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Single cell RNAseq provides insight into altered immune cell populations in human fracture nonunions

ABSTRACT: Single cell RNAseq provides insight into altered immune cell populations in human fracture nonunions

PROVIDER: PRJNA900553 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR22262631.fastq.gz	Fastqsanger.gz
	SRR22262632.fastq.gz	Fastqsanger.gz
	SRR22262633.fastq.gz	Fastqsanger.gz
	SRR22262634.fastq.gz	Fastqsanger.gz
	SRR22262635.fastq.gz	Fastqsanger.gz

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Single cell RNAseq provides insight into altered immune cell populations in human fracture nonunions

Project description:Nonunion describes bone fractures that fail to heal, resulting in the fracture callus failing to fully ossify or, in atrophic cases, not forming altogether. Fracture healing is regulated, in part, by the balance of pro-inflammatory and anti-inflammatory processes occurring within the bone marrow and surface cell populations. We sought to further understand the role of osteoimmunology (i.e., study of the close relationship between the immune system and bone) by examining immune cell gene expression via single-cell RNA sequencing of intramedullary canal tissue obtained from human patients with femoral nonunions. Intramedullary canal tissue samples obtained by reaming were collected at the time of surgical repair for femur fracture nonunion (n=5) or from native bone controls when harvesting autologous bone graft (n=4). Cells within the samples were isolated and analyzed using the Chromium single cell system (10x Genomics, Inc) and Illumina sequencers. Twenty-three distinct cell clusters were identified, with higher cell proportions in the nonunion samples for monocytes and CD14+ dendritic cells (DC), and lower proportions of T cells, myelocytes, and promyelocytes in nonunion samples. Gene expression differences were identified in each of the cell clusters from cell types associated with osteoimmunology, including CD14+DC, monocytes, T cells, promyelocytes, and myelocytes. These results provide human derived gene profiles that can further our understanding of pathways that may be a cause or a consequence of nonunion, providing the clinical rationale to focus on specific components of osteoimmunology. Statement of Clinical Significance. The novel single-cell approach may lead to clinically relevant diagnostic biomarkers during earlier stages of nonunion development and/or investigation into therapeutic options.

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