Replication strand preference for deletions associated with DNA palindromes

Replication strand preference for deletions associated with DNA palindromes
复制标题

复制链对与 DNA 回文相关的删除的偏好

DOI:
--
复制
发表时间:
1998
影响因子:
3.6
通讯作者:
D. Leach
D. Leach
中科院分区:
生物学2区
文献类型:
--
作者:
D. Pinder;C. Blake;J. Lindsey;D. Leach

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我们已经在大肠杆菌中分离并测序了一组受DNA回文刺激的缺失。所有的缺失相对于亲本序列是不对称的,并且都发生在短的直接重复中。这与DNA复制过程中链滑移的缺失是一致的。这种缺失产物中的不对称性的取向是链滑动事件的方向的诊断。因此,当复制方向已知时,还可以诊断其出现在复制叉子的前导或滞后链上。在所有可以确定相对于DNA复制的不对称的方向的情况下,产物与在叉子的滞后链上的缺失的偏好一致。这些数据包括三种情况下的复制滑移:在大肠杆菌的染色体上,在噬菌体λ中,在高拷贝数的pUC基质粒中。
We have isolated and sequenced a set of deletions stimulated by DNA palindromes in Escherichia coli. All of the deletions are asymmetric with respect to the parental sequence and have occurred at short direct repeats. This is consistent with deletion by strand slippage during DNA replication. The orientation of the asymmetry in such deletion products is diagnostic of the direction of the strand slippage event. It is therefore also diagnostic of its occurrence on the leading or lagging strand of the replication fork when the direction of replication is known. In all cases in which the orientation of the asymmetry could be determined with respect to DNA replication, the products were consistent with a preference for deletion on the lagging strand of the fork. The data include replication slippage in three situations: on the chromosome of E. coli, in bacteriophage λ and in high‐copy‐number pUC‐based plasmids.
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