PNAS Pre-Submission Checklist: What to Verify Before Upload
Before you submit to PNAS, use this checklist to verify significance, data requirements, and the specific items editors evaluate after the 2022 editorial reforms.
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Specializes in manuscript preparation and peer review strategy for oncology and cell biology, with deep experience evaluating submissions to Nature Medicine, JCO, Cancer Cell, and Cell-family journals.
Readiness scan
Before you submit to PNAS (Proceedings of the National Academy of Sciences), pressure-test the manuscript.
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How to use this page well
These pages work best when they behave like tools, not essays. Use the quick structure first, then apply it to the exact journal and manuscript situation.
Question | What to do |
|---|---|
Use this page for | A working artifact you can actually apply to the manuscript or response package. |
Start with | Fill the template with real manuscript-specific details instead of leaving it generic. |
Common mistake | Copying the structure without tailoring the logic to the actual submission. |
Best next step | Use the artifact once, then cut anything that does not affect the decision. |
Decision cue: PNAS reformed its editorial process in 2022 by eliminating the Contributed submission track. All submissions now go through the same Direct Submission process with editorial board review. The acceptance rate is about 15%, with roughly 40% desk rejected. This checklist covers what the current editorial process evaluates, so you can identify problems before they become rejection reasons.
Check your PNAS readiness in 60 seconds with the free scan, or work through this checklist.
The 10-point PNAS pre-submission checklist
Significance and scope
1. Does the paper report work of broad scientific significance?
PNAS publishes research "of exceptional importance" across all fields of science. After the 2022 reforms, every submission competes on the same level. The paper needs to matter beyond your immediate research community. Before you submit, identify at least one scientific community outside your own that would find this result important.
2. Is the paper within PNAS scope?
PNAS covers biological sciences, physical sciences, social sciences, and engineering. The paper must fit into one of PNAS's established research categories. Pure clinical research without basic science significance may fit better elsewhere.
3. Is the significance classification correct?
PNAS asks authors to classify their submission's significance. Be honest and calibrated. Overclaiming significance in the submission metadata creates a negative first impression when the editor reads a paper that does not match the author's own assessment.
Methods and evidence
4. Are the methods fully described?
PNAS requires detailed methods (in the main text or SI Appendix). The level of detail should allow reproduction by a competent researcher in your field. Computational methods need software, parameters, and code availability. Experimental methods need reagent sources, protocols, and equipment specifications.
5. Is the statistical analysis rigorous?
Since the 2022 reforms, PNAS has increased statistical scrutiny. Sample sizes must be justified. Tests must be appropriate for the data type. Multiple comparisons must be corrected. Effect sizes and confidence intervals strengthen the paper. The methods section should describe the statistical analysis plan, not just name the tests used.
6. Is the evidence package strong enough for the claims?
PNAS reviewers expect multiple lines of evidence for significant claims. A single experiment supporting a broad conclusion will draw immediate skepticism. If the paper makes a large claim, the evidence should come from multiple independent approaches.
Data and materials
7. Are data deposited in an appropriate repository?
PNAS requires that all data, materials, and associated protocols be deposited in a publicly accessible database or be available to any researcher for purposes of reproducing or extending the research. The data availability statement must include specific repository names and accession numbers.
Code must be deposited in a recognized repository (GitHub with Zenodo DOI, Dryad, Figshare).
Compliance
8. Are ethics approvals complete?
Human subjects research: IRB approval stated in methods with institution and approval number. Animal research: IACUC approval. Clinical studies: registered in an approved registry before enrollment. PNAS will not review manuscripts without complete ethics documentation.
9. Are all author contributions and conflicts declared?
PNAS requires CRediT-style author contribution statements and complete conflict of interest declarations. Significant financial interests (consulting, equity, patents) must be disclosed.
Formatting
10. Does the manuscript follow PNAS format?
PNAS has specific formatting requirements that differ from many journals:
- abstract limited to 250 words
- significance statement required (120 words max, explaining importance to a broad audience)
- main text limited to 6 pages of printed journal format (roughly 4,500 words)
- figures and tables count toward the 6-page limit
- SI Appendix for additional methods, data, and figures (no length limit)
- references in PNAS style (numbered, with full titles)
The significance statement is uniquely important at PNAS. It is read by editors and reviewers as a quick summary of why the work matters. If the significance statement is generic or overclaimed, it undermines the paper before the science is evaluated.
The readiness shortcut
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What gets PNAS papers desk rejected
After the 2022 reforms, all PNAS submissions go through the same Direct Submission process. An Editorial Board member in one of 31 NAS disciplines evaluates each paper. Over 50% of submissions are declined at initial evaluation, typically within 7 to 14 days. The Significance Statement is the first thing the board member reads after the abstract.
The Significance Statement fails. PNAS uses this uniquely. Editors gauge whether you can articulate why your work matters to a broad audience. A generic statement ("this work provides important insights into X") signals that the authors cannot explain the broader significance. A specific statement ("this finding changes how clinicians approach Y in populations with Z, affecting treatment decisions for approximately N patients annually") demonstrates real-world impact.
The paper is outside scope or too narrow. After the Contributed track was eliminated, every paper competes on the same standard. Work that would have been accepted through a NAS member contribution now must demonstrate broad significance through the same editorial evaluation.
The methods or statistical analysis have visible gaps. PNAS has strengthened statistical scrutiny. Sample sizes must be justified. Tests must be appropriate. Effect sizes and confidence intervals are expected. Underpowered studies with marginally significant results are flagged.
The 6-page format is exceeded without justification. PNAS imposes a 6-page main text limit (roughly 4,500 words including figures and tables). The SI Appendix has no limit, but the main text must be concise. A manuscript that cannot make its case within the format constraint raises questions about whether the story is focused enough.
For more detail, see the PNAS Acceptance Rate and PNAS Under Review: Status Meanings.
How PNAS compares for pre-submission preparation
Feature | PNAS | |||
|---|---|---|---|---|
Desk rejection | ~50% | ~60% | ~40% | ~50% |
Acceptance rate | ~15% | ~8% | ~23 to 27% | ~15% |
First decision | ~30 days | ~30 days | 30 to 50 days | ~30 days |
Unique requirement | Significance statement (120 words) | Cross-disciplinary appeal | Broad accessibility | Nature reporting summary |
Main text limit | 6 pages | No strict limit | No strict limit | No strict limit |
Key editorial test | Broad scientific importance + 2022 reform standards | Cross-disciplinary significance | Would researchers outside subfield cite this? | Significant advance in field |
Related PNAS guides
Sources
On this page
Reference library
Use the core publishing datasets alongside this guide
This article answers one part of the publishing decision. The reference library covers the recurring questions that usually come next: how selective journals are, how long review takes, and what the submission requirements look like across journals.
Dataset / reference guide
Peer Review Timelines by Journal
Reference-grade journal timeline data that authors, labs, and writing centers can cite when discussing realistic review timing.
Dataset / benchmark
Biomedical Journal Acceptance Rates
A field-organized acceptance-rate guide that works as a neutral benchmark when authors are deciding how selective to target.
Reference table
Journal Submission Specs
A high-utility submission table covering word limits, figure caps, reference limits, and formatting expectations.
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