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Coexpression within Integrated Mitochondrial Pathways Reveals Different Networks in Normal and Chemically Treated

Cong Chen1, Tae Kyung Hyun2, Xiao Han2

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Area of Science:

  • Cellular Biology
  • Mitochondrial Function
  • Systems Biology

Background:

  • Mitochondria are crucial cellular energy producers.
  • Differential expression of mitochondrial respiratory complexes (MRCs) impacts mitochondrial function.
  • The integrated role of MRCs within coexpression networks remains underexplored.

Purpose of the Study:

  • To construct coexpression networks to investigate the role of integrated MRCs.
  • To explore the effects of chemical treatments on the mitochondrial coexpression network.
  • To identify genes significantly coexpressed with MRCs.

Main Methods:

  • Microarray datasets from various tissues and chemical treatments were utilized.
  • Coexpression networks were constructed.
  • Hypergeometric distribution was applied to identify coexpressed genes with MRCs grouped as a seed target.

Main Results:

  • Significant coexpression was observed among 78% of tested MRC genes in normal tissue transcriptomes.
  • MRC genes coexpressed with genes related to muscle system process, metabolic process, and neurodegenerative disease pathways.
  • Chemical treatments largely abolished the coexpression of MRC genes, indicating disruption of the normal network.

Conclusions:

  • Chemical stimuli significantly alter the normal coexpression network of MRC genes.
  • Coexpression network analysis provides insights into mitochondrial biogenesis.
  • Findings contribute to understanding drug side effects on mitochondrial function.