Abstract
In lymphocyte cultures, the number of aneuploid cell nuclei increases with proband age mainly because of the loss of sex chromosomes. Since one possible cause of aneuploidy in cell nuclei is chromosomal lag at anaphase, with subsequent chromosome loss via micronucleus formation, we scored 5000 interphase nuclei from ten female and ten male probands for associated micronuclei. Whereas, in young (< 10 years) probands, an average of 0.15% interphase nuclei exhibited micronuclei, the frequency rose to 0.46% in older probands (> 70 years). In situ hybridizations with X-specific and Y-specific DNA probes were carried out, and the signal distribution in ten nuclei with associated micronuclei was documented for each donor. Our results indicate that the exclusion of sex chromosomes into micronuclei doubles during a human life, from 11% in young probands to 20% in old donors.
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Guttenbach, M., Schakowski, R. & Schmid, M. Aneuploidy and ageing: sex chromosome exclusion into micronuclei. Hum Genet 94, 295–298 (1994). https://doi.org/10.1007/BF00208287
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DOI: https://doi.org/10.1007/BF00208287