小鼠基因组DNA序列在小鼠L细胞中自主复制
1Institute of Biochemistry, University of Würzburg, Federal Republic of Germany.
Cell
|February 12, 1988
概括
研究人员在小鼠细胞中发现了新的自主复制序列 (ARS). 这些ARS元素对于DNA复制至关重要,并且可能包含保存的调节序列.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 哺乳动物细胞培养
背景情况:
- 自主复制对于维护真核细胞中的染色体外DNA元素至关重要.
- 识别赋予自主复制的序列是理解DNA复制起源和开发基因传递载体的关键.
研究的目的:
- 从小鼠Ltk-细胞中分离和表征DNA片段,使这些细胞能够自主复制.
- 研究这些新发现的自主复制序列 (ARS) 中的特性和潜在的保存元素.
主要方法:
- 构建含有随机基因组DNA片段和可选择标记物 (HAT抗性) 的重组等离子体.
- 鼠标L细胞的转化和对HAT抗性的选择.
- 使用DNA杂交,电子显微镜和细菌转化确认等离子体的存在和复制.
- 使用限制酶分析,氧氨替代,拷贝数确定和分离分析,对孤立的ARS进行表征.
主要成果:
- 成功分离了19个不同的DNA片段,在小鼠L细胞中实现了自主复制.
- 在转化细胞中证明了这些等离子体的存在和独立复制.
- 对9个ARS的序列分析显示,其中5个ARS中有一个保存的12bp元素 (CTCATGAGAGGCCAA).
结论:
- 鉴定出新的小鼠自主复制序列 (ARS),具有作为复制起源的潜力.
- 保存的12bp元素可能在启动或调节DNA复制中发挥作用.
- 这些发现有助于理解哺乳动物细胞中DNA复制机制.
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