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Coupling of histone mRNA levels to radioresistant DNA synthesis in ataxia-telangiectasia cells

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Abstract

Cloned genomic DNA for human histone H1, H3 and H4 genes has been used to determine the effects of γ-radiation on histone mRNA levels and synthesis in ataxia-telangiectasia cells. Synthesis of histone mRNA was determined in cells synchronized with aphidicolin. Effects of irradiation on DNA synthesis and passage through S phase were also monitored. Irradiation was found to slow the passage of control cells through the cell cycle but had no effect on progression of ataxia-telangiectasia cells. H1 and core histone mRNA synthesis was inhibited by radiation in two control cell lines after release from aphidicolin block. No inhibition was observed in one ataxia-telangiectasia cell line and a small degree of inhibition in a second. An increased level of mRNA was observed in both irradiated control and ataxia-telangiectasia cells at 5–7 h post-irradiation compared to unirradiated cells. Similar results were obtained in log phase cells. These results demonstrate that histone mRNA synthesis is radioresistant in ataxia-telangiectasia cells and is coupled to radioresistant DNA synthesis in these cells.

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Lavin, M.F., Houldsworth, J., Kumar, S. et al. Coupling of histone mRNA levels to radioresistant DNA synthesis in ataxia-telangiectasia cells. Mol Cell Biochem 73, 45–54 (1987). https://doi.org/10.1007/BF00229375

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  • DOI: https://doi.org/10.1007/BF00229375

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