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Related Concept Videos

Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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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Related Experiment Video

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Human Brown Adipose Tissue Depots Automatically Segmented by Positron Emission Tomography/Computed Tomography and Registered Magnetic Resonance Images
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Gene expression in human brown adipose tissue.

Per-Arne Svensson1, Margareta Jernås, Kajsa Sjöholm

  • 1Sahlgrenska Center for Cardiovascular and Metabolic Research, Department of Molecular and Clinical Medicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. per-arne.svensson@gu.se

International Journal of Molecular Medicine
|December 3, 2010
PubMed
Summary

Human adults possess brown adipose tissue (BAT), a key metabolic regulator. This study identified novel genes in human BAT, revealing species-specific differences crucial for understanding human metabolism and heat production.

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Area of Science:

  • Metabolic research
  • Adipose tissue biology
  • Gene expression analysis

Background:

  • Brown adipose tissue (BAT) plays a significant role in body weight and metabolism.
  • Recent findings indicate the presence of substantial BAT in adult humans.
  • Understanding human BAT's molecular profile is essential for metabolic research.

Purpose of the Study:

  • To investigate the gene expression profile of human brown adipose tissue (BAT).
  • To identify genes differentially expressed between human BAT and white adipose tissue (WAT).
  • To compare human BAT gene expression with that of mouse BAT.

Main Methods:

  • Biopsies of human BAT and WAT were collected from patients.
  • Murine BAT and WAT samples were obtained for comparison.
  • Gene expression was analyzed using DNA microarray, real-time PCR, and immunohistochemistry.

Main Results:

  • Approximately half of human brown-red adipose tissue samples contained BAT, confirmed by histology and UCP1 expression.
  • Seventeen genes showed significantly higher expression in human BAT compared to WAT, with five validated by real-time PCR.
  • Human BAT overexpressed specific genes (e.g., CKMT1, KCNK3, COBL, HMGCS2, TGM2) not found to be overexpressed in mouse BAT.

Conclusions:

  • This study identified novel differentially expressed genes in human BAT.
  • Significant species-specific differences exist in BAT gene expression between humans and mice.
  • Further molecular characterization of human BAT is necessary to elucidate mechanisms of regulated heat production.