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NKX2-1 / Homeobox protein Nkx-2.1 · Western blot design guide
Design a Western Blot for NKX2-1
Real validated NKX2-1 Western blot protocols, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-NKX2-1 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
NKX2-1 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 | ~38.6 kDa | |
| Gel | 12–15% (standard starting point) | |
| Positive control | Lung (IHC candidate; verify WB) +3 more | |
| Negative control | Adipose tissue (IHC candidate; verify WB) |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Phosphorylated | |
| Caveat | Phosphorylation-state controls | |
| Gene-set association | MSigDB C7 membership | |
| Isoform | 2 isoform(s) |
Section 1
Real Curated NKX2-1 Western Blot Protocols
The A01322 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | human lung tissue lysate (catalog A01322) |
| 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 | A01322 · (A) 0.25 and (B) 0.5 μg/ml (catalog A01322) |
| 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 NKX2-1 Western Blot Band Size?
NKX2-1 has a predicted mass of 38.6 kDa; isoforms may affect migration, but no empirical band size or distinct isoform pattern is established.
| Band near 38.6 kDa | Consistent with the predicted NKX2-1 mass; confirm identity with controls. |
| Two discrete bands | Could reflect isoforms 1 and 3; their migration difference is unverified. |
| Single dominant band | The two annotated isoforms need not resolve as separate bands. |
| Band enriched in a nuclear fraction | Consistent with NKX2-1 nuclear localization. |
💡Expected NKX2-1 appearanceUniProt predicts 38.6 kDa, but no empirical band size is supplied; assess any detected band with antibody specificity controls and nuclear fractionation.
| UniProt predicted mass | Places the reference band near 38.6 kDa; observed migration is unavailable. |
| Isoform 1 | May migrate differently from isoform 3; its size is unspecified. |
| Isoform 3 | May migrate differently from isoform 1; its size is unspecified. |
| Alternative splicing | Could produce different band positions, but resolvable bands are unverified. |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | Nuclear NKX2-1 may be poorly represented in the sample. | Check nuclear enrichment and a positive control. |
| Band higher than expected | An isoform could migrate differently; the cause is unverified. | Compare a validated positive control and antibody specificity controls. |
| Band lower than expected | An isoform could migrate differently; the cause is unverified. | Check antibody specificity and compare a validated positive control. |
| Multiple bands | Isoforms 1 and 3 are annotated, but distinct migration is unverified. | Check which bands track with NKX2-1 in specificity controls. |
| Weak or no signal | The nuclear target may be dilute in whole-cell lysate. | Test a nuclear fraction alongside a positive control. |
Experiment evidence
Western blot images showing NKX2-1 band
A01322 · NKX2-1
M01322-3 · NKX2-1
M01322-4 · NKX2-1
M01322-1 · NKX2-1
A30726 · NKX2-1
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for NKX2-1 Western blot
🧪HPA-IHC candidate guidance (verify in WB): For positive controls for NKX2-1 in Western blot, you can use lung tissue lysate.
Positive control: Lung (IHC candidate; verify WB)
Negative control: Adipose tissue (IHC candidate; verify WB)
Loading controls: Run GAPDH, β-actin, and a total-protein stain alongside the samples.
⚠️Feasibility: Because NKX2-1 is nuclear, nuclear enrichment may improve detection in tissue lysates.
HPA tissue expression evidence for NKX2-1
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 |
|---|---|---|---|---|
| Lung | alveolar cells type I | High | Protein (IHC) | HPA → |
| Thyroid gland | glandular cells | High | Protein (IHC) | HPA → |
| Bronchus | respiratory epithelial cells | Medium | Protein (IHC) | HPA → |
| Nasopharynx | respiratory epithelial 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 → |
| Appendix | glandular cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | adipocytes | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced NKX2-1 Western Blot Tips
Deeper troubleshooting and optimisation questions for NKX2-1, answered from its protein features.
How should NKX2-1 band migration be interpreted?
Band shift · Use the separately labelled calculated mass and catalog-observed evidence above. A sequence annotation does not establish an observed migration shift. Verify target identity with orthogonal controls.
How could NKX2-1 isoforms affect band interpretation?
Isoforms · UniProt lists isoforms 1 and 3. In isoform 3, the initial methionine is replaced by a longer N-terminal sequence. Check which isoform your antibody recognizes before assigning separate bands to isoforms; the supplied features do not establish their apparent band positions.
The listed sequence difference is at the N terminus. Check that the antibody epitope lies outside that differing region if you need to detect both isoforms, and confirm its stated isoform coverage.
The listed sequence difference is at the N terminus. Check that the antibody epitope lies outside that differing region if you need to detect both isoforms, and confirm its stated isoform coverage.
Could phosphorylation shift the NKX2-1 band?
PTM · UniProt lists phosphoserine at position 254 in its numbering. This establishes a modification site, but does not show that phosphorylation produces a visible band shift or explain any difference from 38.6 kDa.
Does this guide establish induction of NKX2-1?
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 NKX2-1?
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 A01322 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.
How should I quantify NKX2-1 across samples?
Quantitation · Decide whether to measure total NKX2-1 or a particular isoform, since two isoforms are listed. Use an antibody with appropriate isoform coverage and quantify the same verified band or bands across samples.
What molecular weight should I expect for NKX2-1?
Interpretation · The supplied predicted mass is 38.6 kDa. No observed band position is available, so use this as a reference rather than an exact apparent mass.
UniProt places NKX2-1 in the nucleus. A nuclear fraction is therefore a reasonable sample to examine when the signal in a whole-cell sample is difficult to detect.
Compare them with the 38.6 kDa prediction and consider the two listed isoforms and phosphoserine at UniProt position 254. None of these features alone identifies an unexpected band or demonstrates a visible phosphorylation shift; verify band identity before assigning a cause.
UniProt places NKX2-1 in the nucleus. A nuclear fraction is therefore a reasonable sample to examine when the signal in a whole-cell sample is difficult to detect.
Compare them with the 38.6 kDa prediction and consider the two listed isoforms and phosphoserine at UniProt position 254. None of these features alone identifies an unexpected band or demonstrates a visible phosphorylation shift; verify band identity before assigning a cause.
Boster reagents
NKX2-1 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-Homeobox protein Nkx-2.1 NKX2-1 Antibody
Cat # A01322
Real WB data
Anti-TTF1 Rabbit Monoclonal Antibody
Cat # M01322-3
Real WB data
Anti-TTF1 Rabbit Monoclonal Antibody
Cat # M01322-4
Real WB data
Anti-TTF1 NKX2-1 Rabbit Monoclonal Antibody
Cat # M01322-1
Real WB data
Anti-TTF-1 NKX2-1 Antibody
Cat # A30726
Five the supplier anti-NKX2-1 antibodies list human, mouse and rat reactivity and have WB images. The captions show specific lysates and conditions, including a 39–42 kDa band for M01322-1. These examples do not establish performance across all samples; no publication evidence was supplied.
Which to pick: Choose by the closest pictured sample: A01322 for human lung tissue, M01322-3 for rat lung cells, M01322-4 for HeLa cells, or A30726 for NIH/3T3 cells. M01322-1 shows human cell lines plus rat and mouse lung tissue, with detailed WB conditions.
Source: BosterBio NKX2-1 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry P43699.
- Human Protein Atlas. NKX2-1 tissue expression.
- PMC12262185 — target-verified WB comparison
- PMC10664179 — target-verified WB comparison
- PMC9888430 — target-verified WB comparison