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Related Experiment Video

Updated: Oct 29, 2025

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Type 1 and Type 2 diabetes share etiological features, with genetic variants impacting common genes and pathways. Type 1 diabetes genetic risk profiles uniquely increase susceptibility to both diabetes types.

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Area of Science:

  • Genomics
  • Immunology
  • Metabolic Diseases

Background:

  • Type 1 diabetes (T1D) and Type 2 diabetes (T2D) are often considered genetically distinct, yet shared etiological features are suspected.
  • The genetic overlap and regulatory mechanisms linking T1D and T2D remain poorly understood.

Purpose of the Study:

  • To investigate shared genetic and regulatory mechanisms between T1D and T2D using an integrated functional genomics approach.
  • To identify pleiotropic genes and regulatory elements influencing both T1D and T2D risk.

Main Methods:

  • Utilized chromatin interaction (Hi-C) and expression quantitative trait loci (eQTL) data.
  • Analyzed tissue-specific impacts of single nucleotide polymorphisms associated with T1D and T2D.
  • Identified pleiotropic genes and regulatory elements, including those in the TCF7L2 locus.

Main Results:

  • Identified 195 pleiotropic genes modulated by tissue-specific spatial eQTLs for both T1D and T2D.
  • Pleiotropic genes are enriched in inflammatory and metabolic pathways, including MAPK and Parkinson's disease pathways.
  • Found 8 regulatory elements in the TCF7L2 locus affecting immune and T2D-related genes; no significant genetic correlation between variant effects on T1D and T2D risk was observed.

Conclusions:

  • Genetic variants for T1D and T2D may act via regulatory mechanisms to alter common genes and pathways, mediating pleiotropic effects.
  • A high-risk genetic profile for T1D increases susceptibility to both T1D and T2D, but not vice versa.
  • Findings provide a resource for understanding diabetes etiology and developing novel therapies.