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Comparative immune systems in animals.

Shaochun Yuan1, Xin Tao, Shengfeng Huang

  • 1State Key Laboratory of Biocontrol, National Engineering Center of South China Sea for Marine Biotechnology, Department of Biochemistry, College of Life Sciences, Sun Yat-sen (Zhongshan) University, Guangzhou 510275, People's Republic of China; email: yuanshch@mail.sysu.edu.cn , zsutx2005@163.com , hshengf2@mail.sysu.edu.cn , lsschshw@mail.sysu.edu.cn , lssxal@mail.sysu.edu.cn.

Annual Review of Animal Biosciences
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Summary

Discover the surprising complexity of animal immunity beyond the traditional innate and adaptive classifications. Recent findings reveal novel immune strategies in invertebrates and jawless vertebrates, challenging long-held evolutionary assumptions.

Keywords:
amphioxusdiversityevolutionexpansionimmunity

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Area of Science:

  • * Comparative immunology
  • * Evolution of immune systems

Background:

  • * Traditional view: innate immunity (universal, germline-encoded receptors, PAMPs recognition) and adaptive immunity (vertebrate-specific, lymphocytes, antigen receptors).
  • * Recent discoveries challenge this dichotomy, revealing novel immune mechanisms in diverse animal groups.

Purpose of the Study:

  • * To explore the expanding understanding of animal immune system diversity.
  • * To investigate the evolutionary origins and implications of novel immune findings in invertebrates and jawless vertebrates.

Main Methods:

  • * Review and synthesis of recent immunological research findings.
  • * Comparative analysis of immune gene families and receptor repertoires across different animal taxa.

Main Results:

  • * Identification of adaptive or adaptive-like immune features in invertebrates and jawless vertebrates.
  • * Discovery of highly complex innate immune systems with extensive gene expansions in cephalochordates (amphioxus) and echinoderms (sea urchin).

Conclusions:

  • * The traditional classification of animal immunity requires re-evaluation.
  • * Novel immune mechanisms in invertebrates provide insights into the evolution of vertebrate immunity.
  • * Further research into invertebrate immunity is crucial for understanding the broader evolutionary history of immune defenses.