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Preserving the Female Genome in Trehalose Glass at Supra-Zero Temperatures: The Relationship Between Moisture Content and DNA Damage in Feline Germinal Vesicles

Overview
Journal Cell Mol Bioeng
Publisher Springer
Date 2021 Mar 1
PMID 33643469
Citations 4
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Abstract

Introduction: Maintaining a stable dry state is critical for long-term preservation of live biomaterials at suprazero temperatures. The objective of the study was to characterize the effect of moisture content on DNA integrity within the germinal vesicle (GV) of feline oocytes following dehydration and storage at 22-24 °C.

Methods: Using microwave-assisted drying, conditions that led to a predictable and stable moisture content in trehalose solutions were determined. To explore moisture content stability during storage, trehalose samples were dried for 15 min and stored in glass vials at 11 or 43% RH for 8 weeks. To examine whether this condition allowed proper storage of GVs, permeabilized cat oocytes were incubated in trehalose for 10 min and dried for 15 or 30 min. Oocytes then were rehydrated to assess DNA integrity either directly after drying or after 8 weeks of storage in an 11% RH environment. Raman spectroscopy was used to identify the states of dried samples during storage.

Results: Moisture content was stable during the storage period. There was no significant difference in DNA integrity between fresh and dried samples without storage. After 8 weeks of storage, DNA integrity was maintained in GVs dried for 30 min. Samples dried for 15 min and stored were compromised, suggesting crystallization of the preservation matrix during storage. Biostabilization was optimal when samples were directly processed to moisture contents consistent with storage in the glassy state.

Conclusion: Microwave-assisted drying processing and storage conditions were optimized to ensure stable long-term storage of structural and functional properties of genetic resources.

Citing Articles

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The Effect of Choline Salt Addition to Trehalose Solution for Long-Term Storage of Dried and Viable Nuclei from Fully Grown Oocytes.

Orozco Cabral J, Lee P, Wang S, Wang Y, Zhang Y, Comizzoli P Bioengineering (Basel). 2023; 10(9).

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Long-term storage of gametes and gonadal tissues at room temperatures: the end of the ice age?.

Comizzoli P, Loi P, Patrizio P, Hubel A J Assist Reprod Genet. 2022; 39(2):321-325.

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Drying and temperature induced conformational changes of nucleic acids and stallion sperm chromatin in trehalose preservation formulations.

Brogna R, Fan J, Sieme H, Wolkers W, Oldenhof H Sci Rep. 2021; 11(1):14076.

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