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The possibility of embryo cryopreservation is important for applying the genome resource banking (GRB) concept to those mammalian species that exhibit embryonal diapause in their early development. Odc1 encodes ODC1, which is a key enzyme in polyamine synthesis. RhoA is an essential part of Rho/ROCK system. Both Odc1 and RhoA play an important role in preimplantation embryo development. Studying these systems in mammalian species with obligate or experimentally designed embryonic diapause may provide insight into the molecular machinery underlying embryo dormancy and re‐activation. The effect of cryopreservation procedures on the expression of the Odc1 and RhoA in diapausing embryos has not been properly studied yet. The purpose of this work is to address the possibility of cryopreservation diapausing embryos and to estimate the expression of the Odc1 and RhoA genes in diapausing and non‐diapausing embryos before and after freeze–thaw procedures using ovariectomized progesterone treated mice as a model. Both diapausing and non‐diapausing in vivo‐derived embryos continued their development in vitro after freezing–thawing as evidenced by blastocoel re‐expansion. Although cryopreservation dramatically decreased the expression of the Odc1 and RhoA genes in non‐diapausing embryos, no such effects have been observed in diapausing embryos where these genes were already at the low level before freeze–thaw procedures. Future studies may attempt to facilitate the re‐activation of diapausing embryos, for example frozen–thawed ones, specifically targeting Odc1 or Rho/ROCK system. [ABSTRACT FROM AUTHOR]

Objective: The study investigates how IVC and ET affect hypertensive phenotype in ISIAH rats. Methods: ISIAH rats born as the result of ET and IVC were compared with naturally conceived controls. Results: Embryo transfer from hypertensive ISIAH rats to normotensive recipient dams caused lower SBP and DBP in the female offspring. When ET was accompanied with in vitro culture in R1ECM, not only the female offspring, but also males demonstrated alleviation of hypertension. Conclusions: IVC at the preimplantation embryo stage affected the manifestation of hypertension in the adult ISIAH offspring. [ABSTRACT FROM AUTHOR]