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Evolution of the complement system.

Masaru Nonaka1, Fumiko Yoshizaki

  • 1Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan. mnonaka@biol.s.u-tokyo.ac.jp

Molecular Immunology
|December 31, 2003
PubMed
Summary
This summary is machine-generated.

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The human complement system evolved in deuterostomes, with gene duplications occurring independently in ascidian and vertebrate lineages. The vertebrate system integrates diverse components, unlike the ascidian system.

Area of Science:

  • Immunology
  • Evolutionary Biology
  • Genomics

Background:

  • The human complement system comprises over 30 serum and cell surface proteins, many with distinct domain structures.
  • Domain structures allow for tracing the evolutionary history of complement genes.

Purpose of the Study:

  • To investigate the evolutionary origins and development of the complement system.
  • To compare the complexity and domain structures of complement systems across different lineages.

Main Methods:

  • Comparative genomics analysis of vertebrate and invertebrate genomes.
  • Phylogenetic analysis of complement component genes.
  • Examination of domain structures within complement proteins.

Main Results:

Related Experiment Videos

  • Most domains in mammalian complement components are present in both protostomes and deuterostomes.
  • Unique combinations of these domains are exclusive to deuterostomes, suggesting the system's origin in this lineage.
  • Ascidians possess a complement system of comparable complexity to mammals, but gene expansion occurred independently.
  • While domain structures overlap, detailed analysis questions the functional homology between ascidian and mammalian components.

Conclusions:

  • The complement system originated within the deuterostome lineage.
  • Independent gene duplication events shaped the complement systems in ascidians and vertebrates.
  • The vertebrate complement system likely arose from the integration of previously independent functional parts.