Electronic Resource
New York, NY [u.a.]
:
Wiley-Blackwell
Molecular Reproduction and Development
25 (1990), S. 374-383
ISSN:
1040-452X
Keywords:
Ovarian follicle
;
Oocyte
;
Germinal vesicle
;
Chromosomes
;
Microtubules
;
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Biology
Notes:
Changes in the organization of germinal vesicle chromatin in mouse oocytes have been analyzed by fluorescence microscopy with respect to progressive stages of follicular development and the disposition of oocyte cytoplasmic microtubules. Four discrete patterns of chromatin organization exist in germinal vesicle (GV)-stage oocytes isolated from the ovaries of 21-25-day-old gonadotropin-primed mice. Analysis of ovarian cryosections stained with the DNA-binding fluorochrome Hoechst 33258 indicates that sequential changes in GV chromatin occur duing folliculogenesis that result in the formation of a continuous perinucleolar chromatin sheath at the time of antrum formation. Specific alterations in the cytoplasmic microtubule complex of GV-stage oocytes were observed that correlate with chromatin patterns. The extensive cytoplasmic microtubule complex seen in oocytes of preantral follicles initially localizes to perinuclear areas of the ooplasm. This is followed by a progressive reduction in cytoplasmic microtubules and the appearance of prominent microtubule-organizing centers at the nuclear periphery. Coordinated nuclear and microtubular alterations also occur under in vitro conditions prior to progression of meiosis to prometaphase-1. The results are discussed with respect to the ongoing differentiation of the oocyte nucleus and the microtubule cytoskeleton during folliculogenesis in preparation for the resumption of meiosis.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrd.1080250411
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