Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Ago-1 and TRIM32-bound small RNAs from E14.5 mouse brain.

ABSTRACT: In the mouse neocortex, neural progenitor cells generate neurons through repeated rounds of asymmetric cell division. How distinct fates are established in their daughter cells is unclear. We show here that the TRIM-NHL protein TRIM32 segregates asymmetrically during progenitor division and induces neuronal differentiation in one of the two daughter cells. TRIM32 is highly expressed in differentiating neurons. In both horizontally and vertically dividing progenitor cells, TRIM32 distribution becomes polarized in mitosis so that the protein is enriched in one of the two daughter cells. While TRIM32 overexpression induces cell cycle exit and neuronal differentiation, TRIM32 RNAi causes both daughter cells to proliferate and prevents the initiation of a neuronal differentiation program . TRIM32 ubiquitinates and degrades the transcription factor c-Myc but also binds Argonaute-1 and thereby increases the activity of specific micro-RNAs. We show that Let-7 is one of the TRIM32 targets and is required and sufficient for neuronal differentiation. Our data suggest that the asymmetric segregation of a micro RNA regulator controls self renewal in the mammalian brain.

ORGANISM(S): Mus musculus

PROVIDER: GSE12633 | GEO | 2009/03/10

SECONDARY ACCESSION(S): PRJNA112809

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Similar Datasets

Chip-Seq of mouse Ago-1 and TRIM32-bound small RNAs from E14.5 brain.

Project description:In the mouse neocortex, neural progenitor cells generate neurons through repeated rounds of asymmetric cell division. How distinct fates are established in their daughter cells is unclear. We show here that the TRIM-NHL protein TRIM32 segregates asymmetrically during progenitor division and induces neuronal differentiation in one of the two daughter cells. TRIM32 is highly expressed in differentiating neurons. In both horizontally and vertically dividing progenitor cells, TRIM32 distribution becomes polarized in mitosis so that the protein is enriched in one of the two daughter cells. While TRIM32 overexpression induces cell cycle exit and neuronal differentiation, TRIM32 RNAi causes both daughter cells to proliferate and prevents the initiation of a neuronal differentiation program . TRIM32 ubiquitinates and degrades the transcription factor c-Myc but also binds Argonaute-1 and thereby increases the activity of specific micro-RNAs. We show that Let-7 is one of the TRIM32 targets and is required and sufficient for neuronal differentiation. Our data suggest that the asymmetric segregation of a micro RNA regulator controls self renewal in the mammalian brain. Experiment Overall Design: small RNA from total mouse brain, Ago-1 and TRIM32 IPs were cloned and sequenced using 454 GS FLX system.

2009-08-29 | E-GEOD-12633 | biostudies-arrayexpress

Asymmetric cancer cell division regulated by AKT, Reactive Oxygen Species (ROS) high versus ROS low mRNA

Project description:Human tumors often contain slowly proliferating cancer cells that resist treatment but we do not know precisely how these cells arise. We show that rapidly proliferating cancer cells can divide asymmetrically to produce slowly proliferating “G0-like” progeny that are enriched following chemotherapy in breast cancer patients. Asymmetric cancer cell division results from asymmetric suppression of AKT/PKB kinase signaling in one daughter cell during telophase of mitosis. Moreover, inhibition of AKT signaling with small molecule drugs can induce asymmetric cancer cell division and the production of slow proliferators. Cancer cells therefore appear to continuously flux between symmetric and asymmetric division depending on the precise state of their AKT signaling network. This model may have significant implications for understanding how tumors grow, evade treatment, and recur. 3 replicates each of MCF7 Reactive Oxygen Species (ROS) high, HCT116 ROS high, MCF7 ROS low, and HCT116 ROS low.

2011-07-14 | E-GEOD-30465 | biostudies-arrayexpress

Asymmetric cancer cell division regulated by AKT, Reactive Oxygen Species (ROS) high versus ROS low mRNA

2011-07-15 | GSE30465 | GEO

Gene expression of CD8 T cell progenies generated via asymmetric cell division

Project description:Asymmetric partitioning of fate-determinants is a mechanism that contributes to T cell differentiation. However, it remained unclear whether the ability of T cells to divide asymmetrically is influenced by their differentiation state, as well as if enforcing asymmetric cell division rates would have an impact on T cell differentiation and memory formation. Using the murine LCMV infection model, we established a correlation between cell stemness and the ability of CD8+ T cells to undergo asymmetric cell division (ACD). Transient mTOR inhibition proved to increase ACD rates in naïve and memory cells, and to install this ability in exhausted CD8+ T cells. Functionally, enforced ACD correlated with increased memory potential, leading to more efficient recall response and viral control upon acute or chronic LCMV infection. Moreover, transient mTOR inhibition also increased ACD rates in human CD8+ T cells. Transcriptional profiling of first daughter cells, obtained by sorting CD8lo and CD8hi cells after in vitro stimulation, revealed that progenies emerging from enforced ACD exhibited more pronounced early memory signatures, which functionally endowed these cells with strengthened memory features.

2019-02-14 | E-MTAB-7651 | biostudies-arrayexpress

Distinct Self-renewal and Differentiation Phases in the Niche of Infrequently Dividing Hair Follicle Stem Cells

Project description:In homeostasis of adult vertebrate tissues, stem cells are thought to self-renew by infrequent and asymmetric divisions that generate another stem cell daughter and a progenitor daughter cell committed to differentiate. This model is based largely on in vivo invertebrate or in vitro mammal studies. Here we examine the dynamic behaviour of adult hair follicle stem cells in their normal setting by employing mice with repressible H2B-GFP expression to track cell divisions and Cre inducible mice to perform long-term single cell lineage tracing. We provide direct evidence for the infrequent stem cell division model in intact tissue. Moreover, we find that differentiation of progenitor cells occurs at different times and tissue locations than self-renewal of stem cells. Distinct fates of differentiation or self-renewal are assigned to individual cells in a temporal-spatial manner. We propose that large clusters of tissue stem cells behave as populations, whose maintenance involves unidirectional daughter-cell fate decisions. We used microarrays to expression profile the stem cell progeny generated at distinct differentiation and self-renewal stages.

2009-08-07 | GSE16516 | GEO

KIF20A/MKLP2 regulates the division modes of neural progenitor cells during cortical development

Project description:Balanced symmetric and asymmetric divisions of neural progenitor cells (NPCs) are crucial for orderly progression of brain development, but the underlying mechanisms are not fully understood. Here, we report that mitotic kinesin KIF20A/MKLP2 interacts with RGS3 and plays a crucial role in controlling the division modes of NPCs during the mouse cortical neurogenesis. KIF20A is selectively expressed by daughter progenitors in NPC divisions. Knockdown of KIF20A causes dislocation of RGS3 from the intercellular bridge (ICB) of dividing NPCs, impairs the function of EphrinB-RGS cell fate signaling complex, and leads to a transition in NPCs from proliferative to differentiative divisions. Germ-line and inducible knockout of KIF20A causes a loss of progenitor cells and neurons and results in thinner cortex and ventriculomegaly. Interestingly, loss-of-function of KIF20A induces early cell cycle exit and precocious neuronal differentiation without causing substantial multinucleation or apoptosis in mutant NPCs. Our results thus uncover a novel RGS-KIF20A axis in regulation of cell division mode and suggest a potential link of cytokinesis control within the ICB to regulation of cell fate determination.

2018-05-14 | GSE108624 | GEO

APT1 regulates the asymmetric partitioning of Notch and Wnt signaling during cell division

Project description:Asymmetric cell division results in two distinctly fated daughter cells to generate cellular diversity. A major molecular hallmark of an asymmetric division is the unequal partitioning of cell-fate determinant proteins. We have previously established that growth factor signaling promotes protein depalmitoylation to foster polarized protein localization, which in turns drives migration and metastasis. Here, we report protein palmitoylation as a key mechanism for the asymmetric partitioning of the cell-fate determinants Numb (Notch antagonist) and β-catenin (canonical Wnt regulator) through the activity of a depalmitoylating enzyme, APT1. Using point mutants, we show specific palmitoylated residues on proteins, such as Numb, are required for asymmetric localization. Furthermore, by live-cell imaging, we show that reciprocal interactions between APT1 and CDC42 regulate the asymmetric localization of Numb and β-catenin to the plasma membrane. This in turn restricts Notch and Wnt transcriptional activity to one daughter cell. Moreover, we show altering APT1 expression changes the transcriptional signatures to those resembling that of Notch and β-catenin in MDA-MB-231 cells. We also show loss of APT1 depletes the population of CD44+/CD24lo/ALDH+ tumorigenic cells in colony formation assays. Together, the findings of this study demonstrate that palmitoylation, via APT1, is a major mechanism of asymmetric cell division regulating Notch and Wnt-associated protein dynamics, gene expression, and cellular functions.

2018-05-09 | GSE105486 | GEO

Joint single-cell multiomic analysis identifies Aebp2 as a key regulator in Wnt3a induced asymmetric stem cell division

Project description:Wnt signal usually functions as a spatial gradient. A localized Wnt3a can induce asymmetric division of mouse embryonic stem cells, whereas proximal daughter cells maintain self-renew and distal daughter cells acquire hallmarks of differentiation. Here, we develop an approach, SET-seq (same cell epigenome and transcriptome sequencing), to jointly profile epigenome and transcriptome in the same single cell. By utilizing SET-seq, we profile H3K27me3 and H3K4me3 with gene expression in Wnt3a induced asymmetric cell division. H3K27me3, but not H3K4me3, is correlatedly changed with gene expression. Single cells clustered by H3K27me3 recapitulate the clusters defined by gene expression. Furthermore, Aebp2, which is the regulator of H3K27me3, is important for the cell-fate decision with localized Wnt signal. Our results provide a convenient way to jointly profile epigenome and transcriptome in the same cell, and uncover the mechanistic insights into the gene regulatory programs for maintaining and resetting stem cell fate during differentiation.

2021-09-05 | GSE168637 | GEO

poly-A RNA profiling of Drosophila neural stem cells and tumor cells reveals genes involved in brain tumorigenesis.

Project description:Acquisition of unlimited proliferation potential is a critical hallmark of tumor cells. Drosophila neural stem cells called neuroblasts asymmetrically segregate protein determinants such as Brat into one of their two daughter cells to prevent self-renewal and induce neuronal differentiation. Mutations in these fate determinants or defects in their asymmetric segregation result in a fate reversion of the differentiating daughter cells into proliferative ectopic neuroblasts, so-called tumor neuroblasts. Over time, these events result in the formation of large brain tumors that can be maintained indefinitely by transplantation into another fly host. Our transcriptome analysis identifies genes deregulated in these over-proliferative tumor brain cells.

2018-03-04 | GSE87085 | GEO

Aging alters the epigenetic asymmetry of HSC division [scATAC-Seq]

Project description:Hematopoietic stem cells (HSCs) balance self-renewal and differentiation to maintain homeostasis. With aging, the frequency of polar HSCs decreases. Cell polarity in HSCs is controlled by the activity of the small RhoGTPase Cdc42. Here we demonstrate, using a comprehensive set of paired daughter cell analyses that include single cell 3D-confocal imaging, single cell transplants, single cell RNA-seq as well as single cell ATAC-seq, that the outcome of HSC divisions is strongly linked to the polarity status before mitosis, which is in turn determined by the level of the activity Cdc42 in stem cells. Aged apolar HSCs undergo preferentially self-renewing symmetric divisions, resulting in daughter stem cells with reduced regenerative capacity and lymphoid potential, while young polar HSCs undergo preferentially asymmetric divisions. Mathematical modeling in combination with experimental data implies a mechanistic role of the asymmetric sorting of Cdc42 in determining the potential of daughter cells via epigenetic mechanisms. Therefore, molecules that control HSC polarity might serve as modulators of the mode of stem cell division regulating the potential of daughter cells.

2018-12-04 | GSE116707 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data