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- W2107543454 abstract "Unirradiated, exponentially growing Chinese hamster cells contain a low level (less than 5%) of their DNA firmly bound to protein, as measured by a filter-binding assay. That fraction of DNA is highly enriched in sequences which hybridize to poly(A+)RNA or ribosomal RNA. After 60 Gy gamma irradiation, the additional crosslinked DNA is also enriched in transcriptionally active sequences compared to bulk DNA, while DNA crosslinked by uv radiation has a frequency of active sequences which is no higher than the bulk DNA. DNA crosslinked to protein by gamma radiation but not by uv is largely released during a 4-h postirradiation incubation. The DNA which remains bound to protein during that period becomes depleted in active sequences; this is followed by an apparent restoration of the active gene-enriched protein complex found in unirradiated cells. When nuclear matrix-associated DNA was isolated free of the majority (loop) DNA, an enrichment for active DNA sequences was found in the matrix-associated DNA, and the frequency of DNA-protein crosslinks was found to be 10- to 16-fold greater in the matrix fraction. Gel electrophoretic analysis of the crosslinking proteins identifies them as subset of proteins of the nuclear matrix. These data are consistent with known properties of the nuclear matrix and suggest that chromatin structure plays an important role in the formation and repair of gamma-radiation-induced DNA lesions." @default.
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- W2107543454 date "1986-07-01" @default.
- W2107543454 modified "2023-10-16" @default.
- W2107543454 title "Nuclear Matrix Proteins Are Crosslinked to Transcriptionally Active Gene Sequences by Ionizing Radiation" @default.
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- W2107543454 doi "https://doi.org/10.2307/3576847" @default.
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