Abstract
THERE is an urgent need to preserve the ever-increasing number (>30,000) of different genetic strains of D. melanogaster that are maintained in national and international stock centres and in the laboratories of individual investigators. In all cases, the stocks are maintained as adult populations and require transfer to fresh medium every two to four weeks. This is not only costly in terms of materials, labour and space, but unique strains are vulnerable to accidental loss, contamination, and changes in genotype that can occur during continuous culture through mutation, genetic drift or selection. Although Cryopreservation of Drosophila germ-plasm would be an enormous advantage, many attempts using conventional procedures have been unsuccessful. D. melanogaster embryos are refractory to conventional cryopreservation procedures because of the contravening conditions required to minimize mortality resulting from both intracellular ice formation and chilling injury at subzero temperatures. To overcome these obstacles, we have developed a vitrification procedure that precludes intracellular ice formation so that the embryos can be cooled and warmed at ultra-rapid rates to minimize chilling injury, and have recovered viable embryos following storage in liquid nitrogen. In a series of 53 experiments, a total of 3,711 larvae emerged from 17,280 eggs that were cooled in liquid nitrogen (18.4 ±8.8%). Further, using a subset from this population, approximately 3% of the surviving larvae (24/800) developed into adults. These adutts were fertile and produced an F1 generation.
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Steponkus, P., Myers, S., Lynch, D. et al. Cryopreservation of Drosophila melanogaster embryos. Nature 345, 170–172 (1990). https://doi.org/10.1038/345170a0
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DOI: https://doi.org/10.1038/345170a0
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