Most porcine oocytes used in studies on embryo biotechnology and the in vitro production of embryos are currently obtained from the ovaries of slaughtered gilts. The duration and temperature during ovary transportatio...Most porcine oocytes used in studies on embryo biotechnology and the in vitro production of embryos are currently obtained from the ovaries of slaughtered gilts. The duration and temperature during ovary transportation and handling might, therefore, affect the recovery of culturable COCs, chromatin configuration and developmental competence of oocytes. The effects of ovary storage temperature on chromatin configuration and in vitro maturation of porcine oocytes were examined in this study. Ovaries collected from a slaughterhouse were stored in vitro for 8 h under different temperatures. The results showed that more culturable COCs were isolated from the ovares stored at 39℃ than that from ovaries stored at 31℃ or 20℃ and before storage. Thirty-one centidegree was the best storage temperature in terms of cumulus expansion, nuclear maturation and morphology of the first polar body after in vitro maturation culture. The ability of cumulus expansion was completely lost in COCs derived from ovaries stored at 39℃for 8 hours. Ovary storage (at both 31℃ and at 20℃) increased the proportion of oocytes with the GVc configuration in which chromatin condensed into a single big clump at the nucleolus and the functional significance of this configuration needs further investigations.展开更多
Different cell types in a certain organism contain the same genome while running diverse transcription programs. This is controlled by epigenetic information, including DNA modifications, histone modifications, histon...Different cell types in a certain organism contain the same genome while running diverse transcription programs. This is controlled by epigenetic information, including DNA modifications, histone modifications, histone variants, non-coding RNAs, and chromatin architectures. Interestingly, recent progresses revealed extensive crosstalks among these epigenetic players. We discuss here how epigenetic players coordinate with each other to maintain epigenetic identities in mammal cells. More exciting researches are expected to expand our understanding regarding the epigenetic regulatory network.展开更多
文摘Most porcine oocytes used in studies on embryo biotechnology and the in vitro production of embryos are currently obtained from the ovaries of slaughtered gilts. The duration and temperature during ovary transportation and handling might, therefore, affect the recovery of culturable COCs, chromatin configuration and developmental competence of oocytes. The effects of ovary storage temperature on chromatin configuration and in vitro maturation of porcine oocytes were examined in this study. Ovaries collected from a slaughterhouse were stored in vitro for 8 h under different temperatures. The results showed that more culturable COCs were isolated from the ovares stored at 39℃ than that from ovaries stored at 31℃ or 20℃ and before storage. Thirty-one centidegree was the best storage temperature in terms of cumulus expansion, nuclear maturation and morphology of the first polar body after in vitro maturation culture. The ability of cumulus expansion was completely lost in COCs derived from ovaries stored at 39℃for 8 hours. Ovary storage (at both 31℃ and at 20℃) increased the proportion of oocytes with the GVc configuration in which chromatin condensed into a single big clump at the nucleolus and the functional significance of this configuration needs further investigations.
基金supported by the Chinese Ministry of Science and Technology(2015CB856200 and 2011CB965300)the National Natural Science Foundation of China(91419305 and31425013)+1 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB08010103)the Howard Hughes Medical Institute International Early Career Scientist Program
文摘Different cell types in a certain organism contain the same genome while running diverse transcription programs. This is controlled by epigenetic information, including DNA modifications, histone modifications, histone variants, non-coding RNAs, and chromatin architectures. Interestingly, recent progresses revealed extensive crosstalks among these epigenetic players. We discuss here how epigenetic players coordinate with each other to maintain epigenetic identities in mammal cells. More exciting researches are expected to expand our understanding regarding the epigenetic regulatory network.
