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Deep RNA sequencing of muscle tissue reveals absence of viral signatures in dermatomyositis

ABSTRACT: Deep RNA sequencing of muscle tissue reveals absence of viral signatures in dermatomyositis

PROVIDER: PRJEB71481 | ENA |

REPOSITORIES: ENA

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Deep RNA sequencing of muscle tissue reveals absence of viral signatures in dermatomyositis.

Project description:Objective: To explore a possible connection between active viral infections and manifestation of dermatomyositis (DM). Methods: Skeletal muscle biopsies were analyzed from patients diagnosed with juvenile (n=10) and adult (n=12) DM. Adult DM patients harbored autoantibodies against either TIF-1γ (n=7) or MDA5 (n=5). Additionally, we investigated skeletal muscle biopsies from non-diseased controls (NDC, n=5). We used an unbiased high-throughput RNA sequencing (HTS) approach to detect viral sequences. To further increase sequencing depth, a host depletion approach was applied. Results: In this observational study, no relevant viral sequences were detected either by native sequencing or after host depletion. The absence of detectable viral sequences makes an active viral infection of the muscle tissue unlikely to be the cause of DM in our cohorts. Discussion: Type I interferons (IFN) play a major role in the pathogenesis of both juvenile and adult DM. The IFN response is remarkably conserved between DM subtypes classified by specific autoantibodies. Certain acute viral infections are accompanied by a prominent type I IFN response involving similar downstream mechanisms as in DM. Aiming to elucidate the pathogenesis of DM in skeletal muscle tissue, we used deep RNA sequencing and a host depletion approach to detect possible causative viruses.

| S-EPMC10774810 | biostudies-literature

Defining cutaneous gene expression signatures in juvenile dermatomyositis

Project description:Defining cutaneous gene expression signatures in juvenile dermatomyositis

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Project description:muscle biopsies of normal and dermatomyositis patients Keywords: other

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Project description:Deep sequencing of muscle tissue reveals absence of viral signatures in Dermatomyositis

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Project description:Muscle biopsies were taken from 6 patients with dermatomyositis, 4 with polymyositis and 5 not myopathic subjects as controls. The genome-wide expression patterns were compared using Affymetrix HG-U133A chips. Experiment Overall Design: Gene expression profiles were generated for 15 individuals.

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Gene Expression Analysis of Dermatomyositis Skin

Project description:The purpose of this study was to use global gene expression analysis to determine major functional pathways and genes dysregulated in the skin of active rashes of dermatomyositis patients. These data will be used to help assign a diagnosis to skin biopsies from patients with rashes that are not clearly dermatomyositis. In addition, we will correlate gene expression changes with specific histopathologic changes in skin biopsies that are taken adjacent to those analyzed for gene expression analysis. Finally, these data will be used to search for genes and pathways that are associated with clinical outcomes and autoantibody status in this cohort of patients.

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Dermatomyositis skin transcriptomic signature

Project description:Dermatomyositis is a cutaneous and muscular auto-immune condition associated with specific autoantibodies. MDA5 antibody-associated DM has higher mortality. We demonstrate here for the first time using skin microarray analysis that MDA5+ DM is associated with a greater type I interferon skin signature than MDA5- DM, mainly involving the IFN- κ member produced by skin keratinocytes

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