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Related Experiment Videos

Potential opportunities and problems for genetically altered rumen microorganisms.

J B Russell1, D B Wilson

  • 1Agricultural Research Service, U.S. Department of Agriculture, Department of Animal Science, Ithaca, NY.

The Journal of Nutrition
|February 1, 1988
PubMed
Summary
This summary is machine-generated.

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Genetic engineering offers potential for rumen manipulation but faces challenges. Deleting genes may be more effective than adding them, though recolonization prevention is key for rumen function.

Area of Science:

  • Rumen microbiology
  • Genetic engineering
  • Animal nutrition

Background:

  • Rumen microbiologists are exploring genetic engineering to modify the rumen microbial ecosystem.
  • Current applications for enhancing ruminal performance via genetic engineering are limited.

Purpose of the Study:

  • To critically evaluate the potential and limitations of genetic engineering in manipulating the rumen microbial ecosystem.
  • To explore strategies for overcoming biological constraints in genetically modifying rumen microbes.

Main Methods:

  • Discusses the challenges of adding specific genes to rumen microorganisms, considering adaptation, species diversity, and complex interactions.
  • Proposes strategies for gene deletion to address practical issues like lactic acidosis and deamination, highlighting the need for selective recolonization prevention.

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  • Describes a specific strategy involving the transfer of acid-resistant cellulose genes into noncellulytic, acid-resistant rumen bacteria.

    • Main Results:

    • Adding genes is complicated by existing microbial adaptations, species diversity, and inter-species interactions.
    • Deleting genes may address issues like lactic acidosis but requires methods to prevent wild-type recolonization.
    • Genetic engineering shows promise for overcoming human-imposed limitations such as detoxification and adapting to novel feed materials.

    Conclusions:

    • Genetic engineering in the rumen presents significant challenges due to the complex microbial ecosystem.
    • Gene deletion strategies may be more beneficial than gene addition for certain practical problems.
    • The technology holds potential for addressing new limitations imposed on the rumen environment, such as detoxification and digestion of novel feedstuffs.