Regulation of cell proliferation is necessary for immune responses, tissue repair, and upkeep of organ function to maintain human health1. When proliferating cells complete mitosis, a fraction of newly born daughter cells immediately enter the next cell cycle, while the remaining cells in the same population exit to a transient or persistent quiescent state2. Whether this choice between two cell-cycle pathways is due to natural variability in mitogen signalling or other underlying causes is unknown. Here we show that human cells make this fundamental cell-cycle entry or exit decision based on competing memories of variable mitogen and stress signals. Rather than erasing their signalling history at cell-cycle checkpoints before mitosis, mother cells transmit DNA damage-induced p53 protein and mitogen-induced cyclin D1 (CCND1) mRNA to newly born daughter cells. After mitosis, the transferred CCND1 mRNA and p53 protein induce variable expression of cyclin D1 and the CDK inhibitor p21 that almost exclusively determines cell-cycle commitment in daughter cells. We find that stoichiometric inhibition of cyclin D1–CDK4 activity by p21 controls the retinoblastoma (Rb) and E2F transcription program in an ultrasensitive manner. Thus, daughter cells control the proliferation–quiescence decision by converting the memories of variable mitogen and stress signals into a competition between cyclin D1 and p21 expression. We propose a cell-cycle control principle based on natural variation, memory and competition that maximizes the health of growing cell populations.
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We thank K. Aoki and M. Matsuda for EKAR sensors, J. Stewart-Ornstein and G. Lahav for the p21-and p53-tagged MCF7 cell line, J. Ferrell, K. Cimprich, S. Collins, A. Hayer, S. Cappell, L. Pack, C. Liu, Y. Fan, L. Daigh, A. Jaimovich and S. Spencer for discussions, and the Stanford Shared FACS Facility for cell sorting. This work was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2013R1A6A3A03025832) and NIGMS R01 grants (GM11837, GM063702 and PGM107615).
The authors declare no competing financial interests.
Reviewer Information Nature thanks R. Medema, J. Purvis and A. Raj for their contribution to the peer review of this work.
Publisher's note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended data figures and tables
Extended Data Figure 1 ERK activity in G2 and G0/G1 regulates CDK2inc and CDK2delay paths, respectively.
Single-cell CDK2 activity traces. Cells were selected if mitogens were transiently withdrawn for a 5 h period (marked in grey) ending 1–3 h before mitosis for G2 (left) or for a 5 h period starting 0–2 h after mitosis for G1 (right).
a, Representation of ERK activity time courses at different concentrations of mitogens. b, Examples of single-cell time courses of ERK activity. Automatic detection of indicated features of ERK activity. c, Averaged ERK features shown in b. MCF10A cells expressing ERK sensor were monitored for more than 18 h. Data are mean ± s.e.m. (n = 4 biological replicates). d, e, Correlation between ERK activity, integrated over 5 h, and the fraction of nuclear ERK phosphorylation (d) or the levels of nuclear cyclin D1 protein (e). f, Examples of CDK2 and ERK single-cell traces classified by CDK2 paths. g, Single-cell traces of CDK2 and ERK activity in response to inhibition of MEK (PD0325901; 100 nM) showing that a peak of ERK activation during mitosis was not suppressed by MEK inhibition.
a, Single-cell traces of CDK2 and ERK activities. Mitogens were withdrawn 0–2 h after mitosis. b, Box plot of mean ERK activity during the G2 or G0/G1 phases based on CDK2 classification. The higher ERK activity in CDK2delay cells during G0/G1 compared to CDK2low cells suggests that ERK activity in G0/G1 regulates the delayed entry into the cell cycle. Yellow lines indicate the median, boxes denote the 25th and 75th percentiles, lines denote the total range for each population (n = 2,896 cells). c, Examples of ERK single-cell traces classified by CDK2 paths in daughter cells. d, Bar graph of differences in integrated ERK activity during the G0/G1 phases based on CDK2 classification. Corresponding fold changes in cyclin D1 were calculated based on Extended Data Fig. 2e. Data are mean ± s.d. (n = 3 biological replicates). e, Analysis of the fraction of daughter pairs from the same and different mothers that have the same CDK2 path. Data are mean ± s.d. (n = 24 wells (each well; n > 100 cells)). f, g, Odds ratio analysis showing how well the percentile of ERK activity in G2 for varying mitogen availability (f) and temporal proximity to mitosis (g) predicts cell-cycle entry in daughter cells. Strong prediction values are shown in blue, and random chance is marked as a purple dashed line. Data are mean ± s.d. (n = 3 (f) and n = 2 (g) biological replicates).
Extended Data Figure 4 p53 signalling in mother cells controls the CDK2inc path in daughter cells through p21.
a, Single-cell CDK2 activity traces aligned to the time of mitosis in MCF7 cells. b, c, CDK2 activity traces aligned to the time of mitosis after siRNA knockdown of p53 or control siRNA (b) or in wild-type and p53-knockout (TP53−/−) cell lines (c). d, e, CDK2 activity traces of cells exposed to 1 h application of p53 activator (10 μM nutlin-3, 10 μM tenovin-6) 2–3 h before mitosis (marked in grey) in a wild-type cell line (d) or in a p21-knockout (CDKN1A−/−) cell line (e). f, Cumulative distribution functions of S/G2/M duration (time between geminin rising point and mitosis) as a function of the strength of a 20-min NCS pulse. MCF10A cells expressing the Fucci (geminin) reporter were pre-imaged for 13 h, then treated with the indicated concentration of NCS for 20 min and imaged for a further 48 h. Cells were selected when NCS was applied during S/G2 phase (control, n = 645 cells; 10 ng ml−1 NCS, 786 cells; 50 ng ml−1 NCS, 1,314 cells; 200 ng ml−1 NCS, 471 cells). g, Examples of CDK2 activity traces in response to a 20-min NCS pulse (200 ng ml−1) or a control pulse applied 9–11 h before mitosis in Fig. 2d.
a, An example of cell phase gating using Hoechst and 5-ethynyl-20-deoxyuridine (EdU) staining. b, c, Box plot of nuclear 53BP1 (b) and γH2AX (c) puncta area in different cell-cycle phases with and without addition of a 20-min NCS (200 ng ml−1) pulse 8 h before fixation. Boxes reflect the 25th and 75th percentiles, whiskers denote the total range (53BP1; n > 2,800, γH2AX; n > 3,000 cells for each condition). d, Representative images of γH2AX and 53BP1 staining 8 h after a pulse of NCS (200 ng ml−1) for 20 min. Scale bar, 20 μm. e, Classification of CDK2inc and CDK2low cells after mitosis. f, Plot of nuclear γH2AX puncta area as a function of time relative to mitosis in unperturbed cells. Data are mean ± s.e.m. (n = 4 biological replicates). g, Histogram of nuclear Rb (Ser807/S811) intensity. h, Comparison of the E2F1 mRNA abundance by nuclear Rb (Ser807/S811) status (E2F1 is an E2F target). Data are mean ± s.d. (n = 10 wells (each well; n > 500 cells)). i, After selecting cells based on time since mitosis, G0/G1 cells were gated using Hoechst and EdU staining (top), and then cells in G0/G1 were further classified into hypo- or hyper-Rb population (bottom). j, Bar graph of nuclear γH2AX and 53BP1 puncta area. Data are mean ± s.e.m. (control; n = 4, NCS; n = 3 biological replicates). P values were calculated by unpaired two-tailed t-tests.
Extended Data Figure 6 Inhibition of the DNA-damage sensing ATM, ATR and DNA-PK kinases in daughter cells does not regulate CDK2inc path selection.
a, CDK2 activity traces of cells exposed to inhibitors of ATM (5 μM KU-60019), ATR (2 μM AZ-20), and DNA-PK (1 μM NU-7441) (marked in grey), starting 5 h after a control pulse or a 20-min NCS pulse (marked in purple). Cells undergoing mitosis within 1 h before drug treatment were selected for analysis. b, Averaged p21 intensity traces in response to a 20-min NCS pulse (200 ng ml−1) in MCF7 cells. Cells were selected for which NCS was applied during a 4-h time window after mitosis. Data are mean ± 95% confidence intervals (n = 79 cells).
a, Control and additional experiments to Fig. 3d. CDK2 activity traces of cells exposed to a control pulse or a 20-min NCS pulse (10 ng ml−1, marked in purple), followed by a 5-h incubation in different concentrations of mitogens (marked in grey). After the 5-h incubation, cells were replenished with full growth media. Cells undergoing mitosis within 1 h of replacement with full growth media were selected. b, Individual traces of CDK2 activity showing the time window when mitogens were withdrawn or MEK inhibited (100 nM PD0325901) for 5 h until cells were fixed (marked in grey). Cells that were fixed during the first 2 h after mitosis were selected. c, Percentage of hyper-Rb (Ser807/S811) in response to mitogen withdrawal and MEK inhibition. Data are mean ± s.d. (n = 2 biological replicates). d, Representative images of mRNA and protein levels of cyclin D1 (CCND1) and p21 (CDKN1A) after a 5-h period of mitogen withdrawal or MEK inhibition. Scale bar, 50 μm. e, mRNA and nuclear protein levels of p21 in response to mitogen withdrawal and MEK inhibition. Data are mean ± s.d. (n = 2 biological replicates). f, Expression level of nuclear cyclin D1 protein, normalized by initial level (time 0 h), in response to the translation inhibitor, cycloheximide (10 μg ml−1) (n = 2 biological replicates). g, Cyclin D1 protein (left) and mRNA (CCND1; right) levels, normalized by initial level (time 0 h), after mitogen withdrawal. The half-life of CCND1 mRNA was measured with or without the transcription inhibitor actinomycin D (ActD; 5 μg ml−1) (n = 2 biological replicates).
a, Individual traces of CDK2 activity showing the time window when a 20-min NCS pulse (200 ng ml−1) (marked in grey) was applied to mother cells. Cells that were fixed during the first 2 h after mitosis were selected. b, Percentage of hyper-Rb (Ser807/S811). Data are mean ± s.d. (n = 4 biological replicates). c, Representative images of cyclin D1 (CCND1) mRNA and protein levels, and p21 (CDKN1A) mRNA and protein levels after a 20-min pulse of NCS. Scale bar, 50 μm. d, mRNA and nuclear protein levels of cyclin D1 in G1 phase after exposure of mother cells to a 20-min pulse of NCS (200 ng ml−1). Data are mean ± s.d. (n = 2 biological replicates). e–g, Expression levels of nuclear p21 (CDKN1A) mRNA (e) and protein (f), and p53 protein (g), normalized by initial level (time 0 h). Cells were treated with either cycloheximide (10 μg ml−1) or ActD (5 μg ml−1), within 1 h of the application of the 20-min pulse of the indicated concentration of NCS (n = 2 biological replicates).
a, Single-cell traces of CDK2 activity after siRNA knockdown of cyclins D1, D2 and D3 (combined), siRNA knockdown of p21, or control siRNA. b, c, Chemical-induced rapid expression of cyclin D1 or p21 controls the CDK2 paths in daughter cells. b, Schematic of chemical-induced DHFR-mCherry-cyclin D1 or DHFR-mCherry-p21 constructs. c, CDK2 activity traces aligned to the time of mitosis. Only cells that were treated with DMSO, 0.05 μM TMP or 5 μM TMP 1–5 h before mitosis (marked in yellow) were selected for plotting. Note that TMP was not washed out (marked in grey).
a, Histograms of the calibrated cyclin D1/p21 ratio in CDK2inc and CDK2low cells during a 2–4 h time window after mitosis (CDK2inc; n = 2,162, CDK2low; n = 932 cells). b–d, Histogram of Rb (Ser807/811) (b), histogram of nuclear cyclin D1 and p21 protein (c), and nuclear cyclin D1–p21 map colour-coded by percentage of hyper-Rb (Ser807/811) (d, top) and relative density (d, bottom) after 5 h incubation of the indicated mitogen concentration. e, Percentage of hyper-Rb (Ser807/S811) as a function of the nuclear cyclin D1/p21 ratio at three different fixed concentrations of p21. Intermediate and high p21 levels are twofold and fivefold relative to low p21 level, respectively. The data show a clear increase in ultrasensitivity for higher absolute p21 levels.
Top: time-lapse microscopy of DHB-mCherry and processed ERK images. Bottom: traces of Cdk2 activity (green) and ERK activity (Red). Scale bar is 10 µm. (MOV 4117 kb)
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Yang, H., Chung, M., Kudo, T. et al. Competing memories of mitogen and p53 signalling control cell-cycle entry. Nature 549, 404–408 (2017). https://doi.org/10.1038/nature23880
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