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Reduced ability to recover from spindle disruption and loss of kinetochore spindle assembly checkpoint proteins in oocytes from aged mice

Journal Article


Abstract


  • Currently, maternal aging in women, based on mouse models, is thought to raise oocyte aneuploidy rates, because chromosome cohesion deteriorates during prophase arrest, and Sgo2, a protector of centromeric cohesion, is lost. Here we show that the most common mouse strain, C57Bl6/J, is resistant to maternal aging, showing little increase in aneuploidy or Sgo2 loss. Instead it demonstrates significant kinetochore-associated loss in the spindle assembly checkpoint protein Mad2 and phosphorylated Aurora C, which is involved in microtubule-kinetochore error correction. Their loss affects the fidelity of bivalent segregation but only when spindle organization is impaired during oocyte maturation. These findings have an impact clinically regarding the handling of human oocytes ex vivo during assisted reproductive techniques and suggest there is a genetic basis to aneuploidy susceptibility. © 2014 Landes Bioscience.

Publication Date


  • 2014

Citation


  • Yun, Y., Holt, J. E., Lane, S. I. R., McLaughlin, E. A., Merriman, J. A., & Jones, K. T. (2014). Reduced ability to recover from spindle disruption and loss of kinetochore spindle assembly checkpoint proteins in oocytes from aged mice. Cell Cycle, 13(12), 1938-1947. doi:10.4161/cc.28897

Scopus Eid


  • 2-s2.0-84902496194

Start Page


  • 1938

End Page


  • 1947

Volume


  • 13

Issue


  • 12

Abstract


  • Currently, maternal aging in women, based on mouse models, is thought to raise oocyte aneuploidy rates, because chromosome cohesion deteriorates during prophase arrest, and Sgo2, a protector of centromeric cohesion, is lost. Here we show that the most common mouse strain, C57Bl6/J, is resistant to maternal aging, showing little increase in aneuploidy or Sgo2 loss. Instead it demonstrates significant kinetochore-associated loss in the spindle assembly checkpoint protein Mad2 and phosphorylated Aurora C, which is involved in microtubule-kinetochore error correction. Their loss affects the fidelity of bivalent segregation but only when spindle organization is impaired during oocyte maturation. These findings have an impact clinically regarding the handling of human oocytes ex vivo during assisted reproductive techniques and suggest there is a genetic basis to aneuploidy susceptibility. © 2014 Landes Bioscience.

Publication Date


  • 2014

Citation


  • Yun, Y., Holt, J. E., Lane, S. I. R., McLaughlin, E. A., Merriman, J. A., & Jones, K. T. (2014). Reduced ability to recover from spindle disruption and loss of kinetochore spindle assembly checkpoint proteins in oocytes from aged mice. Cell Cycle, 13(12), 1938-1947. doi:10.4161/cc.28897

Scopus Eid


  • 2-s2.0-84902496194

Start Page


  • 1938

End Page


  • 1947

Volume


  • 13

Issue


  • 12