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Related Concept Videos

Type I Diabetes I: Introduction01:12

Type I Diabetes I: Introduction

Type 1 diabetes mellitus is a chronic metabolic disorder characterized by an absolute deficiency of insulin resulting from the autoimmune destruction of pancreatic β-cells. Although it can occur at any age, it is most commonly diagnosed in childhood, adolescence, or early adulthood. The loss of insulin production impairs cellular glucose uptake, resulting in persistent hyperglycemia and necessitating lifelong insulin therapy.Autoimmune Destruction of β-CellsThe hallmark of type 1 diabetes is an...
Type II Diabetes I: Introduction01:26

Type II Diabetes I: Introduction

Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
Type I Diabetes II: Pathophysiology01:26

Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
Gene-Environment Interactions01:20

Gene-Environment Interactions

Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Type II Diabetes II: Pathophysiology01:24

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.

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Updated: Jul 15, 2026

Accelerated Type 1 Diabetes Induction in Mice by Adoptive Transfer of Diabetogenic CD4+ T Cells
06:27

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Published on: May 6, 2013

Genes mediating environment interactions in type 1 diabetes.

Erik Biros1, Margaret A Jordan, Alan G Baxter

  • 1Comparative Genomics Centre, Molecular Sciences Building 21, James Cook University, Townsville QLD 4811, Australia.

The Review of Diabetic Studies : RDS
|May 12, 2007
PubMed
Summary

Type 1 diabetes has a strong genetic link, but environmental factors are rapidly increasing its incidence. Research explores how genetics and environment interact, focusing on pathogen recognition molecules like toll-like receptors.

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Last Updated: Jul 15, 2026

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Published on: May 6, 2013

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Area of Science:

  • Immunology
  • Genetics
  • Epidemiology

Background:

  • Type 1 diabetes exhibits a significant genetic predisposition, with sibling risk 15 times higher than the general population.
  • The incidence of type 1 diabetes has doubled every 15 years post-WWII, suggesting a major environmental etiological role.
  • Understanding the interplay between genetic susceptibility and environmental triggers is crucial for disease etiology.

Purpose of the Study:

  • To review identified risk factors for type 1 diabetes.
  • To explore the integration of genetic and environmental influences on type 1 diabetes development.
  • To discuss recent findings linking type 1 diabetes to pathogen pattern recognition molecules.

Main Methods:

  • Selective literature review of identified type 1 diabetes risk factors.
  • Discussion of genetic linkage studies, particularly involving toll-like receptors.
  • Synthesis of current hypotheses on gene-environment interaction in type 1 diabetes.

Main Results:

  • Genetic factors confer a substantially higher risk for siblings of affected individuals.
  • Rapidly increasing incidence rates point to significant environmental contributions.
  • Emerging evidence links type 1 diabetes susceptibility to genes like toll-like receptors.

Conclusions:

  • Type 1 diabetes arises from a complex interplay between genetic susceptibility and environmental exposures.
  • Pathogen pattern recognition molecules offer a potential mechanism for integrating genetic and environmental signals in disease pathogenesis.
  • Further research is needed to elucidate the precise mechanisms driving type 1 diabetes etiology.