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Related Experiment Videos

Modification of milk composition.

I Wilmut1, A L Archibald, S Harris

  • 1AFRC Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, Roslin, Midlothian, UK.

Journal of Reproduction and Fertility. Supplement
|January 1, 1990
PubMed
Summary
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Gene transfer enables modification of milk composition for producing therapeutic proteins. While early attempts yielded low concentrations, genomic clones show promise for higher yields and diverse applications.

Area of Science:

  • Biotechnology
  • Genetics
  • Molecular Biology

Background:

  • Gene transfer and targeted gene mutation technologies offer novel ways to alter milk composition.
  • Understanding tissue-specific gene expression in mammary glands is crucial for these modifications.

Purpose of the Study:

  • To explore the potential of using gene transfer in milk for producing valuable proteins.
  • To investigate methods for increasing the concentration and efficacy of these proteins in milk.

Main Methods:

  • Fusion of ovine beta-lactoglobulin gene fragments with cDNA for human therapeutic proteins (clotting factor IX, alpha-1 antitrypsin).
  • Utilizing genomic clones of milk protein genes for enhanced protein production.
  • Generating transgenic mice and sheep to express these fusion genes in their milk.

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Main Results:

  • Transgenic mice and sheep produced human clotting factor IX and alpha-1 antitrypsin in their milk.
  • Factor IX was biologically active but at concentrations too low for commercial use.
  • Genomic clones demonstrated potential for higher protein concentrations compared to cDNA fusions.

Conclusions:

  • Gene transfer into milk provides a viable platform for producing therapeutic and industrial proteins.
  • Further optimization using genomic sequences is needed to achieve commercially relevant concentrations.
  • This technology can be applied to modify milk composition for various applications, including disease prevention.