Immunogenetics

, Volume 66, Issue 1, pp 53–65

Evolution of MHC class I in the Order Crocodylia

  • Weerachai Jaratlerdsiri
  • Sally R. Isberg
  • Damien P. Higgins
  • Simon Y. W. Ho
  • Jan Salomonsen
  • Karsten Skjodt
  • Lee G. Miles
  • Jaime Gongora
Original Paper

Abstract

The major histocompatibility complex (MHC) is a dynamic genomic region with an essential role in the adaptive immunity of jawed vertebrates. The evolution of the MHC has been dominated by gene duplication and gene loss, commonly known as the birth-and-death process. Evolutionary studies of the MHC have mostly focused on model species. However, the investigation of this region in non-avian reptiles is still in its infancy. To provide insights into the evolutionary mechanisms that have shaped the diversity of this region in the Order Crocodylia, we investigated MHC class I exon 3, intron 3, and exon 4 across 20 species of the families Alligatoridae and Crocodilidae. We generated 124 DNA sequences and identified 31 putative functional variants as well as 14 null variants. Phylogenetic analyses revealed three gene groups, all of which were present in Crocodilidae but only one in Alligatoridae. Within these groups, variants generally appear to cluster at the genus or family level rather than in species-specific groups. In addition, we found variation in gene copy number and some indication of interlocus recombination. These results suggest that MHC class I in Crocodylia underwent independent events of gene duplication, particularly in Crocodilidae. These findings enhance our understanding of MHC class I evolution and provide a preliminary framework for comparative studies of other non-avian reptiles as well as diversity assessment within Crocodylia.

Keywords

MHC class I Crocodilidae Alligatoridae MHC evolution Balancing selection Recombination 

Supplementary material

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Weerachai Jaratlerdsiri
    • 1
  • Sally R. Isberg
    • 1
    • 2
  • Damien P. Higgins
    • 1
  • Simon Y. W. Ho
    • 3
  • Jan Salomonsen
    • 4
  • Karsten Skjodt
    • 4
  • Lee G. Miles
    • 1
  • Jaime Gongora
    • 1
  1. 1.Faculty of Veterinary ScienceUniversity of SydneySydneyAustralia
  2. 2.Porosus Pty. LtdPalmerstonAustralia
  3. 3.School of Biological SciencesUniversity of SydneySydneyAustralia
  4. 4.Institute of Molecular MedicineUniversity of Southern DenmarkOdenseDenmark

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