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Microbially experienced (ME) mice, exposed to pathogens, offer a more accurate model of the human immune system than standard specific pathogen-free (SPF) mice. The virome significantly influences immune development in these ME models.

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Area of Science:

  • Immunology
  • Microbiology
  • Animal Models

Background:

  • Specific pathogen-free (SPF) mice are standard in research but have limited translational relevance due to their sterile environment.
  • This sterile environment creates an immunological profile distinct from humans, impacting the validity of immune studies.
  • Microbially experienced (ME) mice, exposed to a broader range of microbes, are being explored as alternatives.

Purpose of the Study:

  • To review the immune implications of various microbially experienced (ME) mouse models.
  • To highlight the role of the virome in shaping immune responses in ME mice.
  • To assess the potential of ME models in better reflecting human immune system maturation.

Main Methods:

  • Review of existing literature on ME mouse models and their immunological outcomes.
  • Analysis of the impact of lifelong microbial exposure, including viral pathogens, on immune development.
  • Comparison of immune profiles in SPF, ME, and germ-free mouse models.

Main Results:

  • Lifelong microbial exposure in ME mice profoundly shapes immune development.
  • Persistent exposure to endemic viruses and pathogens contributes to sustained immune activation in ME mice.
  • The virome plays a critical role in aligning mouse immune responses with human responses.

Conclusions:

  • ME mouse models offer a more faithful representation of a mature, pathogen-shaped immune system compared to SPF models.
  • Harnessing microbial experience in mouse models can improve the translational relevance of immunological research.
  • The virome is a key factor to consider when utilizing ME mice for studying human immunity.