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Two different chromatin structures coexist in ribosomal RNA genes throughout the cell cycle.
Conconi A, Widmer RM, Koller T, Sogo JM. Conconi A, et al. Cell. 1989 Jun 2;57(5):753-61. doi: 10.1016/0092-8674(89)90790-3. Cell. 1989. PMID: 2720786
It is shown that in intact cells, two distinct types of ribosomal chromatin coexist in Friend cells, one that contains nucleosomes and represents the inactive copies and one that lacks a repeating structure and corresponds to the transcribed genes. A single gene cop …
It is shown that in intact cells, two distinct types of ribosomal chromatin coexist in Friend cells, one that contains nucleosomes and repre …
UV-induced DNA damage and DNA repair in ribosomal genes chromatin.
Pelloux J, Tremblay M, Wellinger RJ, Conconi A. Pelloux J, et al. Methods Mol Biol. 2012;809:303-20. doi: 10.1007/978-1-61779-376-9_21. Methods Mol Biol. 2012. PMID: 22113285
Yeast is used as a model system and the methods employed are as follows: nuclei isolation, restriction enzyme digestion of chromatin to release active rRNA genes, psoralen cross-linking, T4-endonuclease-V enzyme to detect CPDs and CPDs repair over relatively large stretche …
Yeast is used as a model system and the methods employed are as follows: nuclei isolation, restriction enzyme digestion of chromatin …
Repair-independent chromatin assembly onto active ribosomal genes in yeast after UV irradiation.
Conconi A, Paquette M, Fahy D, Bespalov VA, Smerdon MJ. Conconi A, et al. Mol Cell Biol. 2005 Nov;25(22):9773-83. doi: 10.1128/MCB.25.22.9773-9783.2005. Mol Cell Biol. 2005. PMID: 16260595 Free PMC article.
We analyzed NER in ribosomal genes (rDNA), which are present in multiple copies but only a fraction are actively transcribed and nonnucleosomal. ...
We analyzed NER in ribosomal genes (rDNA), which are present in multiple copies but only a fraction are actively transcribed and nonn …
Psoralen photocrosslinking, a tool to study the chromatin structure of RNA polymerase I--transcribed ribosomal genes.
Toussaint M, Levasseur G, Tremblay M, Paquette M, Conconi A. Toussaint M, et al. Biochem Cell Biol. 2005 Aug;83(4):449-59. doi: 10.1139/o05-141. Biochem Cell Biol. 2005. PMID: 16094448 Review.
., lower eukaryotes, plants, and animals, only a fraction of ribosomal genes are transcriptionally active. At the chromatin level inactive rDNA is assembled into arrays of nucleosomes, whereas transcriptionally active rDNA does not contain canonical nucleosomes. ...Thus, t …
., lower eukaryotes, plants, and animals, only a fraction of ribosomal genes are transcriptionally active. At the chromatin level ina …
Transcription-coupled repair in RNA polymerase I-transcribed genes of yeast.
Conconi A, Bespalov VA, Smerdon MJ. Conconi A, et al. Proc Natl Acad Sci U S A. 2002 Jan 22;99(2):649-54. doi: 10.1073/pnas.022373099. Epub 2002 Jan 8. Proc Natl Acad Sci U S A. 2002. PMID: 11782531 Free PMC article.
Ribosomal genes (rDNA) are present in multiple copies, but only a fraction of them is actively transcribed. Restriction enzyme digestion was used to specifically release the transcriptionally active fraction from yeast nuclei, and selective psoralen crosslinking was used t …
Ribosomal genes (rDNA) are present in multiple copies, but only a fraction of them is actively transcribed. Restriction enzyme digest …
Rapid changes in transcription and chromatin structure of ribosomal genes in yeast during growth phase transitions.
Fahy D, Conconi A, Smerdon MJ. Fahy D, et al. Exp Cell Res. 2005 May 1;305(2):365-73. doi: 10.1016/j.yexcr.2005.01.016. Exp Cell Res. 2005. PMID: 15817161
Changes in transcription may be influenced by an alteration in the number of active ribosomal genes and/or a change in the transcription rate of active genes. ...However, changes in the proportion of active genes during these transitions, although equally rapid, represente …
Changes in transcription may be influenced by an alteration in the number of active ribosomal genes and/or a change in the transcript …
Repair of UV induced DNA lesions in ribosomal gene chromatin and the role of "Odd" RNA polymerases (I and III).
Charton R, Guintini L, Peyresaubes F, Conconi A. Charton R, et al. DNA Repair (Amst). 2015 Dec;36:49-58. doi: 10.1016/j.dnarep.2015.09.007. Epub 2015 Sep 10. DNA Repair (Amst). 2015. PMID: 26411875 Review.
In fast growing eukaryotic cells, a subset of rRNA genes are transcribed at very high rates by RNA polymerase I (RNAPI). Nuclease digestion-assays and psoralen crosslinking have shown that they are open; that is, largely devoid of nucleosomes. ...
In fast growing eukaryotic cells, a subset of rRNA genes are transcribed at very high rates by RNA polymerase I (RNAPI). Nuclease dig …
Chromatin endogenous cleavage and psoralen crosslinking assays to analyze rRNA gene chromatin in vivo.
Griesenbeck J, Wittner M, Charton R, Conconi A. Griesenbeck J, et al. Methods Mol Biol. 2012;809:291-301. doi: 10.1007/978-1-61779-376-9_20. Methods Mol Biol. 2012. PMID: 22113284
Here, we provide a protocol to investigate the specific association of proteins with the two rRNA gene chromatin populations in vivo, using Saccharomyces cerevisiae as a model eukaryote....
Here, we provide a protocol to investigate the specific association of proteins with the two rRNA gene chromatin populations in vivo, …
Strand-specific modulation of UV photoproducts in 5S rDNA by TFIIIA binding and their effect on TFIIIA complex formation.
Liu X, Conconi A, Smerdon MJ. Liu X, et al. Biochemistry. 1997 Nov 4;36(44):13710-7. doi: 10.1021/bi9716736. Biochemistry. 1997. PMID: 9354642
DNA mobility shift and DNase I footprinting show a strong inhibition of TFIIIA binding to UV-damaged 5S rDNA. An average of approximately 2 cyclobutane pyrimidine dimers (CPDs) per 214 bp fragment, and a lesser amount of pyrimidine-pyrimidone (6-4) dimers, reduced t …
DNA mobility shift and DNase I footprinting show a strong inhibition of TFIIIA binding to UV-damaged 5S rDNA. An average of approxima …
DNase I and micrococcal nuclease analysis of the tomato proteinase inhibitor I gene in chromatin.
Conconi A, Ryan CA. Conconi A, et al. J Biol Chem. 1993 Jan 5;268(1):430-5. J Biol Chem. 1993. PMID: 8416948
Digestion of tomato nuclei with micrococcal nuclease, which produces a nucleosomal ladder from bulk chromatin in agarose gels, supported these observations. Micrococcal nuclease produced only a faint nucleosomal repeat superimposed on a smear for the coding r …
Digestion of tomato nuclei with micrococcal nuclease, which produces a nucleosomal ladder from bulk chromatin in agarose gels, suppor …
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