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Pattern and frequency of nocodazole induced meiotic nondisjunction in oocytes of mice carrying the ‘tobacco mouse’ metacentric Rb(16.17)7Bnr

Published online by Cambridge University Press:  14 April 2009

C. A. Everett  and
J. B. Searle
C. A. Everett*
Affiliation:
Department of Zoology, South Parks Road, Oxford OX1 3PS
J. B. Searle
Affiliation:
Department of Zoology, South Parks Road, Oxford OX1 3PS
*
* Corresponding author.

Summary

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Oocytes from (C3H/HeH × 101/H)F1 and Rb(16.17)7Bnr homozygous females were exposed to a range of doses of nocodazole in vitro. The spindle poison caused a dose dependent increase in metaphase I (MI) arrest and hyperploidy. A concentration of 0·03 μg/ml was found to induce a maximum hyperploid frequency of 3·1% and 11·6% respectively without a high level of MI arrest. Between 0·03 and 0·05 μg/ml MI arrest increased substantially and reached a frequency of approximately 90%. In a further experiment oocytes from Rb7 homozygous, heterozygous and 3H1 females were exposed to 0·03 μg/ml nocodazole 4, 6 or 8 h after the onset of maturation. The phase at which the spindle was inhibited resulted in a specific pattern of nondisjunction which in turn was dependent on whether the female carried an Rb metacentric. 3H1 oocytes gave a normally distributed pattern of increase in aneuploid frequency (over the spontaneous value) centering around a 6 h application. This was thought to be due to the interaction of chromosomes with the microtubules of the spindle during attachment and/or alignment. In contrast both Rb homozygotes and heterozygotes gave the same biphasic response, with a high frequency of aneuploidy in the oocytes when nocodazole was applied 4 and 8 h after the onset of maturation. In Rb homozygotes we demonstrated that the Rb bivalent underwent nondisjunction more frequently than the average acrocentric, when nocodazole was administered early. It can be assumed that the Rb trivalent in Rb heterozygotes showed a similar response. This early Rb specific effect, in combination with a delayed-version of the acrocentric effect found in the 3H1 mice was thought to generate the biphasic pattern. We discuss the implications of (a) the different meiotic behaviours of metacentrics and acrocentrics and (b) the meiotic delay in Rb mice.

Type
Research Article
Information
Genetics Research , Volume 66 , Issue 1 , August 1995 , pp. 35 - 43
Copyright
Copyright © Cambridge University Press 1995

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