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A more recent version of this article appeared on March 1, 2003
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Submitted on October 19, 2002
Revised on November 9, 2002
Accepted on November 22, 2002
1 Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, New York 11724
* Corresponding author. E-mail address: spector{at}cshl.org.
In eukaryotic cells, RNA polymerase II (RNA pol II) transcription and pre-mRNA processing are coordinated events. We have addressed how individual components of the transcription and pre-mRNA processing machinery are organized during mitosis and subsequently recruited into the newly formed daughter nuclei. Interestingly, localization studies of numerous RNA pol II transcription and pre-mRNA processing factors revealed a non-random and sequential entry of these factors into daughter nuclei after nuclear envelope/lamina formation. The initiation competent form of RNA pol II and general transcription factors appeared in the daughter nuclei simultaneously, but prior to pre-mRNA processing factors, whereas the elongation competent form of RNA pol II was detected even later. The differential entry of these factors rules out the possibility that they are transported as a unitary complex. Telophase nuclei were competent for transcription and pre-mRNA splicing concomitant with the initial entry of the respective factors. In addition, our results revealed a low turnover rate of transcription and pre-mRNA splicing factors during mitosis. We provide evidence to support a model in which the entry of the RNA pol II gene expression machinery into newly forming daughter nuclei is a staged and ordered process.
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