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Matrix association of early- and late-replicating chromatin studied by single-cell electrophoresis
Södertörn University, Avdelning Naturvetenskap. Karolinska Institute.
2002 (English)In: Biochimica et Biophysica Acta. Molecular Cell Research, ISSN 0167-4889, Vol. 1590, no 1-3, 103-108 p.Article in journal (Refereed) Published
Abstract [en]

CHO-K1 cells were synchronized at the G(1)/S border by mitotic shake-off and aphidicolin incubation. Pulse-labeling with tritium was done at 30 min, 2 or 5 h into the S-phase, with chase incubations for different times in non-radioactive medium. The cells were subjected to neutral microelectrophoresis to extend the DNA into "comets," after which the label was visualized through autoradiography. At zero chase time, all label was positioned in the head. The displacement of label into the tails increased with time, reaching a maximum at about 5 h after the pulse. A lag phase of 2 - 3 It was observed for the early-labeled cells before the displacement started. Also, more label was released after overnight serum starvation, but this was reversed through a 3-h incubation at normal growth conditions. It was found that late-replicating chromatin is organized in larger domains than early-replicating chromatin, and DNA polymerase seems to be an important organizer. Early-replicating chromatin has other important attachments to the nuclear matrix, dependent on metabolic activity.

Place, publisher, year, edition, pages
2002. Vol. 1590, no 1-3, 103-108 p.
National Category
Biochemistry and Molecular Biology Cell Biology
Identifiers
URN: urn:nbn:se:sh:diva-15801DOI: 10.1016/S0167-4889(02)00203-3ISI: 000176518700010PubMedID: 12063173ScopusID: 2-s2.0-0037067138OAI: oai:DiVA.org:sh-15801DiVA: diva2:508374
Available from: 2012-03-08 Created: 2012-03-07 Last updated: 2014-04-16Bibliographically approved

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Nygren, Jonas
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Avdelning Naturvetenskap
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