Peer Review History
| Original SubmissionOctober 14, 2025 |
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Dear Dr. Zhang, Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process. It is particularly important to address the concern that relates to the experimental design used for this study. Sampling was performed over a 24 hours period and was initiated immediately following the proposed clock synchronisation treatment. Therefore, it is currently not possible to conclude that the observed dynamic changes in gene expression relate to a rhythmic output of the circadian clock. It cannot be excluded that these changes reflect acute responses to the cell culture treatment. This point needs to be resolved by a longer sampling period that is delayed (by 24 hours) relative to the Dex treatment. Other critical points raised by both reviewers also need to be addressed. Please submit your revised manuscript by Jan 22 2026 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org . When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file.
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Foulkes, D.Phil Academic Editor PLOS One Journal Requirements: When submitting your revision, we need you to address these additional requirements. 1. Please ensure that your manuscript meets PLOS ONE's style requirements, including those for file naming. The PLOS ONE style templates can be found at https://journals.plos.org/plosone/s/file?id=wjVg/PLOSOne_formatting_sample_main_body.pdf and 2. Please note that PLOS One has specific guidelines on code sharing for submissions in which author-generated code underpins the findings in the manuscript. In these cases, we expect all author-generated code to be made available without restrictions upon publication of the work. Please review our guidelines at https://journals.plos.org/plosone/s/materials-and-software-sharing#loc-sharing-code and ensure that your code is shared in a way that follows best practice and facilitates reproducibility and reuse. 3. Please update your submission to use the PLOS LaTeX template. 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For example, authors should submit the following data: - The values behind the means, standard deviations and other measures reported; - The values used to build graphs; - The points extracted from images for analysis. Authors do not need to submit their entire data set if only a portion of the data was used in the reported study. If your submission does not contain these data, please either upload them as Supporting Information files or deposit them to a stable, public repository and provide us with the relevant URLs, DOIs, or accession numbers. For a list of recommended repositories, please see https://journals.plos.org/plosone/s/recommended-repositories. If there are ethical or legal restrictions on sharing a de-identified data set, please explain them in detail (e.g., data contain potentially sensitive information, data are owned by a third-party organization, etc.) and who has imposed them (e.g., an ethics committee). Please also provide contact information for a data access committee, ethics committee, or other institutional body to which data requests may be sent. If data are owned by a third party, please indicate how others may request data access. 5. If the reviewer comments include a recommendation to cite specific previously published works, please review and evaluate these publications to determine whether they are relevant and should be cited. There is no requirement to cite these works unless the editor has indicated otherwise. Additional Editor Comments: Major revision is required, in particular in order to support the conclusion that these rhythmic elements of the transcriptome reflect circadian clock functionality. Currently the sampling period is too short (24 hours) and the sampling starts immediate following Dex treatment. For this reason it is not possible to assess whether the observed changes reflect the consequences of the acute exposure to Dex exposure or whether they are clock regulated. The other comments made by both reviewers also need to be addressed in full. [Note: HTML markup is below. Please do not edit.] Reviewers' comments: Reviewer's Responses to Questions Comments to the Author 1. Is the manuscript technically sound, and do the data support the conclusions? Reviewer #1: Yes Reviewer #2: No ********** 2. Has the statistical analysis been performed appropriately and rigorously? -->?> Reviewer #1: Yes Reviewer #2: No ********** 3. Have the authors made all data underlying the findings in their manuscript fully available??> The PLOS Data policy Reviewer #1: No Reviewer #2: No ********** 4. Is the manuscript presented in an intelligible fashion and written in standard English??> Reviewer #1: Yes Reviewer #2: Yes ********** Reviewer #1: In their manuscript “Temporal dynamics and functional annotation of transcriptome rhythmicity in HEK293T cells”, the authors examine RNA expression patterns at six time points across 24 hours after synchronization of the cells by dexamethasone treatment. They identify enrichment of certain functions, such as mitochondrial translation and RNA splicing, in genes clustered into distinct phases, and observe that gene expression peaks progress from genes related to transcriptional control to those related to translation across the 24 h time period. When looking at differentially expressed genes between antiphase time points, they notice that most genes underlying these differences are rhythmically expressed based on MetaCycle analysis, and show enriched pathway functions such as vesicle trafficking or fatty acid metabolism. Data quality and analysis are sound, and the conclusions taken by the authors are valid. However, I have a few points that should be addressed prior to publication. Major points: A) The authors follow gene expression over 24 h only, thus only one circadian cycle. This means that their gene set will contain genes rhythmically expressed after DEX treatment, but also genes acutely induced by the treatment, especially in the first few hours after the treatment. For a more stringent identification of oscillating genes, the authors would have to follow expression over at least two cycles or 48 hours. The discussion section devoted to these issues (acute DEX-mediated induction of expression vs. rhythmic expression in response to core clock synchronization) should be expanded (Currently only: “Our 4-hour resolution sampling across 24 hours captures one cycle; extending to multiple cycles with denser sampling would refine phase and amplitude estimates and increase sensitivity for low-amplitude rhythms.” It would also help to distinguish acute effects of the DEX treatment from those brought about by synchronization of the clock, for example). B) The RNA sequencing data should be deposited in GEO (https://www.ncbi.nlm.nih.gov/geo/) or a similar public repository supporting MIAME-compliant data submissions. Please provide an accession number upon revision. Minor points: 1) “In mammals, approximately 43% of protein-coding genes exhibit rhythmic expression…”: The cited reference (No. 6) does not contain this information. Please provide a reference for this statement. 2) “CLOCK peaked 32–36 hours after dexamethasone synchronization, in agreement with previous reports (25).” This statement is in contradiction with the rest of the manuscript, where expression was followed only for 24 h after DEX treatment. 3) Figure 2 A: were there only two samples for CT12, or is there a close overlap of two samples? 4) “…and translation-related enzymes (MFMT, QRSL1) (Fig. 2E).” This should refer to panel 2F. 5) “…peaked between CT10 and CT12 (Fig. 2F),…” This should refer to panel 2G. 6) “Collectively, these findings establish time of day as a critical experimental variable in HEK293T cells and highlight the need for either strict phase control or phase-aware analyses to ensure reproducibility and accurate interpretation.” This is correct; however, under general culture conditions, cells will not be as strictly synchronized as upon DEX treatment or serum shock. It is thus not easy to establish phase control or phase awareness in praxis (unless one wants to always synchronize cells by DEX/serum shock, which represents a relatively harsh treatment in itself that may not be compatible with many other treatments). The authors should expand the discussion here a bit to reflect on these practical problems. 7) “At CT16, vesicular transport genes were strongly induced, including DNM1 (clathrin-mediated endocytosis), GBF1 (ARF1 activation and Golgi–ER recycling), SEC24A (COPII cargo selection), and HGS/VPS36 (ESCRT sorting), suggesting circadian control of membrane trafficking and receptor signaling capacity, such as glucocorticoid signaling (45).” As the glucocorticoid receptor is a nuclear receptor and not a membrane receptor, this statement is a bit confusing. Also, the cited reference only comments on membrane vesicles in the context of adrenocortical cells and increased release of steroids from these cells under stress, which is not applicable to the HEK239T cells. Please clarify and/or change references. Reviewer #2: The study by Zhang and colleagues addressed an important question regarding how HEK293 endogenous rhythms function. The authors highlighted the consequences of not considering time in experiments, which is highly relevant to the field. However, upon careful review of the methods, the current rhythm analyses are underpowered and susceptible to a high rate of false positives. The authors used uncorrected p-values to determine rhythmicity, resulting in a large number of rhythmic genes—close to half of the transcriptome. Based on this data, they also performed phase set enrichment analyses (PSEA), which similarly used uncorrected p-values. Overall, the manuscript’s conclusions are not supported by robust statistical analysis. Although the manuscript is well-written and presents a good idea, the conclusions drawn are insufficient. The authors should reanalyze their data while accounting for false discovery rates, consider using sine-wave-based methods to accurately estimate phase, and then perform PSEA. Additionally, they could use DEG analyses to identify truly arrhythmic processes, providing a balanced view of major processes that are either under temporal control or not. This could become a valuable resource for the scientific community. I also provide some other comments below. Introduction Add original studies to support the claims. For instance, reference 6 is a review. The authors should cite the original paper. M&M Usually, after dexamethasone synchronization, one should wait 24 hours to avoid the immediate GR-induced effects. In this setup, the authors proceed immediately after synchronization, which should be disclosed as a limitation. Additionally, the authors could select a few relevant genes and repeat the experiments, this time waiting 24 hours, to show that the induced effect is clock-mediated rather than GR-induced. The authors used only the metacycle package to estimate rhythmicity, which includes ARSER, JTK_Cycle, Lomb-Scargle, and meta2d. In this setup, it is likely that Meta2D incorporated JTK_Cycle and Lomb-Scargle methods. An important limitation of this approach is that these methods are not sine-wave based, making phase and amplitude estimation difficult. Specifically, the authors used the calculated phase for PSEA analysis. Importantly, using a sine-wave method in addition could help obtain high-resolution phase estimates, although the overlap between detection methods is often quite limited. In addition, all analyses were based on a standard p-value < 0.05, which, considering RNAseq data, could inflate the rhythm detection. In this case, a false-discovery rate is necessary. Since some of these methods have low statistical power, using a p-value < 0.01 could help reduce false positives. Not surprisingly, the authors report almost half of the transcriptome as rhythmic, which is likely due to the accumulation of false positives. The same issue applies to the PSEA analysis, as the authors used a p-value < 0.05. Here, a q-value should be used instead of < 0.05 to reduce false positives. Data processing for PSEA is unclear and not reproducible. This method produces a large number of biological processes, often overlapping. How was the merging or grouping of similar processes done? Based on the data shown in fig. 2I, this reviewer cannot replicate these findings with the information provided by the authors. Importantly, PSEA data is not included in the materials; this must be provided. Results The authors should consider using a sine-wave baseline method for the clock genes to better assess the classic anti-phase relationship. Surprisingly, DBP, a high-amplitude gene, is not rhythmic. The phase shown in D could be better represented with a rose plot. The results from Fig. 2J need to be reanalyzed, accounting for false discoveries as described above. It is confusing to evaluate rhythmicity using a combination of methods and then perform DEG analyses, which is not suitable for circadian studies. In this current format, I believe this type of analysis does not contribute the story and instead introduces additional confusion. Although the authors attempted to evaluate the potential overlap between PSEA and DEG analyses, it remains unclear how similar or different the outcomes are. An important aspect missing from this paper is focusing on the arrhythmic portion. For example, the authors could assess rhythmicity—now accounting for false discovery rates—and perform DEG analysis specifically within the arrhythmic part of the transcriptome. This approach would identify the main genes and pathways that are time-independent. Subsequently, they could conduct rhythm analysis to identify genes and pathways that are time-dependent. Comparing these results would allow the authors to suggest a list of processes that are either time-dependent or time-independent. ********** what does this mean? ). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy Reviewer #1: No Reviewer #2: No ********** [NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". 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| Revision 1 |
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<p>Temporal dynamics and functional annotation of transcriptome rhythmicity in HEK293T cells PONE-D-25-55405R1 Dear Dr. Zhang, We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements. Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication. An invoice will be generated when your article is formally accepted. Please note, if your institution has a publishing partnership with PLOS and your article meets the relevant criteria, all or part of your publication costs will be covered. Please make sure your user information is up-to-date by logging into Editorial Manager at Editorial Manager® and clicking the ‘Update My Information' link at the top of the page. For questions related to billing, please contact billing support . If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. Kind regards, Nicholas S. Foulkes, D.Phil Academic Editor PLOS One Additional Editor Comments (optional): Reviewers' comments: |
| Formally Accepted |
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PONE-D-25-55405R1 PLOS One Dear Dr. Zhang, I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS One. Congratulations! Your manuscript is now being handed over to our production team. At this stage, our production department will prepare your paper for publication. This includes ensuring the following: * All references, tables, and figures are properly cited * All relevant supporting information is included in the manuscript submission, * There are no issues that prevent the paper from being properly typeset You will receive further instructions from the production team, including instructions on how to review your proof when it is ready. Please keep in mind that we are working through a large volume of accepted articles, so please give us a few days to review your paper and let you know the next and final steps. Lastly, if your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. You will receive an invoice from PLOS for your publication fee after your manuscript has reached the completed accept phase. If you receive an email requesting payment before acceptance or for any other service, this may be a phishing scheme. Learn how to identify phishing emails and protect your accounts at https://explore.plos.org/phishing. If we can help with anything else, please email us at customercare@plos.org. Thank you for submitting your work to PLOS ONE and supporting open access. Kind regards, PLOS ONE Editorial Office Staff on behalf of Dr. Nicholas S. Foulkes Academic Editor PLOS One |
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