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Updated: Aug 14, 2026

Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations
Published on: September 17, 2012
The cyclin B1 gene is actively transcribed during mitosis in HeLa cells
S Sciortino1, A Gurtner, I Manni
1Dipartimento di Oncologia Sperimentale, Istituto Regina Elena, Via delle Messi D'Oro 156, 00158 Rome, Italy.
Abstract:
In mammalian cells, the expression level of the cyclin B1 gene plays a critical role in the progression through mitosis. Here we demonstrate that the transcriptional activity of the human cyclin B1 promoter, as well as the rate of gene transcription, is high during mitosis. Indeed, the cyclin B1 promoter maintains an open chromatin configuration at the mitotic stage. Consistent with this, we show that the cyclin B1 promoter is occupied and bound to NF-Y during mitosis in vivo. Our results provide the first example of RNA polymerase II-dependent transcription during mitosis in mammalian cells.
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