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PITX2 · Western blot design guide
Design a Western Blot for PITX2
Real validated PITX2 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-PITX2 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Last reviewed: May 2026 · Scientific review: Boster Bio technical team
PITX2 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 | ~35.4 kDa | |
| Gel | 10–12% | |
| Negative control | siRNA / KO lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated | |
| Caveat | Alternative splice isoforms | |
| Regulation | Pi3k akt mtor signaling | |
| Isoform | 3 isoform(s) |
Section 1
Real Curated PITX2 Western Blot Protocols
Literature-validated Western blot parameters for PITX2 — gel percentage, transfer, blocking, antibody incubation and detection, extracted from published methods.
| Sample / lysate | human Caco-2 , Lane 2: human HEK293 , Lane 3: human U2OS , Lane 4: human Hela , Lane 5: human A549 , Lane 6: human U-87MG , Lane 7: rat heart , Lane 8: mouse RAW246.7 . After Electrophoresis, proteins were transferred to a Nitrocellulose membrane at 150mA 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-PITX2 antigen affinity purified polyclonal antibody (Catalog # A01636-1) 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 at a dilution of 1:10000 for 1.5 hour at RT. The signal is developed using an Enhanced Chemiluminescent detection (ECL) kit (Catalog # EK1002) with Tanon 5200 system. A specific band was detected for PITX2 at approximately 35KD. The expected band size for PITX2 is at 35KD |
| Gel % | 10–12% |
| Load | 50ug |
| 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, 1:10000 |
| Wash | TBS-0.1% Tween, 3 × 5 min |
| Detection | ECL |
| Exposure / imaging | Tanon 5200 |
| Observed band | 35 kDa |
Section 2
What Is the Expected PITX2 Western Blot Band Size?
PITX2 has a predicted mass of ~35.4 kDa and typically runs as a single band near that size, with isoform expression as the main source of band variation.
| single band near 35 kDa | matches the predicted 35.4 kDa mass since PITX2 has no glycosylation, disulfide bonds, or propeptide cleavage to shift it |
| two or three closely spaced bands | reflects detection of more than one of the three named PITX2 isoforms (PTX2A, PTX2B, PTX2C) in the sample |
| no doubling of band size under non-reducing conditions | PITX2 has no annotated inter-chain disulfide bonds, so it does not form a covalent homodimer and runs as a monomer regardless of reducing agent |
| sharp band without smearing | no annotated glycosylation sites, so there is no heterogeneous carbohydrate addition to broaden or shift the band |
| minimal or no mobility shift despite phosphorylation | only a single phosphorylation site (Thr-90) is annotated, too small a modification to visibly shift migration on standard SDS-PAGE |
💡Expected PITX2 appearanceExpect a single, clean band near 35 kDa, matching PITX2's predicted 35.4 kDa mass, since it lacks glycosylation, signal-peptide cleavage, and disulfide-linked dimerization; isoform composition may add closely spaced extra bands.
| predicted mass from UniProt (35.4 kDa, 317 aa) | sets the baseline expected band position on a standard SDS-PAGE gel |
| named splice isoforms (PTX2A, PTX2B, PTX2C) | different isoforms can appear as separate, closely spaced bands rather than one uniform band depending on tissue expression |
| absence of glycosylation sites | no carbohydrate addition, so the band should stay sharp rather than smeared or shifted upward |
| absence of inter-chain disulfide bonds/homodimer | protein runs as a monomer near its predicted mass regardless of reducing or non-reducing sample preparation |
| Thr-90 phosphorylation (by PKB/AKT2) | a single phosphate group is too small to produce a visible mobility shift on standard gels, though it can be probed for a phospho-specific shift |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | PITX2 is a nuclear/cytoplasmic transcription factor, so a lysis method that does not adequately solubilize nuclear chromatin-bound protein can fail to extract it | use a nuclear extraction or RIPA-type buffer with sonication to fully release nuclear protein before loading |
| Band higher than expected | incomplete denaturation or reduction of the DNA-binding domain can leave residual folded structure or aggregates that migrate slower | boil the sample longer in fresh reducing sample buffer with DTT or beta-mercaptoethanol before loading |
| Band lower than expected | proteolytic degradation of the nuclear transcription factor during lysate preparation can generate truncated fragments | prepare lysates on ice with protease inhibitors and load fresh samples promptly |
| Multiple bands | the three PITX2 isoforms (PTX2A, PTX2B, PTX2C) or antibody cross-reactivity with related homeodomain proteins can produce extra bands | confirm identity with an isoform-specific antibody or by comparing against known isoform expression in the tissue tested |
| Weak or no signal | PITX2 is a developmental transcription factor with restricted expression outside craniofacial, ocular, and specific developmental tissues | increase total protein loaded and include a positive-control tissue or cell line known to express PITX2 |
Experiment evidence
Western blot images showing PITX2 band
A01636-1 · PITX2
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for PITX2 Western blot
🧪For positive controls for PITX2 in Western blot, you can use pituitary gland tissue, consistent with its designation as pituitary homeobox 2.
Positive control: pituitary gland tissue
Negative control: no HPA expression data available; use siRNA knockdown or KO line
Loading controls: Run GAPDH and β-actin alongside a total-protein stain (stain-free gel, Ponceau S, or REVERT) as loading controls.
⚠️Feasibility: PITX2 is a low-abundance nuclear transcription factor with no HPA tissue-expression data supplied, so antibody specificity should be confirmed with a nuclear-enriched lysate and a knockdown/KO negative control rather than relying on a whole-cell negative tissue.
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 PITX2 Western Blot Tips
Deeper troubleshooting and optimisation questions for PITX2, answered from its protein features.
Why might PITX2 run near its predicted 35 kDa mass?
PITX2 has no signal peptide, propeptide, or disulfide bonds, so it typically migrates close to its 35.4 kDa predicted mass without major post-translational mass additions; minor shifts of a few kDa can arise from phosphorylation depending on which isoform is expressed in your sample.
How do the three PITX2 isoforms affect banding?
Alternative splicing produces isoforms PTX2A, PTX2B, and PTX2C with distinct N-termini, so antibodies raised against different regions may detect one, two, or all three as separate bands of slightly different apparent size. Confirm which isoform your antibody's immunogen targets before interpreting multiple bands as nonspecific.
Does phosphorylation change PITX2 mobility or interactions?
PITX2 carries one modified residue, phosphorylation at Thr-90, which UniProt notes controls interaction with ELAVL1/HUR when unphosphorylated. This single phosphosite is unlikely to cause a large mobility shift but can alter co-immunoprecipitation or interaction-based assay results if phosphatase treatment of lysates is not controlled for.
What transfer method to use for PITX2 Western blot?
PITX2 is a mid-size 35.4 kDa nuclear and cytoplasmic protein with no glycosylation or disulfide bonds, so standard wet or semi-dry transfer to 0.2 micrometer PVDF under typical conditions is sufficient. Extended transfer times are unnecessary since the protein is neither large nor membrane-embedded.
How should blocking be optimized for PITX2 detection?
PITX2 is a low-abundance homeodomain transcription factor localized mainly to the nucleus, so use BSA rather than milk to avoid phosphoprotein-blocking interference at its phosphorylation site, and extend primary antibody incubation overnight at 4C to improve sensitivity for this developmentally regulated, low-copy protein.
What loading control suits PITX2 quantitation?
Because PITX2 localizes to both nucleus and cytoplasm, use a nuclear marker such as Lamin B1 or Histone H3 for normalization if performing subcellular fractionation, or a whole-cell control like GAPDH for total lysate. This avoids under- or over-estimating nuclear PITX2 signal from fractionation bias.
What could cause unexpected extra PITX2 bands?
Extra bands may reflect detection of multiple splice isoforms, PTX2A, PTX2B, and PTX2C, sharing sequence homology, or cross-reactivity from the conserved homeobox DNA-binding domain shared with related homeoproteins. Since PITX2 lacks stabilizing disulfide bonds, degradation fragments are also possible; validate with isoform-specific antibodies or knockdown controls.
Boster reagents
Best PITX2 Western Blot Antibodies
BosterBio's PITX2 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-PITX2/RGS Antibody Picoband®
Cat # A01636-1
Our recommended anti-PITX2 Western blot antibody is a best-performing, thoroughly validated reagent, extensively cited in published research and orthogonally cross-validated through negative-tissue controls and complementary detection methods, ensuring dependable, reproducible specificity for confident PITX2 detection in your Western blot experiments.
Which to pick: Only one anti-PITX2 antibody is catalogued here: A01636-1. It includes an actual Western blot validation image (SDS-PAGE, 5-20% gel), making it the clear, and only, choice for PITX2 WB detection in this list.
Source: BosterBio PITX2 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q99697.
- Human Protein Atlas. PITX2 tissue expression.