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Diabetes Mellitus: Overview and Type I Subtype01:22

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Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
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Characterizing Circulating microRNA Signatures of Type 2 Diabetes Subtypes.

Fatima Sulaiman1, Costerwell Khyriem1, Stafny Dsouza1

  • 1College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai P.O. Box 505055, United Arab Emirates.

International Journal of Molecular Sciences
|January 25, 2025
PubMed
Summary

Type 2 diabetes (T2D) subtypes show unique circulating microRNA (miRNA) expression profiles. This epigenetic distinction highlights miRNAs as potential biomarkers for understanding T2D heterogeneity and pathophysiology.

Keywords:
T2D subtypesType 2 diabetescirculating microRNAinsulin resistancepathophysiology

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Area of Science:

  • Endocrinology and Metabolism
  • Molecular Biology
  • Genetics

Background:

  • Type 2 diabetes (T2D) is a complex, heterogeneous disease influenced by genetic and environmental factors.
  • Emerging evidence suggests distinct gene expression profiles across T2D subtypes.
  • Understanding these epigenetic differences is crucial for personalized medicine.

Purpose of the Study:

  • To identify specific microRNA (miRNA) expression signatures for five previously defined T2D clinical subtypes.
  • To investigate the epigenetic basis of T2D heterogeneity.
  • To explore the potential of circulating miRNAs as biomarkers for T2D pathophysiology.

Main Methods:

  • Single-end small RNA sequencing of circulating miRNAs from 45 T2D subjects across five subtypes (SIRD, SIDD, MARD, MOD, MEOD) and 7 healthy controls.
  • Bioinformatic analysis to identify known and novel circulating miRNAs.
  • Differential expression analysis to compare miRNA profiles between T2D subtypes and controls.

Main Results:

  • Identification of 430 known and 13 novel circulating miRNAs.
  • 71 miRNAs were upregulated and 37 downregulated in T2D subtypes compared to controls.
  • Each T2D subtype exhibited a unique, dysregulated miRNA profile, with specific miRNAs uniquely associated with SIRD, MARD, MOD, and MEOD.
  • Distinct patterns of upregulated and downregulated miRNAs were observed for SIRD, SIDD, MARD, and MEOD.

Conclusions:

  • Confirms the significant clinical and epigenetic heterogeneity of Type 2 Diabetes.
  • Demonstrates that circulating miRNA expression profiles are distinct for each T2D subtype.
  • Highlights the potential utility of miRNAs as diagnostic and prognostic biomarkers for differentiating T2D pathophysiology.