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Human immune diversity: from evolution to modernity.

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Human immune system diversity, shaped by evolution, protects against pathogens but also causes immune diseases. Genetic and environmental factors contribute to this variation, requiring multidisciplinary study for better understanding.

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Area of Science:

  • Immunology
  • Human Genetics
  • Evolutionary Biology

Background:

  • The human immune system exhibits extreme diversity, crucial for pathogen defense but also implicated in immune-associated diseases.
  • Genetic factors, including Neanderthal/Denisovan introgression, significantly contribute to immune variation, maintained by intense evolutionary selection.
  • Factors like age, sex, diet, environment, and microbiome also influence immune variation, though their precise contributions are complex and interactive.

Purpose of the Study:

  • To review the current understanding of human immune variation.
  • To identify key unknowns in the causal factors driving immune variation.
  • To outline multidisciplinary approaches for a comprehensive understanding of immune diversity.

Main Methods:

  • Review of genetic analyses identifying loci contributing to immune variation.
  • Examination of evolutionary selection pressures maintaining immune diversity.
  • Synthesis of evidence from studies on environmental and lifestyle factors influencing immune variation.

Main Results:

  • Genetic analysis indicates thousands of loci collectively explain up to half of immune variation.
  • Intense selection preserves genetic diversity, including archaic introgression.
  • Environmental and lifestyle factors explain residual variation, but their interactions complicate definitive attribution.

Conclusions:

  • Human immune variation is a complex interplay of genetics, evolution, and environmental factors.
  • Understanding the causality of immune variation requires integrating diverse data and methodologies.
  • Further multidisciplinary research is essential to fully elucidate the drivers of immune diversity and its implications for health and disease.