Single-strand breaks can lead to complex configurations of plasmid DNA in vitro.

Single-strand breaks can lead to complex configurations of plasmid DNA in vitro.
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单链断裂可导致质粒 DNA 在体外形成复杂的构型。

DOI:
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发表时间:
1987
期刊:
International Journal of Radiation Biology and Related Studies in Physics Chemistry and Medicine
影响因子:
--
通讯作者:
C. Herskind
C. Herskind
中科院分区:
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文献类型:
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作者:
C. Herskind

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在琼脂糖凝胶电泳法中迁移极慢的DNA物种可能是由含有辐射诱导的单链断裂(SSB)的质粒DNA形成的。辐照后在低离子强度缓冲液中的热处理和随后与镁离子的孵育强烈地促进了这些物种的形成。这种处理后拍摄的电子显微镜显示,许多复杂的构型包含来自几个质粒分子的DNA材料。当DNA与磷酸钙在生理平衡的缓冲液中共沉淀并在用于DNA介导的基因转移的条件下孵育时,在没有辐射后热处理或镁离子孵育的情况下,缓慢迁移的DNA的形成不那么极端。这些数据表明,与SSB相关的单链区域之间的同源配对可能有助于不同分子之间的粘合。讨论了凝聚过程对基因转移实验和细胞辐射效应的意义。
DNA species which migrate extremely slowly in agarose gel electrophoresis may be formed from plasmid DNA containing radiation-induced single-strand breaks (ssbs). Postirradiation heat treatment in low ionic strength buffer and subsequent incubation with Mg2+ strongly enhanced the formation of these species. Electron micrographs taken after such treatment show numerous complex configurations containing DNA material from several plasmid molecules. Less extreme formation of slowly migrating DNA occurred without postirradiation heat treatment or Mg2+ incubation when the DNA was co-precipitated with calcium phosphate in a physiologically balanced buffer and incubated under conditions used for DNA-mediated gene transfer. The data suggest that homologous pairing between single-stranded regions formed in relation to ssbs may contribute to cohesion between different molecules. The significance of the cohesion process for gene transfer experiments and cellular radiation effects is discussed.
特定 DNA 碱基损伤在 X 射线诱导噬菌体 PM2 失活中的作用。
DOI: 10.1016/0167-8817(85)90063-x
发表时间: 1985
期刊: Mutation research
影响因子: --
作者:
Moran,E;Wallace,SS
通讯作者: Wallace,SS
DOI: 10.1016/0006-291x(83)91191-9
发表时间: 1983
影响因子: 3.1
作者:
Wang,ML;Lee,AS
通讯作者: Lee,AS