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OTUB1 / Ubiquitin thioesterase OTUB1 · IHC design guide
Design Immunohistochemistry for OTUB1
Plan chromogenic IHC for OTUB1 using its general cytoplasmic tissue staining pattern (HPA tissue IHC). This guide covers fixation consistency, antibody incubation, controls and scoring, with attention to the lymphoid restriction of isoform 2 (UniProt).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
OTUB1 Immunohistochemistry Experimental Design Guide
Expected localisation, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
Must know before staining
| Expected localisation | Cytoplasmic staining in tissue (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic staining in glandular and neuronal cells (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A04361-1) | |
| Positive control | Adrenal gland+4 more · see all | |
| Negative control | None in HPA (detected in all 45 tissues); use no-primary + isotype controls |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation conditions consistent across sections. (standard IHC practice; not target-specific) | |
| Caveat | Staining shows medium consistency with RNA data (HPA tissue IHC) | |
| Regulation | Isoform 2 is lymphoid restricted (UniProt) | |
| Isoform / epitope | Two isoforms; antibody epitope coverage is unknown (UniProt; datasheet) |
Section 1
Recommended OTUB1 IHC & IF Protocols
The catalog antibody’s IHC-P protocol uses EDTA pH 8.0 retrieval (datasheet A04361-1). Four published OTUB1 IHC protocols provide tissue-specific examples (PMC11302878; PMC7106863; PMC4320819; PMC10444971).
| Sample | Paraffin-embedded human liver cancer tissue; fixative not specified (datasheet A04361-1) |
| Fixation | Image fixative and duration unreported (datasheet A04361-1); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: EDTA pH 8.0 (datasheet A04361-1); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A04361-1) |
| Primary antibody | Rabbit anti-OTUB1, 1-2 μg/ml (datasheet A04361-1) |
| Primary incubation | Overnight at 4 °C (datasheet A04361-1) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet A04361-1) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | OTUB1-positive staining in glandular cells of adrenal gland (HPA tissue IHC: Medium). HPA tissue profile: General cytoplasmic expression. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA pH 8.0 retrieval for the catalog antibody (datasheet A04361-1). The breast cancer study instead reports boiled sodium citrate retrieval (PMC10444971).
Section 2
What Is the Expected OTUB1 Staining Pattern?
OTUB1 should appear mainly in the cytoplasm of many cell types, including glandular, respiratory epithelial and neuronal cells (HPA: general cytoplasmic expression; listed tissues show Medium staining). Its approved tissue IHC profile has medium consistency with RNA expression (HPA: Approved reliability). OTUB1 is cytoplasmic and has no transmembrane segment (UniProt Q96FW1: subcellular location and topology).
| Cytoplasmic staining in glandular or respiratory epithelial cells. | This fits the reported pattern; glandular cells in breast and respiratory epithelial cells in bronchus show Medium staining (HPA: tissue IHC). Judge staining against cell identity and the cytoplasmic pattern together. Medium describes the HPA observations, not a required intensity for every section or antibody. |
| Strong nuclear-only staining with little cytoplasmic signal. | Question the result because the established locations are cytoplasm and cytosol (UniProt Q96FW1: subcellular location; HPA: subcellular ICC-IF). Review antibody specificity and detection controls before scoring nuclei as OTUB1 positive. The supplied sources do not support a nuclear-only tissue pattern. |
| Signal concentrated in an unexpected cell population. | Consider cross-reactivity or endogenous detection activity, especially if the expected cytoplasmic cells lack signal (HPA: general cytoplasmic expression). An unlisted cell type alone is not proof of artefact: OTUB1 isoform 1 is ubiquitous (UniProt Q96FW1: tissue specificity), and the supplied HPA list is not exhaustive. |
| Uniform colour across cells and surrounding tissue. | Treat poorly resolved, diffuse staining as background until a negative detection control is clean. General cytoplasmic expression can be widespread (HPA: tissue IHC), so assess whether colour follows identifiable cytoplasm and varies plausibly between cells; widespread staining alone does not establish specificity. |
| No cytoplasmic signal in a section expected to stain. | Check the run before interpreting a biological absence. Breast glandular cells and bronchial respiratory epithelial cells show Medium staining in the supplied profile (HPA: tissue IHC). A failed positive control could reflect retrieval, antibody or detection conditions; these are workflow possibilities, not established OTUB1 fixation effects. |
💡Expected OTUB1 appearanceCall a section positive when identifiable glandular, respiratory epithelial or neuronal cells show cytoplasmic staining consistent with the Medium observations (HPA: tissue IHC); isolated nuclear-only colour or uniform background warrants investigation (UniProt Q96FW1: cytoplasmic location).
| Tissue and isoform context | Isoform 1 is ubiquitous, while isoform 2 is reported in lymphoid tissues and peripheral blood mononuclear cells (UniProt Q96FW1: tissue specificity). The supplied IHC profile does not resolve isoforms, so lymphoid staining cannot be assigned to isoform 2 from location alone. |
| Relative tissue staining | The listed glandular, respiratory epithelial and neuronal populations show Medium staining; hepatocytes and several other listed populations show Low staining (HPA: tissue IHC). Use these as relative reference points, not absolute positive or negative thresholds. No negative tissue is supplied. |
| Antibody validation | Three listed antibodies have Approved IHC status (HPA: antibodies HPA039176, CAB072836, CAB080075). Approved status supports use of their reported patterns but does not establish Enhanced validation here (HPA: antibody validation summary). Compare the actual antibody and run controls with the selected reference tissue. |
| IF/ICC Q: What pattern is expected? | A: Mainly cytosolic signal, with additional cytoplasmic bodies, is reported in ICC-IF (HPA: approved subcellular locations). This helps interpret compartment differences, while tissue IHC remains the primary application here; the supplied ICC-IF record provides no protocol conditions. |
| Retrieval and epitope information | The supplied records give no OTUB1-specific retrieval condition or antibody epitope. Select retrieval from the IHC-validated antibody's instructions and assess it with controls as general IHC practice; do not infer fixation sensitivity from OTUB1 topology, modifications or HPA staining levels. |
| Situation | Likely cause | Next action |
|---|---|---|
| Expected cytoplasmic cells are blank. | An unsuccessful staining run is possible; Medium staining is reported in breast glandular and bronchial respiratory epithelial cells (HPA: tissue IHC). | Verify a reference section in the same run, then check retrieval, primary-antibody application and chromogenic detection against the antibody's IHC instructions. Do not label the sample OTUB1 negative while the reference fails. |
| Nuclei dominate the signal. | The pattern conflicts with cytoplasmic OTUB1 and approved cytosolic localisation (UniProt Q96FW1: location; HPA: subcellular ICC-IF). | Inspect no-primary and detection controls, review counterstain and chromogen interpretation, and repeat with the IHC-validated antibody if needed. Score a specific nuclear claim only with independent supporting evidence. |
| Stroma or other unexpected cells dominate. | Cross-reactivity or endogenous chromogenic activity may contribute; the HPA profile reports general cytoplasmic expression without excluding every unlisted cell type (HPA: tissue IHC). | Compare cell morphology and cytoplasmic distribution with a reference tissue. Run appropriate no-primary and endogenous-enzyme controls for the detection system before treating the unexpected pattern as OTUB1. |
| Colour is diffuse across tissue structures. | Background from detection or insufficient blocking is a general IHC possibility. Broad expression also makes widespread cellular staining plausible (HPA: general cytoplasmic expression). | Check the no-primary control, wash and blocking steps, and whether colour is confined to identifiable cell cytoplasm. Adjust conditions only after separating background from cellular signal. |
| Signal appears weak in hepatocytes. | Low staining is reported for hepatocytes (HPA: tissue IHC); low intensity there need not indicate a failed run. | Compare a Medium reference population, such as breast glandular cells, processed in the same run (HPA: tissue IHC). Base the run decision on that reference and detection controls, not hepatocytes alone. |
| Lymphoid staining is interpreted as isoform 2. | Isoform 2 has restricted lymphoid expression, but isoform 1 is ubiquitous (UniProt Q96FW1: tissue specificity); the supplied IHC observations are not isoform resolved. | Report the observation as OTUB1 staining unless an independently validated isoform-specific reagent or assay is available. Do not infer isoform identity from tissue location or chromogenic intensity alone. |
Experiment evidence
IHC & IF images showing OTUB1 staining
A04361-1 · IHCIHC analysis of OTUB1 using anti-OTUB1 antibody (A04361-1). OTUB1 was detected in a paraffin-embedded section of human liver cancer tissue.
A04361-1 · IHCIHC analysis of OTUB1 using anti-OTUB1 antibody (A04361-1). OTUB1 was detected in a paraffin-embedded section of human ovarian cancer tissue
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000167770-OTUB1/tissue/cerebral+cortex#imid_10152784
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000167770-OTUB1/tissue/colon#imid_10152694
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000167770-OTUB1/tissue/liver#imid_10152703
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000167770-OTUB1/tissue/kidney#imid_10152704
HPA · ICC-IF SK-MEL-30Human Protein Atlas immunofluorescence, SK-MEL-30, antibody CAB080075; green = OTUB1, blue = nucleus, red = microtubules.
HPA · ICC-IF SK-MEL-30Human Protein Atlas immunofluorescence, SK-MEL-30, antibody CAB080075; green = OTUB1, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for OTUB1 IHC & IF
🧪Run adrenal gland first and assess staining in its glandular cells (HPA: Medium in adrenal gland glandular cells). HPA detects OTUB1 in all 45 scored tissues, so no tissue is a validated negative; use no-primary and isotype controls, and treat unstained cells on the positive slide as staining contrasts rather than confirmed OTUB1-negative cells (HPA: no negative rows; detected in all 45 tissues).
Positive control tissue: Adrenal gland (Glandular cells, HPA Medium)
Negative control tissue: None in HPA: OTUB1 is detected in all 45 scored tissues. Use a no-primary (secondary-only) and an isotype control instead.
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show OTUB1 in SK-MEL-30, SiHa, U2OS, with annotated localisation: Cytosol (approved) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only section; a rabbit IgG control matched to the primary antibody’s clonality where known; and an OTUB1 knockout biological control (caption: rabbit primary; standard IHC controls). Block endogenous peroxidase for DAB detection and compare adrenal pigment against the no-primary section (caption: HRP/DAB detection; standard IHC practice).
⚠️Feasibility: No target-specific fixation window or fixation effect is reported, and the selected A04361-1 tissue-IHC caption does not state a fixative (caption: fixative unreported). Paraffin-section staining is shown after heat retrieval in EDTA at pH 8.0, but whether retrieval is required has not been established by a comparison in the supplied evidence (caption: EDTA heat retrieval). Frozen-section ease is unreported; ICC-IF images support examining cytosolic localization, while endogenous adrenal pigment may complicate DAB scoring (HPA: approved cytosol location; standard IHC practice).
HPA tissue IHC evidence for OTUB1
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — Medium consistency between antibody staining and RNA expression data.). 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 |
|---|---|---|---|---|
| Adrenal gland | Glandular cells | Medium | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Medium | Protein (IHC) | HPA → |
| Breast | Glandular cells | Medium | Protein (IHC) | HPA → |
| Bronchus | Respiratory epithelial cells | Medium | Protein (IHC) | HPA → |
| Caudate | Neuronal cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| None in HPA: OTUB1 is detected in all 45 scored tissues. Use a no-primary (secondary-only) and an isotype control instead. | ||||
Section 3
Advanced OTUB1 IHC Tips
Troubleshooting OTUB1 chromogenic IHC in paraffin sections, with one companion IF/ICC question.
Which retrieval condition should I try first for weak OTUB1 staining?
Use heat-mediated antigen retrieval in EDTA at pH 8.0 before chromogenic IHC (datasheet A04361-1). The selected paraffin-section example used this retrieval, a 10% goat serum block, 2 μg/ml primary antibody overnight at 4°C, and DAB detection (caption A04361-1). If staining is weak, check deparaffinisation, heating consistency, and reagent freshness before comparing shorter or longer retrieval on adjacent sections (standard IHC practice). Include a known positive section and a no-primary control with each condition, and assess cytoplasmic signal alongside tissue preservation (HPA: general cytoplasmic expression; standard IHC practice). Excess heating can impair morphology or increase background, so document the condition that gives interpretable cells (standard IHC practice).
Could fixation explain inconsistent OTUB1 staining between paraffin blocks?
Target-specific sensitivity to fixation is unknown because the selected tissue-IHC caption does not report a fixative (caption A04361-1). Record the fixative, delay before fixation, fixation duration, processing schedule, and section age for each block when investigating variation (standard IHC practice). For new specimens, compare matched fixation conditions while keeping retrieval at EDTA pH 8.0 and the starting primary concentration at 2 μg/ml (datasheet A04361-1; caption A04361-1). Assess staining in the same cell type and include a no-primary control so background changes are visible (standard IHC practice). Do not attribute a block difference to OTUB1 biology until processing differences have been examined (standard IHC practice).
What staining pattern should count as plausible OTUB1 signal?
Expect predominantly cytoplasmic staining in interpretable cells (UniProt Q96FW1: cytoplasm; HPA tissue IHC: general cytoplasmic expression). A cytosolic pattern, sometimes with cytoplasmic bodies, is consistent with approved subcellular IF observations, although those observations do not validate every IHC pattern (HPA subcellular: cytosol and cytoplasmic bodies). OTUB1 has no predicted transmembrane segment, so a sharply membrane-restricted pattern warrants scrutiny (UniProt Q96FW1: topology). Compare the pattern with a no-primary control and adjacent cellular morphology before calling faint DAB positive (standard IHC practice). Predominantly nuclear or extracellular staining should prompt a review of antibody specificity, retrieval, and section artefacts (UniProt Q96FW1: cytoplasm; standard IHC practice).
Can this IHC assay distinguish OTUB1 isoforms or modification states?
Do not assign an isoform from this staining alone: the antibody epitope and isoform selectivity are not supplied (catalog antibody: epitope not provided). Isoform 1 is ubiquitous, whereas isoform 2 is reported in lymphoid tissues and peripheral blood mononuclear cells (UniProt Q96FW1: tissue specificity). The OTU domain spans residues 80–271, and annotated modifications include residues 2, 16, and 26, but their effects on this antibody's staining are unknown (UniProt Q96FW1: domain and modified residues; catalog antibody: epitope not provided). Compare serial sections with an independently validated isoform-selective assay if that distinction matters (standard IHC validation practice). Keep intensity comparisons within similarly processed specimens because epitope accessibility can vary with processing (standard IHC practice).
How should I plan companion IF/ICC imaging of OTUB1?
Treat IF/ICC as a separately validated assay; the selected paraffin-section DAB caption establishes an IHC workflow, not an IF/ICC fixation or antibody protocol (caption A04361-1). Select a marker for the expected cell type in the specimen and use distinct fluorophores so OTUB1 localisation can be assessed within identified cells (standard multiplex IF practice). Check tissue autofluorescence without primary antibody, then choose spectrally separated dyes, including a far-red option when shorter wavelengths are crowded (standard IF practice). Because OTUB1 is cytoplasmic and lacks a transmembrane segment, test gentle permeabilisation after fixation to access an intracellular epitope, whose precise position is not supplied (UniProt Q96FW1: cytoplasm and topology; catalog antibody: epitope not provided). Compare signal with background and the predominantly cytosolic pattern reported by HPA (HPA subcellular: cytosol; standard IF practice).
How can I reduce diffuse brown background without losing OTUB1 signal?
Start by comparing the stained section with a no-primary control and checking whether brown signal follows intact cytoplasm or damaged tissue (HPA tissue IHC: general cytoplasmic expression; standard IHC practice). The selected example used a 10% goat serum block and a 2 μg/ml rabbit primary overnight at 4°C (caption A04361-1). For DAB detection, include an endogenous peroxidase block and inspect endogenous pigment before attributing diffuse color to antibody binding (standard chromogenic IHC practice). If background persists, optimise blocking, washing, primary concentration, and DAB development on matched sections (standard IHC practice). Keep the same detection timing across comparisons so differences remain interpretable (standard IHC practice).
How should I score OTUB1 across heterogeneous tissue sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and viable tissue area before scoring, since OTUB1 is broadly expressed and cell composition can change the apparent section average (UniProt Q96FW1: isoform 1 ubiquitous; standard IHC practice). For cellular intensity, use an H-score: assign 0–3 intensity grades and sum each grade multiplied by its percentage of cells, yielding 0–300 (standard IHC scoring practice). Alternatively, report the percentage of positive cells and, when spatial density matters, positive cells per mm² of viable tissue (standard IHC quantification practice). Normalise counts to the number of evaluable cells or measured viable area within the same annotated compartment (standard IHC practice). Use matched retrieval, antibody incubation, DAB development, and scoring thresholds across specimens (standard IHC practice).
How do I separate true OTUB1 positivity from staining artefact?
Prioritise signal within intact cytoplasm, consistent with the general tissue-IHC pattern and approved cytosolic localisation (HPA tissue IHC: general cytoplasmic expression; HPA subcellular: cytosol). Review edge-only staining, necrotic regions, pigment, and no-primary controls before accepting a DAB-positive cell (standard chromogenic IHC practice). Check which cell type is positive: HPA reports low staining in liver hepatocytes, while the selected image documents detection in a human liver cancer section (HPA tissue IHC: liver hepatocytes low; caption A04361-1). That image alone does not establish a general tumor-specific increase or an isoform identity (caption A04361-1; catalog antibody: isoform selectivity not supplied). Repeat questionable patterns on a well-preserved serial section with matched retrieval and peroxidase blocking (standard IHC practice).
Boster reagents
Best OTUB1 / Ubiquitin thioesterase OTUB1 IHC Antibodies
A04361-1 has real paraffin-section IHC images from human liver cancer, ovarian cancer and rectum adenocarcinoma, and mouse ovary (catalog IHC captions). No IF image is provided (catalog IF image list).
Real IHC data
Anti-OTUB1 Antibody ®
Cat # A04361-1
A04361-1 was shown in paraffin sections of human liver cancer, ovarian cancer and rectum adenocarcinoma, and mouse ovary (catalog IHC captions). Its listed applications include IHC but not IF/ICC (catalog applications).
Which to pick: Choose A04361-1 for paraffin-section IHC in human or mouse tissue: its captions show those species with EDTA retrieval and 2 μg/ml primary antibody; the fixative is unreported (catalog IHC captions). No listed SKU has IF/ICC validation, so there is no supported IF/ICC pick here (catalog applications; catalog IF image list). For cross-species planning, A04361-1 lists human, mouse and rat reactivity, while its IHC images cover human and mouse only (catalog reactivity; catalog IHC captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q96FW1 (OTUB1_HUMAN, Ubiquitin thioesterase OTUB1).
- Human Protein Atlas. OTUB1 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. OTUB1 subcellular location (ICC-IF): Mainly localized to the cytosol. In addition localized to the cytoplasmic bodies..
- Human Protein Atlas. OTUB1 antibody validation summary (3 antibodies).
- Target deubiquitinase OTUB1 as a therapeatic strategy for BLCA via β-catenin/necroptosis signal pathway. International journal of biological sciences 2024 — PMC11302878.
- OTUB1-mediated deubiquitination of FOXM1 up-regulates ECT-2 to promote tumor progression in renal cell carcinoma. Cell & bioscience 2020 — PMC7106863.
- OTUB1 de-ubiquitinating enzyme promotes prostate cancer cell invasion in vitro and tumorigenesis in vivo. Molecular cancer 2015 — PMC4320819.
- OTUB1 inhibits breast cancer by non-canonically stabilizing CCN6. Clinical and translational medicine 2023 — PMC10444971.
- PubMed PMID:12704427 — UniProt-cited evidence.
- PubMed PMID:14661020 — UniProt-cited evidence.
- PubMed PMID:11042152 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for OTUB1 (Ubiquitin thioesterase OTUB1). Expected localisation Cytoplasmic staining in tissue (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A04361-1). Validated IHC antibody: A04361-1 at 1-2 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Adrenal gland (Glandular cells); negative None in HPA (detected in all 45 tissues); use no-primary + isotype controls. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human liver cancer tissue; fixative not specified (datasheet A04361-1); 2. Fixation: Image fixative and duration unreported (datasheet A04361-1); verify before use.; 3. Sectioning: 4–5 µm sections on charged slides (standard); 4. Deparaffinisation: Xylene, graded ethanol series to water (standard); 5. Antigen retrieval: Heat retrieval: EDTA pH 8.0 (datasheet A04361-1); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A04361-1); 8. Primary antibody: Rabbit anti-OTUB1, 1-2 μg/ml (datasheet A04361-1); 9. Primary incubation: Overnight at 4 °C (datasheet A04361-1). Watch for: Fixation: Keep fixation conditions consistent across sections. (standard IHC practice; not target-specific); Caveat: Staining shows medium consistency with RNA data (HPA tissue IHC); Isoform / epitope: Two isoforms; antibody epitope coverage is unknown (UniProt; datasheet); Regulation: Isoform 2 is lymphoid restricted (UniProt). Evidence: UniProt Q96FW1, HPA tissue IHC · Approved, HPA ICC-IF · Mainly localized to the cytosol. In addition localized to the…, Datasheet A04361-1, PMC11302878, PMC7106863. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/OTUB1/immunohistochemistry-ihc-guide.