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Reconstructing Macroevolutionary Patterns in Avian MHC Architecture With Genomic Data.

Ke He1, Chun-Hong Liang1, Ying Zhu2

  • 1College of Animal Science and Technology, College of Veterinary Medicine, Zhejiang Agriculture and Forestry University, Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Hangzhou, China.

Frontiers in Genetics
|March 7, 2022
PubMed
Summary
This summary is machine-generated.

The avian Major Histocompatibility Complex (MHC) architecture evolved from a compact ancestral state. This study reveals key genomic rearrangements and selection pressures shaping bird immunity over 100 million years.

Keywords:
MHC architectureMHC gene structureavian MHCmacroevolutionarythird-generation sequencing genome

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Immunology

Background:

  • The Major Histocompatibility Complex (MHC) is vital for vertebrate adaptive immunity, crucial for pathogen recognition.
  • Understanding avian MHC gene structure evolution is limited despite advances in sequencing.

Purpose of the Study:

  • To explore macroevolutionary patterns in avian MHC architecture.
  • To investigate the evolutionary history of MHC gene structure in birds.

Main Methods:

  • Retrieved antigen-presenting MHC and related gene contigs from avian genomes using third-generation sequencing.
  • Analyzed genomic arrangement and gene copy number variations.

Main Results:

  • Identified an ancestral compact avian MHC architecture with tight gene linkage.
  • Described three major patterns of MHC-IIA/IIB unit organization across avian lineages.
  • Documented lineage-specific gene translocations, such as TAP gene separation in passerines.
  • Found a single MHC-IIA gene copy in most taxa, under strong purifying selection.

Conclusions:

  • Revealed long-term macroevolutionary patterns in avian MHC architecture.
  • Provided evidence for significant genomic transitions in the avian MHC region over the last 100 million years.