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The missing heritability in type 1 diabetes.

Haipeng Pang1, Jian Lin1, Shuoming Luo1

  • 1National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology (Central South University), Ministry of Education, and Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, Changsha, China.

Diabetes, Obesity & Metabolism
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PubMed
Summary

Type 1 diabetes (T1D) genetics research explores the

Keywords:
gene-environment interactionsgene-gene interactionsmissing heritabilityrare variantsstructural variantstype 1 diabetes

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Area of Science:

  • Immunology and Genetics
  • Complex Autoimmune Diseases
  • Metabolic Disorders

Background:

  • Type 1 diabetes (T1D) is an autoimmune disease causing absolute insulin deficiency, affecting millions globally.
  • While genetics and environment contribute to T1D, known genetic factors explain only 80-85% of heritability.
  • A 'missing heritability' gap persists, limiting clinical applications and understanding of T1D's origins.

Purpose of the Study:

  • To review and discuss potential sources of missing heritability in Type 1 diabetes.
  • To explore novel genetic insights into T1D etiology and identify potential therapeutic targets.

Main Methods:

  • Literature review of genetic studies in Type 1 diabetes.
  • Analysis of hypotheses explaining the 'missing heritability' phenomenon.
  • Discussion of gene-gene and gene-environment interactions, including epigenetics.

Main Results:

  • Identified over 60 T1D susceptible loci, but most variants have small effects.
  • Hypotheses for missing heritability include undiscovered variants (small effect, rare, structural) and interactions.
  • Epigenetic effects and gene-environment interactions are key areas for further T1D research.

Conclusions:

  • Further genetic research is crucial for understanding Type 1 diabetes etiology.
  • Elucidating T1D genetics can reveal novel therapeutic targets and improve patient outcomes.
  • Addressing the 'missing heritability' is key to advancing T1D research and treatment.