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Transcriptome analysis of control and TFEB/TFE3 DKO RAW264.7 in response to DNA Damage

ABSTRACT: Transcriptome analysis of control and TFEB/TFE3 DKO RAW264.7 in response to DNA Damage

PROVIDER: PRJNA485900 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7691790_1.fastq.gz	Fastqsanger.gz
	SRR7691790_2.fastq.gz	Fastqsanger.gz
	SRR7691800_1.fastq.gz	Fastqsanger.gz
	SRR7691800_2.fastq.gz	Fastqsanger.gz
	SRR7691791_1.fastq.gz	Fastqsanger.gz

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Transcriptome analysis of control and TFEB/TFE3 DKO RAW264.7 in response to DNA Damage

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TFEB AND TFE3 DRIVE KIDNEY CYSTOGENESIS AND TUMORIGENESIS

Project description:Birt-Hogg-Dubè (BHD) syndrome is an inherited condition caused by loss-of-function mutations in the gene encoding the tumor-suppressor protein folliculin (FLCN) and frequently associated with kidney cysts and cancer. FLCN acts as a negative regulator of TFEB and TFE3 transcription factors, master controllers of lysosomal biogenesis and autophagy, by enabling their phosphorylation by the mechanistic Target Of Rapamycin Complex 1 (mTORC1). We previously showed that deletion of TFEB rescued the renal cystic phenotype of kidney-specific Flcn KO mice. Using Flcn/TFEB/TFE3 double and triple KO mice we now show that both TFEB and TFE3 contribute, in a differential and cooperative manner, to kidney cystogenesis. Importantly, silencing of either TFEB or TFE3 rescued tumorigenesis in patient-derived xenografts (PDXs) generated from a kidney tumor of a BHD patient. Furthermore, transcriptome analyses performed in transgenic mice, PDXs and patient tumor samples revealed TFEB/TFE3 downstream targets that may contribute to their tumorigenic activity. Our findings demonstrate in disease-relevant models that TFEB and TFE3 are key drivers of kidney tumorigenesis and suggest novel therapeutic strategies based on the inhibition of these transcription factors.

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Transcriptome profile of ENDOC-BH1 cells silencing TFEB and TFE3 (siTFEB/TFE3) or controls

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Transcriptional regulation of FAM134B by TFEB/TFE3 controls ER-phagy in response to starvation and chondrocyte differentiation

Project description:Lysosomal degradation of the endoplasmic reticulum (ER) via autophagy (ER-phagy) is emerging as a critical regulator of cell homeostasis and function1. The recent identification of ER-phagy receptors has shed light on the molecular mechanism underlining this process; however, the signaling pathways regulating ER-phagy in response to cellular needs are still largely unknown. We found that the nutrient responsive transcription factors TFEB and TFE3 - master regulators of lysosomal biogenesis and autophagy2- control ER-phagy by inducing the expression of the ER-phagy receptor FAM134B. The TFEB/TFE3-FAM134B axis promotes ER-phagy activation upon prolonged starvation. In addition, we discovered that this pathway is activated in chondrocytes by FGF signaling, a critical regulator of cell differentiation 3. FGF signaling induces a JNK-dependent proteasomal degradation of the insulin receptor substrate 1, which inhibits the insulin-PI3K-PKB/Akt-mTORC1 pathway and promotes TFEB/TFE3 nuclear translocation and FAM134B induction. Consistent with a role of the TFEB/TFE3-FAM134B axis in chondrocytes, FAM134B knock-down impairs cartilage growth and mineralization in medaka fish. This study identifies a new signaling pathway that allows ER-phagy to respond to both metabolic and developmental cues.

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Project description:The transcription factors TFEB and TFE3 orchestrate the cellular response to a variety of stressors, including nutrient deprivation, oxidative stress, and pathogens. Here we describe a novel interaction between TFEB/TFE3 and FACT, a heterodimeric histone chaperone consisting of SSRP1 and SPT16 that mediates nucleosome disassembly and assembly, thus facilitating transcription. Extracellular stimuli, such as nutrient deprivation or oxidative stress, induce nuclear translocation and activation of TFEB and TFE3, which then associate with the FACT complex to regulate stress-induced gene transcription. Depletion of FACT does not affect TFEB activation, stability, or binding to the promoter of target genes. In contrast, reduction of FACT levels by siRNA or treatment with the FACT inhibitor curaxin, severely impair induction of numerous antioxidant and lysosomal genes, revealing a crucial role of FACT as a regulator of cellular homeostasis. Furthermore, upregulation of antioxidant genes induced by TFEB over-expression is significantly reduced by curaxin, consistent with a role of FACT as a TFEB transcriptional activator. Together, our data show that chromatin remodeling at the promoter of stress-responsive genes by FACT is important for efficient expression of TFEB/TFE3 targets, thus providing a link between environmental changes, chromatin modifications and transcriptional regulation.

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The FACT complex facilitates expression of lysosomal and antioxidant genes through binding to TFEB and TFE3 [RNA-seq]

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The transcription factors TFEB and TFE3 link the FLCN-AMPK signaling axis to innate immune response and pathogen resistance [array]

Project description:TFEB and TFE3 are transcriptional regulators of the innate immune response, but the mechanisms regulating their activation upon pathogen infection are poorly elucidated. Using C. elegans and mammalian models, we report that the master metabolic modulator 5'-AMP-activated protein kinase (AMPK) and its negative regulator Folliculin (FLCN) act upstream of TFEB/TFE3 in the innate immune response, independently of the mTORC1 signaling pathway. In nematodes, loss of FLCN or overexpression of AMPK confers pathogen resistance via activation of TFEB/TFE3- dependent antimicrobial genes, while ablation of total AMPK activity abolishes this phenotype. Similarly, in mammalian cells, loss of FLCN or pharmacological activation of AMPK induces TFEB/TFE3-dependent pro-inflammatory cytokine expression. Importantly, a rapid reduction in cellular ATP levels in murine macrophages is observed upon lipopolysaccharide (LPS) treatment accompanied by an acute AMPK activation and TFEB nuclear localization. These results uncover an ancient, highly conserved and pharmacologically actionable mechanism coupling energy status with innate immunity.

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