Drosophila CNS mitochondrial dysfunction with Ras/MAPK inhibition microarray
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ABSTRACT:
ORGANISM(S): Drosophila melanogaster
PROVIDER: GSE114054 | GEO | 2018/05/05
REPOSITORIES: GEO
Similar Datasets
Project description:Mitochondrial dysfunction causes biophysical, metabolic and signalling changes that alter homeostasis and reprogram cells. We used a Drosophila model in which TFAM is overexpressed in the nervous system with or without knock-down of the ER UPR transcription factor ATF4, to investigate the how mitochondrial dysfunction and ER stress signalling affect the transcriptome.
2019-03-14 | GSE128244 | GEO
Project description:Mitochondrial DNA (mtDNA) encodes essential components of the respiratory chain and loss of mtDNA leads to mitochondrial dysfunction and neurodegeneration. Mitochondrial transcription factor A (TFAM) is an essential component of mtDNA replication and a regulator of mitochondrial copy number in cells. Studies have shown that TFAM knockdown leads to mitochondrial dysfunction and respiratory chain deficiencies. Using gene expression analysis, we aimed to investigate the effects of mtDNA dysfunction in the CNS at the molecular level. We used microarray analysis to investigate gene expression in cases of mitochondrial dysfunction in the CNS. RNA was purified from the late third instar larval CNS from control larvae, or larvae over-expressing mitochondrial transcription factor A (TFAM) in post-mitotic neurons using the neuron specific driver nsyb-Gal4. Three replicates are included for each condition.
2013-12-20 | E-GEOD-53509 | biostudies-arrayexpress
Project description:Ageing populations pose one of the main public health crises of our time. Reprogramming gene expression by altering the activities of sequence-specific transcription factors (TF) can ameliorate deleterious effects of age. Here we explore how a circuit of TFs coordinates pro-longevity transcriptional outcomes, which reveals a multi-tissue and multi-species role for an entire protein family: the E-twenty-six (ETS) TFs. In Drosophila, reduced insulin/IGF signalling (IIS) extends lifespan by coordinating activation of Aop, an ETS transcriptional repressor, and Foxo, a Forkhead transcriptional activator. Aop and Foxo bind the same genomic loci, and we show that, individually, they effect similar transcriptional programmes in vivo. In combination, Aop can both moderate or synergise with Foxo, dependent on promoter context. Moreover, Foxo and Aop oppose the activities of Pnt, an ETS transcriptional activator, effecting a transcriptomic programme that correlates lifespan outcomes. Directly limiting Pnt extended lifespan, suggesting this is how Aop and Foxo promote longevity. The lifespan-limiting role of Pnt appears to be balanced by a requirement for metabolic regulation in young flies, in which the Aop-Pnt-Foxo circuit determines nutrient storage, and Pnt regulates lipolysis and responses to nutrient stress. Molecular functions are conserved amongst ETS TFs, suggesting others may also affect ageing. We show that Ets21C limits lifespan, functioning in the same genetic network as Foxo and IIS. Other ETS TFs appear to play roles in fly ageing in multiple contexts, since inhibiting the majority of the family in intestine, adipose or neurons extended lifespan. We expand the repertoire of lifespan-limiting ETS TFs in C. elegans, confirming their conserved function in ageing. Altogether this study reveals that roles of ETS TFs in physiology and lifespan are conserved throughout the family, both within and between species.
2019-05-31 | GSE130532 | GEO
Project description:Ageing populations pose one of the main public health crises of our time. Reprogramming gene expression by altering the activities of sequence-specific transcription factors (TF) can ameliorate deleterious effects of age. Here we explore how a circuit of TFs coordinates pro-longevity transcriptional outcomes, which reveals a multi-tissue and multi-species role for an entire protein family: the E-twenty-six (ETS) TFs. In Drosophila, reduced insulin/IGF signalling (IIS) extends lifespan by coordinating activation of Aop, an ETS transcriptional repressor, and Foxo, a Forkhead transcriptional activator. Aop and Foxo bind the same genomic loci, and we show that, individually, they effect similar transcriptional programmes in vivo. In combination, Aop can both moderate or synergise with Foxo, dependent on promoter context. Moreover, Foxo and Aop oppose the activities of Pnt, an ETS transcriptional activator, effecting a transcriptomic programme that correlates lifespan outcomes. Directly limiting Pnt extended lifespan, suggesting this is how Aop and Foxo promote longevity. The lifespan-limiting role of Pnt appears to be balanced by a requirement for metabolic regulation in young flies, in which the Aop-Pnt-Foxo circuit determines nutrient storage, and Pnt regulates lipolysis and responses to nutrient stress. Molecular functions are conserved amongst ETS TFs, suggesting others may also affect ageing. We show that Ets21C limits lifespan, functioning in the same genetic network as Foxo and IIS. Other ETS TFs appear to play roles in fly ageing in multiple contexts, since inhibiting the majority of the family in intestine, adipose or neurons extended lifespan. We expand the repertoire of lifespan-limiting ETS TFs in C. elegans, confirming their conserved function in ageing. Altogether this study reveals that roles of ETS TFs in physiology and lifespan are conserved throughout the family, both within and between species.
2019-05-31 | GSE130531 | GEO
Project description:Drosophila CNS mitochondrial dysfunction with Ras/MAPK inhibition microarray
| PRJNA463815 | ENA
Project description:Gene expression analysis of 2-month-old Ctrl and Tfam-SCKO mice. At this age mitochondrial function is disrupted in the Schwann cells of Tfam-SCKO mice ,but their nerves display only very limited pathology. Mitochondrial dysfunction is a common cause of peripheral neuropathy. Much effort has been devoted to examining the role played by neuronal/axonal mitochondria, but how mitochondrial deficits in peripheral nerve glia (Schwann cells, SCs) contribute to peripheral nerve diseases remains unclear. Here, we investigate a mouse model of peripheral neuropathy secondary to SC mitochondrial dysfunction (Tfam-SCKOs). We show that disruption of SC mitochondria activates a maladaptive integrated stress response through actions of heme-regulated inhibitor kinase (HRI), and causes a shift in lipid metabolism away from fatty acid synthesis toward oxidation. These alterations in SC lipid metabolism result in depletion of important myelin lipid components as well as in accumulation of acylcarnitines, an intermediate of fatty acid b-oxidation. Importantly, we show that acylcarnitines are released from SCs and induce axonal degeneration. A maladaptive integrated stress response as well as altered SC lipid metabolism are thus underlying pathological mechanisms in mitochondria-related peripheral neuropathies. Total RNA samples were prepared by isolating and pooling RNA from three different 2-month-old MPZ-Tfam KO and Ctrl mice. 2 replicates per genotype were used in this experiment and they were prepared entirely independently.
2013-03-13 | E-GEOD-44605 | biostudies-arrayexpress
Project description:Background & Aims Mitochondrial dysfunction and mtDNA stress-mediated inflammasome activation play critical roles in the pathogenesis of dry eye disease (DED). Mitochondrial transcription factor A (TFAM) is essential for regulating mtDNA stability and mitochondrial homeostasis. However, the mechanism underling TFAM to infuence DED progression is largely unknown. As a cytosolic DNA sensor, absent in melanoma 2 (AIM2) may contribute to the development of DED. Therefore, we aimed to explore whether the role of TFAM is associated with AIM2 inflammasome activation in DED. Methods The changes in inflammation, mitochondrial function, mtDNA homeostasis and TFAM expression were analyzed in the corneas of DED mice in vivo and in HCECs under oxidative stress in vitro. The effects of TFAM knockout on mtDNA homeostasis, mitochondrial respiration and cytokine release were also investigated in HCECs. The mechanism was analyzed by RNA sequencing in the corneas of DED mice, which was further verified by the HCECs with TFAM depletion. Results We found that the corneas of DED mice and HCECs under oxidative stress exhibited inflammation, mitochondrial damage and mtDNA maintenance disruption , which were highly associated with significantly reduced TFAM protein levels. Furthermore, we demonstrated that silencing of TFAM in HCECs suppressed mitochondrial respiratory capacity, induced mtDNA released into the cytosol and triggered cytokine release. Mechanistically, cytosolic mtDNA accumulation caused by TFAM depletion activated the AIM2 inflammasome and facilitated inflammation, thereby driving DED progression. Conclusions Our findings elucidate that TFAM deficiency induces mitochondrial dysfunction and cytosolic mtDNA stress, which subsequently activates the AIM2 inflammasome, triggers inflammatory responses and promotes DED progression. TFAM pathway may provide a novel therapeutic strategy for DED.
2024-06-18 | GSE252984 | GEO
Project description:The goal of this analysis was to utilize microarray profiling to identify basal alterations in gene expression in response to TFAM depletion and mtDNA stress. Mitochondrial DNA (mtDNA) is normally present at thousands of copies per cell and is packaged into several hundred higher-order structures termed nucleoids. The abundant mtDNA-binding protein, TFAM (transcription factor A,mitochondrial), regulates nucleoid architecture, abundance and segregation. Complete mtDNA depletion profoundly impairs oxidative phosphorylation, triggering calcium-dependent stress signalling and adaptive metabolic responses. However, the cellular responses to mtDNA instability, a physiologically relevant stress observed in many human diseases and ageing, remain poorly defined. Here we show that moderate mtDNA stress elicited by TFAM deficiency engages cytosolic antiviral signalling to enhance the expression of a subset of interferon-stimulated genes. Mechanistically, we find that aberrant mtDNA packaging promotes escape of mtDNA into the cytosol, where it engages the DNA sensor cGAS (also known as MB21D1) and promotes STING (also known as TMEM173)–IRF3-dependent signalling to elevate interferon-stimulated gene expression, potentiate type I interferon responses and confer broad viral resistance. Furthermore, we demonstrate that herpesviruses induce mtDNA stress, which enhances antiviral signalling and type I interferon responses during infection. Our results further demonstrate that mitochondria are central participants in innate immunity, identify mtDNA stress as a cell-intrinsic trigger of antiviral signaling and suggest that cellular monitoring of mtDNA homeostasis cooperates with canonical virus sensing mechanisms to fully engage antiviral innate immunity. Murine embryonic fibroblasts were isolated from wild-type or Tfam+/- E13.5 littermate embryos. RNA from passage-matched wild-type and Tfam+/- MEF lines was extracted in duplicate and hybridized onto Affymetrix microarrays. Four arrays were performed in total with two technical replicates per genotype.
2015-01-26 | E-GEOD-63767 | biostudies-arrayexpress
Project description:Mitochondrial DNA (mtDNA) encodes essential components of the respiratory chain and loss of mtDNA leads to mitochondrial dysfunction and neurodegeneration. Mitochondrial transcription factor A (TFAM) is an essential component of mtDNA replication and a regulator of mitochondrial copy number in cells. Studies have shown that TFAM knockdown leads to mitochondrial dysfunction and respiratory chain deficiencies. ATP synthase is Complex V of the mitochondrial respiratory chain. It is driven by a proton gradient between the intermembrane space and the mitochondrial matrix and generates the majority of cellular ATP. The knockdown of coupling factor 6 (Cf6), one of the components of the proton channel F0, causes dysfunction in the complex, leading to mitochondrial dysfunction and respiratory chain deficiencies. Using gene expression analysis, we aimed to investigate the effects of mtDNA dysfunction in the CNS at the molecular level.
2013-12-20 | GSE53509 | GEO
Project description:Osteoblasts require substantial amounts of energy to synthesize bone matrix and coordinate the mineralization of the skeleton. This study analyzed the effect of mitochondrial dysfunction on bone formation in mouse limbs. The limb mesenchyme-specific Tfam knockout (Tfamf/f;Prx1-Cre: Tfam-cKO) mice were analyzed morphologically, and histologically and gene expression in the limb bones were assessed by in situ hybridization, quantitative real-time PCR and RNA sequencing. Moreover, we analyzed mitochondrial function of osteoblasts in Tfam-cKO mice by mitochondrial membrane potential assay and transmission electron microscopic (TEM) observations. We investigated the pathogenesis of spontaneous bone fractures by immunohistochemical analysis, TEM observations and biomechanical examination. The forelimbs in Tfam-cKO mice were significantly shortened from birth and occurred spontaneous fractures within the first week after birth, resulting in severe limb deformities. Histologically, bone hypoplasia with decrease of matrix mineralization was apparent, and the expressions of type Ⅰ collagen and osteocalcin were decreased in the osteoblasts of Tfam-cKO mice although Runx2 expression was unchanged. Decreased type Ⅰ collagen deposition and mineralization in the matrix of the limb bones in Tfam-cKO mice was associated with marked mitochondrial dysfunction. Biomechanical analysis showed significantly lower Young’s modulus and hardness due to poor apatite orientation in the bone tissue of Tfam-cKO mice. The mice with limb mesenchyme-specific Tfam deletion exhibited spontaneous limb bone fractures, resulting in severe limb deformities. Their bone fragility was caused by poor apatite orientation due to impaired osteoblasts differentiation and maturation.
2023-03-24 | GSE196628 | GEO