Cell cycle‐regulated histone gene expression in synchronized plant cells

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<jats:title>Summary</jats:title><jats:p>The regulation of histone gene expression during the cell cycle has been studied in a synchronized tobacco (BY2) cell suspension. Maximal expression was found in S phase but unlike other eukaryotic organisms the amount of histone mRNA was not coupled to DNA synthesis. Using aphidicolin as an inhibitor of DNA synthesis either before or at mid‐S phase an accumulation of histone mRNAs was found in the absence of any DNA synthesis which was not due to a stabilization of the mRNAs but to actual control at the transcriptional level. At the completion of unperturbed or delayed S phase, histone mRNAs were selectively degraded by a post‐transcriptional mechanism requiring <jats:italic>de novo</jats:italic> transcription.</jats:p>

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