Gene expression analysis of TSC-tubers reveals increased expression of adhesion and inflammatory factors
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE16969 | GEO | 2010/02/02
SECONDARY ACCESSION(S): PRJNA117259
REPOSITORIES: GEO
Similar Datasets
Project description:Helianthus tuberosus L., known as the Jerusalem Artichoke, is a hexaploid plant species, adapted to low nutrient soils, that accumulates high levels of inulin in its tubers. Inulin is a fructose-based polysaccharide used either as dietary fiber or for the production of bioethanol. Key enzymes involved in inulin biosynthesis are well known. However, the gene networks underpinning tuber development and inulin accumulation in H. tuberous remain elusive. To fill this gap, we selected 6,365 ESTs from a H. tuberosus library to set up a microarray platform and record their expression across three tuber developmental stages, when rhizomes start enlarging (T0), at maximum tuber elongation rate (T3) and at tuber physiological maturity (Tm), in “VR” and “K8-HS142”clones. The former was selected as an early tuberizing, the latter as a late-tuberizing clone. We quantified inulin and starch levels, and q-RT PCR confirmed the expression of key genes accounting for inulin biosynthesis. The microarray analysis revealed that the differences in morphological and physiological traits between tubers of the two clones are genetically determined since T0 and that is relatively low the number of differentially expressed ESTs across the stages shared between the clones (93). The expression of ESTs for sucrose:sucrose 1-fructosyltransferase (1-SST) and fructan:fructan 1-fructosyltransferase (1-FFT), the two critical genes for fructans polymerization, resulted to be temporarily synchronized and mirror the progress of inulin accumulation and stretching. The expression of ESTs for starch biosynthesis was insignificant throughout the developmental stages of the clones in line with the negligible level of starch into their mature tubers, where inulin was the dominant polysaccharide. Overall, our study disclosed candidate genes underpinning the development and storage of carbohydrates in the tubers of two H. tuberosus clones. A model according to which the steady state levels of 1-SST and 1-FFT transcripts are developmentally controlled and might represent a limiting factor for inulin accumulation has been provided. Our finding may have significant repercussions for breeding clones with improved levels of inulin for food and chemical industry.
2020-01-13 | GSE132955 | GEO
Project description:Aberrant activation of the mammalian target of rapamycin (mTOR) complex 1 (mTORC1) is a common molecular event in a large variety of pathological settings, including genetic tumor syndromes, cancer, and obesity. However, the cell intrinsic consequences of mTORC1 activation remain poorly defined. Here, we identify global trancriptional changes in TSC1 and TSC2 null MEFs, which exhibit constitutive activation of mTORC1, compared to wild-type littermate control lines. A rapamycin time course is included to determine those changes that are dependent on mTORC1 signaling, revealing mTORC1 induced and repressed transcripts. In order to identify mTORC1-dependent transcriptional changes, we compared wild-type MEFs to both Tsc1-/- and Tsc2-/- MEFs following serum starvation, where mTORC1 signaling is off in wild-type cells and fully active in TSC-deficient cells. All cell lines were serum-starved for 24 h, and the Tsc1-/- and Tsc2-/- cells were treated with a time course of rapamycin prior to the isolation of mRNA for microarray analysis. Immortalized wild-type (Tsc2+/+ p53-/-), Tsc1-/- (p53+/+, 3T3-immortalized), and Tsc2-/- (p53-/-, derived from a littermate of the wild-type cell line) MEFs are the three cell lines used in this study and were derived in the laboratory of David J. Kwiatkowski (Brigham and Women's Hospital, Harvard Medical School, Boston, MA). Wild-type and null MEFs were grown to 70% confluence in 10 cm plates and were serum starved for 24 h in the presence of vehicle (DMSO) for 24 h or rapamycin (20 nM) for 2, 6, 12, or 24 h. All vehicle-treated samples (0 h time points) were plated in triplicate and all rapamycin time course samples were plated in duplicate. For each replicate, expression analysis was performed by hybridization to an Affymetrix Mouse 430_2 oligonucleotide microarray chip.
2010-07-30 | E-GEOD-21755 | biostudies-arrayexpress
Project description:DallePezze2012 - TSC-independent mTORC2
regulation
This model is described in the article:
A dynamic network model of
mTOR signaling reveals TSC-independent mTORC2 regulation.
Dalle Pezze P, Sonntag AG, Thien A,
Prentzell MT, Gödel M, Fischer S, Neumann-Haefelin E, Huber
TB, Baumeister R, Shanley DP, Thedieck K.
Sci Signal 2012 Mar; 5(217): ra25
Abstract:
The kinase mammalian target of rapamycin (mTOR) exists in
two multiprotein complexes (mTORC1 and mTORC2) and is a central
regulator of growth and metabolism. Insulin activation of
mTORC1, mediated by phosphoinositide 3-kinase (PI3K), Akt, and
the inhibitory tuberous sclerosis complex 1/2 (TSC1-TSC2),
initiates a negative feedback loop that ultimately inhibits
PI3K. We present a data-driven dynamic insulin-mTOR network
model that integrates the entire core network and used this
model to investigate the less well understood mechanisms by
which insulin regulates mTORC2. By analyzing the effects of
perturbations targeting several levels within the network in
silico and experimentally, we found that, in contrast to
current hypotheses, the TSC1-TSC2 complex was not a direct or
indirect (acting through the negative feedback loop) regulator
of mTORC2. Although mTORC2 activation required active PI3K,
this was not affected by the negative feedback loop. Therefore,
we propose an mTORC2 activation pathway through a PI3K variant
that is insensitive to the negative feedback loop that
regulates mTORC1. This putative pathway predicts that mTORC2
would be refractory to Akt, which inhibits TSC1-TSC2, and,
indeed, we found that mTORC2 was insensitive to constitutive
Akt activation in several cell types. Our results suggest that
a previously unknown network structure connects mTORC2 to its
upstream cues and clarifies which molecular connectors
contribute to mTORC2 activation.
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2024-09-02 | BIOMD0000000581 | BioModels
Project description:The tuberous sclerosis complex (TSC) family of tumor suppressors, TSC1 and TSC2, function together in an evolutionarily conserved protein complex that is a point of convergence for major cell signaling pathways that regulate mTOR complex 1 (mTORC1). Mutation or aberrant inhibition of the TSC complex is common in various human tumor syndromes and cancers. The discovery of novel therapeutic strategies to selectively target cells with functional loss of this complex is therefore of substantial clinical relevance to TSC and sporadic cancers. We developed a CRISPR-based method to generate homogenous mutant Drosophila cell lines. By combining TSC1 and TSC2 mutant cell lines with RNAi screens against all kinases and phosphatases, we identified synthetic interactions with TSC1 and TSC2. Knockdown of three candidate genes (mRNA-cap, Pitslre and CycT; orthologs of RNGTT, CDK11 and CCNT1 in humans) reduced the population growth rate of both Drosophila TSC1 and TSC2 mutant cells but not that of wild-type cells. Moreover, knockdown of all three genes displayed similar selective effects in mammalian TSC2-deficient cell lines, including human tumor-derived cells, illustrating the power of this cross species screening strategy to identify potential drug targets.
2018-10-24 | PXD002670 | Pride
Project description:Tuberous sclerosis complex (TSC), an autosomal dominant disorder caused by mutations in either TSC1 or TSC2, exhibits white matter abnormalities including CNS myelin deficits. however, underlying mechanisms are not fully understood. Here we find that, unexpectedly, constitutive activation of mTOR signaling caused by Tsc1 deletion in the oligodendrocyte lineage results in severe myelination defects and oligodendrocyte cell death. Expression profiling analysis reveals that Tsc1 ablation induces prominent endoplasmic reticulum (ER) stress responses through the PERKâeIF2α dependent signaling axis and activates Fas-JNK apoptotic pathways. Our studies suggest that TSC1-mTOR signaling acts as an important checkpoint for maintaining oligodendrocyte homeostasis. Gene expression profiling of optic nerve from P12 control and Tsc1cKO mice
2016-07-22 | E-GEOD-74893 | biostudies-arrayexpress
Project description:Tuberous Sclerosis Complex (TSC) is a rare genetic disorder that results from a mutation in the TSC1 or TSC2 genes leading to constitutive activation of the mechanistic target of rapamycin complex 1 (mTORC1). TSC is associated with autism, intellectual disability and severe epilepsy. Cortical tubers are believed to represent the neuropathological substrates of these disabling manifestations in TSC. In the presented study we used high-throughput RNA sequencing in combination with systems-based computational approaches to investigate the complexity of the TSC molecular network. Overall we detected 438 differentially expressed genes and 991 differentially expressed small non-coding RNAs in cortical tubers compared to autopsy control brain tissue. We observed increased expression of genes associated with inflammatory, innate and adaptive immune responses. In contrast, we observed a down-regulation of genes associated with neurogenesis and glutamate receptor signaling. MicroRNAs represented the largest class of over-expressed small non-coding RNA species in tubers. In particular, our analysis revealed that the miR-34 family (including miR-34a, miR-34b and miR-34c) was significantly over-expressed. Functional studies demonstrated the ability of miR-34b to modulate neurite outgrowth in mouse primary hippocampal neuronal cultures. This study provides new insights into the TSC transcriptomic network along with the identification of potential new treatment targets.
| EGAS00001002485 | EGA
Project description:Aberrant activation of the mammalian target of rapamycin (mTOR) complex 1 (mTORC1) is a common molecular event in a large variety of pathological settings, including genetic tumor syndromes, cancer, and obesity. However, the cell intrinsic consequences of mTORC1 activation remain poorly defined. Here, we identify global trancriptional changes in TSC1 and TSC2 null MEFs, which exhibit constitutive activation of mTORC1, compared to wild-type littermate control lines. A rapamycin time course is included to determine those changes that are dependent on mTORC1 signaling, revealing mTORC1 induced and repressed transcripts. In order to identify mTORC1-dependent transcriptional changes, we compared wild-type MEFs to both Tsc1-/- and Tsc2-/- MEFs following serum starvation, where mTORC1 signaling is off in wild-type cells and fully active in TSC-deficient cells. All cell lines were serum-starved for 24 h, and the Tsc1-/- and Tsc2-/- cells were treated with a time course of rapamycin prior to the isolation of mRNA for microarray analysis.
2010-07-30 | GSE21755 | GEO
Project description:<p>In this study, we characterized the genomic landscape of tuberous sclerosis complex (TSC), a rare genetic disease causing multisystem growth of benign tumors and other hamartomatous lesions. We analyzed 127 human tissues, including 111 TSC-associated samples and 16 non-TSC negative controls, using multiple genomic platforms including whole exome sequencing, targeted sequencing of known disease-causative loci (<i>TSC1</i> and <i>TSC2</i>), mRNA sequencing, high-density SNP arrays, and DNA methylation arrays.</p>
| phs001357 | dbGaP
Project description:Tuberous sclerosis complex (TSC) is a relatively common autosomal dominant disorder characterized by multiple dysplastic organ lesions and neuropsychiatric symptoms, caused by loss-of-function mutation of either TSC1 or TSC2. Target-capture full-length double-stranded cDNA sequencing using long-read sequencer Nanopore (Nanopore Long-read Target Sequencing) revealed that the various kinds of the TSC1 and TSC2 full-length transcripts and the novel intron retention transcripts of TSC2 in TSC patient. Our results indicate that the Nanopore Long-read Target Sequencing is useful for the detection of mutations and confers information on the full-length alternative splicing transcripts for the genetic diagnosis.
2023-09-04 | GSE241410 | GEO
Project description:Human Tsc1 and Tsc2 genes predispose to Tuberous Sclerosis Complex (TSC), a disorder characterized by the widespread of benign tumors. Tsc1 and Tsc2 proteins form a complex and serve as a GAP (GTP activating protein) for Rheb, a GTPase regulating a downstream kinase, mTor. The fission yeast genome contains tsc1+ and tsc2+, homologs of human Tsc1and Tsc2, respectively. In this study we analyzed gene expression profile in a genome-wide scale and found that deletion of either tsc1+ or tsc2+ affects gene induction upon nitrogen starvation. Three hours after nitrogen depletion genes encoding permeases and genes required for meiosis are less induced. Under the same condition, retrotransposons, G1-cyclin (pas1+) and a gene normally repressed by glucose (inv1+) are more induced. We also demonstrate that a mutation (cpp1-1) in a gene encoding aβ-subunit of a farnesyl transferase can suppress most of the phenotypes associated with deletion of tsc1+ or tsc2+. When a mutant of rhb1+ (homolog of human Rheb), which bypasses the requirement of protein farnesylation, was expressed, the cpp1-1 mutation could no longer suppress, indicating that deficient farnesylation of Rhb1 contributes to the suppression. Based on these results, we discuss the TSC-pathology and possible improvement in chemotherapy for TSC. Keywords: Keywards: Nitrogen starvation, Dtsc1. Dtsc2
2006-06-13 | GSE4449 | GEO