PNAS Pre-Submission Checklist: What to Verify Before Upload

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.

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).

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.

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.

PNAS is the only top-tier journal that requires a formal Significance Statement with every submission. This 120-word statement is the first thing the Editorial Board member reads after the abstract. It must explain the work's importance to a non-specialist NAS audience. Generic statements fail. The best Significance Statements name a specific real-world consequence or name the assumption the paper overturns.

Check your PNAS readiness automatically. The Manusights free scan evaluates your manuscript against PNAS standards and returns a readiness score, desk-reject risk signal, and top issues in about 1-2 minutes.

For a full assessment, the PNAS submission readiness check provides 15+ verified citations from 500M+ live papers, figure-level feedback, and a prioritized revision checklist calibrated to PNAS. Every citation is verified against CrossRef and PubMed.

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.

• PNAS Under Review: Status Meanings
• PNAS Acceptance Rate
• PNAS impact factor
• PNAS vs Nature Communications
• PNAS vs Science Advances

In our pre-submission review work, PNAS submissions rarely fail because the authors forgot an ordinary formatting detail. They fail because the Significance Statement, abstract, and figure set do not agree on why the paper matters to a broad scientific audience.

That is the practical effect of the post-2022 PNAS model. There is no protected route for a paper that is interesting only to one narrow specialty. If the broader consequence is still vague, or if the manuscript only looks persuasive after a long explanation from the authors, the checklist has not really been satisfied yet.

PNAS sits in a specific tier: IF 9.1 (JCR 2024), JCI 2.30, Q1, ranked 14th out of 135 multidisciplinary science journals. It's not Nature or Science, and it's not a specialist journal. It's the place for work that's genuinely broad but doesn't need to rewrite an entire field.

Submit to PNAS if:

• Your paper has a clear Significance Statement that names a specific consequence or overturned assumption, not a vague "sheds light on" claim
• The work matters to at least two scientific communities outside your own subfield
• You can tell the full story within the 6-page main text limit (roughly 4,500 words)
• You're comfortable with the two-track outcome: ~50% desk rejection within 7--14 days, or full review with ~15% overall acceptance
• You're comfortable with the two-track outcome: ~50% desk rejection within 7 to 14 days, or full review with ~15% overall acceptance

Consider a different journal if:

• The paper's impact is primarily within one narrow subfield, a discipline-specific journal will serve it better
• You can't write a 120-word Significance Statement that sounds genuinely compelling to a non-specialist
• The work is a clinical study without basic science significance (PNAS isn't the right venue)
• You'd rather avoid the high desk-rejection rate and want a faster path to peer review

PNAS's Significance Statement requirement is unique among top-tier journals, and it's where most desk rejections start. If you can't articulate why a scientist in a different field should care, that's your answer.

Last verified: PNAS Author Center and JCR 2024 (IF 9.1, Q1, rank 14/135 multidisciplinary sciences).