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Induction of Thioguanine- and Ouabain-Resistant Mutants and Single-Strand Breaks in the DNA of Chinese Hamster Ovary Cells by 3H-Thymidine

机译:3H-胸腺嘧啶核苷诱导中国仓鼠卵巢细胞中的硫鸟嘌呤和哇巴因抗性突变体及单链断裂

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摘要

Cultured Chinese hamster cells were labeled with 6-3H-thymidine or 5-methyl-3H-thymidine and allowed to accumulate damage from 3H decays for various periods of time while frozen. The frequencies of cells resistant to 6-thioguanine or ouabain and the amount of DNA damage (i.e., number of single-strand breaks) were determined and compared with the mutation frequencies resulting from X and ultraviolet light irradiation. Whereas 3H decays and X rays made only 6-thioguanine-resistant mutants, ultraviolet light made both 6-thioguanine- and ouabain-resistant mutants. 3H decays originating at the 6 position were two to three times as effective as decays at the 5-methyl position in making drug-resistant mutants, but decays at both sites were equally effective in making single-strand breaks. Mutants and strand breaks produced by beta irradiation of the nucleus probably are the same irrespective of the site of the decay in thymine; these results indicate that the local transmutation effects of 3H decay produce more mutations when they occur at the 6 position than at the 5-methyl position.
机译:培养的中国仓鼠细胞用6- 3 H-胸腺嘧啶核苷或5-甲基- 3 H-胸腺嘧啶核苷标记,并允许积累来自 3 的损伤H在冻结期间会衰减各种时间。测定对6-硫代鸟嘌呤或哇巴因具有抗性的细胞的频率和DNA损伤的量(即单链断裂的数目),并将其与X和紫外线照射导致的突变频率进行比较。而 3 H衰变,X射线仅产生抗6-硫代鸟嘌呤的突变体,而紫外线则产生抗6-硫代鸟嘌呤和哇巴因的突变体。在产生抗药性突变体中,起源于6位的 3 H衰变的效率是5位甲基位置的衰变的2至3倍,但两个位点的衰变对制备单链都同样有效休息。不论胸腺嘧啶衰变的位置如何,由核的β射线辐照产生的突变体和链断裂都可能是相同的。这些结果表明, 3 H衰变的局部突变效应在6位发生时比5位在甲基处产生更多的突变。

著录项

  • 期刊名称 Genetics
  • 作者

    James E. Cleaver;

  • 作者单位
  • 年(卷),期 1977(87),1
  • 年度 1977
  • 页码 129–138
  • 总页数 10
  • 原文格式 PDF
  • 正文语种
  • 中图分类 遗传学;
  • 关键词

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