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- W2044282903 abstract "Cryopreservation has been extensively used in human reproductive medicine, aquaculture and conservation programmes for endangered species. However, despite the growing successes of cryopreservation, post-thaw recovery of reproductive and embryonic cells very often remains poor. Many studies have been devoted to the mechanisms of cryodamage. It is known that cryopreservation causes extensive damage to membranes; reduce the metabolic activity of cells; and disturbs the mitochondrial bioenergetical processes of cells. But few investigations on the genetic stability of cells during cryopreservation have been performed, and the role of any genetic impact cryopreservation needs to be determined. Some indirect data in the literature suggests that progress in this field might come from investigating freezing damage to mitochondrial DNA (mtDNA), nuclear DNA and other genome-related structures. In this study, zebrafish (Danio rerio) blastomeres were treated in three different ways: control suspension of blastomere cells in phosphate buffered saline; equilibration of blastomeres with 2 M dimethyl sulfoxide (Me2SO) for 1 h at room temperature and cryopreservation using Me2SO as a cryoprotectant. Mitochondrial DNA was analysed in fresh cells and after the different treatments. Two different loci of mtDNA were amplified with the help of PCR and sequenced. The sequences were analysed and nuclear base substitutions were counted for both control and treated samples. The results showed that cryopreservation significantly increased the frequency of mutations (0.78 ± 0.27% in comparison to 0.16 ± 0.25% of control), whilst 2 M Me2SO treatment did not bring a significant increase in frequency of mutations (0.24 ± 0.28%). The distributions of the mutation locations were analysed. More investigations are needed to determine whether optimisation of cryopreservation protocol is possible to reduce these adverse effects; whether such mutations interfere with overall function of the cells; whether similar changes also occur in the nuclear DNA and whether such mutations happen in other species. Meanwhile, it is important to be cautious in making judgements of the effect of cryopreservation technique in assisted reproduction. This is the first report on the effect of cryopreservation on mtDNA." @default.
- W2044282903 created "2016-06-24" @default.
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- W2044282903 date "2005-02-01" @default.
- W2044282903 modified "2023-10-12" @default.
- W2044282903 title "Effect of cryopreservation on mitochondrial DNA of zebrafish (Danio rerio) blastomere cells" @default.
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- W2044282903 doi "https://doi.org/10.1016/j.mrfmmm.2004.09.007" @default.
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