Chromatin dynamics is correlated with replication timing.
Discrete chromatin domains (ChrD), containing an average of approximately 1 Mbp DNA, represent the basic structural units for the regulation of DNA organization and replication in situ. In this study, a bio-computational approach is employed to simultaneously measure the translational motion of large populations of ChrD in the cell nucleus of living cells. Both movement and configurational changes are strikingly higher in early S-phase replicating ChrD compared to those that replicate in mid and late S-phase. The chromatin dynamics was not sensitive to transcription inhibition by alpha-amanitin but was significantly reduced by actinomycin D treatment. Since a majority of active genes replicate in early S-phase, our results suggest a correlation between levels of chromatin dynamics and chromatin poised for active transcription. Analysis of ChrD colocalization with transcription sites and cDNA with ChrD and transcription sites further supports this proposal.
Pliss
Artem
A
Department of Biological Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA.
Malyavantham
Kishore
K
Bhattacharya
Sambit
S
Zeitz
Michael
M
Berezney
Ronald
R
D053959:Alpha-Amanitin / Q000494:pharmacology; D002232:Carbocyanines / Q000737:chemistry; D002467:Cell Nucleus / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D002843:Chromatin / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D045584:Chromosome Positioning / Q000187:drug effects; D004261:DNA Replication / Q000187:drug effects / Q000235:genetics*; D003609:Dactinomycin / Q000494:pharmacology; D003856:Deoxyuracil Nucleotides / Q000737:chemistry / Q000378:metabolism; D015870:Gene Expression; D006367:HeLa Cells; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007700:Kinetics; D008845:Microinjections; D008856:Microscopy, Fluorescence; D016196:S Phase; D013997:Time Factors
D053959:Alpha-Amanitin; D002232:Carbocyanines; D002843:Chromatin; D003856:Deoxyuracil Nucleotides; C089187:cyanine dye 3; C027078:deoxyuridine triphosphate; D003609:Dactinomycin