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OTUB2 / Ubiquitin thioesterase OTUB2 · IHC design guide
Design Immunohistochemistry for OTUB2
Plan chromogenic OTUB2 IHC in paraffin sections with the catalog antibody at 1:100–1:300 (datasheet A10542-1). Use testis as a positive reference and score cytoplasmic staining in elongated or late spermatids by cell type (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
OTUB2 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 in elongated or late spermatids (HPA tissue IHC) | |
| Staining pattern | Distinct cytoplasmic staining in elongated or late spermatids (HPA tissue IHC) | |
| Antigen retrieval | Tris-EDTA pH 9.0 HIER, heat-mediated (datasheet A10542-1) | |
| Positive control | Testis+1 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent across sections. (standard IHC practice; not target-specific) | |
| Caveat | Staining depends on the presence of late spermatids (HPA tissue IHC) | |
| Regulation | Staining-linked regulation is unreported (UniProt) | |
| Isoform / epitope | 2 isoforms; epitope differences are unspecified (UniProt) |
Section 1
Recommended OTUB2 IHC & IF Protocols
Start with the catalog antibody’s IHC-P protocol, then compare the 4 published OTUB2 IHC protocols below (datasheet A10542-1; PMC9290284; PMC7563931; PMC12034018; PMC11446981).
| Sample | Paraffin-embedded human tonsil tissue; fixative not specified (datasheet A10542-1) |
| Fixation | Image fixative and duration unreported (datasheet A10542-1); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: Tris-EDTA pH 9.0 (datasheet A10542-1); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% normal serum of the secondary host, 30 min, room temperature (standard) |
| Primary antibody | Rabbit anti-OTUB2, 1:100-1:300 (datasheet A10542-1) |
| Primary incubation | Overnight at 4 °C (standard) |
| Detection | HRP-polymer secondary, DAB chromogen 5–10 min (standard) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | OTUB2-positive staining in elongated or late spermatids of testis (HPA tissue IHC: High). HPA tissue profile: Distinct cytoplasmic expression in spermatids in testis. No signal in the no-primary control. |
💡Decision noteFor the catalog antibody, try heat-mediated Tris-EDTA retrieval at pH 9.0 first (datasheet A10542-1). The ESCC study used citric acid retrieval (PMC9290284).
Section 2
What Is the Expected OTUB2 Staining Pattern?
OTUB2 should show predominantly cytoplasmic staining in elongated or late spermatids in testis, with weaker staining in placental trophoblastic cells (HPA tissue IHC). This compartment assignment comes from the observed testis pattern; UniProt does not annotate a subcellular location, although OTUB2 has no transmembrane segment (UniProt Q96DC9). HPA rates the tissue IHC evidence Enhanced for consistency with RNA data, pending external verification (HPA tissue IHC).
| Strong cytoplasmic staining in elongated or late spermatids. | This matches the most distinctive reported positive pattern: High staining in those testicular cells (HPA tissue IHC). Judge the result by both cell type and compartment; widespread staining elsewhere in the section does not strengthen this match. HPA's Enhanced rating reflects consistency with RNA data and remains pending external verification (HPA tissue IHC). |
| Predominantly nuclear staining in spermatids, with little cytoplasmic signal. | This conflicts with the distinct cytoplasmic testis pattern (HPA tissue IHC). Treat it as a possible staining artefact and check the controls and detection conditions (standard IHC practice). UniProt gives no subcellular location, so these data do not prove that every nuclear signal is impossible (UniProt Q96DC9). |
| Strong staining in an unexpected cell type, such as testicular cells outside the reported spermatid population. | The reported High testis signal is assigned to elongated or late spermatids (HPA tissue IHC). An unexpected distribution may reflect cross-reactivity or endogenous detection activity; examine a negative control before assigning it to OTUB2 (standard IHC practice). The HPA summary alone cannot establish the identity of every additional stained cell. |
| Diffuse colour across cells and tissue spaces without a clear spermatid pattern. | A uniform haze does not reproduce the distinct cytoplasmic spermatid pattern (HPA tissue IHC). It may arise from background in antibody incubation, blocking or chromogenic detection (standard IHC practice). Assess signal against a matched negative control and inspect whether cellular boundaries and the expected positive population remain discernible. |
| No visible staining in elongated or late spermatids in testis. | Those cells are a reported High positive population, so a blank result warrants a technical check before concluding that OTUB2 is absent (HPA tissue IHC; standard IHC practice). Review section quality, antigen retrieval, antibody incubation and detection with appropriate run controls. HPA's tissue profile is a reference pattern, not a guarantee for every specimen. |
💡Expected OTUB2 appearanceCall the IHC result concordant when elongated or late spermatids show High, predominantly cytoplasmic signal (HPA tissue IHC); broad nuclear colour, unexpected cell staining or diffuse haze warrants control-based review (HPA tissue IHC; standard IHC practice).
| Tissue and cell selection | Testis provides a reported High positive population in elongated or late spermatids; placental trophoblastic cells are Medium (HPA tissue IHC). Adipocytes in adipose tissue are Not detected in the supplied profile (HPA tissue IHC). Compare the specified cell populations rather than treating an entire tissue as uniformly positive or negative. |
| Antibody validation | Both listed rabbit polyclonal antibodies, HPA002329 and HPA075090, have Enhanced IHC status (HPA antibodies). Enhanced denotes agreement with independent antibodies or orthogonal data in the supplied validation definition; the tissue reliability summary specifically notes consistency with RNA and pending external verification (HPA tissue IHC). |
| Topology and processing | OTUB2 has no annotated transmembrane segment, signal peptide or propeptide; its annotated chain spans residues 1–234 (UniProt Q96DC9). These facts do not specify an epitope or prove a subcellular compartment. Use the observed cytoplasmic spermatid pattern for slide interpretation (HPA tissue IHC). |
| Isoforms and epitope scope | UniProt lists 2 isoforms, but the supplied record does not locate either antibody's epitope or distinguish isoform staining (UniProt Q96DC9; HPA antibodies). Do not infer isoform-specific tissue patterns from these IHC observations; check documented antibody information if an isoform-specific conclusion is required. |
| Can IF/ICC confirm the compartment? | HPA provides no main IF/ICC location, no cell lines with ICC-IF images and no ICC validation status for the listed antibodies (HPA subcellular; HPA antibodies). The cytoplasmic expectation here rests on tissue IHC (HPA tissue IHC). Interpret any separate IF/ICC experiment with its own controls (standard IF practice). |
| Situation | Likely cause | Next action |
|---|---|---|
| Testis positive control is blank. | The observed High spermatid signal has not been reproduced (HPA tissue IHC); the failed step is unknown. | Check tissue preservation and the run control, then review retrieval, primary incubation and chromogenic detection one step at a time (standard IHC practice). Do not attribute the failure to OTUB2-specific fixation sensitivity: none is reported in the supplied sources. |
| Signal is mainly nuclear in the expected spermatids. | The compartment differs from the reported cytoplasmic testis pattern (HPA tissue IHC); a specific cause is unproven. | Compare with a negative control and reassess localisation at high magnification (standard IHC practice). Record the discrepancy rather than assigning nuclear OTUB2 from this result alone; UniProt supplies no location annotation (UniProt Q96DC9). |
| Unexpected cells stain as strongly as spermatids. | Cross-reactivity or endogenous detection activity is possible (standard IHC practice); the reported High population is elongated or late spermatids (HPA tissue IHC). | Inspect a matched negative control and review blocking and detection controls (standard IHC practice). Identify the stained cell type before scoring it as OTUB2 positive; HPA's summary does not validate that new cell-specific pattern. |
| The section shows diffuse brown background. | Nonspecific antibody binding or chromogenic detection background is possible (standard IHC practice). | Compare background with a negative control, then review blocking, primary antibody concentration, washing and detection conditions (standard IHC practice). Score only interpretable cellular staining; the reference pattern is distinct cytoplasmic spermatid signal (HPA tissue IHC). |
| Placenta stains less strongly than testis. | That difference can fit the supplied profile: trophoblastic cells are Medium and elongated or late spermatids are High (HPA tissue IHC). | Compare the named cell populations and assess each against its own background (standard IHC practice). Avoid requiring equal colour intensity across tissues to accept a run; the HPA categories describe different observed levels (HPA tissue IHC). |
| A designated HPA negative cell population shows colour. | Adipocytes in adipose tissue are reported Not detected, so convincing staining there needs investigation (HPA tissue IHC). | Check morphology and the matched negative control, then reassess nonspecific binding or endogenous detection activity (standard IHC practice). Treat a discordant result as unresolved until controls support it; Not detected is the reported observation, not proof of universal absence. |
Experiment evidence
IHC & IF images showing OTUB2 staining
A10542-1 · IHCImmunohistochemical analysis of paraffin-embedded human tonsil. 1, Antibody was diluted at 1:200 (4° overnight). 2, Tris-EDTA, pH9.0 was use
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000089723-OTUB2/tissue/cerebral+cortex#imid_20996139
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000089723-OTUB2/tissue/colon#imid_20996073
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000089723-OTUB2/tissue/liver#imid_20996074
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000089723-OTUB2/tissue/kidney#imid_20996075
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for OTUB2 IHC & IF
🧪Run testis first and require staining in elongated or late spermatids (HPA: High in elongated or late spermatids). Use adipose tissue adipocytes as the biological comparison (HPA: Not detected in adipocytes); on the testis slide, assess other cells for background staining without assuming they lack OTUB2 (HPA: cell-specific positive call only).
Positive control tissue: Testis (Elongated or late spermatids, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA carries no ICC-IF cell line for OTUB2; derive a cell-line control from the positive tissue's cell type (Elongated or late spermatids) and confirm it by RNA or western blot first.
Technical controls: Include a no-primary, secondary-only control and a host-species-matched isotype control for a monoclonal antibody, or matched nonimmune IgG for a polyclonal antibody (standard IHC practice); use OTUB2 knockout material as a specificity control if available (standard IHC practice). For chromogenic testis IHC, quench and check endogenous peroxidase activity; if using biotin-based detection, control for endogenous biotin (standard IHC practice).
⚠️Feasibility: No target-specific fixation window or fixation effect is reported in the supplied evidence, and the selected catalog antibody caption does not state a fixative (selected SKU A10542-1 tissue-IHC caption: fixative unreported). The paraffin-section example uses Tris-EDTA retrieval at pH 9.0 and a 1:200 primary dilution overnight at 4°C, but does not establish whether retrieval is required under other conditions (selected SKU A10542-1 tissue-IHC caption). The supplied evidence does not establish whether frozen sections or IF are easier, and lists no ICC-IF images for this gene; check testis sections for endogenous peroxidase background when interpreting chromogenic signal (HPA subcellular record: no ICC-IF images; standard IHC practice).
HPA tissue IHC evidence for OTUB2
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — High consistency between antibody staining and RNA expression data. Pending external verification.). 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 |
|---|---|---|---|---|
| Testis | Elongated or late spermatids | High | Protein (IHC) | HPA → |
| Placenta | Trophoblastic cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended 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 → |
| Bone marrow | Hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Breast | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Caudate | Glial cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced OTUB2 IHC Tips
Troubleshoot OTUB2 staining in paraffin sections using the catalog antibody’s tissue image and cell-specific expression references; assess IF as a separate application.
Which retrieval conditions should I start with for OTUB2 paraffin-section IHC?
Start with heat-mediated Tris-EDTA antigen retrieval at pH 9.0 for paraffin sections (datasheet A10542-1). The catalog antibody’s human tonsil image used that retrieval, a 1:200 primary dilution overnight at 4°C, and a 1:200 secondary for 45 minutes at room temperature (caption A10542-1). If staining is weak, compare retrieval duration across adjacent sections while holding antibody dilution and detection constant (standard IHC practice). Check whether signal improves in the expected cell population without increased diffuse background or tissue damage (standard IHC practice; HPA: high staining in late spermatids). Record the actual heating and cooling conditions because the caption does not specify them (caption A10542-1).
Could fixation explain weak or uneven OTUB2 staining in paraffin sections?
OTUB2-specific sensitivity to fixation is unknown: the selected paraffin-section caption does not state a fixative (caption A10542-1). Do not infer fixation tolerance from the tissue staining pattern or the absence of a transmembrane segment and annotated modifications (HPA: tissue IHC; UniProt Q96DC9: topology and modified residues). For troubleshooting, compare sections with documented fixation histories using the same pH 9.0 retrieval and 1:200 primary dilution (datasheet A10542-1; standard IHC practice). Assess morphology alongside staining intensity, especially at tissue edges and in damaged regions (standard IHC practice). If fixation histories differ, report that limitation before attributing intensity differences to OTUB2 abundance (standard IHC practice).
What staining pattern should I expect, and how should I handle nuclear signal?
Use distinct cytoplasmic staining in elongated or late spermatids as the strongest supplied localisation reference for tissue IHC (HPA: testis profile; high in late spermatids). UniProt provides no subcellular localisation annotation for OTUB2, so nuclear staining alone has no independent support here (UniProt Q96DC9: subcellular location not annotated). Review the counterstain and cell morphology before assigning signal to a compartment, particularly in densely packed cells (standard IHC practice). Compare neighbouring sections processed with identical pH 9.0 retrieval and detection conditions (datasheet A10542-1; standard IHC practice). Treat unexpected nuclear or membrane-dominant staining as a pattern requiring corroboration, not automatic evidence of OTUB2 distribution (HPA: cytoplasmic spermatids; standard IHC practice).
Can this antibody distinguish OTUB2 isoforms or reveal a masked epitope?
OTUB2 has 2 annotated isoforms, while the supplied antibody caption does not identify its epitope or establish isoform selectivity (UniProt Q96DC9: isoforms 1 and 2; caption A10542-1). Its OTU domain spans residues 40–231, but that range does not locate the antibody’s binding site (UniProt Q96DC9: domain; caption A10542-1). Avoid interpreting a missing stain as absence of both isoforms without epitope information or independent validation (standard IHC practice). Keep pH 9.0 retrieval constant when comparing specimens so retrieval does not confound the comparison (datasheet A10542-1; standard IHC practice). If available, compare an independently characterised antibody or an orthogonal expression measurement in the same cell population (standard IHC practice).
How should I adapt the OTUB2 question to multiplex immunofluorescence?
Treat IF as a separate application because the supplied catalog image documents paraffin-section chromogenic IHC, not IF validation (caption A10542-1). Pair OTUB2 with a validated marker that identifies the cell population of interest, such as late spermatids when examining testis (HPA: high in elongated or late spermatids; standard IF practice). Select spectrally separated fluorophores and consider a far-red channel if tissue autofluorescence obscures shorter-wavelength signal (standard IF practice). OTUB2 has no annotated transmembrane segment; use controlled permeabilisation when probing an intracellular epitope, while recognising that the exact antibody epitope is unspecified (UniProt Q96DC9: topology; caption A10542-1; standard IF practice). Include single-label and secondary-only controls before interpreting colocalisation (standard IF practice).
How can I reduce diffuse or cell-specific background without losing OTUB2 signal?
First inspect a section without primary antibody to identify secondary-detection or endogenous-enzyme signal (standard chromogenic IHC practice). Use an appropriate peroxidase block before chromogenic detection and check whether DAB deposits occur in the same locations on that control (standard chromogenic IHC practice). The catalog image used a 1:200 primary overnight at 4°C and a 1:200 secondary for 45 minutes (caption A10542-1). If background persists, adjust blocking, wash stringency or antibody concentration one variable at a time (standard IHC practice). Preserve a reference section with the documented pH 9.0 retrieval so reduced background can be judged against expected cellular staining (datasheet A10542-1; HPA: cytoplasmic spermatids).
How should I score OTUB2 staining across tissue sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and compartment before scoring; cytoplasmic late spermatids provide a documented high-staining reference in testis (HPA: testis IHC). For a cell-based endpoint, report the percentage of positive cells and an H-score from 0–300, using prespecified intensity categories (standard IHC scoring practice). For spatial comparisons, report positive-cell density per mm² of evaluable tissue or the relevant compartment (standard image-analysis practice). Normalise counts to the corresponding number of eligible cells or measured viable area, and exclude folds, necrosis and section edges by a consistent rule (standard IHC practice). Keep retrieval, detection and imaging settings consistent across samples; record departures from the catalog’s pH 9.0 method (datasheet A10542-1; standard IHC practice).
How do I distinguish convincing OTUB2 signal from staining artefacts?
A convincing reference pattern is distinct cytoplasmic staining in elongated or late spermatids, which HPA rates high (HPA: testis tissue IHC). Medium staining in placental trophoblastic cells offers another reported comparison, whereas adipocytes in adipose tissue are reported as not detected (HPA: placenta and adipose tissue IHC). Check whether signal follows cell boundaries and morphology rather than tissue edges, folds or necrotic areas (standard IHC practice). Compare a no-primary control to identify endogenous-enzyme or detection-related deposits, especially before calling widespread staining positive (standard chromogenic IHC practice). Because UniProt has no subcellular localisation annotation, corroborate unexpected nuclear or membrane-dominant patterns with another method before assigning them to OTUB2 (UniProt Q96DC9: subcellular location; standard IHC practice).
Boster reagents
Best OTUB2 / Ubiquitin thioesterase OTUB2 IHC Antibodies
A10542-1 lists IHC and IF applications and human, mouse, and rat reactivity (catalog). Its IHC figure shows paraffin-embedded human tonsil (image caption).
Real IHC data
Anti-Ubiquitin thioesterase OTUB2 OTUB2 Antibody
Cat # A10542-1
A10542-1 will render with an IHC figure of paraffin-embedded human tonsil (image caption). IF is listed as an application, but no IF figure is supplied (catalog).
Which to pick: For tissue IHC, choose A10542-1: its human tonsil caption reports Tris-EDTA retrieval at pH 9.0 and primary antibody at 1:200 overnight at 4°C; the fixative is unreported (image caption). For IF, A10542-1 lists a 1:50 dilution, while ICC validation and an IF figure are unreported (catalog). For cross-species work, A10542-1 lists mouse and rat reactivity; its clone type is unreported (catalog).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q96DC9 (OTUB2_HUMAN, Ubiquitin thioesterase OTUB2).
- Human Protein Atlas. OTUB2 tissue IHC expression (reliability: Enhanced).
- Human Protein Atlas. OTUB2 subcellular location (ICC-IF): Highest expression in GAMG: 16.9 nTPM.
- Human Protein Atlas. OTUB2 antibody validation summary (2 antibodies).
- OTUB2 Regulates YAP1/TAZ to Promotes the Progression of Esophageal Squamous Cell Carcinoma. Biological procedures online 2022 — PMC9290284.
- OTUB2 Promotes Homologous Recombination Repair Through Stimulating Rad51 Expression in Endometrial Cancer. Cell transplantation 2020 — PMC7563931.
- OTUB2 promotes proliferation and metastasis of triple-negative breast cancer by deubiquitinating TRAF6. Oncology research 2025 — PMC12034018.
- Deubiquitination of RIPK2 by OTUB2 augments NOD2 signalling and protective effects in intestinal inflammation. Clinical and translational medicine 2024 — PMC11446981.
- PubMed PMID:12704427 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
- PubMed PMID:12508121 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for OTUB2 (Ubiquitin thioesterase OTUB2). Expected localisation Cytoplasmic in elongated or late spermatids (HPA tissue IHC). Antigen retrieval: Tris-EDTA pH 9.0 HIER, heat-mediated (datasheet A10542-1). Validated IHC antibody: A10542-1 at 1:100-1:300 (the product's own IHC validation image is shown). Controls (HPA): positive Testis (Elongated or late spermatids); negative Adipose tissue. IHC workflow; specimen preparation unspecified. Protocol steps: 1. Sample: Paraffin-embedded human tonsil tissue; fixative not specified (datasheet A10542-1); 2. Fixation: Image fixative and duration unreported (datasheet A10542-1); 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: Tris-EDTA pH 9.0 (datasheet A10542-1); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% normal serum of the secondary host, 30 min , room temperature (standard); 8. Primary antibody: Rabbit anti-OTUB2, 1:100-1:300 (datasheet A10542-1); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Keep fixation consistent across sections. (standard IHC practice; not target-specific); Caveat: Staining depends on the presence of late spermatids (HPA tissue IHC); Isoform / epitope: 2 isoforms; epitope differences are unspecified (UniProt); Regulation: Staining-linked regulation is unreported (UniProt). Evidence: UniProt Q96DC9, HPA tissue IHC · Enhanced, HPA cell-line RNA · Highest expression in GAMG: 16.9 nTPM, Datasheet A10542-1, PMC9290284, PMC7563931. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/OTUB2/immunohistochemistry-ihc-guide.