Transgenic livestock: premises and promises

Area of Science:

• Animal Biotechnology
• Genetics
• Molecular Biology

Background:

• Microinjection into zygotes is the standard for transgenic livestock, but suffers from low efficiency (1-4%), random integration, and mosaicism.
• Current applications include producing recombinant proteins and xenotransplantation, with some success in improving livestock traits (e.g., pigs with hMt-pGH).

Purpose of the Study:

• To review the limitations of current transgenic livestock generation methods.
• To explore advanced molecular tools for precise genome modification in livestock.
• To discuss the potential of these tools for future applications.

Main Methods:

• Review of existing transgenic technologies and their limitations.
• Discussion of advanced molecular tools developed in mice, including YACs/BACs, Tet-system, and site-specific recombinases.
• Consideration of adapting these tools for livestock applications.

Main Results:

• Microinjection is inefficient, costly, and results in random transgene integration and variable expression.
• Advanced tools like YACs/BACs, Tet-system, and recombinases offer precise genomic control and expression regulation.
• Adaptation of these tools could significantly enhance the efficiency and applicability of transgenic livestock.

Conclusions:

• Current transgenic livestock generation methods require significant improvement in efficiency and precision.
• Advanced molecular tools hold great promise for overcoming existing limitations.
• Successful adaptation of these tools will unlock the full potential of transgenic livestock for various applications.