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Transgenic modification of cows milk for value-added processing
1Lactation Department, Victorian Institute of Animal Science, Attwood, Australia.
Reproduction, Fertility, and Development
|December 28, 1999
Summary
Researchers aim to enhance dairy cattle production by genetically modifying casein genes. They are cloning the casein locus into bacterial artificial chromosomes (BACs) for improved milk processing and economic value.
Area of Science:
- Animal Genetics
- Molecular Biology
- Biotechnology
Background:
- Transgenic technology in dairy cattle is mainly used for pharmaceuticals, limiting broader applications.
- Economically important traits amenable to genetic modification are crucial for advancing dairy production.
- Casein proteins are key components of milk for value-added processing.
Purpose of the Study:
- To clone the entire bovine casein gene locus into a bacterial artificial chromosome (BAC) vector.
- To preserve the integrity and regulatory elements of the casein gene locus for coordinated expression.
- To establish proof of concept for using BAC casein constructs in dairy cattle improvement.
Main Methods:
- Construction of a bacterial artificial chromosome (BAC) library from elite dairy cattle genomic DNA.
- Cloning of the multi-gene casein locus, including extended 5' and 3' flanking regions.
- Testing of partial BAC clones in transgenic mice to validate proof of concept.
Main Results:
- A BAC library from elite dairy cattle has been successfully prepared.
- Partial BAC clones of the casein gene locus are undergoing testing in transgenic mice.
- The research is laying the groundwork for improved transgenic approaches in dairy cattle.
Conclusions:
- Cloning the entire casein locus in a BAC vector is feasible and essential for future transgenic applications.
- Transgenic mice studies will provide critical proof of concept for casein gene locus manipulation.
- Advances in nuclear transfer offer potential for efficient production of improved transgenic dairy cattle.
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