Conditional deletion of miR-21 in sensory neurons is associated with gene changes in macrophages isolated from L4/L5 ipsilateral DRG
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ABSTRACT: A microarray analysis (MA) on the F4/80+ CD11b+ macrophages (population P5) isolated from a pool of ipsilateral L4/L5 DRG in spared nerve injured WT and miR-21 cKO
Project description:Conditional deletion of miR-21 in sensory neurons is associated with gene changes in macrophages isolated from L4/L5 ipsilateral DRG
Project description:Expression profiling of L4 and L5 Dorsal Root Ganglion (DRG) in the spinal nerve ligation model of neuropathic pain. The goal of the study was to identify genes involved in neuropathic pain This series of samples comprises of contralateral and ipsilateral L4 and L5 DRG tissue collected 4 weeks after rats underwent a L5 spinal nerve ligation (SNL) or a sham operation with no L5 spinal nerve ligation. This defines 8 groups (i) contralateral L4 DRG from the sham cohort (n=5), (ii) ipsilateral L4 DRG from sham cohort (n=5), (iii) contralateral L4 DRG from SNL cohort (n=5), (iv) ipsilateral L4 DRG from the SNL chort (n=5), (v) contralateral L5 DRG from the sham cohort (n=5), (vi) ipsilateral L5 DRG from sham cohort (n=5), (vii) contralateral L5 DRG from SNL cohort (n=5), (viii) ipsilateral L5 DRG from the SNL cohort (n=5)
Project description:Complex regional pain syndrome type-I (CRPS-I) is chronic neurological disorder accompanied with devastating pain. In this study, we employed single-cell sequencing technology to analyze the ipsilateral L4-L6 dorsal root ganglia in both Sham and CPIP groups, aiming to investigate the mechanisms underlying chronic pain development in the CPIP model.
Project description:L5 DRG samples from CCI, Seltzer and sham models collected at 14, 21 and 50 days after surgery from ipsilateral hind limb. Note that all replicates are techincal, i.e., there were no biological replicates in this study as samples were pooled for each group Keywords: ordered
Project description:DRG samples were extracted at 28 and 50 days from L5 spinal nerve ligated rats and sham operated rats. Samples were pooled for each time point per group and hybridised to duplicate to RG_u34 genchips (A, B and C chips). Keywords: Disease state analysis
Project description:Expression of L4 DRG after sciatic nerve cut compared to contralateral uninjured DRGs. The "SAMPLE_ID" sample characteristic is a sample identifier internal to Genentech. The ID of this project in Genentech's ExpressionPlot database is PRJ0003322 Keywords: Expression profiling by array
Project description:Notch signaling is an evolutionarily conserved pathway for specifying binary neuronal fates, yet how it specifies different fates in different contexts remains elusive. In our accompanying paper, using the Drosophila lamina neuron types (L1-L5) as a model, we show that the primary homeodomain transcription factor (HDTF) Bsh activates secondary HDTFs Ap (L4) and Pdm3 (L5) and specifies L4/L5 neuronal fates. Here we test the hypothesis that Notch signaling enables Bsh to differentially specify L4 and L5 fates. We show asymmetric Notch signaling between newborn L4 and L5 neurons, but they are not siblings; rather, Notch signaling in L4 is due to Delta expression in adjacent L1 neurons. While Notch signaling and Bsh expression are mutually independent, Notch is necessary and sufficient for Bsh to specify L4 fate over L5. The NotchON L4, compared to NotchOFF L5, has a distinct open chromatin landscape which allows Bsh to bind distinct genomic loci, leading to L4-specific identity gene transcription. We propose a novel model in which Notch signaling is integrated with the primary HDTF activity to diversify neuron types by directly or indirectly generating a distinct open chromatin landscape that constrains the pool of genes that a primary HDTF can activate.
Project description:How our brain generates diverse neuron types that assemble into precise neural circuits remains unclear. Using Drosophila lamina neuron types (L1-L5), we show that the primary homeodomain transcription factor (HDTF) Brain-specific homeobox (Bsh) is initiated in progenitors and maintained in L4/L5 neurons to adulthood. Bsh activates secondary HDTFs Ap (L4) and Pdm3 (L5) and specifies L4/L5 neuronal fates while repressing the HDTF Zfh1 to prevent ectopic L1/L3 fates (control: L1-L5; Bsh-knockdown: L1-L3), thereby generating lamina neuronal diversity for normal visual sensitivity. Subsequently, in L4 neurons, Bsh and Ap function in a feed-forward loop to activate the synapse recognition molecule DIP-β, thereby bridging neuronal fate decision to synaptic connectivity. Expression of a Bsh:Dam specifically in L4 reveals Bsh binding to the DIP-β locus and additional candidate L4 functional identity genes. We propose that HDTFs function hierarchically to coordinate neuronal molecular identity, circuit formation, and function. Hierarchical HDTFs may represent a conserved mechanism for linking neuronal diversity to circuit assembly and function.
Project description:The gene expression profiles of mycobacteriophage D29 and StarStuff were analyzed 15min, 30min, 60min and 150min post-infection (MOI=3), as well as a StarStuff lysogen. The gene expression profiles of 30min and 150min post-induction of an L5 thermo-inducible lysogen, as well as the L5 lysogen itself.