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• W2039250597 abstract "SUMMARYThe average telophasic nucleolar numbers were similar in five Chinese hamster cell cultures representing the diploid and aneuploid states, male and female cells, adult and embryo cells, tumor — derived and normal embryo — derived cells, primary and long — term cultures. The uneven telophasic nucleolar number, seven, indicates that, at least at this stage, one member of one pair of four regular nucleolar chromosome pairs is inactive.By interphase the telophasic number of nucleoli was reduced with the only really significant difference among the cultures being between those of male and female origin.Even under the special conditions of micronucleation brought about by prolonged colchicinization only some of the hamster chromosomes formed and maintained nucleoli regularly in the five cultures studied. All the hamster chromosomes, however, seem capable of forming a nucleolar body with a low frequency.Detailed analysis of the two diploid cell lines of female origin showed significantly more nucleolate micronuclei in the tumor-derived than in the embryo-derived culture. However, the average numbers of nucleoli in cells containing equal numbers of micronuclei in these two cultures did not differ significantly.The coefficient of correlation between the total number of micronuclei and the number of these lacking a nucleolus was significantly higher for the embryo than for the tumor-derived culture. Further analysis of the coefficients of correlation between numbers of micronuclei and numbers of nucleoli, and observations of patterns of micronuclear nucleolar activity, and nucleolar arrangements in intact interphase nuclei demonstrate that a fundamental difference between these two cultures is the intranuclear arrangement of nucleolar — forming relative to non-nucleolar chromosomes. In the embryo-derived cell culture the nucleolar chromosomes are grouped together in the center of the nucleus. In the tumor-derived cell culture the nucleolar chromosomes are relatively uniformly distributed among non-nucleolar chromosomes.These two different arrangements of nucleolus-organizing chromosomes could be due either to different, stable, nonrandom arrangements of chromosomes in these two cell cultures, or to the activity of different nucleolar loci in the two cell types, or to some combination of these two factors. This could be an example of a general variability of intranuclear position of nucleolus- organizing loci in different mammalian normal and tumor cell types." @default.
• W2039250597 created "2016-06-24" @default.
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• W2039250597 date "1968-01-01" @default.
• W2039250597 modified "2023-09-25" @default.
• W2039250597 title "Number and Arrangement of Nucleoli and Nucleolar Chromosomes in some Hamster Cell Cultures" @default.
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• W2039250597 doi "https://doi.org/10.1080/00087114.1968.10796309" @default.
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