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- Table of Contents
PITX1 / Pituitary homeobox 1 · Western blot design guide
Design a Western Blot for PITX1
Source-linked PITX1 Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-PITX1 WB antibodies. Everything you need to plan the experiment before you commit precious samples.
Evidence assembled September 2026 · For research use; verify linked source records and product datasheet before use
PITX1 Western Blot Experimental Design Guide
Expected bands, source-linked protocol options, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before running
| Expected band | ~34.1 kDa | |
| Gel | 12–15% (standard starting point) | |
| Positive control | Esophagus (IHC candidate; verify WB) +4 more | |
| Negative control | Adipose tissue (IHC candidate; verify WB) |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated + Acetylated | |
| Caveat | Phosphorylation-state controls | |
| Gene-set association | MSigDB C7 membership | |
| Isoform | 1 isoform(s) |
Section 1
Source-Linked PITX1 Western Blot Protocol Options
The A02993 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | Target-positive lysate and matched negative control (standard starting point) |
| Gel % | 12–15% (standard starting point) |
| Load | 20–30 µg total protein per lane; optimize for abundance (standard starting point) |
| Transfer | Standard semi-dry transfer; verify efficiency (standard starting point) |
| Membrane | 0.45 µm PVDF (standard starting point) |
| Blocking | 5% milk or 5% BSA in TBST (standard starting point) |
| Primary antibody | A02993; use the WB datasheet starting dilution (standard starting point) |
| Primary incubation | Overnight at 4 °C (standard starting point) |
| Secondary antibody | Species-matched HRP conjugate at validated dilution (standard starting point) |
| Secondary incubation | 1 h at room temperature (standard starting point) |
| Wash | 3 × 5 min in TBST (standard starting point) |
| Detection | ECL; bracket exposures to avoid saturation (standard starting point) |
Section 2
What Is the Expected PITX1 Western Blot Band Size?
PITX1 is predicted at 34.1 kDa; its recorded acetylation and phosphorylation could affect migration, but no empirical band or visible shift is established.
| Band near 34.1 kDa | Consistent with the predicted size of PITX1; confirm identity with controls |
| Band enriched in nuclear fraction | Consistent with PITX1 nuclear localization |
| Weak band in cytoplasmic fraction | Consistent with PITX1 nuclear localization |
| Doublet near 34.1 kDa | Could reflect phosphorylation at Ser46 or Ser48 if confirmed; distinct migration is not established |
💡Expected PITX1 appearancePITX1 has a predicted mass of 34.1 kDa, but no empirical band size is supplied; assess a band near that size with band-identity controls because its recorded modifications do not establish a migration shift.
| Predicted PITX1 mass | Sets a 34.1 kDa reference, not a measured band position |
| N-acetylmethionine at residue 1 | Adds a small modification without an established visible shift |
| Phosphoserine at residue 46 | May alter migration, but no band shift is documented |
| Phosphoserine at residue 48 | May alter migration, but no band shift is documented |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | Nuclear PITX1 may be poorly recovered or diluted in the lysate | Check nuclear extraction and a nuclear fraction control |
| Band higher than expected | Its identity and any phosphorylation-related shift are unconfirmed | Compare with a molecular weight marker and use peptide competition or PITX1 depletion |
| Band lower than expected | Its identity is unconfirmed; no cleavage feature is listed | Check sample integrity and confirm the band with PITX1 depletion |
| Multiple bands | PITX1 phosphorylation is recorded, but distinct migrating forms are unproven | Test phosphatase sensitivity and confirm bands with PITX1 depletion |
| Weak or no signal | Nuclear PITX1 may be underrepresented in the sample | Check sample loading and enrich the nuclear fraction |
Experiment evidence
Western blot images showing PITX1 band
A02993 · PITX1
A02993 · PITX1
A02993 · PITX1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for PITX1 Western blot
🧪HPA-IHC candidate guidance (verify in WB): For positive controls for PITX1 in Western blot, you can use esophagus tissue, the strongest HPA positive candidate.
Positive control: Esophagus (IHC candidate; verify WB)
Negative control: Adipose tissue (IHC candidate; verify WB)
Loading controls: Run GAPDH, β-actin, and a total-protein stain such as Ponceau alongside the samples.
⚠️Feasibility: PITX1 is nuclear, so a nuclear-enriched lysate may improve detection.
HPA tissue expression evidence for PITX1
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.
Higher expression tissues · candidate positive controls from IHC
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Esophagus | squamous epithelial cells | High | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Medium | Protein (IHC) | HPA → |
| Breast | glandular cells | Medium | Protein (IHC) | HPA → |
| Cervix | squamous epithelial cells | Medium | Protein (IHC) | HPA → |
| Lymph node | germinal center cells | Medium | Protein (IHC) | HPA → |
Lower expression tissues · IHC evidence, not confirmed WB-negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | glandular cells | Not detected | Protein (IHC) | HPA → |
| Caudate | glial cells | Not detected | Protein (IHC) | HPA → |
| Cerebellum | cells in granular layer | Not detected | Protein (IHC) | HPA → |
| Epididymis | glandular cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced PITX1 Western Blot Tips
Deeper troubleshooting and optimisation questions for PITX1, answered from its protein features.
Where should the PITX1 band appear?
Band shift · PITX1 has a predicted mass of 34.1 kDa. No observed band position is supplied, so use 34.1 kDa as a reference rather than an established apparent mass.
Could PITX1 isoforms explain multiple bands?
Isoforms · The supplied UniProt record lists one isoform and no alternative sequence. These features do not support assigning additional bands to PITX1 isoforms; confirm their identity before interpreting them.
Which PITX1 modifications are listed?
PTM · UniProt lists N-acetylmethionine at position 1 and phosphoserines at positions 46 and 48. These are UniProt coordinates; paper or antibody numbering may differ.
Ser46 and Ser48 are listed as phosphorylated, but their presence alone does not establish a visible shift or explain any difference from 34.1 kDa. Verify the identity and phosphorylation state of a shifted band before assigning it to these sites.
Ser46 and Ser48 are listed as phosphorylated, but their presence alone does not establish a visible shift or explain any difference from 34.1 kDa. Verify the identity and phosphorylation state of a shifted band before assigning it to these sites.
Does this guide establish induction of PITX1?
Induction · No general induction response is established by this guide. A pathway or gene-set association is not evidence of induction in a particular specimen. Verify the relevant treatment and control in a target-specific experiment.
How should transfer be checked for PITX1?
Transfer · Standard workflow guidance: verify transfer efficiency for the intended target size before interpreting a weak signal. Use total-protein assessment and optimize transfer for the membrane, gel and apparatus; the labelled catalog values take precedence.
How should blocking be optimized?
Blocking · Standard workflow guidance: follow the A02993 datasheet where specified. Otherwise compare 5% milk or 5% BSA in TBST; for a phospho-specific assay start with BSA. Optimize background and specific signal with matched controls.
What matters when quantifying total PITX1?
Quantitation · Consider antibody recognition of PITX1 phosphorylated at UniProt Ser46 or Ser48. If the epitope overlaps those sites, check whether phosphorylation changes detection before treating band intensity as total PITX1 abundance.
How should unexpected PITX1 bands be interpreted?
Interpretation · Start with the 34.1 kDa predicted mass, the single listed isoform, and the modifications at UniProt positions 1, 46, and 48. None establishes the identity of an unexpected band. Confirm that the band contains PITX1 before attributing it to an isoform or modification.
Boster reagents
PITX1 Western Blot Antibodies
Catalog antibodies with Western blot application and product-specific WB images. Evaluate suitability with the reported sample, controls and experimental conditions.
Real WB data
Anti-Pituitary homeobox 1 Pitx1 Antibody
Cat # A02993
The catalog reports A02993, an anti-PITX1 polyclonal antibody with stated human, mouse, and rat reactivity. Its Western blot image shows Jurkat cells; no publication evidence or other sample validation is supplied.
Which to pick: A02993 is the only listed option and has a Western blot image using Jurkat cells. For mouse or rat samples, the stated reactivity is listed, but no corresponding Western blot example is provided.
Source: BosterBio PITX1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P78337.
- Human Protein Atlas. PITX1 tissue expression.
- PMC13126404 — target-verified WB comparison
- PMC12004679 — target-verified WB comparison