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RNA-seq analysis of FACS-sorted control and Tsc2 cKO nociceptors with and without sciatic nerve crush

ABSTRACT: RNA-seq analysis of FACS-sorted control and Tsc2 cKO nociceptors with and without sciatic nerve crush

PROVIDER: PRJNA517164 | ENA |

REPOSITORIES: ENA

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RNA-seq analysis of FACS-sorted control and Tsc2 cKO nociceptors with and without sciatic nerve crush

Project description:The goals of this study are to compare the transcriptomes of control heterozygous and Tuberous sclerosis 2 (Tsc2) homozygous nociceptors 3 days after sciatic nerve injury that have been enriched by fluorescence-associated cell sorting (FACS) with the aim of identifying differences in genes associated with axon regeneration. Nav1.8-Cre transgenic mice were used to delete Tsc2 as well as express Green fluorescent protein from the Rosa26 locus. Tsc2 deletion constitutively activates mTORC1 signaling cell autonomously. Dissociated dorsal root ganglia from adult mice were FACS-sorted for GFP and analyzed by RNA-seq. We find that the expression of a number of regeneration-associated transcription factors including cJun, Atf3, Sox11 and other are upregulated in Tsc2 mutant neurons in the absence of an injury. Additionally, the target genes of several other normally expressed regeneration-associated transcription factors are differentially expressed in Tsc2 mutant neurons, such as Creb1 and Klf’s. We conclude Tsc2 deletion and consequent mTORC1 activation establishes a pro-regenerative gene expression profile in nociceptors in the absence of an injury.

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RNA-seq analysis of FACS-sorted control and Tsc2-deleted nociceptors

Project description:The goals of this study are to compare the transcriptomes of control heterozygous and Tuberous sclerosis 2 (Tsc2) homozygous nociceptors that have been enriched by fluorescence-associated cell sorting (FACS) with the aim of identifying differences in genes associated with sensory behavior. Nav1.8-Cre transgenic mice were used to delete Tsc2 as well as express Green fluorescent protein from the Rosa26 locus. Tsc2 deletion constitutively activates mTORC1 signaling cell autonomously. Dissociated dorsal root ganglia from adult mice were FACS-sorted for GFP and analyzed by RNA-seq. We find that a number of sensory behavior associated genes are affected by Tsc2 deletion including Calca, Ntrk1, Mrgpra3, and Nppb. Additionally, profiling of ion channel expression showed a reduction in almost half of expressed sodium, potassium and calcium channel as well as G-protein coupled receptors. Other categories of genes such as transcription factors and ligand-gated ion channels contained an even numbers of up- and downregulated genes with many that did not change as a result of Tsc2 deletion. In addition, expression of most marker genes enriched in Isolectin B4 (IB4) negative neurons were strongly reduced in Tsc2 mutant nociceptors, consistent with reduced sensitivity to heat, which is a modality related to these neurons. We conclude Tsc2 deletion and consequent mTORC1 activation alters gene expression of nociceptors resulting in altered sensory thresholds.

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Project description:RNA-seq analysis of FACS-sorted control and Tsc2-deleted nociceptors

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DLK-gated responses in motoneurons following sciatic nerve crush

Project description:To profile downstream gene-expression changes regulated by DLK, we profiled motoneurons in the lumbar spinal cord using RiboTag, following sciatic nerve crush in both control and Dlk conditional knockout (Dlk ΔMN) mice. We found that DLK regulates the expression of many secreted proteins, which have the potential to influence the behavior of other cells, including the immune system.

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