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- W1964699982 endingPage "13196" @default.
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- W1964699982 abstract "Depletion of poly(ADP-ribose) polymerase (PARP) increases the frequency of recombination, gene amplification, sister chromatid exchanges, and micronuclei formation in cells exposed to genotoxic agents, implicating PARP in the maintenance of genomic stability. Flow cytometric analysis now has revealed an unstable tetraploid population in immortalized fibroblasts derived from PARP −/− mice. Comparative genomic hybridization detected partial chromosomal gains in 4C5-ter, 5F-ter, and 14A1-C1 in PARP −/− mice and immortalized PARP −/− fibroblasts. Neither the chromosomal gains nor the tetraploid population were apparent in PARP −/− cells stably transfected with PARP cDNA [PARP −/− (+PARP)], indicating negative selection of cells with these genetic aberrations after reintroduction of PARP cDNA. Although the tumor suppressor p53 was not detectable in PARP −/− cells, p53 expression was partially restored in PARP −/− (+PARP) cells. Loss of 14D3-ter that encompasses the tumor suppressor gene Rb-1 in PARP −/− mice was associated with a reduction in retinoblastoma(Rb) expression; increased expression of the oncogene Jun was correlated with a gain in 4C5-ter that harbors this oncogene. These results further implicate PARP in the maintenance of genomic stability and suggest that altered expression of p53, Rb, and Jun, as well as undoubtedly many other proteins may be a result of genomic instability associated with PARP deficiency." @default.
- W1964699982 created "2016-06-24" @default.
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- W1964699982 date "1999-11-09" @default.
- W1964699982 modified "2023-10-14" @default.
- W1964699982 title "Chromosomal aberrations in PARP <sup>−/−</sup> mice: Genome stabilization in immortalized cells by reintroduction of poly(ADP-ribose) polymerase cDNA" @default.
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- W1964699982 doi "https://doi.org/10.1073/pnas.96.23.13191" @default.
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