Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

RNA Seq analysis of gene expression during Schmidtea mediterranea embryogenesis, including yolk and adult samples

ABSTRACT: Planarian neoblasts are pluripotent, adult somatic stem cells and lineage-primed progenitors required for the production and maintenance of all differentiated cell types, including the germline. Neoblasts, originally defined by Harriet Randolph as undifferentiated, embryonic-like cells residing in the adult parenchyma, are frequently compared to embryonic stem cells yet their developmental origin remains obscure. We investigated the provenance of neoblasts during S. mediterranea embryogenesis, and report that neoblasts arise from an anarchic, cycling piwi-1+ population that is wholly responsible for production of all temporary and definitive organs during embryogenesis. Early embryonic piwi-1+ cells are molecularly and functionally distinct from neoblasts: they express unique cohorts of early embryo enriched transcripts and the cells behave differently than neoblasts in cell transplantation assays. Neoblast lineages, established as organogenesis commences, persist into adulthood, where they act as agents of tissue homeostasis and regeneration.

ORGANISM(S): Schmidtea mediterranea

PROVIDER: GSE82280 | GEO | 2016/12/01

SECONDARY ACCESSION(S): PRJNA324545

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

RNA Seq analysis of sorted Schmidtea mediterranea X1 and Xins cells to identify factors specific to neoblasts

2015-12-17 | E-GEOD-73027 | biostudies-arrayexpress

RNA Seq analysis of sorted Schmidtea mediterranea X1 and Xins cells to identify factors specific to neoblasts

2015-12-17 | GSE73027 | GEO

Digital Gene Expression profiling of Schmidtea mediterranea stem cells.

Project description:The freshwater planarian Schmidtea mediterranea is well known by its amazing regeneration capabilities thanks to the presence of adult stem cells, the neoblasts, the only proliferative cells and responsible for the differentiation in all the cell types of the organism. This study involves the creation of separated transcript libraries from both, isolated neoblasts and differentiated cells, as well as their posterior sequencing and quantification through Digital Gene Expression (DGE) for the characterization of the neoblast transcriptome. Three DGE libraries were produced from FACS isolated cell populations X1 (proliferating stem cells, S/G2/M), X2 (a mix of proliferating stem cells and stem cell progeny, G0/G1) and Xin (differentiated cells, G0/G1). Cells were isolated from a pool of 32 regenerating animals two days after being cut off pre- and post-pharingeally to trigger regeneration and neoblast proliferation.

2015-05-07 | E-GEOD-51681 | biostudies-arrayexpress

Digital Gene Expression profiling of Schmidtea mediterranea stem cells.

2015-05-07 | GSE51681 | GEO

RNA Seq analysis of Schmidtea mediterranea treated with RNAi against chd4, p53, or unc22 to identify factors involved in neoblast differentiation.

Project description:Adult stem cells are tissue-specific cells with the capacity to self-renew and differentiate to continually replace cells lost to normal physiological turnover or injury. Neoblasts, the planarian stem cells, are widely distributed throughout the body mesenchyme, driving constitutive renewal of tissues during homeostasis and endowing planarians with the remarkable capacity to regenerate wholly from tiny tissue fragments. Neoblasts are the only dividing cells in planarians and are believed to be collectively comprised of both a heterogeneous population of pluripotent cells with broad differentiation potential and also lineage-committed progenitor cells that give rise to specific tissues. Recent work has identified a prominent class of neoblasts referred to as zeta-class, which express the zinc-finger gene zfp-1. Zfp-1, along with the chromatin remodeling factor chd4, the tumor suppressor gene p53, and most recently an RNA-binding protein mex3-1, have all been shown to be required for maintenance of two related post-mitotic, sub-epidermal cell populations expressing the specific marker genes prog-1 and AGAT-1, which have been widely used to asses neoblast differentiation. Given that zeta-class neoblasts are required for the generation of prog-1 and AGAT-1 positive cells and other markers of epidermal cell types, prog-1 and AGAT-1 likely mark two major populations of epidermal progeny cells. To understand the molecular mechanisms underlying neoblast differentiation and how they give rise to multiple cell types, we devised a strategy to identify critical factors enriched in the AGAT-1 positive cell population required for epidermal lineage progression. We performed RNA-Seq analysis of chd4 and p53 RNAi animals and characterized additional markers enriched in AGAT-1 positive and related post-mitotic cells.

2015-10-21 | GSE72389 | GEO

Transcriptome analysis reveals strain-specific and conserved stemness genes in Schmidtea mediterranea

Project description:The transcriptome of the planarian Schmidtea mediterranea is not well characterized. We have used RNA-Seq to characterize the transcriptome in both sexual and asexual strains of S. mediterranea from both untreated and irradiated animals. Moreover, we have performed RNA-Seq on RNA purified from FACS sorted neoblasts and differentiated cells. Together these studies expand our understanding of the planarian transcriptome and have identified strain-specific, neoblast-specific, and conserved transcripts. RNA-Seq was performed on RNA isolated from untreated and irradiated S. mediterranea animals from both the sexual and asexual strains, on FACS purified X1 neoblasts, X2 neoblasts, and Xins differentiated cells. One of the raw data files for GSM847465 is missing. The fasta file is provided at http://genome.vcell.uchc.edu/GenomeData02/Graveley_Lab_Public_Data/Planarian/S.mediterranea_SexNIRmRNA3.fa.gz

2012-04-24 | E-GEOD-34326 | biostudies-arrayexpress

Planarians recruit piRNAs for mRNA turnover in adult stem cells

Project description:PIWI proteins utilize small RNAs called piRNAs to silence transposable elements, thereby protecting germline integrity. In planarian flatworms, PIWI proteins are essential for regeneration, which requires adult stem cells termed neoblasts. Here, we characterize planarian piRNAs and examine the roles of PIWI proteins in neoblast biology. We find that the planarian PIWI proteins SMEDWI-2 and SMEDWI-3 cooperate to degrade active transposons via the ping-pong cycle. Unexpectedly, we discover that SMEDWI-3 plays an additional role in planarian mRNA surveillance. While SMEDWI-3 degrades numerous neoblast mRNAs in a homotypic ping-pong cycle, it is also guided to another subset of neoblast mRNAs by antisense piRNAs and binds these without degrading them. Mechanistically, the distinct activities of SMEDWI-3 are primarily dictated by the degree of complementarity between target mRNAs and antisense piRNAs. Planarian PIWI proteins thus act as both nucleases and RNA-binding proteins, enabling planarians to repurpose piRNAs for critical roles in neoblast mRNA turnover.

2019-09-04 | GSE122199 | GEO

Transcriptome analysis reveals strain-specific and conserved stemness genes in Schmidtea mediterranea

2012-04-25 | GSE34326 | GEO

Identification of TOR-responsive slow-cycling neoblasts in planarians

Project description:Epimorphic regeneration commonly relies on the activation of quiescent stem cells to drive new cell production. The planarian Schmidtea mediterranea is among the best regenerators in nature, thanks to its large population of adult stem cells, called neoblasts. While neoblasts have long been known to drive regeneration, whether a subset of neoblasts is reserved for this purpose is unknown. Here, we revisited the idea of reserved neoblasts by approaching neoblast heterogeneity from a regulatory perspective. By implementing a new fluorescence-activated cell sorting strategy in planarians, we identified a population of neoblasts defined by low transcriptional activity. These RNAlow neoblasts are relatively slow-cycling at homeostasis and undergo a morphological regeneration response characterized by cell growth at 48 hours post-amputation. At this time, RNAlow neoblasts proliferated in a TOR-dependent manner. Additionally, knockdown of the tumour suppressor Lrig-1, which is enriched in RNAlow neoblasts, resulted in RNAlow neoblast growth and hyperproliferation at homeostasis, and ultimately delayed regeneration. We propose that slow-cycling RNAlow neoblasts represent a regeneration-reserved neoblast population.

2020-12-31 | GSE157860 | GEO

Egf signaling directs neoblast repopulation by regulating asymmetric cell division in planarians

Project description:The goal of this experiment is to identify target genes of Egf signaling which regulate recovery of the neoblast population following exposure to a sublethal dose of radiation. A large population of highly proliferative stem cells (neoblasts) is required for physiological tissue homeostasis and regeneration after injury in planarians. Recent studies indicate that survival of a few neoblasts after sublethal irradiation results in the clonal expansion of the surviving stem cells and the eventual restoration of tissue homeostasis and regenerative capacity. Many genes are known to be required for the normal function of neoblasts, but the precise mechanisms regulating the population dynamics of these adult pluripotent stem cells remain largely unknown. By coupling RNAi screening and sublethal irradiation, we uncovered a central role for Epidermal Growth Factor (EGF) signaling during in vivo neoblast expansion mediated by Smed-egfr-3 (egfr-3) and its putative ligand Smed-neuregulin-7 (nrg-7). Furthermore, the EGFR-3 protein localizes asymmetrically on the cytoplasmic membrane of neoblasts and the ratio of asymmetric to symmetric cell divisions decreases significantly in egfr-3(RNAi) worms. Our results not only provide the first molecular evidence of asymmetric stem cell divisions in planarian, but also demonstrate that EGF signaling likely functions as an essential regulator of neoblast clonal expansion.

2016-08-18 | GSE84025 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

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