Embryo competence and cryosurvival: Molecular and cellular features

Area of Science:

• Reproductive Biotechnology
• Embryology
• Animal Genetics

Background:

• The global cattle genetic market is shifting, with increased demand for in vitro produced (IVP) embryos.
• Current IVP embryo production efficiency is low, and cryopreservation survival rates are inconsistent, hindering widespread adoption.
• Enhancing embryo quality and cryosurvival is crucial for the dissemination of IVP technologies in cattle breeding.

Purpose of the Study:

• To discuss the molecular and cellular features linked to the competence and cryosurvival of IVP cattle embryos.
• To establish relationships between embryo developmental ability, quality, cryosurvival, and pregnancy success.
• To identify determinant factors influencing embryo competence and cryosurvival.

Main Methods:

• Review of morphofunctional, cellular, and molecular competence of IVP embryos.
• Analysis of factors affecting embryo competence and cryosurvival, including genotype, oocyte quality, and in vitro conditions.
• Discussion of embryo cryopreservation techniques and an embryo-focused approach to improve survival rates.

Main Results:

• Established a correlation between embryo developmental ability, quality, and post-cryopreservation survival and pregnancy success.
• Identified key factors influencing IVP embryo competence and cryosurvival, such as oocyte quality, follicular microenvironment, and lipid content.
• Highlighted the need for an embryo-focused strategy to optimize cryopreservation outcomes.

Conclusions:

• Understanding the molecular and cellular basis of embryo competence is essential for improving IVP efficiency.
• Optimizing in vitro production conditions and considering factors like genotype and oocyte quality can enhance embryo cryosurvival.
• A targeted approach to embryo cryopreservation is necessary to maximize the success of IVP technologies in the cattle industry.