dc.contributor.author | Khodarev, N. N. | en |
dc.contributor.author | Narayana, A. | en |
dc.contributor.author | Constantinou, Andreas I. | en |
dc.contributor.author | Vaughan, A. T. M. | en |
dc.creator | Khodarev, N. N. | en |
dc.creator | Narayana, A. | en |
dc.creator | Constantinou, Andreas I. | en |
dc.creator | Vaughan, A. T. M. | en |
dc.date.accessioned | 2019-11-04T12:51:49Z | |
dc.date.available | 2019-11-04T12:51:49Z | |
dc.date.issued | 1997 | |
dc.identifier.issn | 1044-5498 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/53168 | |
dc.description.abstract | The size of supercoiled, topologically constrained DNA domains within the squamous carcinoma cell line SQ-20B were determined by direct comparison with a panel of irradiated supercoiled plasmid DNAs. Loss of supercoiling in plasmids was determined by gel electrophoresis and in cells by nucleoid flow cytometry. Comparison of dose-response data for plasmid relaxation with that obtained from SQ-20B cells enabled a direct estimation of supercoil target size in these cells. Plasmids pUCD9P (3.9 kbp), pXT-1 (10.1 kbp), pdBPV-MMT- neo (14.6 kbp), pRK290 (20.0 kbp), and R6K (38 kbp) were used and analyzed under the same exposure conditions as nucleoid DNA. Two sizes of topologically closed domains were found in nucleoids of 0.51 ± 0.17Mbp and 1.34 ± 0.3 Mbp. In an attempt to relate these large-scale organizations of DNA with function, cells were exposed to the DNA topoisomerase II inhibitor, VP16 and the G1/S cell cycle blocking agent mimosine. A 1 h exposure to VP16 was effective in reducing DNA synthesis which was associated with a parallel increase in nucleoid supercoiling. Addition of the G1 > S inhibitor mimosine enhanced both responses. It is concluded that chromosomes and interphase nuclei are organized into at least two sizes of topologically constrained domains of DNA which may have functional relevance to the control and execution of DNA synthesis. | en |
dc.source | DNA and cell biology | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031414573&partnerID=40&md5=a41d59a1f3540c8d5d8062c1d34c6274 | |
dc.subject | article | en |
dc.subject | etoposide | en |
dc.subject | human | en |
dc.subject | Humans | en |
dc.subject | priority journal | en |
dc.subject | squamous cell carcinoma | en |
dc.subject | human cell | en |
dc.subject | flow cytometry | en |
dc.subject | Enzyme Inhibitors | en |
dc.subject | gel electrophoresis | en |
dc.subject | irradiation | en |
dc.subject | eukaryotic cell | en |
dc.subject | dna | en |
dc.subject | DNA Topoisomerases, Type II | en |
dc.subject | G1 Phase | en |
dc.subject | Tumor Cells, Cultured | en |
dc.subject | dna synthesis | en |
dc.subject | gyrase inhibitor | en |
dc.subject | Plasmids | en |
dc.subject | DNA, Superhelical | en |
dc.subject | plasmid | en |
dc.subject | Carcinoma, Squamous Cell | en |
dc.subject | dna supercoiling | en |
dc.subject | Gamma Rays | en |
dc.subject | Herpes Simplex Virus Protein Vmw65 | en |
dc.subject | mimosine | en |
dc.subject | Nucleic Acid Conformation | en |
dc.title | Topologically constrained domains of supercoiled DNA in eukaryotic cells | en |
dc.type | info:eu-repo/semantics/article | |
dc.description.volume | 16 | |
dc.description.startingpage | 1051 | |
dc.description.endingpage | 1058 | |
dc.author.faculty | Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences | |
dc.author.department | Τμήμα Βιολογικών Επιστημών / Department of Biological Sciences | |
dc.type.uhtype | Article | en |
dc.description.notes | <p>Cited By :5</p> | en |
dc.source.abbreviation | DNA Cell Biol. | en |
dc.contributor.orcid | Constantinou, Andreas I. [0000-0003-0365-1821] | |
dc.gnosis.orcid | 0000-0003-0365-1821 | |