Intermolecular 3'UTR-3'UTR interactions drive Wnt gene activation through heteromeric protein assembly

Name: Verified Rigor Record — Intermolecular 3'UTR-3'UTR interactions drive Wnt gene activation through heteromeric protein assembly
Item: Intermolecular 3'UTR-3'UTR interactions drive Wnt gene activation through heteromeric protein assembly
Rating: 79
Author: Αlpha¹

Cai, T.; Cruz, N. M.; Basu, S.; White, R. M.; Mayr, C.

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Αlpha¹ Rigor Review

Rigor Review Verified

Critical

High-priority

Action items to resolve · Critical / High

Confidence: highEngine: 7.6.0Source: full text

Not verified in this report

References were not verified against Crossref/OpenAlex.
No reported statistical tests were found to recompute.
Declared data/code links were not checked for liveness or content.

This Alpha1 Rigor Review uses AI Rigor Reviewers trained on a curated corpus of high-fidelity and retracted papers, with expert supervision and curation. It can still make mistakes; verify each finding against the source before relying on it.

This is a well-designed, transparently reported preclinical study with strong data and code availability. Its main methodological weaknesses are incomplete reporting of design rigor elements (blinding, power analysis, inclusion/exclusion criteria, outlier handling) and missing animal ethics approval for the zebrafish experiments. Several conclusions are slightly overstated relative to the evidence, and a small number of copyedit issues (typos, inconsistent spacing) are present.

Three independent reviewers scored all eight dimensions of the full-text manuscript. A copyedit pass flagged 12 minor issues. A statistics component found no recomputable tests. A claim audit identified one overstated conclusion. No citation or integrity issues were flagged. The evaluations converged well on all dimensions; the sole divergence (biological variables: two 'warn' vs one 'fail') was resolved by weighing the specific evidence.

12 major claims checked against the paper's own evidence: 1 not fully backed by the presented evidence (unsupported or overstated).

overstatedDiscussion, paragraph 1Reviewer 2
Co-folded transcription regulator complexes have higher activity than their corresponding protein-protein interactions formed post-translationally.
The data show that disrupting 3'UTR interactions (and thus co-translational assembly) reduces gene induction by ~50%, but the claim that co-folded complexes have 'higher activity' is an interpretation not directly tested; the observed reduction could also reflect different efficiency of the two pathways rather than an intrinsic activity difference.
Evidence: PLA and co-IP show reduced β-catenin/TCF7L2 interaction in Udel cells; gene induction is reduced about two-fold. No direct comparison of the specific activity of co-folded vs post-translationally formed complexes is performed.
“co-folded transcription regulator complexes have higher activity than their corresponding protein-protein interactions formed post-translationally”
partialDiscussion, first paragraph and modelReviewer 1
Co-folded transcription regulator complexes have higher transcriptional activity than their corresponding protein-protein interactions formed post-translationally.
The claim is supported by the two-fold reduction in Wnt target gene induction in Udel cells and the PLA data, but direct measurement of co-folded complex activity vs. post-translational complex activity is not possible with current technology, as the authors acknowledge. The claim is inferential based on the differential outcomes.
Evidence: Figure 4-7 and Discussion: 'the two distinct protein states (co-folded complex versus protein-protein interaction) cannot be distinguished ... through 3′UTR disruption, which only affects formation of co-folded complexes, the distinct transcriptional outcomes ... revealed that co-folded transcription regulator complexes have a higher transcriptional activity'.
“co-folded transcription regulator complexes have higher activity than their corresponding protein-protein interactions formed post-translationally.”
partialResults, paragraph 2Reviewer 2
Most tested 3'UTRs modulate stem cell differentiation efficiency in a protein abundance-independent manner.
Six out of seven tested deletions showed no significant change in protein abundance, but the seventh (GATA6) increased protein levels, and three deletions had no significant effect; the evidence for abundance-independence is indirect for some.
Evidence: 7/10 deletions affected differentiation; 6/7 deletions showed no significant protein abundance change by western blot or flow cytometry.
“we did not observe significant differences in 6/7 cases”
partialDiscussion, 'Intermolecular 3′UTR-3′UTR interactions turn biogenesis...'Reviewer 3
Co-folded transcription regulator complexes have higher transcriptional activity than post-translationally formed complexes.
The paper shows that disruption of 3'UTR interaction reduces Wnt target gene induction, which is consistent with higher activity of the co-translationally assembled complexes. However, direct demonstration of higher activity (e.g., reporter assays) is lacking, and the comparison is inferential.
Evidence: PLA and gene expression data showing 50% reduction in co-localization and gene induction upon 3'UTR deletion.
“These findings indicate that co-folded transcription regulator complexes have higher activity than their corresponding protein-protein interactions formed post-translationally.”
supportedAbstract and Results, first paragraph of resultsReviewers 1, 3
Partial deletion of endogenous 3'UTRs altered stem cell differentiation efficiency in 7/10 cases.
The claim is directly supported by Figure 1 data showing significant fold changes in SOX17+CXCR4+ cells for 7 out of 10 genes.
Evidence: Figure 1D-F and text: 'revealed a significant difference in SOX17+CXCR4+ cells in seven out of ten investigated genes, shown as fold change (FC) between Ctrl and Udel clones'.
“Partial deletion of endogenous 3′UTRs altered stem cell differentiation efficiency in 7/10 cases.”
supportedAbstract and Results, paragraph 'Most tested 3′UTRs change...'Reviewer 1
6/7 3′UTR deletions did not affect expression level of the encoded proteins, revealing widespread abundance-independent regulatory roles of 3′UTRs.
The claim is supported by protein expression data (western blot, flow cytometry) showing no significant difference in 6/7 cases, as presented in Figure 1G-H and supplementary figures.
Evidence: Figure 1G-H and text: 'when comparing protein expression levels in Ctrl and 3′UTR deletion clones, measured by western blot or flow cytometry, we did not observe significant differences in 6/7 cases'.
“As 6/7 3′UTR deletions did not affect expression level of the encoded proteins, we reveal widespread abundance-independent regulatory roles of 3′UTRs.”
supportedAbstract and Results, sections 'The CTNNB1 3′UTR is necessary for co-translational protein complex assembly' and 'Direct RNA-RNA interaction'Reviewer 1
Long intermolecular 3′UTR-3′UTR interactions between Wnt transcription factor mRNAs and CTNNB1 enable co-translational protein complex assembly of these transcription factors with β-catenin.
The claim is supported by multiple lines of evidence: RIP with cycloheximide/puromycin (Figure 6), psoralen crosslinking (Figure 7), and ASO blocking of predicted interactions (Figure 6-7).
Evidence: Figures 6A-D, 7A-F and text: 'RIP in the presence of cycloheximide... β-catenin RIP pulls down CTNNB1 and TCF7L2 mRNAs. Their pull down is strongly reduced upon puromycin treatment'.
“We show that long intermolecular 3′UTR-3′UTR interactions between Wnt transcription factor mRNAs and CTNNB1 enable co-translational protein complex assembly of these transcription factors with β-catenin.”
supportedAbstract and Results, section 'Disruption of the two intermolecular 3′UTR-3′UTR interactions through ASOs is sufficient to impair Wnt gene induction'Reviewer 1
Antisense oligonucleotide-mediated blocking of 3′UTR interactions impairs Wnt program induction, indicating that transcriptional regulators form functional units during protein biogenesis to be fully active.
The claim is supported by ASO tiling experiments (Figure 7G-H) showing that blocking CTNNB1-TCF7L1/TCF7L2 3'UTR interactions reduces Wnt target gene expression (LEF1, AXIN2, TBXT) without affecting β-catenin protein levels.
Evidence: Figure 7G-H and text: 'ASOs 12–14 ... reduced β-catenin/TCF7L2 protein PLA puncta by 50% ... ASO-mediated blocking of the 3′UTR-3′UTR interactions is sufficient to impair Wnt target gene induction during iPSC differentiation'.
“As antisense oligonucleotide-mediated blocking of 3′UTR interactions impairs Wnt program induction, our findings indicate that transcriptional regulators can form functional units during protein biogenesis to be fully active.”
supportedResults, section 'Ctnnb1 3′UTR deletion causes embryonic abnormalities in zebrafish'Reviewer 1
Deletion of the CTNNB1 3'UTR impairs zebrafish embryogenesis despite normal β-catenin protein levels.
The claim is supported by zebrafish data showing developmental abnormalities in ctnnb1 3'UTR deletion embryos (25% mild, 20% severe) with β-catenin levels similar to controls, and reduced lef1/axin2 expression.
Evidence: Figure 3 and text: 'In the 3′UTR deletion group, 25% of embryos showed mild deformations, whereas 20% had severe abnormalities, despite mosaic editing ... β-catenin protein expression was similar between ctnnb1 Udel and Ctrl embryos'.
“CTNNB1 3′UTR deletion of CTNNB1 ... impairs zebrafish embryogenesis and induction of the Wnt transcriptional program during human stem cell differentiation.”
supportedAbstract and Results, sections 'CTNNB1 3′UTR deletion impairs Wnt target gene expression'Reviewer 1
3'UTR deletion of CTNNB1 keeps β-catenin levels unaffected but impairs Wnt transcriptional program induction.
This is well supported by western blot, flow cytometry, and fractionation data showing no difference in total β-catenin, active β-catenin, or nuclear β-catenin between Ctrl and Udel cells, while RNA-seq and qRT-PCR show reduced Wnt target genes.
Evidence: Figures 2-4: 'β-catenin protein abundance between Ctrl and CTNNB1 Udel cells ... did not observe a difference at any of the four timepoints ... Wnt target genes LEF1 and AXIN2 ... induction was strongly impaired'.
“3′UTR deletion of CTNNB1 ... keeps β-catenin levels unaffected but impairs zebrafish embryogenesis and induction of the Wnt transcriptional program during human stem cell differentiation.”
supportedTitle, Abstract, Results throughoutReviewer 2
Intermolecular 3'UTR-3'UTR interactions drive Wnt gene activation through heteromeric protein assembly.
Multiple lines of evidence from deletion, ASO, PLA, RIP, ChIP, and zebrafish experiments directly support this claim.
Evidence: CTNNB1 3'UTR deletion reduces Wnt target gene induction; ASO blocking of interaction sites impairs gene activation; PLA shows reduced co-localization; RIP demonstrates co-translational interaction; zebrafish ctnnb1 Udel phenocopies Wnt defects.
“Intermolecular 3′UTR-3′UTR interactions drive Wnt gene activation through heteromeric protein assembly”
supportedResults, CTNNB1 3'UTR deletion impairs Wnt target gene expression; CTNNB1 3'UTR deletion causes embryonic abnormalities in zebrafishReviewer 2
CTNNB1 3'UTR is required for full induction of the Wnt transcriptional program.
RNA-seq, qPCR, and zebrafish data consistently show reduced Wnt target gene expression upon CTNNB1 3'UTR deletion.
Evidence: RNA-seq at DE24h shows reduced canonical Wnt targets; LEF1/AXIN2 induction impaired in Udel cells and zebrafish.
“CTNNB1 3′UTR deletion reduced induction of Wnt target genes, such as LEF1 and AXIN2 during DE differentiation in a β-catenin protein abundance- and protein localization-independent manner.”

Rigor

Eight Dimensions4 pass · 3 warn · 1 fail

12 major claims1 overstated3 partial8 supported

12 copyedit issues flagged: mostly typo, consistency, clarity.

Alpha¹ Rigor Action ItemsFinal pass before journal submission

As this paper is already published, the assessment is a post-publication robustness evaluation. An informed reader should note the missing IACUC statement for zebrafish experiments and the absence of blinding and power analysis reporting as limitations that reduce confidence in the reproducibility of the cell-based phenotypic assays. The one overstated claim (co-folded complexes have 'higher activity') is a minor over-interpretation that warrants a correction or tempering in any future revised version. The copyedit errors are trivial. The core data and code are openly available, which is a significant strength.

1.
HIGHethics
Add an IACUC or animal welfare ethics approval statement with protocol number for the zebrafish experiments in STAR Methods, 'Zebrafish experiments'.
Zebrafish are vertebrate animals; absence of an IACUC statement is a significant reporting gap that readers and journals will flag and could warrant an erratum.
2.
HIGHreporting
Temper the claim that co-folded complexes have 'higher activity' than post-translational interactions; state instead that disrupting co-translational assembly reduces gene induction by ~50%, which is consistent with a difference in efficiency or requirement.
The claim audit identified this conclusion as overstated because the data do not directly test intrinsic activity, only the effect of disrupting one assembly route.
3.
HIGHrigor
Report the sex of the human pluripotent stem cell lines (e.g., HUES8 is male, 731.2B may be known) in STAR Methods, 'Cell lines'.
Sex is a basic biological variable; its omission limits assessment of sex-specific effects and is a common reviewer concern.
4.
HIGHrigor
Specify the zebrafish strain (e.g., AB, Tübingen) and source (e.g., vendor or laboratory) in STAR Methods, 'Zebrafish experiments'.
Strain identity is critical for reproducibility of zebrafish experiments, which is currently missing.
5.
HIGHrigor
Provide a statement on investigator blinding for differentiation assays and flow cytometry analyses in STAR Methods or figure legends.
Blinding reduces assessment bias; its absence is a standard rigor requirement for preclinical studies.
6.
HIGHstatistics
Report exact p-values (e.g., 'P = 0.023') instead of threshold asterisks for all primary comparisons in figures and text.
Threshold-only p-values are less informative and do not allow readers to assess evidence strength precisely.
7.
HIGHstatistics
Include effect sizes with 95% confidence intervals for key comparisons (e.g., fold change in differentiation efficiency, PLA puncta counts) alongside p-values.
Effect sizes and CIs convey the magnitude and precision of effects, which is more informative than p-values alone.
8.
MEDIUMreporting
Explicitly define biological vs. technical replicates in figure legends or STAR Methods, and confirm that 'n' refers to independent biological experiments.
Without this distinction, readers cannot assess the independence of the data points shown in figures.
9.
MEDIUMrigor
Pre-specify inclusion/exclusion criteria for clone selection and differentiation experiments (e.g., viability thresholds, passage number limits) in STAR Methods.
Pre-specified criteria reduce selective reporting and improve transparency of the experimental pipeline.
10.
MEDIUMrigor
Describe the method for handling outliers in flow cytometry or other quantitative assays (e.g., exclusion rules for technical replicates) in STAR Methods.
Outlier handling is a standard reporting element; its absence leaves room for post-hoc exclusion that could bias results.
11.
MEDIUMcopyedit
Correct the typo 'progrom' to 'program' in the Introduction, last paragraph (and any duplicate occurrences).
This is a clear typographical error that should be fixed in any revision.
12.
MEDIUMcopyedit
Remove extra spaces: 'C tnnb1' → 'ctnnb1' (Abstract and Results, zebrafish section); 'heart edemas .' → 'heart edemas.'; spaces before commas in gene lists.
Inconsistent spacing is a minor but pervasive formatting issue that detracts from manuscript polish.
13.
LOWreporting
Consider citing a reporting guideline such as ARRIVE for the zebrafish experiments in STAR Methods.
While not required, citing ARRIVE demonstrates adherence to best practices for animal research and may be expected by the journal.
14.
LOWrigor
Include RRIDs for antibodies and cell lines in STAR Methods to facilitate resource identification.
RRIDs are a standard community resource for unambiguous identification that improves reproducibility.

Full text (83,293 chars)Analyzed: Jul 6, 2026

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