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How transcription of individual genes is regulated in a single, intact, three-dimensionally organized cell nucleus remains mysterious. Recently, live cell imaging has become an essential tool to dissect the in vivo mechanisms of gene transcription. It not only examines functions of transcription factors at their gene targets within the chromatin context, but it also provides a non-disruptive approach...
Transcription activation causes dramatic changes in a gene's compaction and macromolecular associations and, in some cases, triggers the translocation of the gene to a nuclear substructure. Here, we evaluate the location, movement, and transcriptional dynamics of Drosophila heat shock (HS) genes both by two-photon microscopy in live polytene nuclei and by FISH in diploid nuclei. The different HS loci...
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