Protocol to preserve mouse freeze-dried spermatozoa in the thin plastic sheets
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Updated: Oct 12, 2025
Mouse Sperm Cryopreservation and Recovery using the I·Cryo Kit
Published on: December 12, 2011
Daiyu Ito1, Teruhiko Wakayama1,2
1Faculty of Life and Environmental Science, University of Yamanashi, Kofu 400-8510, Japan.
Abstract:
The preservation of mammalian freeze-dried (FD) spermatozoa is commonly performed using small glass ampules; however, they are bulky and breakable. In this study, we present a protocol to prepare and preserve mouse FD sperm using thin plastic sheets. This approach allows storing thousands of mouse strains in a card folder. We can also send the FD sperm domestically using a postcard without any extra equipment. For complete details on the use and execution of this protocol, please refer to Ito et al. (2021).
Insights
Researchers developed a novel method for preserving freeze-dried (FD) mouse sperm using thin plastic sheets, offering a compact and easily transportable alternative to traditional glass ampules for efficient sperm banking.
Area of Science:
- Reproductive Biology
- Cryobiology
- Animal Genetics
Background:
- Traditional preservation of freeze-dried (FD) mammalian spermatozoa relies on glass ampules, which are bulky and prone to breakage.
- Existing methods pose challenges for large-scale storage and domestic transportation of valuable genetic resources.
Purpose of the Study:
- To introduce a new protocol for preparing and preserving mouse FD sperm using thin plastic sheets.
- To offer a more practical and efficient alternative for sperm banking and distribution.
Main Methods:
- Development of a novel protocol utilizing thin plastic sheets for mouse FD sperm preparation and preservation.
- Demonstration of storage capacity for thousands of mouse strains in a card folder format.
- Validation of domestic shipping feasibility via postcard without specialized equipment.
Main Results:
- Successful preparation and preservation of mouse FD sperm using thin plastic sheets.
- Demonstrated potential for high-density storage of numerous mouse strains.
- Confirmed ease of domestic transportation, enabling wider accessibility of genetic material.
Conclusions:
- The thin plastic sheet method provides a significant advancement in the preservation and distribution of FD mouse sperm.
- This innovative approach enhances the efficiency and practicality of sperm banking for research and conservation purposes.
- The protocol facilitates easier domestic shipping, promoting broader access to mouse genetic resources.
