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- Table of Contents
PIWIL2 / Piwi-like protein 2 · Western blot design guide
Design a Western Blot for PIWIL2
Source-linked PIWIL2 Western blot protocol options, expected-band and isoform facts, troubleshooting for weak or shifted signal, and recommended anti-PIWIL2 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
PIWIL2 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 | ~109.8 kDa | |
| Gel | 8–10% (standard starting point) | |
| Negative control | Suggested KO / knockdown lysate |
Important caveats
Reasons your observed band may differ from the expected size.
| PTM | Methylated | |
| Caveat | Antibody identity mismatch | |
| Gene-set association | MSigDB C7 membership | |
| Isoform | 2 isoform(s) |
Section 1
Source-Linked PIWIL2 Western Blot Protocol Options
The A04654-1 protocol combines labelled catalog values with standard starting conditions. Published comparisons retain their own sample, reagent and detection scope.
| Sample / lysate | HepG2 cell lysate (catalog A04654-1) |
| Gel % | 8–10% (standard starting point) |
| Load | 20–30 µg total protein per lane; optimize for abundance (standard starting point) |
| Transfer | Wet/tank transfer; optimize duration (standard starting point) |
| Membrane | 0.45 µm PVDF (standard starting point) |
| Blocking | 5% milk or 5% BSA in TBST (standard starting point) |
| Primary antibody | A04654-1 · 1 μg/mL (catalog A04654-1) |
| 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 PIWIL2 Western Blot Band Size?
PIWIL2 is predicted at 109.8 kDa; alternative splicing could affect size, but no empirical migration or resolvable isoform pattern is supplied.
| Single band near 109.8 kDa | Consistent with the predicted PIWIL2 mass; confirm identity with controls |
| Several bands at different sizes | Isoforms 1 and 2 could contribute, but distinct migration is unconfirmed |
| Band above 109.8 kDa | Identity and cause of the higher apparent mass require validation |
| Band below 109.8 kDa | An isoform is possible, but its mass and migration are unknown |
💡Expected PIWIL2 appearanceFull-length PIWIL2 has a predicted mass of 109.8 kDa; no empirical band size is supplied, and isoform-dependent migration requires band-identity controls.
| Predicted PIWIL2 mass | Places the full-length reference near 109.8 kDa |
| Alternative splicing | May change protein size, but no isoform masses are supplied |
| Isoform 1 | Its individual apparent band size is unknown |
| Isoform 2 | Its size relative to isoform 1 is unknown |
| Situation | Likely cause | Next action |
|---|---|---|
| No band in lysate | PIWIL2 is associated with germ-cell structures, so the sample may have little expression | Check expression in the sample and include a suitable positive control |
| Band higher than expected | No supplied feature establishes an upward shift | Verify identity with PIWIL2 depletion and an independent antibody |
| Band lower than expected | An isoform is possible, but no isoform mass is supplied | Check antibody epitope coverage and confirm the band by PIWIL2 depletion |
| Multiple bands | Isoforms 1 and 2 may contribute; distinct migration is unconfirmed | Compare epitope coverage and test which bands respond to PIWIL2 depletion |
| Weak or no signal | Low PIWIL2 abundance in the sampled cells is possible | Use a suitable positive control and check sample expression |
Experiment evidence
Western blot images showing PIWIL2 band
A04654-1 · PIWIL2
← swipe / scroll for more images →
Real WB data behind the band-size expectations in this section.
Sample controls for PIWIL2 Western blot
🧪For positive controls for PIWIL2 in Western blot, you can use a sample with independently confirmed PIWIL2 expression, since no HPA positive tissue or cell is supplied.
Positive control: No high/medium HPA tissue identified
Negative control: Suggested KO / knockdown lysate
Loading controls: Run GAPDH, β-actin, and a total-protein stain alongside the samples.
⚠️Feasibility: PIWIL2 is cytoplasmic, but the supplied HPA record identifies no validated positive or negative tissue.
HPA tissue expression evidence for PIWIL2
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 |
|---|---|---|---|---|
| No high/medium HPA tissues identified in the supplied evidence. | ||||
Lower expression tissues · IHC evidence, not confirmed WB-negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| No lower-expression tissue rows available in the supplied evidence. | ||||
Section 3
Advanced PIWIL2 Western Blot Tips
Deeper troubleshooting and optimisation questions for PIWIL2, answered from its protein features.
Where should the main PIWIL2 band appear?
Band shift · The predicted mass of canonical PIWIL2 is 109.8 kDa. No observed band position is supplied, so use this as a starting point and verify band identity independently; the listed features do not establish an apparent mass or a visible shift.
Could PIWIL2 isoforms produce different bands?
Isoforms · Yes. Isoform 2 lacks residues 887–922 relative to isoform 1, so it has a shorter sequence. The features do not establish whether the isoforms resolve as separate bands. Check which isoform your antibody recognizes before assigning a band.
Do annotated modifications prove a band shift?
PTM · The linked UniProt record describes protein features. A modification annotation alone does not demonstrate a visible shift; retain any condition or experimental qualifier attached to it.
Does this guide establish induction of PIWIL2?
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.
What transfer method to use for PIWIL2 Western blot?
Transfer · Choose and verify a transfer setup suitable for the predicted 109.8 kDa protein. Check protein transfer to the membrane and whether target-sized material remains in the gel. The supplied features do not specify a membrane type or transfer conditions.
How should blocking be optimized?
Blocking · Standard workflow guidance: follow the A04654-1 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 total PIWIL2 and methylated PIWIL2 be quantified?
Quantitation · Measure total PIWIL2 and methylation-specific signal separately if both are of interest. Confirm that each antibody recognizes the intended sequence or modification, since PIWIL2 has two isoforms and several annotated arginine methylation sites. Compare like bands across samples; the features alone cannot identify which methylation states an antibody detects.
Which PIWIL2 methylation sites matter when interpreting bands?
Interpretation · UniProt lists symmetric dimethylarginine at residues 47, 146, 158, 165 and 551, plus alternate methylation states at 76, 97 and 102. PRMT5 is specified for methylation at 76, 97, 102, 165 and 551 as indicated by the individual annotations. These sites do not by themselves predict a visible band shift. Positions use the supplied UniProt sequence numbering.
Check whether an additional band is consistent with isoform 2, which lacks residues 887–922, and whether the antibody recognizes both isoforms. PIWIL2 also has annotated arginine methylation, but those features alone cannot explain a particular band shift. Confirm band identity before assigning either explanation.
PIWIL2 is annotated in the cytoplasm and noted as present in the chromatoid body, with a probable role in the meiotic nuage. A cytoplasmic fraction is therefore relevant when choosing samples. The supplied features do not establish detection levels in any particular tissue or preparation.
Check whether an additional band is consistent with isoform 2, which lacks residues 887–922, and whether the antibody recognizes both isoforms. PIWIL2 also has annotated arginine methylation, but those features alone cannot explain a particular band shift. Confirm band identity before assigning either explanation.
PIWIL2 is annotated in the cytoplasm and noted as present in the chromatoid body, with a probable role in the meiotic nuage. A cytoplasmic fraction is therefore relevant when choosing samples. The supplied features do not establish detection levels in any particular tissue or preparation.
Boster reagents
PIWIL2 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-PIWI-L2 Antibody
Cat # A04654-1
The catalog reports one anti-PIWIL2 antibody, A04654-1, with stated human and mouse reactivity. Its WB caption reports HepG2 cell lysate at 1 μg/mL, but names a PIWI-L1 antibody, so the image’s antibody identity is unclear.
Which to pick: A04654-1 is the only listed option. It has a WB image with a reported HepG2 sample, but confirm the antibody used before relying on that image; the caption names PIWI-L1 despite the PIWI-L2 product name.
Source: BosterBio PIWIL2 gene-info card — filtered to Western-blot-capable antibodies; each card shows that product's actual WB validation figure.
References
- UniProt Consortium. UniProt entry Q8TC59.
- Human Protein Atlas. PIWIL2 tissue expression.
- PMC3267750 — target-verified WB comparison
- PMC4571108 — target-verified WB comparison
- PMC8573518 — target-verified WB comparison