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WNT4 · Western blot design guide
Design a Western Blot for WNT4
Real validated WNT4 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-WNT4 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
WNT4 Western Blot Experimental Design Guide
Expected bands, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before running
| Expected band | ~39.1 kDa | |
| Observed band | 37-50 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Glycosylated + Cleaved | |
| Caveat | Glycosylation increases size | |
| Regulation | LPS-induced | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated WNT4 Western Blot Protocols
Literature-validated Western blot parameters for WNT4 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human MCF-7 , Lane 2: human Hela , Lane 3: human Jurkat , Lane 4: human K562 , Lane 5: rat testis , Lane 6: mouse testis . After electrophoresis, proteins were transferred to a nitrocellulose membrane at 150 mA for 50-90 minutes. Blocked the membrane with 5% non-fat milk/TBS for 1.5 hour at RT. The membrane was incubated with rabbit anti-WNT4 antigen affinity purified polyclonal antibody (A00879) at 0.5 μg/mL overnight at 4°C, then washed with TBS-0.1%Tween 3 times with 5 minutes each and probed with a goat anti-rabbit IgG-HRP secondary antibody (Catalog # BA1054) at a dilution of 1:5000 for 1.5 hour at RT. The signal is developed using an ECL Plus Western Blotting Substrate (Catalog # AR1196-200) with Tanon 5200 system. A specific band was detected for WNT4 at approximately 45-50 kDa. The expected band size for WNT4 is at 39 kDa |
| Gel % | 10–12% |
| Load | 30 ug |
| Transfer | nitrocellulose membrane, 150 mA, 50–90 min |
| Membrane | nitrocellulose |
| Blocking | 5% non-fat milk / TBS, 1.5 h RT |
| Primary antibody | 0.5 µg/mL |
| Primary incubation | overnight at 4 °C |
| Secondary antibody | goat anti-rabbit IgG-HRP, 1:5000 |
| Wash | TBS-0.1% Tween, 3 × 5 min |
| Detection | ECL |
| Exposure / imaging | Tanon 5200 |
| Observed band | 45–50 kDa |
Section 2
What Is the Expected WNT4 Western Blot Band Size?
WNT4 has a 39.1 kDa predicted backbone but runs at 37-50 kDa on Western blots, mainly due to N-glycosylation at Asn88 and Asn297.
| single band around 37-50 kDa | mature glycosylated WNT4 monomer running above its 39.1 kDa predicted mass because of N-glycosylation |
| band sitting higher than the 39.1 kDa predicted mass | added glycan mass from N-linked sites at Asn88 and Asn297 |
| diffuse or smeared band rather than one sharp line | heterogeneous glycoform occupancy across the two N-glycosylation sites |
| mature band running slightly smaller than a full-length precursor | cleavage of the 22-residue signal peptide to generate secreted mature WNT4 |
| little or no WNT4 signal in whole-cell lysate | WNT4 is secreted and extracellular matrix-associated, so it is exported rather than retained intracellularly |
| a second band at a different apparent size | co-expression of splice isoform 2 alongside isoform 1 |
💡Expected WNT4 appearanceWNT4 typically appears as a band around 37-50 kDa on reducing SDS-PAGE, reflecting the 39.1 kDa mature glycoprotein core modified by N-glycosylation at Asn88 and Asn297.
| Predicted mass (UniProt) | 39.1 kDa unmodified backbone is the baseline; the empirical band runs higher at 37-50 kDa |
| N-glycosylation at Asn88 | adds glycan mass, pushing the apparent band toward the upper end of the observed 37-50 kDa range |
| N-glycosylation at Asn297 | contributes further glycan mass and glycoform heterogeneity, broadening the band |
| Signal peptide cleavage (residues 1-22) | mature secreted WNT4 runs slightly smaller than the uncleaved full-length precursor |
| Splice isoforms 1 and 2 | isoform 2 can appear as an additional band of different apparent size relative to isoform 1 |
| Bacterial/non-glycosylated recombinant standard | runs lower and sharper, closer to the 39.1 kDa predicted mass, than native glycosylated WNT4 |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | WNT4 is secreted and extracellular matrix-associated, so little full-length protein accumulates intracellularly | probe conditioned media or ECM-enriched fractions in addition to whole-cell lysate |
| Band higher than expected | N-glycosylation at Asn88 and Asn297 adds mass above the 39.1 kDa predicted backbone | treat the sample with PNGase F to deglycosylate and check for a shift back toward predicted mass |
| Broad smear instead of sharp band | heterogeneous occupancy and processing at the two N-glycosylation sites yields a range of glycoforms | use glycosidase treatment or a longer resolving run to collapse the smear into a sharper band |
| Multiple bands | co-expression of splice isoforms 1 and 2 or partially processed glycoforms | compare band pattern against isoform sequence differences and glycosidase-treated controls |
| Weak or no signal | low steady-state cellular levels because WNT4 is rapidly secreted into the extracellular matrix | concentrate conditioned media, increase protein loading, or use a tissue known to express WNT4 as a positive control |
| Fragments below expected size | loss of the cleaved signal peptide region or proteolytic degradation during lysis | add protease inhibitors during lysis and compare against the intact mature-protein band |
Experiment evidence
Western blot images showing WNT4 band
A00879 · WNT4
A00879 · WNT4
PA2121 · WNT4
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for WNT4 Western blot
🧪For positive controls for WNT4 in Western blot, you can use conditioned medium or lysate from WNT4-overexpressing HEK293 cells, since no confirmed high-expressing tissue or cell line is available in the current HPA data.
Positive control: WNT4-transfected HEK293 cells
Negative control: no confirmed negative tissue; use siRNA knockdown or KO line
Loading controls: Run GAPDH and β-actin as loading controls for cell lysates, plus a total-protein stain (stain-free gel, Ponceau S, or REVERT), which is especially important when blotting secreted WNT4 from conditioned medium.
⚠️Feasibility: As a secreted protein, WNT4 gives weak signal in whole-cell lysate and lacks HPA expression data to confirm a reliable endogenous source, so good controls depend on concentrated conditioned medium from an overexpression system paired with siRNA/KO validation rather than a natural positive/negative tissue pair.
Comprehensive Human Protein Atlas IHC scoring per tissue. Rows are taken directly from the HPA tissue chart — click any row's HPA link to view the source.
Positive expression · recommended positive controls
| Tissue | Cell type | Level | Evidence | Source |
|---|
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|
Section 3
Advanced WNT4 Western Blot Tips
Deeper troubleshooting and optimisation questions for WNT4, answered from its protein features.
Why does WNT4 migrate above its predicted 39 kDa mass?
WNT4 carries 2 N-glycosylation sites and is annotated as a lipoprotein, both of which add mass and can broaden the band. Combined with 11 disulfide bonds affecting migration under partial reduction, the observed 37-50 kDa range is consistent with a glycosylated, lipid-modified secreted protein rather than the unmodified 39.1 kDa polypeptide backbone.
Can WNT4 isoforms cause more than one band?
UniProt lists 2 annotated isoforms of WNT4. If both are expressed in the sample, expect two closely spaced bands rather than one, since isoform-specific sequence differences shift apparent mass slightly. Confirm which isoform your antibody epitope targets before interpreting extra bands as non-specific.
Does WNT4 glycosylation affect blocking choice?
WNT4 is annotated as a glycoprotein with 2 glycosylation sites. Milk-based blockers contain glycoproteins that can cross-react with lectin-like or glycan-binding antibodies, producing background. BSA blocking is generally preferred over milk to avoid this interference when probing a glycosylated secreted target like WNT4.
Is WNT4 lipid modification relevant to detection?
UniProt notes WNT4 interacts with PORCN, the acyltransferase that lipid-modifies Wnt family ligands, consistent with its lipoprotein annotation. This modification is required for proper WNT4 secretion, so sample preparation should capture secreted or extracellular fractions rather than only intracellular pools to detect the mature form.
What transfer method to use for WNT4 Western blot?
Given WNT4's small predicted size (39.1 kDa) and 11 disulfide bonds, use standard wet transfer with a reducing sample buffer to fully denature disulfide-linked structures. Semi-dry transfer with shorter run times also works for proteins this size; confirm complete reduction to avoid disulfide-linked aggregate bands.
How should WNT4 be normalized for quantitation?
Since WNT4 is annotated as secreted and extracellular matrix-localized rather than cytoplasmic, normalize conditioned media or extracellular fractions to total protein rather than standard cytoplasmic housekeeping genes, which do not reflect secretion efficiency or loading of extracellular samples.
What explains extra WNT4 bands on blots?
With 11 disulfide bonds, incomplete reduction can leave disulfide-linked multimers running higher than 39 kDa. The 2 annotated isoforms and 2 glycosylation sites can each contribute additional distinct bands, so unexpected higher-molecular-weight bands often reflect incomplete reduction or partial glycosylation rather than nonspecific antibody binding.
Boster reagents
Best WNT4 Western Blot Antibodies
BosterBio's WNT4 antibodies are among the best-performing WB antibodies on the market — well cited, thoroughly validated, and orthogonally cross-validated against negative tissues and complementary methods.
Real WB data
Anti-WNT4 Antibody Picoband®
Cat # A00879
Real WB data
Anti-Protein Wnt-4 Wnt4 Antibody Picoband®
Cat # PA2121
For WNT4 Western blot, we recommend Boster's top-performing, extensively cited antibodies, each rigorously validated with confirmed specificity and cross-checked against negative tissue controls and complementary detection methods for reliable, reproducible results.
Which to pick: Two Boster anti-WNT4 antibodies are listed. PA2121 has documented WB validation showing a confirmed 37 kDa band in MCF-7 lysate, matching the predicted size—making it the stronger evidence-backed choice. A00879 also includes a WB image and is a reasonable alternative.
Source: BosterBio WNT4 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P56705.
- Human Protein Atlas. WNT4 tissue expression.