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Bovine NK-lysin: Copy number variation and functional diversification.

Junfeng Chen1, John Huddleston2, Reuben M Buckley3

  • 1Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843;

Proceedings of the National Academy of Sciences of the United States of America
|December 16, 2015
PubMed
Summary

Cattle possess four functional NK-lysin genes, unlike other mammals with a single gene. These bovine NK-lysins effectively combat bacteria by disrupting cell membranes, enhancing innate immunity.

Keywords:
NK-lysinantimicrobial peptidescopy number polymorphismgene family expansionsegmental duplication

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Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • NK-lysin is a key antimicrobial peptide in the innate immune system.
  • Most mammals have a single NK-lysin gene, but its evolution in ruminants is less understood.

Purpose of the Study:

  • To identify and characterize NK-lysin genes in cattle.
  • To investigate the function and expression of these bovine NK-lysin genes.

Main Methods:

  • Gene identification using cattle chromosome 11 mapping.
  • Analysis of gene structure and tandem duplication.
  • Quantitative assessment of tissue-specific gene expression.
  • Ex vivo synthesis and antimicrobial activity assays of NK-lysin peptides.
  • Transmission electron microscopy to visualize membrane disruption.

Main Results:

  • Four functional NK-lysin genes (NK1, NK2A, NK2B, NK2C) were identified on cattle chromosome 11.
  • Genes NK2A, NK2B, and NK2C are tandemly arrayed upstream of NK1.
  • Differential tissue expression observed, with highest levels in Peyer's patch (NK1, NK2A, NK2B) and lung (NK2C).
  • Synthesized bovine NK-lysins demonstrated potent antimicrobial activity against Gram-positive and Gram-negative bacteria.
  • Microscopy confirmed NK-lysins act by causing lytic damage to bacterial cell membranes.

Conclusions:

  • Cattle exhibit a unique four-member NK-lysin gene family, expanded via tandem duplications.
  • All four genes are transcribed, producing biologically active antimicrobial peptides.
  • Bovine NK-lysins play a significant role in ruminant innate immunity through membrane lysis.