Astrocytes Tet1 regulates neuronal development and cognition through modulating GluA1
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PROVIDER: PRJNA688636 | ENA |
REPOSITORIES: ENA
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Project description:Astrocytes Tet1 regulates neuronal development and cognition through modulating GluA1 in mice
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Project description:Tet (Ten eleven translocation) mediated 5-hydroxymethylcytosine (5hmC) is highly enriched in the neuronal system and is involved in diverse biological processes and diseases. However, the function of 5hmC in astrocytes remains completely unknown. In the present study, we show that Tet1 deficiency alters astrocytes morphology and impairs neuronal function. Specific deletion of Tet1 in astrocytes impairs learning and memory ability of mice. Using 5hmC high-throughput DNA sequencing and RNA sequencing, we found the distribution feature of 5hmC in astrocytes and that Tet1 deficiency induces DNA hydroxymethylation regions (DhMRs) and alters gene expression. Mechanistically, we found that Tet1 deficiency leads to the abnormal Ca2+ signaling by regulating the expression of GluA1, which can be rescued by ectectopic expression of GluA1. Collectively, our findings suggest that Tet1 plays important functions by regulating astrocytes Ca2+ signaling.
2021-11-17 | GSE165370 | GEO
Project description:Using RNA sequencing, we found that Tet1 alters gene expression. Mechanistically, we found that Tet1 deficiency leads to the abnormal Ca2+ signaling by regulating the expression of GluA1, which can be rescued by ectectopic expression of GluA1. Collectively, our findings suggest that Tet1 plays important functions by regulating astrocytes Ca2+ signaling.
2021-11-17 | GSE164025 | GEO
Project description:Astrocytes, due to the proximity to neuronal lineage and capability to proliferate, are ideal starting cells to regenerate neurons. Human fetal astrocytes have been successfully converted into neuronal cells by small molecules, which offer a broader range of further applications than transcription factor-mediated neuronal reprogramming. Here we report human adult astrocytes could also be converted into neuronal cells by a different set with fewer small molecules. These induced neuronal cells exhibited typical neuronal morphologies, expressed neuronal markers, and displayed neuronal electrophysiological properties. Genome-wide RNA-sequencing analysis showed the gene expression profile of induced neuronal cells resembled that of human embryonic stem cell-differentiated neurons. When transplanted into postnatal mouse brains, these induced neuronal cells could survive in vivo. Altogether, our study provides a new strategy to directly generate transgene-free neurons from human adult astrocytes by small molecules.
2017-06-12 | GSE84826 | GEO
Project description:Fetal Growth Restriction Impairs Hippocampal Neurogenesis and Cognition via Tet1 in Offspring
| PRJNA601762 | ENA
Project description:MBD1 activates neuronal developmental genes through modulating chromatin structure during neuronal maturation
| PRJNA386939 | ENA
Project description:Reactive astrocytes play a pivotal role in the pathogenesis of neurological diseases; however, their functional phenotype and the downstream molecules by which they modify disease pathogenesis remain unclear. Here, we genetically increase P2Y1 receptor (P2Y1R) expression, which is upregulated in reactive astrocytes in several neurological diseases, in astrocytes of male mice to explore its function and the downstream molecule. This astrocyte-specific P2Y1R overexpression causes neuronal hyperexcitability by increasing both astrocytic and neuronal Ca2+ signals. We identify insulin-like growth factor-binding protein 2 (IGFBP2) as a downstream molecule of P2Y1R in astrocytes; IGFBP2 acts as an excitatory signal to cause neuronal excitation. In neurological disease models of epilepsy and stroke, reactive astrocytes upregulate P2Y1R and increase IGFBP2. The present findings identify a mechanism underlying astrocyte-driven neuronal hyperexcitability, which is likely to be shared by several neurological disorders, providing insights that might be relevant for intervention in diverse neurological disorders.
2024-05-17 | GSE242450 | GEO
Project description:FOXA1 is a FKHD family protein that translates epigenetic signatures at target enhancers to lineage-specific transcription and differentiation. Through genome-wide location analyses, here we show that FOXA1 expression and occupancy are, in turn, required for the maintenance of this epigenetic signature, namely DNA hypomethylation and histone 3 lysine 4 methylation. Mechanistically, this involves TET1, a 5-methylcytosine dioxygenase. We found that FOXA1 induces TET1 expression via direct binding at its cis-regulatory elements. Further, FOXA1 physically interacts with the TET1 protein through its CXXC domain. TET1 thus co-occupies FOXA1-dependent enhancers and mediates local DNA demethylation and concomitant histone 3 lysine 4 methylation, further potentiating FOXA1 recruitment. FOXA1 binding events were markedly reduced following TET1 depletion. Together, our results support that FOXA1 is not only a reader, but also a writer, of the epigenetic signatures at lineage-specific enhancers and that TET1 and FOXA1 form a feed-forward regulatory loop for enhancer activation. ChIP-Seq examination of FOXA1 binding sites in LNCaP cell, and epigenetic markers (5mC, 5hmC, H3K4me2) profiling upon TET1 depletion
2016-07-22 | E-GEOD-73363 | biostudies-arrayexpress
Project description:TET1, in addition its function as a DNA demethylase, plays important roles in both transcriptional repression and activation. However, the underlying mechanism how TET1 functions in transcriptional regulation remains elusive. Here, by integrative genomic and biochemical studies, we demonstrate that TET1 forms a novel chromatin modifying complex with hMOF, SIRT1, and the scaffold protein SIN3A to specifically regulate DNA repair genes by modulating H4K16 acetylation. Dynamic recomposition of this complex induced by oxidative damage, characterized as dissociation of TET1 and hMOF or increased binding of SIRT1, leads to hypoacetylation of H4K16 to repress the expression of DNA repair genes. Importantly, similar recomposition of this complex was validated in an oncogenic transformation cell line, which further endorsed that the role of this complex was involved in tumorigenesis. Our findings reveal a novel mechanism for TET1 to modulate H4K16ac by chromatin recomposition, with which TET1 regulates the expression of DNA repair genes instead of its well-known role in DNA demethylation.
2017-03-01 | GSE66395 | GEO
Project description:Fetal growth restriction (FGR) increases the risk for impaired cognitive function later in life. However, the precise mechanisms remain elusive. Using dexamethasone-induced FGR and protein restriction-influenced FGR mouse models, we observed learning and memory deficits in adult FGR offspring. FGR induces decreased hippocampal neurogenesis from the early postnatal period to adulthood by reducing the proliferation of neural stem cells (NSCs). We further found a persistent decrease of Tet1 expression in hippocampal NSCs of FGR mice. Mechanistically, Tet1 downregulation results in hypermethylation of the Dll3 and Notch1 promoters and inhibition of Notch signaling, leading to reduced NSC proliferation. Overexpression of Tet1 activates Notch signaling, offsets the decline in neurogenesis, and enhances learning and memory abilities in FGR offspring. Our data indicate that a long-term decrease in Tet1/Notch signaling in hippocampal NSCs contributes to impaired neurogenesis following FGR and could serve as potential targets for the intervention of FGR-related cognitive disorders.
2021-09-15 | GSE143816 | GEO