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SPATA3 / Spermatogenesis-associated protein 3 · IHC design guide
Design Immunohistochemistry for SPATA3
Plan SPATA3 IHC-P with testis as a positive control and assess cytoplasmic staining in elongated or late spermatids (HPA tissue IHC). Use consistent fixation, then compare staining with a negative control when scoring sections (standard IHC practice).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
SPATA3 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 spermatozoa (HPA tissue IHC) | |
| Staining pattern | High cytoplasmic staining in late spermatids (HPA tissue IHC) | |
| Antigen retrieval | Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen) | |
| Positive control | Testis | |
| 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 | Sections lacking late spermatids may appear negative (HPA tissue IHC) | |
| Regulation | Testis-enriched RNA expression (HPA tissue RNA) | |
| Isoform / epitope | No annotated isoforms or processing (UniProt) |
Section 1
Recommended SPATA3 IHC & IF Protocols
The catalog antibody’s IHC-P protocol (datasheet) is accompanied by a published mouse testis protocol (PMC12284469).
| Sample | Tissue sections; selected-image fixative not specified (standard IHC workflow) |
| Fixation | Image fixative and duration unreported (datasheet A16295); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat-induced epitope retrieval in citrate buffer, pH 6.0, 20 min at 95–98 °C (standard rule: cytoplasmic / membrane antigen) |
| 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-SPATA3, 2.5 μg/mL (datasheet A16295) |
| 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 | SPATA3-positive staining in elongated or late spermatids of testis (HPA tissue IHC: High). HPA tissue profile: Selective cytoplasmic expression in spermatozoa. No signal in the no-primary control. |
💡Decision noteStart with citrate pH 6.0 HIER at 95–98 °C for 20 min (page retrieval); the published protocol used 97 °C for 12 min (PMC12284469).
Section 2
What Is the Expected SPATA3 Staining Pattern?
SPATA3 is associated with cell projections, cilia and flagella and has no annotated transmembrane segment (UniProt Q8NHX4). In paraffin testis sections, expect selective cytoplasmic staining of spermatozoa, with high staining in elongated or late spermatids (HPA tissue IHC). HPA rates the tissue staining “Enhanced,” citing consistency with RNA expression (HPA tissue IHC). This supports a testis focused IHC pattern without establishing finer localization within each sperm cell.
| Strong cytoplasmic staining in elongated or late spermatids, with little staining in surrounding cells. | This matches the reported testis pattern: elongated or late spermatids are high, and expression is selective in spermatozoa (HPA tissue IHC). Assess the cell type as well as signal strength. |
| Predominantly nuclear staining in the expected positive cells. | A nuclear dominant pattern differs from HPA’s cytoplasmic tissue staining and UniProt’s cell projection annotation (HPA tissue IHC; UniProt Q8NHX4). Check the counterstain and whether chromogen lies within nuclei before treating it as SPATA3. |
| Strong staining in unrelated cells, including adipocytes in an adipose tissue control. | HPA reports SPATA3 as not detected in adipocytes (HPA tissue IHC). Unexpected staining raises concern for cross reactivity or endogenous detection activity; cell identity and control results determine which explanation fits. |
| Haze across cells, connective tissue or section edges, without a selective spermatid pattern. | This is diffuse background rather than the reported selective cytoplasmic signal (HPA tissue IHC). Review staining in the negative control and the detection system before assigning a positive cell population (standard IHC practice). |
| No staining in a testis section containing elongated or late spermatids. | This conflicts with HPA’s high signal in those cells (HPA tissue IHC). Confirm that the expected cell population is present, then review antibody performance and the IHC workflow before interpreting other sections as negative. |
💡Expected SPATA3 appearanceCall an IHC result positive when elongated or late spermatids show high, selective cytoplasmic staining (HPA tissue IHC); nuclear dominant signal or comparable staining in HPA reported negative cells calls for control review before attribution to SPATA3.
| Choice of positive and negative tissue | Testis with elongated or late spermatids is the supported positive comparator; adipocytes and adrenal glandular cells are reported as not detected (HPA tissue IHC). Match interpretation to the named cell populations, not merely the organ. |
| Cellular compartment | HPA describes cytoplasmic staining in spermatozoa (HPA tissue IHC). UniProt places SPATA3 at cell projections, cilia and flagella, with no annotated transmembrane segment (UniProt Q8NHX4); neither record establishes a precise chromogenic pattern along a flagellum. |
| Strength of tissue evidence | HPA marks the tissue staining Enhanced and describes consistency between staining and RNA expression (HPA tissue IHC). That supports the reported distribution, but does not validate every unexpected cell or compartment as SPATA3 positive. |
| ICC/IF localization boundary | The HPA subcellular summary says “Membrane,” yet provides no main location or ICC/IF image bearing cell line (HPA subcellular). It does not replace the cytoplasmic testis IHC observation or establish an IF staining pattern. |
| Retrieval and epitope information | No SPATA3 specific retrieval condition or epitope location is supplied (UniProt Q8NHX4; HPA tissue IHC). If signal is absent, compare documented IHC conditions and controls; do not infer SPATA3 specific fixation sensitivity from these records. |
| Situation | Likely cause | Next action |
|---|---|---|
| The testis positive control is blank. | The section may lack identifiable elongated or late spermatids, or an IHC step may have failed; those cells are high in HPA tissue IHC. | Verify the cell population on morphology, then check reagent activity, antigen retrieval and detection against the established IHC run controls (standard IHC practice). |
| Spermatids stain, but nuclei dominate the signal. | The compartment disagrees with HPA’s selective cytoplasmic staining in spermatozoa (HPA tissue IHC). | Compare chromogen with the nuclear counterstain and review the negative control; adjust detection conditions if nonspecific nuclear color persists (standard IHC practice). |
| Adipocytes or adrenal glandular cells stain strongly. | Both cell populations are reported as not detected (HPA tissue IHC); cross reactivity or endogenous detection activity may contribute. | Check cell identification, a no primary control and the detection blocking steps before calling these cells SPATA3 positive (standard IHC practice). |
| Brown signal spreads across most of the section. | A broad signal does not match selective spermatozoal staining (HPA tissue IHC); background can arise from the detection workflow (standard IHC practice). | Review the no primary control, blocking, washes and chromogen development, then judge whether a selective spermatid signal remains (standard IHC practice). |
| Only a membrane outline is visible in testis IHC. | HPA’s ICC/IF summary says “Membrane,” but its tissue IHC description is cytoplasmic and the subcellular entry lacks image bearing cell lines (HPA subcellular; HPA tissue IHC). | Score the paraffin section against the reported tissue cell type and cytoplasmic pattern; do not use the ICC/IF summary alone to accept the outline. |
| The researcher wants an IF pattern from this IHC result. | HPA supplies a tissue IHC pattern and a membrane subcellular summary, but no ICC/IF image bearing cell line (HPA tissue IHC; HPA subcellular). | Use the separate IF/ICC guide for that application; treat a proposed IF compartment as unconfirmed by the supplied images and verify it with appropriate controls. |
Experiment evidence
IHC & IF images showing SPATA3 staining
A16295 · IHCImmunohistochemistry of SPATA3 in mouse testis tissue with SPATA3 antibody at 2.5 μg/mL.
A16295 · IFImmunofluorescence of SPATA3 in mouse testis tissue with SPATA3 antibody at 20 μg/mL.
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000173699-SPATA3/tissue/cerebral+cortex#imid_4758968
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000173699-SPATA3/tissue/colon#imid_4758886
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000173699-SPATA3/tissue/liver#imid_4758887
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000173699-SPATA3/tissue/kidney#imid_4758896
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for SPATA3 IHC & IF
🧪Run testis first: elongated or late spermatids must stain (HPA: High in elongated or late spermatids). Use adipose tissue as a negative comparator (HPA: Not detected in adipocytes); other cell types on the testis slide should lack specific staining relative to the spermatids (HPA: High in elongated or late spermatids).
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 SPATA3; 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; use host- and isotype-matched control IgG for a monoclonal primary or host-matched nonimmune IgG for a polyclonal primary. If available, confirm specificity with SPATA3 knockout tissue or competition with the antibody’s immunizing peptide; quench endogenous peroxidase for chromogenic IHC and check testis autofluorescence if using IF.
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected mouse-testis IHC caption does not state a fixative (A16295 caption: fixative not stated). Antigen-retrieval dependency is unreported; optimize retrieval on the testis positive control (HPA: High in elongated or late spermatids). The supplied evidence does not establish whether frozen sections or IF are easier; no cell-line ICC-IF images are listed (HPA subcellular: no ICC-IF cell lines), so assess testis autofluorescence before interpreting any IF signal.
HPA tissue IHC evidence for SPATA3
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — High 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 |
|---|---|---|---|---|
| Testis | Elongated or late spermatids | High | 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 → |
| 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 SPATA3 IHC Tips
Troubleshoot SPATA3 chromogenic IHC by checking retrieval, cell identity and subcellular pattern against the reported testis staining (HPA tissue IHC).
How should I retrieve SPATA3 in paraffin sections when staining is weak?
Start with citrate buffer at pH 6.0, heated to 95–98 °C for 20 min (page retrieval setting). Allow sections to cool in buffer, then keep antibody concentration, incubation and detection conditions constant while comparing retrieval results (standard IHC practice). If staining remains weak, test a shorter and a longer heating interval on adjacent sections before changing buffer chemistry (standard IHC practice). Score signal specifically in elongated or late spermatids, where staining is high, rather than judging the whole testis section by average colour (HPA tissue IHC). Record any increase in diffuse background alongside signal gain (standard IHC practice).
Could fixation explain absent SPATA3 staining in my paraffin sections?
The mouse testis image reports SPATA3 staining at 2.5 µg/mL, but its caption does not state a fixative (A16295 tissue-IHC caption). Target-specific sensitivity to fixation is therefore unknown; do not assign a particular fixation effect to SPATA3 from the available evidence (A16295 tissue-IHC caption). Check the specimen's recorded fixative and fixation duration, then compare consistently processed sections while holding retrieval and detection conditions fixed (standard IHC practice). Include a testis section with identifiable elongated or late spermatids as a positive comparator (HPA tissue IHC). Inspect section preservation before attributing a weak result to antigen loss (standard IHC practice).
Which SPATA3 staining pattern should I accept as specific?
Prioritise staining in elongated or late spermatids; the tissue profile describes selective cytoplasmic expression in spermatozoa (HPA tissue IHC). SPATA3 is annotated to cell projections, cilia and flagella, with no transmembrane segment annotated (UniProt Q8NHX4). Use morphology and a counterstain to distinguish signal associated with these cells from colour over neighbouring structures (standard IHC practice). A sharply outlined plasma membrane pattern throughout unrelated cells would require independent validation before being assigned to SPATA3 (UniProt Q8NHX4; HPA tissue IHC). Compare the pattern across intact tubules and adjacent sections, since a single strongly coloured region cannot establish cellular localisation (standard IHC practice).
How do I troubleshoot an epitope that appears inaccessible after retrieval?
SPATA3 has one annotated chain spanning residues 1–192, with no annotated isoforms or transmembrane segment (UniProt Q8NHX4). Its record lists 0 glycosylation sites and 0 modified residues, so these annotations do not identify a modified epitope to target with retrieval changes (UniProt Q8NHX4). Check the antibody's stated immunogen or epitope, if available, before assigning a failed stain to epitope masking (standard IHC practice). Compare a small retrieval series on adjacent testis sections and keep detection conditions identical (standard IHC practice). If the epitope remains unspecified, report that limitation when interpreting either negative staining or altered subcellular distribution (standard IHC practice).
How can I investigate SPATA3 localisation with a complementary IF experiment?
Treat IF as a separate assay requiring its own antibody validation; the supplied product evidence is a tissue-IHC caption (A16295 tissue-IHC caption). In a multiplex experiment, pair SPATA3 with a validated marker identifying elongated or late spermatids, the strongly stained population in tissue IHC (HPA tissue IHC; standard IF practice). Measure unstained-tissue autofluorescence and choose a fluorophore channel with clear separation from that background (standard IF practice). Because SPATA3 has no annotated transmembrane segment, do not assume an extracellular epitope; permeabilise when testing access to an intracellular epitope (UniProt Q8NHX4; standard IF practice). Include single-label controls to assess channel bleed-through (standard IF practice).
What should I check when chromogenic background obscures spermatid staining?
Compare a no-primary control with the stained section to separate detection background from antibody-dependent colour (standard IHC practice). Quench endogenous peroxidase for peroxidase-based detection, optimise blocking, and limit DAB development so faint background does not become visually dominant (standard IHC practice). Titrate the antibody around the documented 2.5 µg/mL image condition only as an experimental comparison, since the caption reports that concentration without establishing an optimum for other samples (A16295 tissue-IHC caption; standard IHC practice). Inspect section edges, folds and damaged areas separately from intact tubules (standard IHC practice). Judge improvement by preserved staining in elongated or late spermatids (HPA tissue IHC).
How should I quantify SPATA3 staining across testis sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define elongated or late spermatids as the scoring population before examining experimental groups; they show high staining in the reference tissue profile (HPA tissue IHC). Record the percentage of positive cells or an H-score from intensity categories, using identical thresholds and DAB development conditions across sections (standard IHC practice). Normalise positive counts to the number of eligible spermatids, or stained area to the measured eligible compartment, rather than total section area (standard IHC practice). Sample comparable tubules and document how damaged or missing regions were excluded (standard IHC practice). Report both the denominator and section count so changes in cell abundance remain distinguishable from changes in staining intensity (standard IHC practice).
How can I distinguish true SPATA3 signal from staining artefacts?
A credible result should recur in elongated or late spermatids, the population with high testis staining in the reference profile (HPA tissue IHC). Check whether the signal fits selective cytoplasmic expression in spermatozoa and the annotated association with cilia and flagella (HPA tissue IHC; UniProt Q8NHX4). Treat dominant nuclear colour, broad staining in unrelated cells, or colour concentrated at section edges and necrotic areas as findings requiring further controls (HPA tissue IHC; standard IHC practice). Use a no-primary control and an endogenous-peroxidase block to investigate enzyme-derived DAB signal (standard IHC practice). Confirm the pattern in intact regions on independently stained sections (standard IHC practice).
Boster reagents
Best SPATA3 / Spermatogenesis-associated protein 3 IHC Antibodies
A16295 is an anti-SPATA3 antibody for IHC-P and IF (catalog: applications), with mouse testis images for both assays (IHC and IF image captions). Human and mouse reactivity is listed (catalog: reactivity).
Real IHC data
Anti-SPATA3 Antibody
Cat # A16295
A16295 will render with an IHC image of mouse testis at 2.5 μg/mL (IHC image caption). It also has an IF image of mouse testis at 20 μg/mL (IF image caption); human and mouse reactivity is listed (catalog: reactivity).
Which to pick: For paraffin-section IHC, choose A16295: IHC-P is listed (catalog: applications), and its own IHC image shows mouse testis at 2.5 μg/mL (IHC image caption); the fixative is unreported (IHC image caption). For IF, A16295 has a mouse testis image at 20 μg/mL (IF image caption); ICC validation and clonality are unreported (catalog: applications and clone). For work across human and mouse samples, A16295 lists both species (catalog: reactivity), while the supplied IHC and IF images show mouse tissue only (IHC and IF image captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q8NHX4 (SPTA3_HUMAN, Spermatogenesis-associated protein 3).
- Human Protein Atlas. SPATA3 tissue IHC expression (reliability: Enhanced).
- Human Protein Atlas. SPATA3 subcellular location (ICC-IF): Membrane.
- Human Protein Atlas. SPATA3 antibody validation summary (1 antibodies).
- Roles of human SPATA3 in cell proliferation and expression pattern of Spata3 in mouse testis. Molecular medicine reports 2025 — PMC12284469.
- PubMed PMID:12812072 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
- PubMed PMID:15815621 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for SPATA3 (Spermatogenesis-associated protein 3). Expected localisation Cytoplasmic in spermatozoa (HPA tissue IHC). Antigen retrieval: Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen). Validated IHC antibody: A16295 at 2.5 μg/mL (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: Tissue sections; selected-image fixative not specified (standard IHC workflow); 2. Fixation: Image fixative and duration unreported (datasheet A16295); 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-induced epitope retrieval in citrate buffer, pH 6.0 , 20 min at 95–98 °C…; 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-SPATA3, 2.5 μg/mL (datasheet A16295); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Keep fixation consistent across sections. (standard IHC practice; not target-specific); Caveat: Sections lacking late spermatids may appear negative (HPA tissue IHC); Isoform / epitope: No annotated isoforms or processing (UniProt); Regulation: Testis-enriched RNA expression (HPA tissue RNA). Evidence: UniProt Q8NHX4, HPA tissue IHC · Enhanced, HPA ICC-IF · Membrane, Datasheet A16295, PMC12284469. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/SPATA3/immunohistochemistry-ihc-guide.