ArticleThe Journal of cell biology1996
The rDNA transcription machinery is assembled during mitosis in active NORs and absent in inactive NORs.
Article in The Journal of cell biology, 1996. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 111 papers.
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Who cites it
111 citing papers in PubMed, 263 citations in OpenAlex.
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- Molecular conflicts disrupting centromere maintenance contribute to Xenopus hybrid inviability.Current biology : CB · 2022Article
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- Review
- Impaired function of rDNA transcription initiation machinery leads to derepression of ribosomal genes with insertions of R2 retrotransposon.Nucleic acids research · 2022Article
- Establishment and Maintenance of Open Ribosomal RNA Gene Chromatin States in Eukaryotes.Methods in molecular biology (Clifton, N.J.) · 2022Review
- The human ribosomal DNA array is composed of highly homogenized tandem clusters.Genome research · 2021Article
- The nucleolus as a multiphase liquid condensate.Nature reviews. Molecular cell biology · 2021Review
- Argentic staining reveals changes in cerebellar tissue organisation by prenatal glucocorticoid administration in rats.Histology and histopathology · 2021Article
- NORs on human acrocentric chromosome p-arms are active by default and can associate with nucleoli independently of rDNA.Proceedings of the National Academy of Sciences of the United States of America · 2020Article
51 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In cycling cells, the rDNAs are expressed from telophase to the end of G2 phase. The early resumption of rDNA transcription at telophase raises the question of the fate of the rDNA transcription machinery during mitosis. At the beginning of mitosis, rDNA transcription is arrested, and the rDNAs are clustered in specific chromosomal sites, the nucleolar organizer regions (NOR). In human cells, we demonstrate that the rDNA transcription machinery, as defined in vitro, is colocalized in some NORs and absent from others whatever the mitotic phase: RNA polymerase I and the RNA polymerase I transcription factors, upstream binding factor and promoter selectivity factor (as verified for TATA-binding protein and TATA-binding protein-associated factor for RNA polymerase I [110]), were colocalized in the same NORs. The RNA polymerase I complex was localized using two different antibodies recognizing the two largest subunits or only the third largest subunit, respectively. These two antibodies immunoprecipitated the RNA polymerase I complex in interphase cells as well as in mitotic cells. These results clearly indicated that the RNA polymerase I complex remained assembled during mitosis. In addition, RNA polymerase I and the transcription factors varied in the same proportions in the positive NORs, suggesting stoichiometric association of these components. The fact that the rDNA transcription machinery is not equally distributed among NORs most likely reflects the implication of the different NORs during the subsequent interphase. Indeed, we demonstrate that only positive NORs exhibit transcription activity at telophase and that the level of transcription activity is related to the amount of rDNA transcription machinery present in the NOR. We propose that assembly of rDNA transcription machinery preceding mitosis determines expression of the rDNAs at the beginning of the next cell cycle. Consequently, the association of rDNAs with the rDNA transcription machinery defines the "active" NORs and the level of activity at the transition telophase/interphase.
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