Diazepam induces meiotic delay, aneuploidy and predivision of homologues and chromatids in mammalian oocytes

Yin H, Baart E, Betzendahl I, Eichenlaub-Ritter U (1998)
MUTAGENESIS 13(6): 567-580.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
The tranquilizer and anti-convulsant diazepam (DZ) is a suspected aneugen. In order to assess its aneugenic potential in mammalian oogenesis we exposed in vitro maturing mouse oocytes to the drug. Spindle formation and cell cycle progression, the behaviour of chromosomes and the distribution of mitochondria were characterized with respect to induction of numerical chromosomal aberrations. A concentration of 25 mu g/ml DZ induced a pronounced delay in maturation and blocked a high percentage of oocytes in meiosis I. This arrest was partly reversible. Hyperploidy was slightly increased in oocytes matured in the presence of 5 mu g/ml DZ and became significantly elevated in oocytes matured with 25 mu g/ml DZ, relative to controls. Concomitantly, DZ induced spindle aberrations and displacement of chromosomes from the equator, but unlike in mitosis and in male meiosis most oocytes still possessed bipolar spindles. A significant fraction of meiotically delayed, metaphase I-blocked oocytes exposed to 25 mu g/ml DZ contained univalents. Some DZ-treated oocytes progressing to meiosis II exhibited one or multiple single chromatids, Precocious chiasma resolution and equational segregation of chromatids from functional univalents in first anaphase (predivision) may be responsible for this condition, a mechanism also discussed in the aetiology of maternal age-related aneuploidy, DZ disturbed the spatiotemporal distribution of mitochondria during oocyte maturation, possibly by binding to peripheral-type benzodiazepine receptors on mitochondria, thus affecting the availability of ATP and calcium homeostasis. Blocks in maturation may also relate to binding of DZ to calmodulin. Data suggest that DZ exposes mammalian oocytes to predivision and aneuploidy, Thresholds, long lasting effects of DZ in vivo and sex-specific sensitivities in chemically induced aneuploidy of mammalian germ cells are critically evaluated.
Erscheinungsjahr
Zeitschriftentitel
MUTAGENESIS
Band
13
Zeitschriftennummer
6
Seite
567-580
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Yin H, Baart E, Betzendahl I, Eichenlaub-Ritter U. Diazepam induces meiotic delay, aneuploidy and predivision of homologues and chromatids in mammalian oocytes. MUTAGENESIS. 1998;13(6):567-580.
Yin, H., Baart, E., Betzendahl, I., & Eichenlaub-Ritter, U. (1998). Diazepam induces meiotic delay, aneuploidy and predivision of homologues and chromatids in mammalian oocytes. MUTAGENESIS, 13(6), 567-580. doi:10.1093/mutage/13.6.567
Yin, H., Baart, E., Betzendahl, I., and Eichenlaub-Ritter, U. (1998). Diazepam induces meiotic delay, aneuploidy and predivision of homologues and chromatids in mammalian oocytes. MUTAGENESIS 13, 567-580.
Yin, H., et al., 1998. Diazepam induces meiotic delay, aneuploidy and predivision of homologues and chromatids in mammalian oocytes. MUTAGENESIS, 13(6), p 567-580.
H. Yin, et al., “Diazepam induces meiotic delay, aneuploidy and predivision of homologues and chromatids in mammalian oocytes”, MUTAGENESIS, vol. 13, 1998, pp. 567-580.
Yin, H., Baart, E., Betzendahl, I., Eichenlaub-Ritter, U.: Diazepam induces meiotic delay, aneuploidy and predivision of homologues and chromatids in mammalian oocytes. MUTAGENESIS. 13, 567-580 (1998).
Yin, H, Baart, E, Betzendahl, I, and Eichenlaub-Ritter, Ursula. “Diazepam induces meiotic delay, aneuploidy and predivision of homologues and chromatids in mammalian oocytes”. MUTAGENESIS 13.6 (1998): 567-580.

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