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A study of meiotic pairing, nondisjunction and germ cell death in laboratory mice carrying Robertsonian translocations

Published online by Cambridge University Press:  14 April 2009

C. A. Everett
Affiliation:
Department of Zoology, University of Oxford, South Parks Road, Oxford 0X1 3PS Department of Obstetrics and Gynaecology, Centre for Reproductive Biology, University of Edinburgh, 37 Chalmers Street, Edinburgh EH3 9EW. Tel. 0131 229 2575. Fax. 0131 229 2408. E-mail [email protected]
J. B. Searle
Affiliation:
Department of Zoology, University of Oxford, South Parks Road, Oxford 0X1 3PS Department of Biology, University of York, PO Box 373, York YO1 5YW, UK. Tel. 01904 4329 7. Fax. 01904 432860. E-mail [email protected]
B. M. N. Wallace
Affiliation:
School of Biological Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT. Tel. 0121 414 5917. Fax. 0121 414 5925 E-mail [email protected]
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Frequencies of anaphase I nondisjunction, germ cell death and pairing abnormalities at pachytene were assessed in male mice singly heterozygous and homozygous for the Robertsonian (Rb) translocations: Rb (1.3)lBnr, Rb(ll. 13)4Bnr and Rb(10. ll)8Bnr. Rb homozygotes showed low frequencies of nondisjunction but substantial germ cell death. This germ cell death could not be attributed to problems at pachytene as Rb homozygotes showed no increase in pairing abnormalities over the (C3H/HeH×1O1/H)F1 controls. Instead genie factors are involved. Rb heterozygotes showed substantial frequencies of nondisjunction and even greater germ cell death than found in the homozygotes. Pachytene pairing abnormalities were observed and it appears that these, together with genie factors, cause physiological perturbation of meiocytes, thereby promoting germ cell death, with nondisjunction of the trivalent as a sublethal response.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1996

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