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- W1974986564 abstract "For some chemicals, induction of presumed dominant lethal mutations has been observed only in female mice and not in males. In those cases, questions arise as to (1) whether the increased embryonic mortality is due to genetic effects of the chemicals in the oocyte or, (2) is caused indirectly through maternal toxicity, and, if genetic, (3) the basis for the sex difference. These questions were studied using the compounds adriamycin and platinol. Neither compound induces dominant lethals in male germ cells, but both increased early embryonic mortality when females were treated prior to mating (treatment of maturing oocytes). Reciprocal zygote transfer experiments rules out, either entirely or for the large part, maternal toxicit as the cause, and cytogenetic analysis of first-cleavage metaphases revealed high incidences of chromosomal aberrations. The results of both of these experiments thus provide evidence that the early embryonic mortality resulted from genetic effects induced in oocytes. Most interestingly, each compound produced unexpected types of chromosomal aberrations. Adriamycin produced deletions, rings, and presumed chromosome-type rearrangements. Platinol, on the other hand, produced a few chromatid-type aberrations, but the bulk of aberrations were characterized by disorganization of the chromatin, minute fragments, and thread-lik chromatin bridges between fragments and chromosomes or between two or more chromosomes. The latter type of cytogenetic damage was observed primarily in the compounds are associated with the diffused state of the maturing oocyte chromosomes." @default.
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- W1974986564 date "1990-06-01" @default.
- W1974986564 modified "2023-10-03" @default.
- W1974986564 title "Female-specific dominant lethal effects in mice" @default.
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- W1974986564 doi "https://doi.org/10.1016/0027-5107(90)90058-c" @default.
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