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H3K9ac, H3K27ac, H3K27me3 ChIP sequencing and ATAC sequencing of L4-L6 Dorsal Root Ganglia upon spinal or sciatic axonal injury

ABSTRACT: Purpose: compare the epigenetic response of DRG neurons to an axonal injury in the peripheral vs central nervous system by measuring accessible chromatin and several histone marks Results: we found that after peripheral axonal injury there is a much greater number of epigenetic changes than after central spinal injury, and that these epigenetic changes after peripheral axotomy tended toward increased chromatin accessibility.

ORGANISM(S): Mus musculus

PROVIDER: GSE108806 | GEO | 2019/06/19

REPOSITORIES: GEO

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HDAC3 ChIP sequencing of L4-L6 Dorsal Root Ganglia upon spinal or sciatic axonal injury

Project description:Purpose: A) compare the response to an axonal injury in the peripheral vs central nervous system B) clarify the role of HDAC3 in axonal regeneration Results: we found that after peripheral axonal injury there is a higher number of differentially expressed genes regulated by HDAC3 with respect to central injury with a number of genes associated with regenerative pathways

2018-10-01 | GSE104977 | GEO

RNA sequencing of Dorsal Root Ganglia upon axonal injury, in presence or absence of NAC (N-acetyl cysteine), and upon H2O2 nerve treatment

Project description:Purpose: A) compare the response to an axonal injury in the peripheral vs central nervous system B) clarify the mechanism of Reactive Oxygen Species-dependent axonal regeneration Results: we found that after peripheral axonal injury there is a higher number of differentially expressed genes with respect to central injury. Moreover,inflammation related genes and regeneration-associated genes were differentially regulated after peripheral injury and H2O2, but less after central injury. Signalling pathways and biological processes related to injury-dependent nerve regeneration were reduced with the addition of NAC at the time of sciatic injury compared to vehicle.

2018-07-06 | GSE97090 | GEO

Comprehensive mapping of 5-hmC epigenetic dynamics in axon regeneration

Project description:In contrast to CNS neurons, dorsal root ganglia (DRG) neurons can switch to a regenerative state after peripheral axotomy. In a screen for chromatin regulators of the regenerative responses in this conditioning lesion paradigm, we identified Tet methylcytosine dioxygenase 3 (Tet3) as upregulated, along with increased 5-hydroxymethylcytosine (5-hmC) in DRG neurons. We generated genome-wide 5-hmC maps in adult DRG, which demonstrated that peripheral and central axotomy (no regenerative effect) triggered differential 5-hmC changes that are associated with distinct signaling pathways. 5-hmC was altered in half of regeneration-associated genes (RAGs), supporting its role for RAG regulation. Our analyses predicted transcription factors HIF-1, STAT and IRF that may collaborate with Tet3 for 5-hmC modifications. Intriguingly, central axotomy lead to widespread 5-hmC modifications with little overlap with peripheral axotomy, thus potentially constituting a roadblock for regeneration. Our study revealed 5-hmC as a previously unrecognized epigenetic mechanism underlying the divergent responses after axonal injury.

2016-12-09 | GSE85972 | GEO

ATAC sequencing and RNA sequencing of L4-L6 mouse Dorsal Root Ganglia upon dorsal column axotomy plus injection of the histone deacetylase inhibitor MS275

Project description:Purpose: compare the response of DRG neurons to a central axonal injury in presence of histone deacetylase inhibitor by measuring accessible chromatin and transcription Results: we found that MS-275 was able to induce changes in chromatin accessibility and gene expression. In particular, an increased accessibility correlated with changes in gene expression, and a decreased accessibility correlated with gene downregulation

2019-06-19 | GSE132382 | GEO

HDAC3 ChIP sequencing of L4-L6 Dorsal Root Ganglia upon spinal or sciatic axonal injury

Project description:HDAC3 ChIP sequencing of L4-L6 Dorsal Root Ganglia upon spinal or sciatic axonal injury

| PRJNA414293 | ENA

H3K9ac, H3K27ac, H3K27me3 ChIP sequencing and ATAC sequencing of L4-L6 Dorsal Root Ganglia upon spinal or sciatic axonal injury

Project description:H3K9ac, H3K27ac, H3K27me3 ChIP sequencing and ATAC sequencing of L4-L6 Dorsal Root Ganglia upon spinal or sciatic axonal injury

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MeDIP-chip from dorsal root ganglia (DRG) tissue from wildtype mice, for 5-methyl-cytosine

Project description:Nerve injury in the peripheral nervous system allows spontaneous regeneration, in contrast to injury of central nerves, which lead to a differential expression pattern of regeneration-associated genes and others. These genes might be regulated by promoter DNA methylation As regeneration model, DRG tissue was analyzed for methyated gene promoters and CpG islands following both injury types. A differential methylation pattern could be identified, although most genes remained unmethylated. comparison of DRG following either sciatic nerve axotomy (SNA) or dorsal column axotomy (DCA) - each 'real injury or sham' - at 1, 3 or 7 days post-injury vs. 'naive', Each sample was pooled from two mice, yielding an immunoprecipitated sample ('Test') and an input genomic DNA sample (Ref). altogether 33 microarrays were used for 13 conditions with triplicate arrays for 'real injury' or 'naive' samples, and duplicate arrays for 'sham' samples.

2014-03-05 | E-GEOD-55514 | biostudies-arrayexpress

Transcription profiling of Xenopus dorsal root ganglia conditioned in vitro vs freshly dissected control

Project description:Axonal regeneration is enhanced by prior conditioning peripheral nerve lesions. Here we show that Xenopus dorsal root ganglia (DRGs) with attached peripheral nerves (PN-DRGs) can be conditioned in vitro, thereafter showing enhanced axonal growth in response to neurotrophins, similar to preparations conditioned by axotomy in vivo. In contrast to freshly dissected preparations, conditioned PN-DRGs show abundant neurotrophin-induced axonal growth in the presence of actinomycin D, suggesting synthesis of mRNA encoding proteins necessary for axonal elongation occurs during the conditioning period, and this was confirmed by oligonucleotide micro-array analysis.

2008-04-16 | E-MEXP-1297 | biostudies-arrayexpress

Transcriptional reprogramming of distinct peripheral sensory neuron subtypes after axonal injury

Project description:Primary somatosensory neurons specialize in transmitting distinct types of sensory information through differences in cell size, myelination, and the expression of various receptors and ion channels, which together define their transcriptional and functional identity. By profiling sensory ganglia at single-cell resolution, we find that the different somatosensory neuronal subtypes undergo a similar transcriptional response to peripheral nerve injury that both promotes axonal regeneration and suppresses cell identity. This transcriptional reprogramming, which is not observed in non-neuronal cells from sensory ganglia, resolves over a similar time course as target reinnervation and is associated with the restoration of original cell identity. Injury-induced transcriptional reprogramming requires ATF3, a transcription factor which is induced rapidly after injury and necessary for axonal regeneration and functional recovery. Our findings suggest that the transcription factors induced early after peripheral sensory neuron injury promote their transcriptional and functional metamorphosis, analogous to their known roles in reprogramming cell fate.

2020-07-22 | GSE154659 | GEO

RNA sequence reveals mouse retinal transcriptome changes early after axonal injury

Project description:Purpose: The purpose of this study was　to use RNA-seq to investigate the molecular mechanisms of damage in the early stages of the response to axonal injury, before the onset of RGC death. Methods: 12-week-old wild-type (WT) mice were used in this study. The experiment group underwent an optic nerve crush (ONC) procedure to induce axonal injury in the right eye, and the control group underwent a sham procedure. Retinal mRNA profiles were generated by deep sequencing, in triplicate, using IlluminaHiseq2000. The sequence reads were analyzed by CLC genomics workbench and R software. qRT–PCR validation was performed using TaqMan assays. Results: Using an optimized data analysis workflow, we mapped about 66 million sequence reads per sample to the mouse genome (build mm9). Differential gene expression analysis showed that endoplasmic reticulum stress-related genes and antioxidative response-related genes have been shown to be significantly upregulated 2 days after ONC. Conclusions: Our study represents the first detailed analysis of retinal transcriptomes in the early stages after axonal injury. Our results indicated that ER stress plays a key role under these conditions. Furthermore, the antioxidative defense and immune responses occurred concurrently in the early stages after axonal injury. We believe that our study will lead to a better understanding of and insight into the molecular mechanisms underlying RGC death after axonal injury. Retinal mRNA profiles of 12 week-old wild type (WT) after ONC or sham were generated by deep sequencing, in triplicate, using Illumina Hiseq2000.

2014-02-21 | E-GEOD-55228 | biostudies-arrayexpress

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