Human Reproduction, Vol. 17, No. 4, 1006-1016,
April 2002
© 2002 European Society of Human Reproduction and Embryology
Assessment of nuclear and cytoplasmic maturation in in-vitro matured human oocytes
1 Department of Anatomy and Cellular Biology, Tufts University School of Medicine, Boston and 2 Department of Obstetrics and Gynecology and Reproductive Biology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
BACKGROUND: With improved prospects for the use of human oocyte in-vitro maturation in assisted reproductive technologies, the need to define more clearly the coordination of nuclear and cytoplasmic maturation has arisen. METHODS: Immunofluorescence and confocal microscopy were used to evaluate cell cycle-dependent modifications in chromatin and microtubules in human germinal vesicle oocytes (n = 455) undergoing in-vitro maturation. RESULTS: Four distinct classes of germinal vesicle stage oocytes were identified based on the expression of G2/interphase characteristics, but, of these, only one class of oocytes was competent to complete meiotic progression to metaphase-II in vitro. The majority of germinal vesicle stage oocytes resumed meiosis within 6 h (88.9%) of culture and exhibited an accelerated pace of progression to metaphase-II (66.7%) over 24 h, but in general were unable to maintain meiotic arrest and defaulted into interphase within 24 h of polar body emission. Characterization of microtubule dynamics and chromatin phosphorylation demonstrates specific cell cycle deficiencies in in-vitro matured human oocytes. CONCLUSION: This work forms a basis for future studies aimed at optimizing nuclear and cytoplasmic maturation during in-vitro maturation.
Key words: chromatin/human/maturation/microtubule/oocyte
3 Present address: Institute for Reproductive Medicine and Science, St Barnabas Medical Center, Livingston, NJ, USA
4 To whom correspondence should be addressed at: Department of Anatomy and Cellular Biology, Tufts University School of Medicine, 136 Harrison Avenue, Boston, MA 02111, USA. E-mail: david.albertini{at}tufts.edu
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