Transcriptional suppression of ribosomal DNA with phase separation.

Transcriptional suppression of ribosomal DNA with phase separation.
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DOI:
10.1126/sciadv.abb5953
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发表时间:
2020-10
期刊:
影响因子:
13.6
通讯作者:
Maeshima K
Maeshima K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ide S;Imai R;Ochi H;Maeshima K

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Single-molecule imaging and tracking reveal how rRNA transcription is regulated by phase separation in the nucleolus. The nucleolus is a nuclear body with multiphase liquid droplets for ribosomal RNA (rRNA) transcription. How rRNA transcription is regulated in the droplets remains unclear. Here, using single-molecule tracking of RNA polymerase I (Pol I) and chromatin-bound upstream binding factor (UBF), we reveal suppression of transcription with phase separation. For transcription, active Pol I formed small clusters/condensates that constrained rDNA chromatin in the nucleolus fibrillar center (FC). Treatment with a transcription inhibitor induced Pol I to dissociate from rDNA chromatin and to move like a liquid within the nucleolar cap that transformed from the FC. Expression of a Pol I mutant associated with a craniofacial disorder inhibited transcription by competing with wild-type Pol I clusters and transforming the FC into the nucleolar cap. The cap droplet excluded an initiation factor, ensuring robust silencing. Our findings suggest a mechanism of rRNA transcription suppression via phase separation of intranucleolar molecules governed by Pol I.
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