reproductive system
N |
• despite meiotic abnormalities mice are fertile and produce normal sized litters
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• slight but significant increase in the percentage of zygotene cells during the semi-synchronous first wave of meiosis at P12
• increase in the number of apoptotic cells in stage XII tubules but no change in overall proportion of apoptotic cells when all tubules are examined
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• staining indicates an increase in the number of double strand break repair foci in pachytene cells in adult males
• decrease in mean autosomal crossovers, about half as many double exchange bivalents, and an increase in the proportion of double-exchange synaptonemal complexes with short inter-crossover distances
• the proportion of spindles with laggard chromosomes is increased to 12.9% compared to 5.6% in controls and the proportion of achiasmate XY and autosomal chromosomes are increased
• double strand break formation and early steps of repair appear similar to controls
• no increase in the percentage of aneuploid cells is detected
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cellular
• staining indicates an increase in the number of double strand break repair foci in pachytene cells in adult males
• decrease in mean autosomal crossovers, about half as many double exchange bivalents, and an increase in the proportion of double-exchange synaptonemal complexes with short inter-crossover distances
• the proportion of spindles with laggard chromosomes is increased to 12.9% compared to 5.6% in controls and the proportion of achiasmate XY and autosomal chromosomes are increased
• double strand break formation and early steps of repair appear similar to controls
• no increase in the percentage of aneuploid cells is detected
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