Weibezahn K F, Coquerelle T
Nucleic Acids Res. 1981 Jul 10;9(13):3139-50. doi: 10.1093/nar/9.13.3139.
Using the method of filter elution of double stranded DNA under neutral conditions we have shown that most of gamma-ray induced double strand breaks (DSB) are rejoined in both mammalian and bacterial cells. Rejoining also occurs in the G1 phase in V79 Chinese hamster cells and under different growth conditions. Within 8 minutes at 37 C, half the breaks are rejoined. The rejoining in E. coli is equally fast and depends on the presence of DNA ligase. Some of the breaks in E. coli rejoin slowly, and these require rec+. The non-rejoined DSB are distributed over the DNA without any preference for the nucleosomal or the linker structure in the chromosome. Two kinds of DSB rejoining are discriminated, a fast process of DNA ligation and a slower process involving rec functions.
我们采用中性条件下双链DNA滤膜洗脱法,证明了在哺乳动物细胞和细菌细胞中,大多数γ射线诱导的双链断裂(DSB)均可重新连接。在V79中国仓鼠细胞的G1期以及不同生长条件下,重新连接也会发生。在37℃下8分钟内,一半的断裂会重新连接。大肠杆菌中的重新连接同样迅速,且依赖于DNA连接酶的存在。大肠杆菌中的一些断裂重新连接缓慢,这些需要rec +。未重新连接的DSB在DNA上随机分布,对染色体中的核小体或连接子结构没有任何偏好。可区分出两种DSB重新连接方式,一种是快速的DNA连接过程,另一种是涉及rec功能的较慢过程。