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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Local nucleosome motion remains broadly similar through G1, S and G2, even as a cell copies its genome and its nucleus expands. A study by Yu Nagata and colleagues, published in Journal of Cell Science on 7 October 2026 (DOI 10.1242/jcs.265367), measured individual nucleosomes in living human cells. The researchers found a stable average baseline during ordinary interphase, with a modest elevation in early G1 reported in the detailed preprint. Transcription inhibition, replication stress and DNA damage all increased motion, showing that cells can deliberately shift chromatin dynamics when conditions demand it.
What the study found across G1, S and G2
Interphase comprises G1, S and G2. Cells grow in G1, duplicate their DNA in S phase and prepare for division in G2. Because DNA content approximately doubles during this interval and the nucleus grows, one might expect local chromatin to become progressively more crowded or less mobile.
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That is not what Nagata’s team observed. In asynchronously growing HeLa and HCT116 human cell lines, the average local movement of nucleosomes stayed nearly constant across interphase. The preprint’s distribution and mean-square-displacement analyses qualify that headline result: early G1 showed a modestly higher mean-square displacement, while the remainder of interphase clustered around a similar baseline.
| Interphase stage | What happens to DNA | Observed local nucleosome motion |
|---|---|---|
| G1 | Cell grows before replication | Broadly stable; modest elevation in early G1 in the preprint |
| S | DNA is replicated and total DNA content rises | Remains near the interphase baseline on the measured local, subsecond scale |
| G2 | Replicated genome is prepared for mitosis | Remains near the same average level |
Why stable motion is surprising and useful
The physical environment around a nucleosome changes as the genome is duplicated and the nucleus enlarges. Yet the measured local movement does not drift in proportion to DNA amount or nuclear volume. The authors interpret this as evidence that cells preserve comparable local physical conditions for routine genome maintenance, including transcription, replication and DNA repair.
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This is a local-mechanics result, not a claim that the whole genome is static. A nucleosome can move within its immediate chromatin neighborhood while chromosomes, domains and nuclear compartments undergo slower or larger-scale rearrangements.
How the researchers tracked nucleosomes in living cells
Cell-cycle classification without prolonged synchronization
HeLa and HCT116 cells expressed Fucci cell-cycle probes. Fucci signals identify progression through G1, S and G2 in living cells, allowing measurements in an asynchronously growing population rather than relying on an extended drug-synchronization protocol that could itself perturb chromatin.
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Two labels for different chromatin contexts
- H2B-HaloTag: labels bulk nucleosomes and provides a broad measure of chromatin motion.
- H3.3-HaloTag: marks nucleosomes enriched in euchromatin and Hi-C A compartments, regions generally associated with more active genomic environments.
Single-nucleosome fluorescence imaging was performed on a subsecond timescale. The analysis used mean-square displacement together with motion-distribution measurements, so the result reflects both average movement and how individual trajectories are distributed.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesEuchromatin moves more, but keeps the same phase pattern
H3.3-labelled nucleosomes were more mobile than the bulk H2B-labelled population. That difference is consistent with distinct chromatin environments: euchromatin-associated regions are less compact on average and support active genomic functions. Crucially, the higher H3.3 mobility also stayed nearly constant from phase to phase. The study therefore separates two ideas that are easy to conflate: chromatin context changes the baseline level of motion, while ordinary interphase progression does not substantially reset that level.
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When cells increase local DNA motion
Transcription inhibition
Blocking transcription increased nucleosome motion throughout interphase. This shows that the steady baseline is not an unavoidable property of chromatin; it can be altered when a major nuclear activity is disrupted.
Replication stress
Hydroxyurea was used to induce replication stress. Under that condition, average local motion increased, indicating that stalled or challenged replication changes chromatin dynamics beyond the routine S-phase state.
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DNA damage
Cisplatin-induced DNA damage also increased motion. Kazuhiro Maeshima described this as a possible way for cells to create more dynamic local conditions for ad hoc tasks such as recruiting DNA-repair factors. The experiments support a model with a maintained housekeeping baseline and a responsive, higher-mobility state when repair or other emergency work is needed.
What the result does—and does not—show
- Supported: average local, subsecond nucleosome motion is broadly stable through interphase in the tested living human cell lines.
- Supported: DNA content can rise roughly twofold while this local motion remains near its baseline.
- Supported: euchromatin-associated H3.3 nucleosomes move more than bulk H2B nucleosomes, yet retain a similar phase-to-phase pattern.
- Not established: that every cell type or organism has identical dynamics.
- Not established: that chromosome-scale movements, nuclear rearrangements or minute-to-hour behavior are unchanged.
- Not established: a universal numerical speed or percentage change; the available report provides qualitative stability rather than one headline motion value.
These boundaries matter when comparing this work with other chromatin-dynamics studies. The relevant variables include spatial scale (single nucleosome versus chromosome), time window (subsecond versus minutes), cell-cycle handling (Fucci classification versus synchronization), chromatin marker (H2B versus H3.3) and whether cells are untreated or under stress.
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Why the finding matters for cell biology
A cell must duplicate DNA, transcribe genes and repair damage without allowing local chromatin behavior to become progressively unsuitable as the nucleus changes size. The observed stability suggests that chromatin organization is regulated to preserve a workable physical regime during routine interphase. At the same time, the response to transcriptional blockade, replication stress and cisplatin damage shows that this regime is adjustable rather than fixed.
In Nagata’s words, local DNA motion is maintained at a surprisingly similar level even while DNA is being duplicated and the nucleus grows. The next questions are whether the same control principle applies in other cell types, how it operates at larger genomic scales and which molecular mechanisms produce the rapid mobility increase after damage.
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