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      Comparison of Actin Nucleation in Early Stage Mouse and Bovine Oocytes followed by Vitrification and Slow Freezing

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      https://www.riss.kr/link?id=A100086449

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      The cryopreservation of unfertilized oocytes is valuable for both livestock and human. However, freezing procedure to oocyte induce many kinds damages such as cytoskeleton disorganization, and chromosome and DNA abnormalities. Especially, during mam...

      The cryopreservation of unfertilized oocytes is valuable for both livestock and human.
      However, freezing procedure to oocyte induce many kinds damages such as cytoskeleton
      disorganization, and chromosome and DNA abnormalities. Especially, during mammalian
      oocyte meiotic maturation, a process called oocyte polarization occurs, which
      leads to a unique asymmetric division. Actin play key roles during oocyte polarization
      experiences several steps including spindle migration, spindle anchoring and cortical
      reorganization. However, how chilling stress affect to actin nucleation in oocytes is
      poorly studied. In this study, we investigated expressions and feature of Arp2/3 (actin
      activators), WAVE2 and JMY (nucleation promoting factors) in MІІ stage oocytes after
      different freezing procedure in oocytes. Results indicated that survival, IVF, developmental
      rates of vitrified-thawed oocytes were significantly higher than those of slow
      freezed oocytes. Especially, expressions of Arp2/3, WAVE2 and JMY in vitrified-thawed
      oocytes were similar with normal oocytes. However, expression of actin nucleation related
      genes in slow freezed group was significantly higher or lower than normal
      oocytes. Our results may suggested that slow freezing procedure to oocyte induced
      abnormal actin neucleation results in low survival and developmental rates.

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