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- W2005231749 abstract "Replication of DNA containing unrepaired lesions such as depurinated sites, single-strand breaks or methylated bases such as O -6 and N -7 methylguanine was studied in the rat liver. Rat liver DNA was damaged by administering 10 μg dimethyl-nitrosamine (DMN)/g body wt. i.p. 4 h prior to partial hepatectomy. The analysis of DNA on alkaline sucrose gradient revealed considerable damage to the parental strand at the time of and 48 h subsequent to partial hepatectomy. During this time interval, the synthesis of new strands was studied using labeled thymidine. In the control liver, radioactivity in DNA appeared as small fragments at 15 and 30 min following the administration of labeled thymidine which became bigger within 4 h. In the carcinogen-treated livers, the newly made DNA remained as small fragments for longer periods of time. Sometime between 4 and 24 h these became bigger in size than the parental damaged template DNA. Thus, with a delay, the newly made strands became eventually bigger, in spite of the fact that the parental template DNA strand was damaged. Such replication of DNA with unrepaired lesions (miscoding and/or non-coding) offers a mechanism by which the original damage to DNA caused by the carcinogen can be permanently imprinted on the newly made cell, a phenomenon that could account for the initiation of carcinogenesis under certain circumstances." @default.
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- W2005231749 title "Replication of hepatic DNA in rats treated with dimethylnitrosamine" @default.
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- W2005231749 doi "https://doi.org/10.1016/0009-2797(75)90078-2" @default.
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