Intraspecific blastocyst reconstitution in mice using giant trophectodermal vesicles produced by multiple embryo...

Area of Science:

• Developmental Biology
• Reproductive Science
• Genetics

Background:

• Embryo aggregation for creating chimeric conceptuses can impair development.
• Factors influencing aggregate viability include developmental rates, in vitro culture duration, and genetic compatibility.

Purpose of the Study:

• To evaluate giant trophectodermal (TE) vesicles for enhancing murine blastocyst viability.
• To investigate the impact of developmental rates, in vitro culture length, and genetic factors on embryo aggregate development.
• To assess the efficacy of TE vesicles in intraspecific blastocyst reconstitution.

Main Methods:

• Aggregation of multiple mouse embryos to form giant TE vesicles.
• In vitro culture of aggregates and singletons for varying durations.
• Blastocyst reconstitution using TE vesicles from one mouse strain and inner cell masses from another.
• Comparison of offspring numbers from reconstituted blastocysts, embryo aggregates, and controls.

Main Results:

• Aggregate viability was influenced by embryo genotype and in vitro culture length.
• Offspring numbers from aggregates cultured for 0.7 days were not significantly different from singletons or controls.
• Reconstitution using giant TE vesicles yielded offspring numbers comparable to embryo aggregates and controls.

Conclusions:

• Giant TE vesicles are a viable method for enhancing reconstituted murine blastocyst viability.
• TE vesicles can be effectively utilized for intraspecific blastocyst reconstitution in mice.
• This approach offers a promising strategy for improving developmental outcomes in assisted reproduction.