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Chromatin accessibility changes underlying progression from islet autoantibody positivity to type 1 diabetes

ABSTRACT: Chromatin accessibility changes underlying progression from islet autoantibody positivity to type 1 diabetes

PROVIDER: PRJNA767892 | ENA |

REPOSITORIES: ENA

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Chromatin accessibility changes underlying progression from islet autoantibody positivity to type 1 diabetes

Project description:Type 1 diabetes (T1D) usually has a preclinical phase identified by the presence of circulating autoantibodies to pancreatic islet antigens, and most young children who have multiple autoantibodies progress to diabetes within 10 years. While autoantibodies denote underlying islet autoimmunity, how this process is initiated and then progresses to clinical diabetes on a background of genetic susceptibility is not clearly understood. Only one study has thus far reported changes in gene expression in isolated immune cells associated with progression to islet autoimmunity. We analysed chromatin accessibility by ATAC-seq in CD4+ T cells in four genetically at-risk children with islet autoantibodies who progressed to diabetes in ≤ 3 years (‘progressors’), compared to five at-risk children matched for sex, age and HLA who had not progressed (‘non-progressors). From ATAC-seq data, we generated the first map of chromatin accessibility in T cells of islet autoantibody-positive children. Progression was associated with a subtle reconfiguration of regulatory chromatin regions, and some of the chromatin conformation changes could be linked to progression associated expression changes at cytotoxic genes.

2022-03-09 | GSE185189 | GEO

Transcriptional and chromatin accessibility changes underlying progression from islet autoantibody positivity to type 1 diabetes

Project description:Transcriptional and chromatin accessibility changes underlying progression from islet autoantibody positivity to type 1 diabetes

| PRJNA767889 | ENA

Transcriptional changes underlying progression from islet autoantibody positivity to type 1 diabetes

Project description:Transcriptional changes underlying progression from islet autoantibody positivity to type 1 diabetes

| PRJNA767893 | ENA

Transcriptional changes underlying progression from islet autoantibody positivity to type 1 diabetes

2022-03-09 | GSE185190 | GEO

Islet Sympathetic Innervation and Islet Neuropathology in Patients with Type 1 Diabetes

Project description:Dysregulation of glucagon secretion in type 1 diabetes (T1D) involves hypersecretion during postprandial states, but insufficient secretion during hypoglycemia. The sympathetic nervous system regulates glucagon secretion. To investigate islet sympathetic innervation in T1D, sympathetic tyrosine hydroxylase (TH) axons were analyzed in control non-diabetic organ donors, non-diabetic islet autoantibody-positive individuals (AAb), and age-matched persons with T1D. Islet TH axon numbers and density were significantly decreased in AAb compared to T1D with no significant differences observed in exocrine TH axon volume or lengths between groups. TH axons were in close approximation to islet α-cells in T1D individuals with long-standing diabetes. Islet RNA-sequencing and qRT-PCR analyses identified significant alterations in noradrenalin degradation, α-adrenergic signaling, cardiac b-adrenergic signaling, catecholamine biosynthesis, and additional neuropathology pathways. The close approximation of TH axons at islet α-cells supports a model for sympathetic efferent neurons directly regulating glucagon secretion. Sympathetic islet innervation and intrinsic adrenergic signaling pathways could be novel targets for improving glucagon secretion in T1D.

2021-08-09 | GSE181674 | GEO

Circulating Metabolites in Progression to Islet Autoimmunity and Type 1 Diabetes

Project description:<h4><strong>AIMS/HYPOTHESIS: </strong>Metabolic dysregulation may precede the onset of type 1 diabetes. However, these metabolic disturbances and their specific role in disease initiation remain poorly understood. In this study, we examined whether children who progress to type 1 diabetes have a circulatory polar metabolite profile distinct from that of children who later progress to islet autoimmunity but not type 1 diabetes and a matched control group.</h4><h4><strong>METHODS: </strong>We analysed polar metabolites from 415 longitudinal plasma samples in a prospective cohort of children in three study groups: those who progressed to type 1 diabetes; those who seroconverted to one islet autoantibody but not to type 1 diabetes; and an antibody-negative control group. Metabolites were measured using two-dimensional GC high-speed time of flight MS.</h4><h4><strong>RESULTS: </strong>In early infancy, progression to type 1 diabetes was associated with downregulated amino acids, sugar derivatives and fatty acids, including catabolites of microbial origin, compared with the control group. Methionine remained persistently upregulated in those progressing to type 1 diabetes compared with the control group and those who seroconverted to one islet autoantibody. The appearance of islet autoantibodies was associated with decreased glutamic and aspartic acids.</h4><h4><strong>CONCLUSIONS/INTERPRETATION: </strong>Our findings suggest that children who progress to type 1 diabetes have a unique metabolic profile, which is, however, altered with the appearance of islet autoantibodies. Our findings may assist with early prediction of the disease.</h4>

2022-01-19 | MTBLS802 | MetaboLights

Serological autoantibody profiling of type 1 diabetes by protein arrays.

Project description:The study was aimed to identify novel autoantibody(AAB) biomarkers for Type 1 diabetes.

2019-03-05 | GSE45515 | GEO

transcriptional profile of islet EVs for diabetes genes

Project description:Identification of transcriptional profile of several genes involved in diabetes in islet-derived extracellular vesicles (Evs). Recently, EVs are identified as a new mechanism in cell-to-cell communication by transfer of protein and genic information (mRNA, microRNA). Their role is under investigation in immunology, stem cell and cancer, but not in islets and diabetes. The aim of this experiment is to identify mRNA transcripts (in particular, mRNA transcripts involved in diabetes pathophysiology) present in islet Evs.

2012-08-02 | E-MEXP-3695 | biostudies-arrayexpress

Changes in the Coexpression of Innate Immunity Genes During Persistent Islet Autoimmunity Are Associated With Progression of Islet Autoimmunity: Diabetes Autoimmunity Study in the Young (DAISY)

Project description:Longitudinal changes in gene expression during islet autoimmunity (IA) may provide insight into biological processes that explain progression to type 1 diabetes (T1D). We identified individuals from Diabetes Autoimmunity Study in the Young (DAISY) who developed IA, autoantibodies present on two or more visits. Illumina's NovaSeq 6000 was used to quantify gene expression in whole blood. With linear mixed models we tested for changes in expression after IA that differed across individuals who progressed to T1D (progressors) (n = 25), reverted to an autoantibody-negative stage (reverters) (n = 47), or maintained IA positivity but did not develop T1D (maintainers) (n = 66). Weighted gene coexpression network analysis was used to identify coexpression modules. Gene Ontology pathway analysis of the top 150 differentially expressed genes (nominal P < 0.01) identified significantly enriched pathways including leukocyte activation involved in immune response, innate immune response, and regulation of immune response. We identified a module of 14 coexpressed genes with roles in the innate immunity. The hub gene, LTF, is known to have immunomodulatory properties. Another gene within the module, CAMP, is potentially relevant based on its role in promoting β-cell survival in a murine model. Overall, results provide evidence of alterations in expression of innate immune genes prior to onset of T1D.

2023-05-01 | GSE230370 | GEO

Risk of T1D progression in islet autoantibody positive children can be further stratified using expression patterns of multiple genes implicated in peripheral blood lymphocyte activation and function

Project description:To identify genes with expression levels that are associated with T1D progression from AbP (islet autoantibody positive), global gene expression changes were analyzed in AbP subjects with different T1D progression rate. Total RNA were obtained from peripheral blood mononuclear cells (PBMC) of total 36 AbP subjects with different T1D progression rate. Microarray was carried out to analyze gene expression and Kaplan-Meier survival analysis and log-rank test were used to compare differences in diabetes-free survival between groups classified based on single gene expression.

2014-04-10 | E-GEOD-51058 | biostudies-arrayexpress

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