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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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Related Experiment Video

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Human Subcutaneous Adipose Tissue Sampling Using a Mini-Liposuction Technique
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Gene expression regional differences in human subcutaneous adipose tissue.

Angelina Passaro1,2, Maria Agata Miselli3,4, Juana Maria Sanz4

  • 1Azienda Ospedaliero Universitaria di Ferrara, Ferrara, Italy. psn@unife.it.

BMC Genomics
|February 25, 2017
PubMed
Summary

Visceral adipose tissue (VAT) increases disease risk, while gluteal subcutaneous fat (g-SAT) is protective. Abdominal subcutaneous fat (a-SAT) gene expression differs from g-SAT, with a-SAT showing similarities to VAT, suggesting distinct roles in metabolic health.

Keywords:
Adipose tissueHomeobox genesMicroarrayObesitySATVAT

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Area of Science:

  • Adipose tissue biology
  • Molecular genetics
  • Human physiology

Background:

  • Visceral adipose tissue (VAT) accumulation is linked to increased disease risk and mortality.
  • Gluteal subcutaneous fat (g-SAT) accumulation is associated with lower health risks.
  • Abdominal subcutaneous adipose tissue (a-SAT) roles in cardiovascular risk are debated, with distinct adipocyte characteristics observed across depots.

Purpose of the Study:

  • To investigate the heterogeneity between different subcutaneous adipose tissue regions.
  • To compare global mRNA expression profiles of g-SAT and a-SAT.
  • To identify potential molecular differences underlying the distinct metabolic roles of adipose depots.

Main Methods:

  • Collected RNA from g-SAT and a-SAT biopsies of eight healthy subjects.
  • Utilized microarray analysis to study global mRNA expression.
  • Analyzed gene expression differences between a-SAT and g-SAT.

Main Results:

  • Identified 131 genes with significantly different expression (>1.5 fold change, p < 0.05) between a-SAT and g-SAT.
  • Observed significant differences in the expression of several Homeobox (HOX) genes.
  • Found HOXA5 and NR2F1, markers of visceral adipocyte lineage, upregulated in a-SAT compared to g-SAT (2.5 fold change).

Conclusions:

  • g-SAT and a-SAT exhibit distinct gene expression profiles.
  • Differential HOX gene expression suggests early regional differentiation of subcutaneous adipose depots.
  • Higher expression of HOXA5 and NR2F1 in a-SAT indicates it may be more similar to VAT than g-SAT, implying distinct roles in metabolic complications.