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Related Experiment Videos

Engineering disease resistant cattle.

David M Donovan1, David E Kerr, Robert J Wall

  • 1Biotechnology and Germplasm Laboratory, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland 20705, USA.

Transgenic Research
|October 26, 2005
PubMed
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Transgenic dairy cows engineered to produce lysostaphin in milk resist Staphylococcus aureus infections, a major cause of mastitis. This innovation offers a novel strategy to combat bovine mastitis, protecting cattle health and dairy industry economics.

Area of Science:

  • Animal Biotechnology
  • Veterinary Medicine
  • Molecular Biology

Background:

  • Mastitis poses significant economic challenges to the global dairy industry, with limited effective treatments.
  • Bovine mastitis is primarily caused by bacterial pathogens, notably Staphylococcus aureus, entering the mammary gland via the teat canal.
  • Current strategies for mastitis control, including treatments and breeding for resistance, are insufficient.

Purpose of the Study:

  • To develop a novel approach for mastitis prevention in dairy cattle using genetic engineering.
  • To assess the efficacy of lysostaphin expression in transgenic dairy cows for combating Staphylococcus aureus.
  • To establish a foundation for future advancements in disease resistance in livestock.

Main Methods:

  • Creation of transgenic dairy cows expressing the antimicrobial peptide lysostaphin in mammary epithelial cells.

Related Experiment Videos

  • Secretion of lysostaphin into milk by the transgenic cows.
  • Challenge studies involving Staphylococcus aureus to evaluate resistance in transgenic cattle.

    • Main Results:

    • Transgenic dairy cows demonstrated resistance to Staphylococcus aureus mammary gland challenges.
    • Milk from these cows exhibited dose-dependent bactericidal activity against Staphylococcus aureus.
    • Lysostaphin expression effectively protected against a major mastitis pathogen.

    Conclusions:

    • Transgenic technology can be effectively employed to confer disease resistance in agriculturally important species.
    • Lysostaphin-producing transgenic cattle represent a promising first step towards controlling mastitis.
    • Further genetic modifications are planned to broaden protection against other mastitis-causing organisms and potential resistance issues.