Efficient Method for Liposome-Based Gene Transfer in Cattle Embryos

Area of Science:

• Reproductive Biology
• Molecular Genetics
• Animal Biotechnology

Background:

• In vitro embryo production (IVP) is vital for cattle genetic enhancement and lineage preservation.
• Efficient delivery of genetic material is essential for modifying cattle embryos.
• Current methods face challenges in optimizing gene manipulation and embryo development.

Purpose of the Study:

• To evaluate a novel single embryo culture system for developing genetically modified zona-free (ZF) cattle embryos.
• To assess the efficacy of liposome-based SAMTOR target siRNA transfer in individually cultured ZF embryos.
• To validate the suitability of the single-culture system for subsequent analytical applications.

Main Methods:

• Development and implementation of a single embryo culture system for ZF cattle embryos.
• Application of liposome-based siRNA for SAMTOR gene silencing.
• Assessment of embryo cleavage and blastocyst rates.
• Quantification of SAMTOR transcript levels in 8-16 cell embryos.
• Measurement of total protein content in spent culture media.

Main Results:

• The single embryo culture system led to increased cleavage rates with minimal impact on blastocyst rates.
• Effective SAMTOR gene silencing was achieved in individually cultured ZF embryos.
• Transcript levels of SAMTOR were significantly reduced in treated embryos compared to controls.
• Total protein content analysis confirmed the system's suitability for embryo-media interaction studies.

Conclusions:

• The novel single embryo culture system supports efficient development of ZF cattle embryos.
• This system facilitates effective gene silencing, enhancing genetic editing capabilities.
• The approach provides a robust platform for advanced reproductive research and genetic applications in cattle.