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Transcript Expression Profiles and MicroRNA Regulation Indicate an Upregulation of Processes Linked to Oxidative

Paula Takahashi1, Danilo J Xavier1, Jessica E B F Lima1

  • 1Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, 14049900, SP, Brazil.

Journal of Diabetes Research
|February 14, 2022
PubMed

Insights

Type 1 diabetes (T1D) involves oxidative stress and DNA damage. This study found altered gene expression and microRNA targets in T1D patients, highlighting their role in disease pathogenesis.

Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Type 1 diabetes (T1D) results from autoimmune destruction of insulin-producing beta-cells, causing hyperglycemia.
  • T1D is associated with DNA damage, oxidative stress, and inflammation, but the roles of oxidative stress response and DNA repair are not fully understood.

Purpose of the Study:

  • To investigate mRNA expression profiles in peripheral blood mononuclear cells (PBMCs) of T1D patients compared to controls.
  • To identify microRNA (miRNA) targets involved in T1D pathogenesis.

Main Methods:

  • Microarray analysis of PBMCs from 19 T1D patients and 11 controls.
  • Gene Set Analysis (GSA) and Gene Set Enrichment Analysis (GSEA).
  • Quantitative real-time PCR (qRT-PCR) for validation.

Main Results:

  • 277 differentially expressed genes identified in T1D patients (220 upregulated, 57 downregulated).
  • Upregulation of processes including ROS generation, oxidative stress, inflammation, cell death, ER stress, and DNA repair.
  • Identified key oxidative stress and DNA repair genes (PTGS2, ATF3, FOSB, DUSP1, TNFAIP3) as targets of four miRNAs (hsa-miR-101, hsa-miR148a, hsa-miR-27b, hsa-miR-424).

Conclusions:

  • Differential gene expression profiles in T1D PBMCs reveal significant biological functions related to oxidative stress, DNA repair, inflammation, and apoptosis.
  • Novel insights into miRNA-mRNA interactions suggest their potential importance in T1D pathogenesis.

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