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Gene Expression in Mutant P0 Cre Dicer Mouse Sciatic Nerves

ABSTRACT: The hypothesis is that genes involved in the immature schwann cell and promyelinating state will be upregulated and genes that are involved in the myelnating state will be down regulated.

ORGANISM(S): Mus musculus

PROVIDER: GSE16741 | GEO | 2010/06/04

SECONDARY ACCESSION(S): PRJNA117437

REPOSITORIES: GEO

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Gene Expression in Mutant P0 Cre Dicer Mouse Sciatic Nerves

Project description:The hypothesis is that genes involved in the immature schwann cell and promyelinating state will be upregulated and genes that are involved in the myelnating state will be down regulated. Bioconductor limma package [1,2,3,4] was used to preprocess 6 samples from mouse tissue-cultured cells, which are hybridized to Mouse WG-6 version 2 Illumina Array. To remove batch effects, the complete dataset were normalized by RMA. Before doing statistical analysis, we filter the probe-sets by present/absent calls using the Wilcoxon signed rank-based algorithm. 18,420 genes out of 45,281 genes were kept and the remaining ones were removed as âAbsentâ to reduce false positive rate. We identified differentially expressed gene list by fitting linear models to the normalized expression values. The empirical Bayes shrinkage was applied to t-statistics using the limma package in Bioconductor. In general, selected genes have greater than 2.0 fold-change and less than 0.05 fdr adjusted p-value.

2010-06-16 | E-GEOD-16741 | biostudies-arrayexpress

Expression data of sciatic nerves from mice with Schwann-cell specific Sip1 deletion compared to control mice.

Project description:Schwann cell maturation is tightly controlled by a set of transcriptional regulators. We have deleted the zinc-finger transcription factor Sip1 specifically from immature Schwann cells and observed a dramatic developmental delay. In an attempt to define the developmental stage of Sip1-deficient Schwann cells, we performed microarray analysis of Schwann cell-specific mutants compared to controls at the age of 25 days (P25). Sciatic nerves of 3 mutant mice and 3 corresponding controls were isolated at the age of 25 days.

2016-06-13 | E-GEOD-76027 | biostudies-arrayexpress

Expression data of sciatic nerves from mice with Schwann-cell specific Sip1 deletion compared to control mice.

2016-06-13 | GSE76027 | GEO

Gene expression in adult sciatic nerves upon miRNA ablation and crush injury

Project description:We report RNA sequencing data from induced Schwann cell specific knockouts for DICER and DGCR8 as well as crush injured wild type animals. Induced deletion of DICER and DGCR8 results in expression of numerous injury response genes suggesting a requirement of those proteins in maintaining the myelinated Schwann cell fate.

2018-10-08 | GSE109074 | GEO

RNA sequencing of control and dnm2-knockout mouse sciatic nerves

Project description:In this study, we analyzed the transcriptome profiles of mouse sciatic nerves after developmental (P1 and P5) or inducible (4 weeks post Tamoxifen) deletion of Dnm2 conditionally in Schwann cells (using a P0Cre-driven or a P0CreERT2-driven recombination of floxed alleles, respectively) as compared to controls (floxed Dnm2 homozygous, Cre-negative).

2019-01-16 | GSE113106 | GEO

RNA-seq analysis lncRNA and mRNA between crushed sciatic nerves and intact contralateral nerves

Project description:To investigate the potential function of lncRNAs in Schwann cell (SCs) response to sciatic nerve damage and repair, we extracted the total RNA of crushed sciatic nerves and intact contralateral nerves for RNA-sequencing (RNA-seq). A total of 98 differentially expressed lncRNAs (including 46 up-regulated and 52 down-regulated lncRNAs) and 77 differentially expressed mRNAs (including 55 up-regulated and 22 down-regulated mRNAs) were identified between crushed sciatic nerves and normal control (log 2 FC > 1 and p < 0.001).

2022-07-06 | GSE149657 | GEO

RNA sequencing analysis of PINCH mutant sciatic nerves

Project description:During peripheral nervous system (PNS) development, Schwann cells (SC) depend on interactions between extracellular matrix proteins, integrins and growth factor signal transduction pathways for survival, sorting and wrapping of axon segments to form myelin. Together with integrin-linked-kinase and parvins, PINCH (Particularly-interesting-new-cystidin-hystidin-rich protein) forms a heterotrimeric complex referred to as the IPP complex, which functions as a signaling hub connecting integrins with various signaling pathways. Using SC-specific conditional gene targeting in mice, gene expression profiling by RNAseq, and other methodologies, we demonstrate distinct functional roles for PINCH1 and PINCH2 in SC.

2017-12-31 | GSE106413 | GEO

Transcriptome analyses of miRNA pathway mutants and injury response in developing and adult sciatic nerves

Project description:We addressed the requirement of DGCR8, DROSHA and DICER functions in developing and adult Schwann cells (SCs) using mouse mutants. We found that the microprocessor components DGCR8 and DROSHA are crucial for axonal radial sorting and to establish correct SC numbers upon myelination. Transcriptome analysis revealed that the microprocessor is essential to prevent aberrant accumulation and de novo expression of injury-response genes. Those genes are predicted targets of stage-specifically enriched miRNAs. In agreement, DGCR8 and DICER are required for proper maintenance of the myelinated SC state. We conclude that the miRNA pathway is crucial for preventing inappropriate activity of injury response genes in developing and adult SCs.

2018-10-08 | GSE109075 | GEO

Gene expression comparison between Ebf2 -/- and WT P2 Sciatic nerves

Project description:Ebf genes regulate differentiation of several cell type. Ebf2 is expressed in Schwann cells and Ebf2-/- mice show among other phenotypical abnormalities a delay in the onset of myelination associated to a decreased expression of genes regulating myelination. In addition at one month of age Ebf2-/- mice show decreased motor conduction velocity and morphological alteration in sciatic nerves. Ebf2 target genes are unknown. To identify Ebf2 target genes with a role in myelination, we compared the expression profiles of sciatic nerves isolated from P2 Wt and Ebf2-/- mice by microarray analysis. We used microarray to find Ebf2 candidate target genes by comparing gene expression of Ebf2-/- sciatic nerve and wt nerves 2 days postnatally (P2) a time point in which Ebf2-/- pups present a delay in the onset of myelination.

2016-12-21 | GSE68326 | GEO

Ablation of Dicer from murine Schwann cells increases their proliferation while blocking myelination

Project description:The myelin sheaths that surround the thick axons of the peripheral nervous system are produced by the highly specialized Schwann cells. Differentiation of Schwann cells and myelination occur in discrete steps. Each of these requires coordinated expression of specific proteins in a precise sequence, yet the regulatory mechanisms controlling protein expression during these events are incompletely understood. Here we report that Schwann cell-specific ablation of the enzyme Dicer1, which is required for the production of small non-coding regulatory microRNAs, fully arrests Schwann cell differentiation, resulting in early postnatal lethality. Dicer-/- Schwann cells had lost their ability to myelinate, yet were still capable of sorting axons. Both cell death and, paradoxically, proliferation of immature Schwann cells was vastly enhanced, suggesting that their terminal differentiation is triggered by growth-arresting regulatory microRNAs. Using microRNA microarrays, we identified 16 miRNAs that are upregulated upon myelination and whose expression is controlled by Dicer in Schwann cells. This set of microRNAs appears to drive Schwann cell differentiation and myelination of peripheral nerves, thereby fulfilling a crucial function for survival of the organism. Samples representing Schwann cell-specific ablation of the enzyme Dicer1 and wild type controls at developmental stages E17 and P4. Geometric mean-averaged data linked below as supplementary file.

2010-12-01 | E-GEOD-22023 | biostudies-arrayexpress

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