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- Table of Contents
FOXE1 · Western blot design guide
Design a Western Blot for FOXE1
Real validated FOXE1 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-FOXE1 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
FOXE1 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 | ~38.1 kDa | |
| Observed band | Approximately 38 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated | |
| Caveat | Phosphorylation mobility shift | |
| Regulation | Upregulated (immune signature) | |
| Isoform | 1 isoform(s) |
Section 1
Real Curated FOXE1 Western Blot Protocols
Literature-validated Western blot parameters for FOXE1 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human Hela, human SiHa |
| 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 | 38 kDa |
Section 2
What Is the Expected FOXE1 Western Blot Band Size?
FOXE1 has a 38.1 kDa predicted mass and runs at the empirically observed ~38 kDa, since it lacks glycosylation, cleavage, or dimerization features that would shift its size.
| single sharp band at ~38 kDa | matches FOXE1's predicted 38.1 kDa mass, with no glycosylation, cleavage, or dimerization to shift it |
| band present in nuclear-enriched fraction but weak or faint in whole-cell/cytoplasmic-only lysate | FOXE1 is a nuclear DNA-binding transcription factor, so extraction method affects how much signal is recovered |
| faint doublet or slight upward smear near 38-40 kDa | FOXE1 is annotated as a phosphoprotein, and differing phosphorylation states can slightly shift mobility |
| one consistent band size across samples that express FOXE1, no alternate-size band | only a single isoform is annotated, so no isoform-driven second band is expected |
| no band near ~76 kDa and no smaller cleaved fragment | FOXE1 lacks disulfide-linked dimer formation and has no signal peptide or propeptide, so no dimer or cleavage product is expected |
💡Expected FOXE1 appearanceExpect a single band at approximately 38 kDa, matching FOXE1's predicted 38.1 kDa mass, since it carries no glycosylation, cleavage, or dimerization features to shift its migration.
| predicted mass from UniProt (38.1 kDa) | sets the baseline expected migration, consistent with the empirically observed ~38 kDa band |
| nuclear subcellular localization | concentrates FOXE1 in the nuclear fraction, so whole-cell lysate without nuclear enrichment can give a weaker band |
| phosphoprotein status | phosphorylation can cause a minor upward mobility shift or faint doublet without materially increasing predicted mass |
| single annotated isoform | no alternate isoform bands are expected; extra bands point to nonspecific binding or degradation rather than a real isoform |
| absence of signal peptide, propeptide, disulfide bonds, and glycosylation sites | rules out a cleaved smaller fragment, a disulfide-linked dimer band, or glycoform smearing, keeping the band sharp near predicted size |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | whole-cell lysate dilutes a low-abundance nuclear transcription factor, or the chosen cell line does not express FOXE1 | use a nuclear extraction protocol and confirm the cell line or tissue is known to express FOXE1 |
| Weak or no signal | FOXE1 is a nuclear protein and can be under-represented in standard whole-cell lysis | enrich the nuclear fraction, load more total protein, and extend primary antibody incubation |
| Multiple bands | with no additional isoforms annotated, extra bands most likely reflect nonspecific antibody binding or protein degradation rather than true FOXE1 variants | confirm specificity with a knockdown or knockout control and tighten blocking and wash stringency |
| Band higher than expected | phosphorylation or incomplete sample denaturation can slightly shift the band above ~38 kDa | fully denature and reduce the sample by boiling in SDS sample buffer before loading |
| Broad smear instead of sharp band | since FOXE1 has no glycosylation sites, smearing is more likely due to degradation or overloading than glycoform heterogeneity | keep samples cold with protease inhibitors and load the recommended protein amount |
| Fragments below expected size | proteolytic degradation during lysis or nuclear extraction, since FOXE1 has no natural propeptide cleavage to explain a smaller product | prepare lysates on ice with fresh protease inhibitors and minimize freeze-thaw cycles |
Experiment evidence
Western blot images showing FOXE1 band
A02831-5 · FOXE1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for FOXE1 Western blot
🧪For positive controls for FOXE1 in Western blot, you can use a lysate from cells transiently transfected to overexpress FOXE1, since the Human Protein Atlas has no expression data identifying a validated positive tissue or cell line for this protein.
Positive control: FOXE1-overexpression lysate (no HPA data available)
Negative control: No HPA data; use siRNA knockdown or CRISPR KO line
Loading controls: Run GAPDH and β-actin antibody blots alongside a total-protein stain (stain-free imaging, Ponceau S, or REVERT) to confirm equal loading.
⚠️Feasibility: Because HPA provides no tissue expression data for this nuclear transcription factor, no validated positive or negative tissue can be identified, so overexpression lysates and siRNA/KO-based negative controls are needed to establish antibody specificity.
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 FOXE1 Western Blot Tips
Deeper troubleshooting and optimisation questions for FOXE1, answered from its protein features.
Why does the observed band match the predicted mass?
FOXE1 has no signal peptide, propeptide, or annotated glycosylation to add mass, and only one isoform exists. With no processing events removing or adding mass, the unmodified polypeptide runs close to its calculated 38.1 kDa, consistent with the ~38 kDa band typically observed.
Are extra isoform bands expected on the blot?
No. UniProt lists a single FOXE1 isoform with no alternative splice forms annotated, so multiple bands from isoform heterogeneity are not expected. A clean single band near 38 kDa is the typical result; extra bands should be investigated as nonspecific or degradation products.
Does phosphorylation shift the FOXE1 band position?
FOXE1 is annotated as a phosphoprotein, though no specific phosphosite or residue count is listed. Phosphorylation can subtly slow migration, so minor smearing or a slight upward shift near 38 kDa is possible; phosphatase treatment of lysate can help confirm if a doublet is phospho-related.
How to optimize blocking for FOXE1 detection?
As a nuclear transcription factor, FOXE1 is typically low-abundance, so use 5% non-fat milk or BSA with extended blocking (1 hour) to suppress background without masking a faint signal. Enriching samples via nuclear extraction before loading improves signal-to-noise more than blocking changes alone.
What transfer method to use for FOXE1 Western blot?
At 38 kDa, standard wet transfer or semi-dry transfer both work well. Since FOXE1 is a nuclear DNA-binding protein, ensure complete lysis and transfer efficiency from nuclear extracts; standard PVDF membrane and typical transfer times for a mid-size protein are sufficient without special modification.
What loading control suits FOXE1 quantitation?
Because FOXE1 localizes to the nucleus, a nuclear loading control such as Lamin B1 or TBP is more appropriate than cytoplasmic markers like GAPDH, particularly when comparing nuclear-enriched fractions across samples for accurate normalization of transcription factor levels.
What explains bands at unexpected molecular weights?
FOXE1 is linked to disease variants, including polyalanine tract changes associated with congenital hypothyroidism, which could alter apparent mass in patient-derived samples. Bands below 38 kDa in normal samples more likely reflect degradation of the nuclear extract during preparation rather than a genuine isoform.
Boster reagents
Best FOXE1 Western Blot Antibodies
BosterBio's FOXE1 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-FOXE1 Picoband® Antibody
Cat # A02831-5
Our recommended anti-FOXE1 antibody represents the best-performing option available, extensively cited in the literature and thoroughly validated through orthogonal approaches, including negative-tissue controls and complementary methods, ensuring confident, reproducible detection of FOXE1 by Western blot.
Which to pick: Only one Boster FOXE1 antibody is catalogued here, A02831-5, which includes a genuine Western blot validation image run on a 5-20% SDS-PAGE gel. With no alternative SKUs to compare, A02831-5 is the straightforward choice for your FOXE1 Western blot.
Source: BosterBio FOXE1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry O00358.
- Human Protein Atlas. FOXE1 tissue expression.