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Related Experiment Videos

Isolation of a hagfish gene that encodes a complement component.

H Ishiguro1, K Kobayashi, M Suzuki

  • 1Institute for Comprehensive Medical Science, Fujita Health University, Aichi, Japan.

The EMBO Journal
|March 1, 1992
PubMed
Summary

Hagfish possess a unique complement system gene, not true antibodies, challenging their status as primitive antibody producers. This finding redefines our understanding of early vertebrate immune evolution.

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Area of Science:

  • Immunology
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Cyclostomes, including hagfish, are considered the most primitive vertebrates with antibody production capabilities.
  • Previous research identified hagfish 'antibodies' but their true nature remained unclear.

Purpose of the Study:

  • To isolate and characterize cDNA clones encoding putative antibodies in the hagfish Eptatretus burgeri.
  • To compare the identified gene sequences with known antibody and complement genes in higher vertebrates.

Main Methods:

  • cDNA cloning from Eptatretus burgeri.
  • Nucleotide sequencing of isolated cDNA clones.
  • Amino acid sequence prediction and comparison with protein databases.

Main Results:

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  • Isolated cDNA clones encode proteins previously identified as hagfish 'antibodies'.
  • These proteins show no similarity to mammalian immunoglobulins.
  • The proteins share characteristics with complement components C3, C4, and C5 found in higher vertebrates.

Conclusions:

  • The isolated gene in hagfish encodes a complement protein, not an antibody.
  • This challenges the long-held view of cyclostomes as primitive antibody producers.
  • Further investigation is needed to determine the presence of true antibodies in cyclostomes.