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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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Cell-to-cell variation in gene expression and the aging process.

Alexander R Mendenhall1,2, George M Martin3,4, Matt Kaeberlein3,4

  • 1Department of Laboratory Medicine and Pathology, School of Medicine, University of Washington, Seattle, WA, USA. alexworm@uw.edu.

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Summary
This summary is machine-generated.

Biological trait variation, including aging and disease, stems from differences in gene expression, not just DNA. This review explores nongenetic variation and its role in aging and disease vulnerability.

Keywords:
AgingCell-to-cellEpigeneticsGene expressionHeterogeneityLifespanNongeneticStochasticSystems biology

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Area of Science:

  • Genetics
  • Aging Research
  • Systems Biology

Background:

  • Significant biological variation exists beyond DNA sequence differences, impacting human diseases and lifespan.
  • Emerging evidence highlights variations in genetic program execution as a primary source of this nongenetic variation.
  • Gene expression variability is increasingly recognized as a fundamental biological property.

Purpose of the Study:

  • To review the historical context and current evidence for nongenetic variation.
  • To discuss methodologies for detecting nongenetic variation.
  • To explore the role of gene expression variation in aging and disease.

Main Methods:

  • Literature review and synthesis of existing research on gene expression variation.
  • Analysis of historical data and recent findings on nongenetic variation.
  • Examination of genetic and epigenetic control mechanisms of gene expression variation.

Main Results:

  • Nongenetic variation in gene expression is a significant contributor to phenotypic diversity.
  • The extent of gene expression variation can be both genetically programmed and epigenetically regulated.
  • Increased cell-to-cell variation in gene expression is observed during aging.

Conclusions:

  • Changes in gene expression variation are integral to the aging process.
  • Altered gene expression variability may link to age-related disease vulnerability.
  • Understanding gene expression variation is crucial for biomedical research and aging biology.