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- Table of Contents
SPI1 · Western blot design guide
SPI1 Western Blot Planning Guide
Plan a SPI1 Western blot around the catalog-observed 31.1 kDa band, image-backed A01116-1 evidence, HPA controls, and verified protocol records.
Evidence assembled July 2026 · For research use; verify linked source records and product datasheet before use
SPI1 Western Blot Experimental Design Guide
Expected bands, documented protocol parameters, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before running
| Expected band | 31.1 kDa | |
| Observed band | Not reported — verify product WB image | |
| Gel | 12-15% | |
| Positive control | Spleen | |
| Negative control | Appendix |
Important caveats
Reasons your observed band may differ from the expected size.
| ⓘ | Calculated mass | 31.1 kDa |
| ⓘ | Localization | Nucleus |
| ⓘ | Processing / PTM | Record-dependent |
| ⓘ | Reactivity | Human / Mouse / Rat |
Section 1
Real Curated SPI1 Western Blot Protocols
Start with the molecular-weight rule, then compare verified publication-derived conditions.
| Sample / lysate | Bone marrow |
| Gel % | 12-15% |
| Load | 20-30 µg total protein per lane |
| Transfer | Semi-dry, standard transfer |
| Membrane | 0.45 µm PVDF |
| Blocking | 5% non-fat milk or 5% BSA in TBST |
| Primary | A01116-1 at datasheet starting dilution |
| Primary incubation | Overnight at 4 °C with gentle agitation |
| Secondary | Species-matched HRP conjugate at validated dilution |
| Wash | 3 × 5 min in TBST |
| Detection | Chemiluminescent substrate |
| Exposure | Bracket exposures to avoid saturation |
Section 2
What Is the Expected SPI1 Western Blot Band Size?
Use the product-observed 31.1 kDa band as the primary planning value and retain the UniProt calculated mass as context.
| 31.1 kDa | Matches the authoritative product WB observation. |
| 31.1 kDa calculated | Use as UniProt context, not as a replacement observed band. |
| Unexpected additional signal | Do not assign identity without orthogonal positive/negative controls. |
💡Expected SPI1 appearancePlan around 31.1 kDa and keep the calculated mass as supporting context.
| Catalog-observed band | 31.1 kDa; use this as the primary experimental expectation. |
| Calculated mass | 31.1 kDa from UniProt P17947; retain as context. |
| Gel selection | 12-15%; shared with the recommended protocol and poster. |
| Specificity check | Compare the lead HPA positive and negative controls with A01116-1. |
| Situation | Likely cause | Next action |
|---|---|---|
| 31.1 kDa | Matches the authoritative product WB observation. | Confirm with orthogonal controls and the linked product record. |
| Additional band | May reflect processing, modification, or non-specific signal. | Run a dilution series and compare positive/negative controls. |
| Weak signal | Target abundance or transfer may be limiting. | Verify transfer, increase positive-control abundance, and bracket exposure. |
Experiment evidence
Western blot images showing SPI1 band
A01116-1 · SPI1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for SPI1 Western blot
🧪Use Spleen as the first positive-control candidate and Appendix as the HPA Not detected negative candidate.
Positive control: Spleen (High)
Negative control: Appendix (Not detected)
HPA protein score determines control status; other expression data is supporting context only.
HPA tissue expression evidence for SPI1
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 |
|---|---|---|---|---|
| Spleen | Reported tissue cells | High | Protein (HPA) | HPA → |
| Lung | Reported tissue cells | High | Protein (HPA) | HPA → |
| Skin | Reported tissue cells | High | Protein (HPA) | HPA → |
| Bone marrow | Reported tissue cells | High | Protein (HPA) | HPA → |
Section 3
Advanced SPI1 Western Blot Tips
Deeper troubleshooting and optimisation questions for SPI1, answered from its protein features.
Which band should guide the blot?
Use 31.1 kDa, the observation attached to the authoritative A01116-1 WB record.
How should calculated mass be interpreted?
Treat the UniProt calculated mass as context; it does not replace the catalog-observed 31.1 kDa expectation.
Which positive control should I start with?
Start with Spleen, the lead HPA protein-expression candidate.
Which negative control is defensible?
Use Appendix as an orthogonal HPA Not detected candidate.
Which gel should I use?
Use 12-15% consistently across the quick facts, protocol table, and poster.
What transfer method to use for SPI1 Western blot?
Use the transfer method in the recommended protocol and verify transfer before blocking.
How should A01116-1 be started?
Start at the linked datasheet condition and run a three-point primary-antibody dilution test.
Which publication-derived protocols can I compare?
No verified publication protocol was supplied; use only the deterministic recommended protocol.
Boster reagents
SPI1 Western Blot Reagents
Human/Mouse/Rat-reactive SPI1 Western blot reagents with authoritative product imagery.
Real WB data
Anti-PU.1/SPI1 Antibody Picoband®
Cat # A01116-1
Only image-backed, WB-validated Human/Mouse/Rat recommendations from the prepared catalog evidence are shown.
Source: prepared picoband-wb product evidence; each card retains its own SKU, URL, observed band, and authoritative WB image.
References
- UniProt P17947
- Human Protein Atlas — SPI1
- A01116-1 product record
- PMC13000193 — Spi-1 proto-oncogene regulates mRNA hypertranscription and malignant progression in head and neck cancer (Signal transduction and targeted therapy, 2026)
- PMC12708875 — Therapeutic targeting SPI1 in combination with erastin promotes ferroptosis in ccRCC (Communications biology, 2025)
- PMC9744896 — PRDM1/BLIMP1 induces cancer immune evasion by modulating the USP22-SPI1-PD-L1 axis in hepatocellular carcinoma cells (Nature communications, 2022)