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• W2027152044 abstract "Genomic instability is a highly pleiotropic phenotype, which may reflect a variety of underlying mechanisms. Destabilization has been shown in some cases to involve mutational alteration or inactivation of trans-acting cellular factors, for example, p53 or mismatch repair functions. However, aspects of instability are not well explained by mutational inactivation of trans-acting factors, and other epigenetic and cis-acting mechanisms have recently been proposed. The trans and cis models result in divergent predictions for the distribution of instability-associated genetic alterations within the genome, and for the inheritance of genomic instability among sibling sub-clones of unstable parents. These predictions have been tested in this study primarily by tracking the karyotypic distribution of chromosomal rearrangements in clones and sub-clones exhibiting radiation-induced genomic instability; inheritance of mutator phenotypes was also analyzed. The results indicate that genomic instability is unevenly transmitted to sibling sub-clones, that chromosomal rearrangements within unstable clones are non-randomly distributed throughout the karyotype, and that the majority of chromosomal rearrangements associated with instability affect trisomic chromosomal segments. Observations of instability in trisomic regions suggests that in addition to promoting further alterations in chromosomal number, aneuploidy can affect the recovery of structural rearrangements. In summary, these findings cannot be fully explained by invoking a homogeneously distributed factor acting in trans, but do provide support for previous suggestions that genomic instability may in part be driven by a cis-acting mechanism." @default.
• W2027152044 created "2016-06-24" @default.
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• W2027152044 date "2004-12-01" @default.
• W2027152044 modified "2023-09-29" @default.
• W2027152044 title "Cis-acting transmission of genomic instability" @default.
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• W2027152044 doi "https://doi.org/10.1016/j.mrfmmm.2004.06.046" @default.
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