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Monitoring the replication of structured DNA through heritable epigenetic change.
DNA can adopt non-B form structures that create significant blocks to DNA synthesis and seeking understanding of the mechanisms cells use to resolve such impediments continues to be a very active area of research. However, the ability to monitor the stalling of DNA synthesis at specific sites in the genome in living cells, of central importance to elucidating these mechanisms, poses a significant technical challenge. Replisome stalling is often transient with only a small fraction of events leading to detectable genetic changes, making traditional reporter assays insensitive to the stalling event per se. On the other hand, the imprint stalling leaves on the epigenome can be exploited as a form of biological 'tape recorder' that captures episodes of fork stalling as heritable changes in histone modifications and in transcription. Here we describe a detailed protocol for monitoring DNA structure-dependent epigenetic instability of the BU-1 locus in the avian cell line DT40, which has proved a sensitive tool for understanding the mechanisms by which structured DNA is replicated in a vertebrate system.
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