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Major Histocompatibility Complex in Osteichthyes.

Michał Stosik1, Beata Tokarz-Deptuła2, Wiesław Deptuła3

  • 1Institute of Biological Sciences, University of Zielona Góra, 65-516 Zielona Góra, Poland.

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|April 8, 2020
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Summary

Five MHC class I and one MHC class II gene lineages were identified in Osteichthyes. MHC II genes show three sublineages, with A and B potentially evolving from an ancestral A/B type found in spotted gar.

Keywords:
Osteichthyesmajor histocompatibility complex

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Area of Science:

  • Immunogenetics
  • Evolutionary Biology
  • Comparative Genomics

Background:

  • The Major Histocompatibility Complex (MHC) plays a crucial role in adaptive immunity across vertebrates.
  • Understanding MHC gene organization and evolution in Osteichthyes (bony fishes) is vital for comparative immunology.

Purpose of the Study:

  • To identify and characterize MHC class I and class II gene lineages in Osteichthyes.
  • To investigate the evolutionary relationships among identified MHC gene lineages.

Main Methods:

  • Analysis of available genome sequences from various fish species.
  • Phylogenetic studies of MHC class I and class II molecule genes.

Main Results:

  • Five MHC class I gene lineages (MHC I-U, -Z, -S, -L, -P) and one MHC class II lineage (MHC II-D) were identified in Osteichthyes.
  • MHC II-D further resolved into three sublineages: MHC II-A, -B, and -E.
  • MHC I-U and -Z lineages are highly conserved across fish species.
  • Phylogenetic analysis suggests MHC II-A and -B sublineages may originate from an ancestral A/B type found in spotted gar.
  • MHC II-E genes, characterized by low polymorphism and expression, are found in primitive fish and some teleosts.

Conclusions:

  • The identified MHC gene lineages provide a framework for understanding immune system evolution in bony fishes.
  • Further research into MHC organization and function in Osteichthyes will enhance our knowledge of MHC evolution and immune mechanisms.