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Related Experiment Videos

A simplified method for freezing mouse blastocysts

V Landa

    Folia Biologica
    |January 1, 1982
    PubMed
    Summary

    Long-term storage of mouse blastocysts via slow freezing to -196°C preserves viability comparable to unfrozen embryos. Successful development requires immediate thawing and transfer into pseudopregnant females on day 2 of pseudopregnancy.

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    Area of Science:

    • Reproductive Biology
    • Cryobiology
    • Developmental Biology

    Background:

    • Cryopreservation of mammalian embryos is crucial for assisted reproductive technologies.
    • Optimizing protocols for blastocyst cryopreservation is essential for improving success rates.

    Purpose of the Study:

    • To evaluate the long-term survival and developmental potential of mouse blastocysts after slow-freezing and ultra-low temperature storage.
    • To determine the optimal timing for transferring cryopreserved blastocysts into recipient females.

    Main Methods:

    • Mouse blastocysts were slowly frozen to -25°C, then transferred to -196°C for long-term storage.
    • Thawing protocols involved rapid warming at 450-650°C/min.
    • Cryopreserved and fresh blastocysts were transferred to pseudopregnant females on different days of pseudopregnancy (day 2, 3, or 4).

    Main Results:

    • Blastocysts stored at -196°C showed survival rates comparable to unfrozen controls.
    • In vitro development post-thawing was high (91-93%) with rapid warming.
    • Optimal in vivo development (60.3% fetuses) was achieved when thawed blastocysts were transferred on day 2 of pseudopregnancy.

    Conclusions:

    • Slow freezing to -196°C is an effective method for long-term mouse blastocyst storage.
    • Successful pregnancy outcomes depend critically on the precise timing of embryo transfer post-thaw.
    • Day 2 transfer of cryopreserved blastocysts yields high success rates, comparable to fresh embryo transfers under optimal conditions.

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