Genes that were altered after chemogenetic activation of endogenous oxytocin in the dorsal horn
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ABSTRACT:
PROVIDER: PRJNA866112 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR20827435_1.fastq.gz | Fastqsanger.gz | |||
| SRR20827435_2.fastq.gz | Fastqsanger.gz | |||
| SRR20827436_1.fastq.gz | Fastqsanger.gz | |||
| SRR20827436_2.fastq.gz | Fastqsanger.gz | |||
| SRR20827437_1.fastq.gz | Fastqsanger.gz |
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Project description:Purpose: RNAseq analysis was carried out to investigate the alterd genes by chemogenetic activation of endogenous oxytocin in the superficial layer (laminae I-II) and deep layer (laminae III-VI) of the dorsal horn. Methods: At 120 min after the s.c. administration of Saline or CNO (1 mg/kg) (n=3, each), adult male oxytocin-hM3Dq-mCherry transgenic rats were decapitated immediately without being anesthetized. Spinal cords specimens including laminae I-II and III-VI were collected separately. Results: 254 genes in the laminae I-II, and 191 genes in the laminae III-VI of the dorsal horn were significantly altered after chemogenetic activation of endogenous oxytocin.
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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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Project description:As rats do not develop neuropathic pain like hypersensitivity as neonates post nerve injury but do as adults we have used these arrays to help define the processes involved in this process. Rat spinal cord (ipsilateral dorsal horn) was assayed 7 days post SNI injury to the sciatic nerve relative to sham injury. Two age groups of animals were tested Neonates (P10) and Adult (8-12wks). Experiment Overall Design: Six biologically indepenedent arrays were hybridized per assay point. Dorsal horn total RNA was prepared using standard Affymetrix protocols. Affymetrix Rat Expression 230A array used.
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