ABSTRACT: The goal of this study was to test the effects of biobanking on chromatin assessibility, as defined by ATAC-seq. Human naïve B cells were FACS sorted from PBMCs that were either frozen or processed fresh. A range of cell numbers were used to identify technical limitations and reproducibility of the ATAC-seq assay on biobanked PBMCs comapred to freshly sorted material. To provide insight into a disease process, naive B cells were isolated from healthy donors or a biorepository of Systemic Lupus Erythematosus undergoing disease flares. These data identify a unique signature of accessible chromatin in SLE B cells.
Project description:Disease activity in patients with systemic lupus erythematosus (SLE) may fluctuate between flares and remissions, complicating effective disease management. The aim of this study is to detect early signs of cellular attributes responsible for flares and to understand dynamic changes in the immune system. Peripheral blood mononuclear cells were collected at different time points throughout the disease course from 6 patients with SLE (n = 19) and 32 healthy donors fromthe Asian Immune Diversity Atlas (AIDA), and subsequently underwent to generate single cell gene expression combined with T cell receptor (TCR) and B cell receptor (BCR) clonotypes data (10X Chromium 5’, TCR sequencing).
Project description:RNA sequencing of systemic lupus erythematosus (SLE) and healthy PBMCs to measure transcriptional changes in gene and endogenous retrovirus expression
Project description:We established m6A modification profiles using MeRIP-seq in peripheral blood mononuclear cells (PBMCs) from systemic lupus erythematosus (SLE) patients and controls (HC), and investigated m6A-related lncRNAs in SLE for novel potential roles in SLE. Compared with controls, m6A level was lower in SLE patients,426 lncRNAs and 2,331 mRNAs were differentially expressed in SLE patients.
Project description:To further explore the role of long non-coding RNAs in the systemic lupus erythematosus (SLE), we assessed the transcriptome of PBMCs from healthy controls and SLE patients using ncRNA sequencing analysis. The data were analyzed for differential expression with a nominal P<0.05. Our study aimed to discover novel biomarkers for SLE diagnosis and prognosis.
Project description:Most systemic lupus erythematosus (SLE) patients are photosensitive and ultraviolet B light (UVB) exposure worsens cutaneous disease and precipitates systemic flares of disease. The pathogenic link between skin disease and systemic exacerbations in SLE remains elusive. In an acute model of UVB-triggered inflammation, we observed that a single UV exposure triggered a striking IFN-I signature not only in the skin, but also in the blood and kidneys. The early IFN-I signature was significantly higher in female compared to male mice. The early IFN-I response in the skin was almost entirely, and in the blood partly, dependent on the presence of cGAS, as was skin inflammatory cell infiltration. Inhibition of cGAMP hydrolysis augmented the UVB-triggered IFN-I response. UVB skin exposure leads to cGAS-activation and both local and systemic IFN-I signature and could contribute to acute flares of disease in susceptible subjects such as patients with SLE.
Project description:The goal of this study is to define the molecular signatures of SLE patients at baseline in BMS IM101042 trial. IM101042 (NCT00119678) is a phase IIb, multi-center, randomized, double-blind, placebo-controlled study to evaluate the efficacy and safety of abatacept vs placebo on a background of oral glucocorticosteroids in the treatment of subjects with systemic lupus erythematosus and the prevention of subsequent lupus flares, sponsored by Bristol-Myers Squibb.
Project description:To investigate the lncRNAs expression profiling in CD4+ T cells of systemic lupus erythematosus (SLE) patients, we have employed “Agilent Human lncRNA 4*180K microarray” as a discovery platform to identify lncRNAs and mRNAs expression signatures in CD4+ T cells between SLE patients and normal controls. CD4+ T cells were isolated from peripheral blood mononuclear cells (PBMCs) of peripheral blood in SLE patients and normal controls, respectively.
Project description:Genome Wide Association Studies (GWAS) have been successful in yielding >60 loci for Systemic Lupus Erythematosus (SLE). However, it is known that GWAS just reports genomic signals and not necessarily the precise localization of culprit genes, with eQTL efforts only able to infer causality to a minority of such loci. Thus, we sought to carry out physical and direct ‘variant to gene mapping’ by integrating results from high-throughput chromatin conformation capture and ATAC-seq assays. This experiment refers to the ATAC-seq part of our work. To determine informative proxy SNPs for each of the SLE GWAS sentinel loci, we generated ATAC-seq open chromatin maps for primary human T Follicular Helper (TFH) cells from tonsils of healthy volunteers (3 biological replicates), a model relevant to SLE as TFH operate upstream of the activation of pathogenic autoantibody-producing B cells during the disease. We also generated open chromatin maps for naive CD4-positive helper T cells (3 biological replicates).
Project description:IRF5 and STAT4 are strongly associated with human systemic lupus erythematosus (SLE). By performing chromatin immunoprecipitation-sequencing (ChIP-Seq) in human peripheral blood mononuclear cells (PBMCs), we identified more than 7000 target genes for IRF5 and STAT4 in stimulated PBMCs. Contrarily, without stimulation IRF5 seemed to be inactive, and STAT4 only showed low levels of transcriptional regulatory activity. Target genes of IRF5 and STAT4 were identified in human PBMCs with or without stimulation using ChIP-Seq.
Project description:ATAC-seq analysis of CD4 T cell populations obtained in blood of systemic lupus erythematosus (SLE) patients. The overall goal of this study was to determine chromatin accessibility profiles in Tfh cells and CXCR3+ PD1hi CD4+ T cells obtained from blood of SLE donors.