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Cell Specific Gene Expression01:58

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
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Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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Insulin: Biosynthesis, Chemistry, and Preparation01:25

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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
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A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
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Epigenetic control of β-cell function and failure.

Diana Bernstein1, Maria L Golson1, Klaus H Kaestner1

  • 1Department of Genetics and Institute for Diabetes, Obesity and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

Diabetes Research and Clinical Practice
|December 6, 2016
PubMed
Summary
This summary is machine-generated.

Type 2 diabetes heritability is not fully explained by genetics alone. Epigenetic inheritance and environmental factors play crucial roles in diabetes development and transmission.

Keywords:
DiabetesEpigeneticsMethylomeβ-cell

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Area of Science:

  • Endocrinology
  • Genetics
  • Environmental Health

Background:

  • Type 2 diabetes exhibits high heritability, yet identified genetic variants explain only a small fraction.
  • Body mass index is a stronger predictor of type 2 diabetes than common genetic risk alleles.
  • A significant portion of diabetes heritability remains unexplained by current genetic discoveries.

Purpose of the Study:

  • To explore the role of epigenetic inheritance in type 2 diabetes.
  • To understand how environmental factors influence epigenetic modifications and diabetes susceptibility.
  • To investigate the interplay between genetics, epigenetics, and environment in diabetes.

Main Methods:

  • Utilizing novel genome-wide assays for epigenetic marks.
  • Analyzing epigenetic changes influenced by environmental factors (e.g., diet, chemical exposures).
  • Examining the inheritance patterns of epigenetic modifications.

Main Results:

  • Epigenetic inheritance offers a potential explanation for the missing heritability in type 2 diabetes.
  • Environmental exposures throughout life can alter gene expression via epigenetic mechanisms.
  • Genome-wide epigenetic analyses reveal complex interactions influencing diabetes risk.

Conclusions:

  • Genetics alone do not fully account for type 2 diabetes heritability.
  • Epigenetic modifications, influenced by environment and heritable, are critical in diabetes etiology.
  • Understanding these interactions is key to deciphering diabetes development and inheritance.