BET activity plays an essential role in control of stem cell attributes in Xenopus
Ontology highlight
ABSTRACT:
ORGANISM(S): Xenopus laevis
PROVIDER: GSE221330 | GEO | 2024/06/19
REPOSITORIES: GEO
Similar Datasets
Project description:Gene expression was analysed in normally developing Xenopus laevis embryos from early blastula to early neurula stages
2009-03-01 | E-MEXP-2059 | biostudies-arrayexpress
Project description:Purpose: Study the developing neural cell fate of the D1 blastomere in the 8-cell embryo. Determine what transcripts are dependant on cell/cell signaling and which are inherit to the single cell and do not depend on the rest of the embryo. Methods: D1 blastomere was either injected with fluorescent dye or explanted away from the developing embryo. Transcript profile was taken at 7 time points: 8-cell, 16-cell, 32-cell, blastula, gastrula, early neurula, and mid/late neurula. 3 biological triplicates were taken at each time point for both the dissect and explant condition. Results: Up until blastula stage, dissect and explant transcript profiles remain fairly similar. But following this the profiles completely diverge, with the dissect tissue heading towards the neural fate while the explant samples head towards an ectoderm/epithelial fate.
2021-01-01 | GSE147621 | GEO
Project description:Retinoid signaling is important for patterning the vertebrate hindbrain and midaxial regions. We recently showed that signaling through retinoic acid receptors (RARs) is essential for anteroposterior patterning along the entire body axis. To further investigate the mechanisms through which RARs act, we employed microarray analysis to investigate the effects of modulating RAR activity on target gene expression. We identified 334 upregulated genes (92% of which were validated) including known RA responsive genes, known genes that have never been proposed as RA targets and many hypothetical and unidentified genes (n = 166). 67 validated downregulated genes were identified including known RA responsive genes and anterior marker genes. The expression patterns of selected upregulated genes (n = 45) were examined at neurula stages using whole mount in situ hybridization. We found that most of these genes were expressed in the neural tube and many were expressed in anterior tissues such as neural crest, brain, eye anlagen, and cement gland. Some were expressed in tissues such as notochord, somites, pronephros and blood islands, where retinoic acid (RA) plays established roles in organogenesis. Members of this set of newly identified RAR target genes are likely to play important roles in neural patterning and organogenesis under the control of RAR signaling pathways and their further characterization will expand our understanding of RA signaling during development. Keywords = retinoid Keywords = microarray Keywords = RAR Keywords = neurula Keywords = anteroposterior patterning Keywords = and organogenesis
2010-06-10 | E-GEOD-2295 | biostudies-arrayexpress
Project description:Retinoid signaling is important for patterning the vertebrate hindbrain and midaxial regions. We recently showed that signaling through retinoic acid receptors (RARs) is essential for anteroposterior patterning along the entire body axis. To further investigate the mechanisms through which RARs act, we employed microarray analysis to investigate the effects of modulating RAR activity on target gene expression. We identified 334 upregulated genes (92% of which were validated) including known RA responsive genes, known genes that have never been proposed as RA targets and many hypothetical and unidentified genes (n = 166). 67 validated downregulated genes were identified including known RA responsive genes and anterior marker genes. The expression patterns of selected upregulated genes (n = 45) were examined at neurula stages using whole mount in situ hybridization. We found that most of these genes were expressed in the neural tube and many were expressed in anterior tissues such as neural crest, brain, eye anlagen, and cement gland. Some were expressed in tissues such as notochord, somites, pronephros and blood islands, where retinoic acid (RA) plays established roles in organogenesis. Members of this set of newly identified RAR target genes are likely to play important roles in neural patterning and organogenesis under the control of RAR signaling pathways and their further characterization will expand our understanding of RA signaling during development. Keywords = retinoid Keywords = microarray Keywords = RAR Keywords = neurula Keywords = anteroposterior patterning Keywords = and organogenesis Keywords: repeat sample
2005-03-05 | GSE2295 | GEO
Project description:Here we report on genome-wide small RNA and transcriptome profiling of blastula, gastrula and neurula-stage Xenopus tropicalis embryos using deep sequencing. By combining bioinformatic analysis of the small RNA-seq dataset with experimental validation, we identify novel microRNAs and Piwi-interacting RNAs. We show that microRNA expression is highly dynamic and spatially localized in early embryos in contrast to Piwi-interacting RNAs, and we validate a novel microRNA prediction pipeline. We go on to identify a new class of small intronic non-coding RNAs, that we name sincRNAs. On a genome-wide scale we find that genes containing sincRNA clusters are transcriptionally repressed. Our data suggest a novel mechanism of sincRNA-mediated gene silencing in vertebrates. Examination of small RNAs and mRNA at 3 stages of Xenopus embryonic development.
2013-09-23 | E-GEOD-38605 | biostudies-arrayexpress
Project description:In the embryo, inductive cues are interpreted by competent tissues in a spatially and temporally restricted manner, and the mechanisms for the loss of responsiveness are not well understood. To test the hypothesis that loss of competence is associated with changes in chromatin accessibility, we adapted the assay for transposase-accessible chromatin with high throughput sequencing (ATAC-seq) for use in Xenopus laevis to evaluate genome-wide changes in chromatin accessibility in early and late gastrula stages. ATAC-seq was performed on presumptive ectoderm (animal caps) explanted at the blastula stage and cultured until siblings reached early (stage 10) or late (stage 12) gastrula stage. Approximately 70,000 accessible regions were identified at intergenic regions, introns, promoters, and transcription termination sites at both stages. Accessibility decreased from stage 10 to stage 12 at 279 promoters, including developmental regulators such as Foxh1, chordin, and VegT. Accessible chromatin domains overlap extensively with previously reported p300 binding sites, consistent with putative cis-regulatory modules (pCRMs), and these pCRMs are enriched for binding motifs for pluripotency factors, including Sox, Oct/Pou, and KLF binding motifs. Dorsal Wnt target gene promoters are not accessible after the loss of competence, but inhibition of histone deacetylases increases acetylation at these promoters and extends competence for dorsal gene induction by Wnt signaling. In contrast, the promoters for genes involved in mesoderm and neural crest development remain open through gastrulation, and histone deacetylase inhibition does not extend competence for mesoderm or neural crest induction. These data suggest that chromatin state regulates the loss of competence to inductive signals in a context-dependent manner.
2020-02-26 | GSE138905 | GEO
Project description:The epigenetic modifier lysine-specific histone demethylase 3a (kdm3a) is specific for demethylation of mono- and di-methylated 9th lysine of histone H3 (H3K9me1/2) and belongs to the Jumonji domain-containing group of demethylases. Kdm3a is known to play significant roles during various biological and pathophysiological processes such as spermatogenesis and metabolism, determination of sex, androgen receptor-mediated transcription, and embryonic carcinoma cell differentiation. In the current study, we evaluated the physiological functions of kdm3a during Xenopus laevis embryogenesis. Spatiotemporal expression pattern indicated maternal nature of kdm3a, exhibiting its expression from early embryonic stages until tadpole stage, however considerable high level of expression were observed during the neurula stage of Xenopus development. Depleting kdm3a using kdm3a antisense morpholino oligonucleotides induced anomalies, such as head deformities and small-sized eyes. Our whole-mount in situ hybridization results demonstrated that kdm3a knockdown is associated with defects in neural crest formation and migration. Further, reverse transcription polymerase chain reaction revealed abnormal expression of neural markers in kdm3a morphants. RNA sequencing of kdm3a morphants indicated that kdm3a is implicated in mesoderm formation, cell adhesion, and metabolic processes of embryonic development. In conclusion, we suggest that kdm3a is critical for neural development during Xenopus embryogenesis and can be targeted for treatment of developmental disorders. The further detailed investigation is required to understand the molecular mechanism involved in neural development regulation by kdm3a.
2018-11-23 | GSE117754 | GEO
Project description:We address the evolutionary origins of vertebrate pluripotency by comparing the development of neural crest and blastula stem cells using representatives from both jawed (Xenopus) and jawless (lamprey) vertebrates.
2024-06-21 | GSE205436 | GEO
Project description:Small molecule-mediated reprogramming of Xenopus blastula stem cells to a neural crest state
| PRJNA960645 | ENA
Project description:Here we report on genome-wide small RNA and transcriptome profiling of blastula, gastrula and neurula-stage Xenopus tropicalis embryos using deep sequencing. By combining bioinformatic analysis of the small RNA-seq dataset with experimental validation, we identify novel microRNAs and Piwi-interacting RNAs. We show that microRNA expression is highly dynamic and spatially localized in early embryos in contrast to Piwi-interacting RNAs, and we validate a novel microRNA prediction pipeline. We go on to identify a new class of small intronic non-coding RNAs, that we name sincRNAs. On a genome-wide scale we find that genes containing sincRNA clusters are transcriptionally repressed. Our data suggest a novel mechanism of sincRNA-mediated gene silencing in vertebrates.
2013-09-23 | GSE38605 | GEO