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在无细胞提取物中补充色素菌DNA修复缺陷的补充
R D Wood1, P Robins, T Lindahl
1Imperial Cancer Research Fund, Clare Hall Laboratories, Hertfordshire, England.
人类细胞提取物可以通过一种称为切除修复的过程来修复受损的DNA. 这种DNA修复在Xeroderma pigmentosum细胞中是有缺陷的,但可以通过混合不同基因组的提取物来恢复.
科学领域:
- 分子生物学分子生物学
- DNA 修复机制的修复机制
- 人类遗传学 人类遗传学
背景情况:
- 像pyrimidine二元和psoralen adducts这样的DNA损伤对基因组完整性构成威胁.
- 切割修复是消除DNA病变和保持遗传稳定性的关键细胞过程.
- Xeroderma pigmentosum (XP) 是一种遗传性疾病,其特点是由于DNA修复缺陷而对阳光极度敏感.
研究的目的:
- 描述可溶性人类淋巴细胞提取物,能够进行DNA修复合成.
- 为了研究ATP在受损DNA的切割修复中的作用.
- 为了确定Xeroderma pigmentosum各种遗传补充群体的DNA修复途径中的缺陷.
主要方法:
- 从人类淋巴细胞系中制备可溶性提取物.
- 在含有胺二聚体或素添加物的共封闭圆形DNA上对DNA修复合成的测试.
- 使用Micrococcus luteus pyrimidine二元DNA糖酶在紫外线辐射的DNA中创建切口以进行修复评估.
- 补充分析是通过混合不同色素菌的基因组的细胞提取物进行的.
主要成果:
- 可溶性提取物证明了依赖ATP的切除修复合成,将短片核酸引入受损DNA中.
- 色素菌细胞系的提取物未能修复受损的圆形DNA,但可以修复切割的DNA.
- 在所有被调查的色素菌补充组 (A,B,C,D,H和V) 中,DNA修复活性有缺陷.
- 从补充组A和C中混合细胞提取物恢复了DNA修复活性.
结论:
- 人类淋巴细胞提取物具有对受损DNA的ATP依赖切除修复的酶机制.
- Xeroderma pigmentosum与多个DNA修复途径的缺陷有关,影响不同的遗传补充组.
- 补充分析为剖析DNA修复途径和识别特定遗传缺陷提供了强大的工具.
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