F3 has pioneer factor activity, and is necessary to promote chromatin accessibility at approximately half of the distal regulatory elements that appear as hair cells differentiate. Pou4f3 expression in the inner ear is initiated by ATOH1, a bHLH transcription factor that is also necessary for hair cell differentiation and survival. We show that ATOH1 also binds a large number of POU4F3-dependent distal regulatory elements, suggesting a synergistic feed-forward model in which ATOH1 induces POU4F3, which then acts to promote ATOH1-dependent hair cell differentiation.

2021-07-09 | GSE150386 | GEO

Analyses of the Atoh1, Pou4f3 and Gfi1 genome binding profile during hair cell and neuronal differentiation

Project description:To gain new insights into the genetic networks regulating hair cell development, we developed a new transcriptional programming strategy to promote in vitro hair cell differentiation, starting from mouse embryonic stem cells (mESCs). In vivo, Atoh1 is the only transcription factor (TF) known to be necessary and sufficient for HC differentiation, but in vitro its overexpression induces neuronal rather than hair cell differentiation. We discovered that Atoh1 expression combined with two other TFs (Pou4f3, Gfi1) resulted in efficient hair cell generation. This work offers a new paradigm to understand the molecular mechanisms governing transcription factor specificity. For example, how do Pou4f3-Gfi1 modulate Atoh1 activity to orchestrate a HC differentiation program? To address this question, we have engineered several mESCs lines containing Atoh1, Gfi1 and/or Pou4f3 in a doxycycline-inducible locus to allow a controllable overexpression of every combination of these 3 transcriptional factors either using a polycistronic approach (mESCs lines: iG+A, iG+P, iP+A and iGPA) or by promoting their individual overexpression (mESCs lines: iAtoh1, iGfi1 and iPou4f3). These findings highlight the diversity of mechanisms by which one TF can redirect the activity of another to enable combinatorial control of cell identity.

2022-08-10 | GSE136836 | GEO

Analyses of the individual and combinatorial transcriptional effects mediated by Atoh1, Pou4f3 and Gfi1 overexpression during embryoid body differentiation in vitro

2022-08-10 | GSE136837 | GEO

Using Mouse Embryonic Fibroblast to test the pioneer factor activity of POU4F3

Project description:Using Mouse Embryonic Fibroblast to test the pioneer factor activity of POU4F3

| PRJNA631704 | ENA

Expression of Atoh1, Gfi1, and Pou4f3 in the mature cochlea reprograms non-sensory cells into hair cells

Project description:Mechanosensory hair cells of the mature mammalian organ of Corti do not regenerate, and loss of hair cells leads to permanent hearing loss. Although non-mammalian vertebrates are able to regenerate hair cells by the division and transdifferentiation of adjacent supporting cells, many humans with severe hearing loss completely lack hair cells and supporting cells, with the organ of Corti being replaced by a flat epithelium of non-sensory cells To determine if mature non-sensory cells can produce hair cells in vivo, we reprogrammed non-sensory cells of the mature cochlea with three hair cell transcription factors, Gfi1, Atoh1, and Pou4f3. We were able to generate significant numbers of hair cell-like cells in the non-sensory inner and outer sulci of the cochlea after 2 weeks of reprogramming. New hair cells continued to be added to the non-sensory regions of the cochlea over the next seven weeks, and expressed hair cell proteins such as Myosin VIIa, parvalbumin, and prestin and formed stereociliary hair bundles. We confirmed the identity of these cells by high depth single cell RNA-seq. Significantly, cells adjacent to converted hair cells expressed markers of supporting cells, suggesting that transcription factor reprogramming of non-sensory tissue in the adult animal can generate mosaics of sensory cells similar to those seen in the organ of Corti. Generating such sensory mosaics by reprogramming may represent a potential strategy for hearing restoration in humans.

2024-01-03 | GSE224627 | GEO

scRNA-seq TF-driven forward programmed hiPSCs to multiple fates

Project description:This dataset consists of single-cell RNA-seq (Smart-seq2) data from 95 forward programmed cells derived from human induced pluripotent stem cells (hiPSCs). Cells conditionally expressing either ATOH1, ETV2 or NKX3-1 under the control of a tetracycline-response element (Tet-ON system) were co-cultured on Matrigel in 2 dimensions. Data was used to explore the forward-programming potential of these transcription factors (TFs) when cell lines with the capacity to differentiate in isolation are cultured together.

2020-07-21 | GSE154759 | GEO

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