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Comparing gene pathway conservation across species, this study reveals which animal models (mouse, rat, pig) best mimic human tissue expression for specific molecular pathways, aiding disease research.

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Area of Science:

  • Biomedical research
  • Comparative genomics
  • Systems biology

Background:

  • Animal models are vital for understanding human disease molecular pathways.
  • Significant gaps exist in knowledge regarding cross-species conservation of tissue-specific pathway expression.
  • Organism-specific pathway data for animal models is often limited.

Purpose of the Study:

  • To assess the conservation of human molecular pathways in animal models (mouse, rat, pig) at the tissue expression level.
  • To leverage publicly available data to approximate animal pathway activity by integrating human pathways with animal tissue expression data.
  • To identify which animal model most accurately reflects human tissue expression for specific pathways.

Main Methods:

  • Integrated human KEGG pathways with tissue expression data from mouse, rat, and pig.
  • Compared the tissue-specific expression of human gene orthologs across the three animal models.
  • Accounted for variations in data quality and coverage, particularly for rat and pig.
  • Systematically compared 203 human KEGG pathways across seven tissues with the best experimental coverage.

Main Results:

  • Identified 95 distinct pathways where tissue expression in at least one animal model showed better agreement with human data than the others.
  • Highlighted specific similarities and differences in pathway-tissue expression between human and the studied animal models.
  • Demonstrated variability in data quality and coverage across species, impacting comparative analysis.

Conclusions:

  • The study provides a systematic comparison of human and animal pathway-tissue expression, identifying model-specific congruencies.
  • Results suggest distinct strengths and weaknesses of mouse, rat, and pig models for specific human pathway research.
  • This work aids in selecting the most appropriate animal model for studying particular human diseases or biological processes.