TRAPSeq identifies transcripts enriched/de-enriched in mouse GnRH neurons.
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA432601 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:We utilized translating ribosome affinity purification (TRAP) coupled with RNA sequencing to examine mRNAs of GnRH neurons in adult intact and gonadectomized (GDX) male and female mice. TRAP produces one RNA fraction enhanced for GnRH neuron transcripts and one RNA fraction depleted. cDNA libraries were created from each fraction and 50-base, paired-end sequencing done and differential expression (enhanced fraction/depleted fraction) determined with a threshold of >1.5 or <0.66 fold (false discovery rate p≤0.05). A core of ~840 genes were differentially expressed in GnRH neurons in all treatments, including enrichment for Gnrh1 (~40 fold), and genes critical for GnRH neuron and/or gonadotrope development. In contrast, non-neuronal transcripts were not enriched or were de-enriched. Several epithelial markers were also enriched, consistent with the olfactory epithelial origins of GnRH neurons. Interestingly, many synaptic transmission pathways were de-enriched, in accordance with relatively low innervation of GnRH neurons. The most striking difference between intact and GDX mice of both sexes was a marked down regulation of genes associated with oxidative phosphorylation and upregulation of glucose transporters in GnRH neurons from GDX mice.
2018-04-18 | GSE110042 | GEO
Project description:Translating Ribosome Affinity Purification results in non specific RNA binding to the immunoprecipitation matrix, even in mice not expressing cell specific GFP labelled ribosomal protein L10a. This creates false positive enriched transcripts in our datasets. To determine which RNA transcripts bind non specifically to the immunoprecipitation matrix, preoptic area punches were collected from young and adult mice that do not express L10a-GFP. Also, included was a positive control (GnRH CRE x floxed L10a-GFP mice) to ensure that the TRAP procedure was enriching for GnRH neuron specific transcripts as previously described. Four GnRH depleted supernatant RNA samples from the previous study were also included to aid comparison of the two sequencing runs.
2020-12-02 | GSE162558 | GEO
Project description:The overall aim of the experiment is to understand the phenotype of mature mouse olfactory sensory neurons by analyzing the transcripts expressed and enriched in them as compared to the rest of the cell types in the olfactory epithelium (consisting of immature neurons, supporting cells, progenitor cells and cells in lamina propria) and brain ( with out the olfactory bulbs). Comparision with the other cell types in the olfactory epithelium should eliminate the transcripts commonly expressed in the olfactory epithelium and comparision with brain will eliminate the transcripts common to most neurons. Our gene chip data indicates that mature mouse olfactory sensory neurons express 10,000 genes. Mature OSNs specifically contained three clusters of over represented Gene ontology categories: smell, ion transport and cilia. Analysis for the functionally over represented categories among the transcripts with a positive signal in the mature OSNs yielded largely broad categories common to all cells with the exception of chromatin modelling and RNA processing categories. Biological process categories of movement, development and immune response came as under represented categories. Keywords: cell type comparison
2007-04-30 | GSE4915 | GEO
Project description:During development, gonadotropin releasing hormone (GnRH) neurons are born in the nasal placode and migrate to the hypothalamus, where they position to regulate sexual reproduction. Defective GnRH neuron development may lead to GnRH deficiency (GD) which is characterized by absent or delayed puberty. Several GD causative genes have been identified so far, but half of the cases are still idiopathic. The identification of candidate genes is also hampered by the difficulty in isolating and studying GnRH neurons, which are small in number, develop in a short developmental window and lack specific markers. Gene expression profiles of GnRH neurons are lacking, as obtaining primary GnRH neurons is challenging and no reports on gene expression profiles during the whole developmental process of GnRH neurons are available. In this work, we obtained the transcriptomic profile of sorted GFP-positive and unsorted GFP-negative cells from Gnrh1-GFP rat embryos at three developmental stages, representing the initiation (embryonic day (E)14), the peak (E17) and the completion of GnRH neuronal migration (E20).
2023-02-28 | GSE174896 | GEO
Project description:Polycystic ovary syndrome (PCOS) is the most common form of infertility in women. The causes of PCOS are not yet understood and both genetics and early-life exposure have been considered as candidates. With regard to the latter, circulating androgens are elevated in mid-late gestation in women with PCOS, potentially exposing offspring to elevated androgens in utero; daughters of women with PCOS are at increased risk for developing this disorder. Consistent with these clinical observations, prenatal androgenization (PNA) of several species recapitulates many phenotypes observed in PCOS. There is increasing evidence that symptoms associated with PCOS, including elevated luteinizing hormone (LH) (and presumably gonadotropin-releasing hormone (GnRH)) pulse frequency emerge during the pubertal transition. We utilized translating ribosomal affinity purification coupled with RNA sequencing to examine GnRH neuron mRNAs from prepubertal (3wk) and adult female control and PNA mice. Prominent in GnRH neurons were transcripts associated with protein synthesis and cellular energetics, in particular oxidative phosphorylation. The GnRH neuron transcript profile was affected more by the transition from prepuberty to adulthood than by PNA treatment, however PNA did change the developmental trajectory of GnRH neurons. This included families of transcripts related to both protein synthesis and oxidative phosphorylation, which were more prevalent in adults than in prepubertal mice but were blunted in PNA adults. These findings suggest that prenatal androgen exposure can program alterations in the translatome of GnRH neurons, providing a mechanism independent of changes in the genetic code for altered expression.
2020-10-13 | GSE155314 | GEO
Project description:Identifying the early gene program induced by GnRH would help understand how GnRH-activated signaling pathways modulate gonadotrope secretory response. We previously analyzed GnRH-induced early genes in LbT2 cells, however these lack GnRH self-potentiation, a physiological attribute of gonadotropes. To minimize cellular heterogeneity, rat primary pituitary cultures were enriched for gonadotropes by 40-60% using a sedimentation gradient. Given the limited number of gonadotropes, RNA was amplified prior to microarray analysis. Thirty-three genes were up-regulated 40 minutes after GnRH stimulation. Real-time PCR confirmed regulation of several transcripts including fosB, c-fos, egr-2 and rap1b, a small GTPase and member of the Ras family. GnRH stimulated rap1b gene expression in gonadotropes, measured by a sensitive single cell assay. Immunocytochemistry revealed increased Rap1 protein in GnRH-stimulated gonadotropes. These data establish rap1b as a novel gene rapidly induced by GnRH and a candidate to modulate gonadotropin secretion in rat gonadotropes. Primary rat gonadotrope cells were exposed to 10 nM GnRH for 40 min, then harvested and processed for RNA extraction using a Qiagen RNeasy mini kit (Qiagen, Valencia, CA). A total of 12 Affymetrix Rat Expression Array 230 v2.0, namely 6 GnRH-treated and 6 vehicle-treated samples, each containing 31,000 gene clusters, were used. Data analysis was performed by Affymetrix GeneChip Operating System (GCOS). A gene was considered to be up-regulated by GnRH if there is at least 50% concordance across multiple pairwise comparisons of GnRH- vs. vehicle-treated microarrays, and if the fold-change was at least 1.50.
2011-08-16 | E-GEOD-31399 | biostudies-arrayexpress
Project description:During embryonic development, the olfactory placode (OP) gives rise to various populations of neurons; these include putative olfactory pioneer neurons, different neurons of unknown identity and function, cells of the terminal nerve, and the Gonadotropin-releasing hormone-1 (GnRH-1) neurons. In mice, the GnRH-1 neurons are first detectable in the developing olfactory system around mid-gestation. From here, the GnRH-1 neurons migrate, along the axons of the terminal nerve (TN), to various regions of the developing brain. Once in the brain, the GnRH-1 neurons play a central role in controlling the hypothalamic-pituitary-gonadal (HPG) axis. Early migratory neurons forming from the olfactory placode have been proposed to play a vital role in inducing olfactory bulb morphogenesis. Kallmann syndrome is a condition characterized by defective development of the olfactory system and infertility. Murine studies have demonstrated the critical role of the Prokineticin 2-Prokinteicin Receptor 2 pathway in olfactory bulb morphogenesis and GnRH-1 neuronal migration. Loss-of-function Prokr2 mutations cause both Kallmann syndrome associated with bulb agenesis and normosmic idiopathic hypogonadotropic hypogonadism (nIHH). Following Prokr2 expression and lineage tracing, we found that Prokr2 is not expressed by the cells of the developing olfactory bulb but by migratory putative pioneer/terminal nerve neurons. Performing single-cell-RNA-sequencing, we identified genes enriched in the migratory cells of the putative terminal nerve. By integrating genetic lineage tracing and single-cell transcriptomics, we identified previously undescribed populations of migratory neurons that appear to be enriched in the expression of several genes related to olfactory defects, GnRH migratory deficiencies and infertility.
2024-03-11 | GSE234871 | GEO
Project description:GnRH neurons are fundamental for reproduction in all vertebrates ultimately integrating all reproductive inputs. The inaccessibility of human GnRH-neurons has been a major impediment to studying the central control of reproduction and its disorders. Here, we report the efficient generation of kisspeptin responsive GnRH-secreting neurons by directed differentiation of human Pluripotent Stem Cells. The protocol involves the generation of intermediate Neural Progenitor Cells (NPCs) through long-term Bone morphogenetic protein 4 inhibition followed by terminal specification of these NPCs in a media containing FGF8 and a NOTCH inhibition. The resulting GnRH expressing and secreting neurons display a neuroendocrine gene expression pattern and present spontaneous calcium transients that can be stimulated by kisspeptin. These in vitro generated GnRH expressing cells provide a new resource for studying the molecular mechanisms underlying the development and function of GnRH neurons.
2016-09-17 | GSE86990 | GEO
Project description:Identifying the early gene program induced by GnRH would help understand how GnRH-activated signaling pathways modulate gonadotrope secretory response. We previously analyzed GnRH-induced early genes in LbT2 cells, however these lack GnRH self-potentiation, a physiological attribute of gonadotropes. To minimize cellular heterogeneity, rat primary pituitary cultures were enriched for gonadotropes by 40-60% using a sedimentation gradient. Given the limited number of gonadotropes, RNA was amplified prior to microarray analysis. Thirty-three genes were up-regulated 40 minutes after GnRH stimulation. Real-time PCR confirmed regulation of several transcripts including fosB, c-fos, egr-2 and rap1b, a small GTPase and member of the Ras family. GnRH stimulated rap1b gene expression in gonadotropes, measured by a sensitive single cell assay. Immunocytochemistry revealed increased Rap1 protein in GnRH-stimulated gonadotropes. These data establish rap1b as a novel gene rapidly induced by GnRH and a candidate to modulate gonadotropin secretion in rat gonadotropes.
2011-08-17 | GSE31399 | GEO
Project description:Identifying the early gene program induced by GnRH would help understand how GnRH-activated signaling pathways modulate gonadotrope secretory response. We previously analyzed GnRH-induced early genes in LbT2 cells, however these lack GnRH self-potentiation, a physiological attribute of gonadotropes. To minimize cellular heterogeneity, rat primary pituitary cultures were enriched for gonadotropes by 40-60% using a sedimentation gradient. Given the limited number of gonadotropes, RNA was amplified prior to microarray analysis. Thirty-three genes were up-regulated 40 minutes after GnRH stimulation. Real-time PCR confirmed regulation of several transcripts including fosB, c-fos, egr-2 and rap1b, a small GTPase and member of the Ras family. GnRH stimulated rap1b gene expression in gonadotropes, measured by a sensitive single cell assay. Immunocytochemistry revealed increased Rap1 protein in GnRH-stimulated gonadotropes. These data establish rap1b as a novel gene rapidly induced by GnRH and a candidate to modulate gonadotropin secretion in rat gonadotropes.
2011-08-17 | GSE31399 | GEO