Transcriptomic profiling of trigeminal nucleus caudalis (TNC) and spinal cord dorsal horn (SC)
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA438118 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6829500_1.fastq.gz | Fastqsanger.gz | |||
| SRR6829500_2.fastq.gz | Fastqsanger.gz | |||
| SRR6829491_1.fastq.gz | Fastqsanger.gz | |||
| SRR6829491_2.fastq.gz | Fastqsanger.gz | |||
| SRR6829501_1.fastq.gz | Fastqsanger.gz |
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Project description:Although several underlying pathophysiological processes have been explored, the origin and precise pathomechanism of migraine are still being debated. Inflammatory pathways have been suggested to play role in migraine, trigeminal nociceptor sensitisation, thereby causing hyperalgesia and allodynia. The aim of the present study was to investigate gene expression changes in trigeminal ganglia (TRG), central trigeminal nucleus caudalis (TNC) and peripheral blood mononuclear cells (PBMC) evoked by Complete Freund’s Adjuvant (CFA) induced peripheral inflammation. 512 differentially expressed genes were found between CFA-treated and contralateral TRG samples 7 days after CFA injection. The mRNA expression changes of G-protein coupled receptor 39 (Gpr39), kisspeptin-1 receptor (Kiss1r), kisspeptin (Kiss1) and Lkaaear1 were selected for validation. They were most upregulated on day 3 in TRGs of the CFA-treated side. CFA-induced significant orofacial mechanical allodynia in one day with a maximum on day 3. This correlated with patterns of neuronal (Fosb), glial (Iba1), and astrocyte (Gfap) activation markers in both TRG and TNC, and surprisingly in PBMCs. Similar transcriptional changes of Cgrp, the well-known key molecule in migraine pathophysiology, were also revealed. In TNCs, gene expression changes similar to TRGs were observed but Kiss1r transcripts were not significantly altered while Neurod2 was observed only in TNC. These results could indicate the involvement of Gpr39, Kiss1r and synaptic plasticity associated Lkaaear1, Neurod2 genes in the cascade of events resulting in the sensitization underlying migraine headache and the accompanying facial allodynia.
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Project description:The dorsal horn of the spinal cord transforms incoming somatosensory information and transmits it supraspinally to generate sensory perception, including pain and itch. Recent research using mouse Cre-driver lines has implicated specific populations of dorsal horn neurons in the transmission of different types of pain. In parallel, human genome-wide association studies (GWAS) have identified dozens of loci confidently associated with the genetic predisposition to chronic pain. The ability to connect controlled experiments in rodent models with human genetic studies could provide a platform for translational research, but the cell type heterogeneity of the dorsal horn and the complex genetic architecture of chronic pain have created challenges in bridging that gap. Here, we apply a variety of single cell genomic technologies and a comparative genomic analysis to identify conserved dorsal horn neuron subtypes whose open chromatin regions show enrichment for genetic variants associated with human chronic pain phenotypes. To achieve this, we first use single nucleus RNA-Seq and fluorescence in situ hybridization in Rhesus macaque to create a more detailed map of primate dorsal horn neuron subtypes. These were integrated with publicly available human and mouse single nucleus RNA-Seq datasets to create a multi-modal cross species atlas. Then, for the mouse dorsal horn, we combined single nucleus RNA-Seq, spatial transcriptomics, and single nucleus ATAC-Seq to infer spatial and epigenomic profiles of conserved dorsal horn neuron subtypes. Finally, we compared our conserved cell-type open chromatin resource to chronic pain GWAS and found that open chromatin regions of specific dorsal horn neuron subtypes showed enrichment for a variety of human chronic pain phenotypes. Our results provide a foundation to further explore how conserved dorsal horn neuron subtypes influence the transmission of pain signals.
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