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Related Concept Videos

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 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.
Diabetes Mellitus: Type 2 and Gestational01:22

Diabetes Mellitus: Type 2 and Gestational

Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...
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 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...
Type II Diabetes Mellitus III: Clinical Manifestations and Diagnosis01:25

Type II Diabetes Mellitus III: Clinical Manifestations and Diagnosis

Type 2 diabetes mellitus develops gradually and is often asymptomatic in early stages.Clinical ManifestationsWhen symptoms appear, they include fatigue, blurred vision, pruritus, delayed wound healing, and recurrent infections, particularly candidal infections. Peripheral neuropathy may present as numbness or tingling in the extremities. Classic hyperglycemia symptoms—polyuria, polydipsia, and polyphagia—are less common. Most patients are overweight and frequently have associated hypertension...

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Generation of High Quality Chromatin Immunoprecipitation DNA Template for High-throughput Sequencing (ChIP-seq)
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Familial risks for type 2 diabetes in Sweden.

Kari Hemminki1, Xinjun Li, Kristina Sundquist

  • 1Division of Molecular Genetic Epidemiology, German Cancer Research Center, Heidelberg, Germany. k.hemminki@dkfz.de

Diabetes Care
|November 12, 2009
PubMed
Summary

Familial type 2 diabetes risk increases with more affected relatives, especially siblings. Genetic factors dominate, but environmental influences play a minor role, as seen in adoptee and half-sibling data.

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Area of Science:

  • Diabetes research
  • Genetics and epidemiology
  • Public health

Background:

  • Type 2 diabetes exhibits significant familial clustering.
  • Understanding familial risk is crucial for genetic counseling and prevention strategies.

Purpose of the Study:

  • To characterize familial risks for type 2 diabetes based on the number and type of affected relatives.
  • To quantify these risks and estimate the contribution of environmental factors.

Main Methods:

  • Utilized data from the Multigeneration Register and Hospital Discharge Register.
  • Calculated standardized incidence ratios for offspring with type 2 diabetes.
  • Compared risk in individuals with affected family members versus those without.

Main Results:

  • Familial relative risks (RR) ranged from 2.0 to over 30, varying by number and type of affected relatives.
  • Individuals with at least two affected siblings showed the highest RR for type 2 diabetes.
  • Adoptees did not show increased risk from adopted parents, supporting a genetic basis.

Conclusions:

  • Familial clustering of type 2 diabetes is substantial and varies significantly.
  • Genetic factors appear to be the primary driver of familial risk.
  • Environmental factors contribute minimally, as suggested by adoptee and half-sibling data.