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Transcriptomes of E16 neocortical tissue knockout from Nfia, Nfib and Nfix knockout mice

ABSTRACT: Transcriptomes of E16 neocortical tissue knockout from Nfia, Nfib and Nfix knockout mice

PROVIDER: PRJNA513290 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8403820_1.fastq.gz	Fastqsanger.gz
	SRR8403820_2.fastq.gz	Fastqsanger.gz
	SRR8403830_1.fastq.gz	Fastqsanger.gz
	SRR8403830_2.fastq.gz	Fastqsanger.gz
	SRR8403821_1.fastq.gz	Fastqsanger.gz

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Transcriptomes of E16 neocortical tissue knockout from Nfia, Nfib and Nfix knockout mice

Project description:Here, we generated transcriptomes of microdissected neocortex of Nfix knockout and wildtype littermate embryos at embryonic day 16.

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Common regulatory targets of NFIA, NFIX and NFIB during postnatal cerebellar development

Project description:Transcriptional regulation plays a central role in controlling neural stem and progenitor cell proliferation and differentiation during neurogenesis. For instance, transcription factors from the nuclear factor I (NFI) family have been shown to co-ordinate neural stem and progenitor cell differentiation within multiple regions of the embryonic nervous system, including the neocortex, hippocampus, spinal cord and cerebellum. Knockout of individual Nfi genes culminates in similar phenotypes, suggestive of common target genes for these transcription factors. However, whether or not the NFI family regulates common suites of genes remains poorly defined. Here, we use granule neuron precursors (GNPs) of the postnatal murine cerebellum as a model system to analyse regulatory targets of three members of the NFI family: NFIA, NFIB and NFIX. By integrating transcriptomic profiling (RNA-seq) of Nfia- and Nfix-deficient GNPs with epigenomic profiling (ChIP-seq against NFIA, NFIB and NFIX, and DNase I hypersensitivity assays), we reveal that these transcription factors share a large set of potential transcriptional targets, suggestive of complementary roles for these NFI family members in promoting neural development.

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Region-specific DNA-binding properties of NFIA in the adult mouse brain

Project description:The goal of this study is to profile NFIA DNA-binding properties in the adult mouse brain. We performed chromatin immunoprecipitation of NFIA in the hippocampus and olfactory bulb of wildtype mice, and samples were subjected to sequencing. We find that NFIA preferentially binds DNA in the hippocampus but not in the olfactory bulb as evidenced by the distinct lack of NFIA binding peaks in the olfactory bulb. Mass spectrometry results suggested that NFIA has a significantly higher binding affinity for NFIB in the olfactory bulb, potentially blocking NFIA’s ability to bind DNA. Virally induced siRNAs against NFIB or scramble were injected into the olfactory bulb of adult wildtype mice to knock down NFIB. We performed chromatin immunoprecipitation of NFIA in the olfactory bulb injected with siRNA-NFIB or siRNA-scramble. Subsequent sequencing revealed an increase of NFIA binding in the olfactory bulb upon the depletion of NFIB as compared to the siRNA-scramble and wildtype controls.

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PAX6 does not regulate Nfia and Nfib expression during neocortical development.

Project description:The Nuclear factor I (NFI) family of transcription factors regulates proliferation and differentiation throughout the developing central nervous system. In the developing telencephalon of humans and mice, reduced Nfi expression is associated with agenesis of the corpus callosum and other neurodevelopmental defects. Currently, little is known about how Nfi expression is regulated during early telencephalic development. PAX6, a transcription factor important for telencephalic development, has been proposed as an upstream regulator of Nfi expression in the neocortex. Here we demonstrate that, in the developing neocortex of mice, NFIA and NFIB are endogenously expressed in gradients with high caudo-medial to low rostro-lateral expression and are most highly expressed in the cortical plate. We found that this expression pattern deviates from that of PAX6, suggesting that PAX6 does not drive Nfi expression. This is supported by in vitro reporter assays showing that PAX6 over-expression does not regulate Nfi promoter activity. Similarly, we also found that in the Pax6 Small Eye mutant, no changes in Nfi mRNA or protein expression are observed in the neocortical ventricular zone where PAX6 and the NFIs are expressed. Together these data demonstrate that in mice, PAX6 is not a transcriptional activator of Nfi expression during neocortical development.

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Project description:Since the NFI transcription factors have been shown to be key regulators of gliogenesis, we utilized this pathway to identify miRNAs involved in the regulation of the neurogenesis-to-gliogenesis switch by neural stem/progenitor cells (NSPCs). We focused on miRNAs with expression levels that were differentially regulated downstream of NFIA, and established a mouse embryonic stem cell (ESC) line that expresses NFIA in a doxycycline (Dox)-dependent manner. NFIA-overexpressing (OE) and control NSPCs (neurospheres) derived from ESCs were purified from their mixed cultures (primary neursphsres (PNs) or secondary neurospheres (SNs) ) by fluorescence activated cell sorting and subjected to miRNAarray analysis.

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NFI Transcription Factors Govern Stem Cell Chromatin Accessibility and Guard Against Irreversible Hair Loss [scRNA-seq]

Project description:Tissue homeostasis and regeneration rely upon resident stem cells (SCs), whose behavior is regulated through niche-dependent crosstalk. The mechanisms underlying SC maintenance are still unfolding. Here, using hair follicles (HFs) as model and spatiotemporal gene ablation in mice, we uncover transcription factors (TFs) NFIB and NFIX as guardians of the process. Complete NFI ablation causes SC depletion and hair loss which resembles irreversible alopecia in humans, who intriguingly also display reduced NFI. Through single cell transcriptomics, ATAC- and ChIP-seq profiling, we uncover a key role for NFIB/NFIX in governing chromatin accessibility of HFSC master TFs . When NFIB/NFIX are genetically removed, the stemness epigenetic landscape is lost, as enhancers driving HFSC identity are decommissioned and those of epidermal differentiation and wound-repair are de-repressed. Together, our findings expose NFIB/NFIX as crucial rheostats of tissue homeostasis, functioning to safeguard the SC epigenome from a breach in lineage confinement that otherwise triggers irreversible tissue degeneration.

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