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PDE6A / Rod cGMP-specific 3',5'-cyclic phosphodiesterase subunit alpha · IHC design guide
Design Immunohistochemistry for PDE6A
Use this IHC-P guide to assess PDE6A staining in retinal photoreceptor rod segments (HPA tissue IHC). It covers the expected outer segment membrane location (UniProt) and paraffin-section staining with the catalog antibody (datasheet A07800-1).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
PDE6A 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 | Rod outer segment membrane expected (UniProt) | |
| Staining pattern | Strong staining in photoreceptor rod segments (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A07800-1) | |
| Positive control | Retina | |
| Negative control | Adipose tissue+4 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent across matched paraffin sections. (selected-SKU IHC image A07800-1) | |
| Caveat | Sections missing rod outer segments may lack expected signal (HPA tissue IHC) | |
| Regulation | No expression regulator annotated (UniProt) | |
| Isoform / epitope | No isoforms annotated; mature chain spans residues 2–857 (UniProt) |
Section 1
Recommended PDE6A IHC & IF Protocols
The catalog antibody has an IHC-P protocol (datasheet A07800-1). Published PDE6A IHC examples use FFPE tissue arrays (PMC3297615) and canine retinal sections (PMC3720143).
| Sample | Paraffin-embedded human rectal cancer tissue; fixative not specified (datasheet A07800-1) |
| Fixation | Image fixative and duration unreported (datasheet A07800-1); 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 A07800-1); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A07800-1) |
| Primary antibody | Rabbit anti-PDE6A, 0.5-1μg/ml (datasheet A07800-1) |
| Primary incubation | Overnight at 4 °C (datasheet A07800-1) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A07800-1) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | PDE6A-positive staining in photoreceptor cells of retina (HPA tissue IHC: High). HPA tissue profile: Expression in rods segments. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA retrieval at pH 8.0 for the catalog antibody (datasheet A07800-1).
Section 2
What Is the Expected PDE6A Staining Pattern?
PDE6A is a rod phototransduction protein associated with the photoreceptor outer segment membrane; UniProt reports no transmembrane segment (UniProt P16499 topology and function). In paraffin retina sections, expect staining in photoreceptor segments, consistent with HPA's high photoreceptor staining and rod-segment profile (HPA: Retina, High; HPA: expression in rods segments). HPA rates its tissue IHC pattern Enhanced, with external verification pending (HPA: reliability).
| Strong staining follows the photoreceptor segment layer in retina (HPA: Retina photoreceptor cells, High). | This matches HPA's rod-segment profile and UniProt's photoreceptor outer segment membrane location (HPA: tissue profile; UniProt P16499 subcellular location). Judge the distribution across the retinal layers as well as staining strength. |
| Signal is mainly nuclear or concentrated away from photoreceptor segments (HPA: tissue profile). | That distribution conflicts with the reported outer segment location (UniProt P16499 subcellular location). Check retinal orientation, counterstain and staining controls before interpreting the signal as PDE6A; intensity alone cannot establish localisation. |
| Prominent signal appears in other cell types or in an HPA negative tissue, such as adrenal glandular cells (HPA: adrenal gland, Not detected). | Investigate antibody cross-reactivity or chromogen generated by endogenous detection activity (general IHC practice). HPA's negative call applies to the specified tissue and cell type; it does not prove that every cell in every specimen must be negative. |
| Colour covers several retinal layers or the section broadly, without a defined segment pattern (HPA: tissue profile). | Diffuse staining obscures the expected rod-segment distribution (HPA: expression in rods segments). Review blocking, antibody concentration, washes and the detection-only control for background (general IHC practice). Do not score diffuse colour as a positive compartment. |
| Photoreceptor segments show no convincing signal in an intact retina section (HPA: Retina photoreceptor cells, High). | A negative result in the expected positive tissue needs technical checks before a biological conclusion (HPA: Retina photoreceptor cells, High; general IHC practice). Verify section orientation, tissue preservation, antibody performance and detection controls. |
💡Expected PDE6A appearanceCall the IHC result positive when high signal tracks retinal photoreceptor, especially rod, segments (HPA: Retina photoreceptor cells, High; HPA: rod-segment profile); diffuse colour or dominant nuclear staining is inconsistent with the reported outer segment location (UniProt P16499 subcellular location).
| Compartment and topology (UniProt P16499 subcellular location and topology) | PDE6A is associated with the photoreceptor outer segment membrane and has no transmembrane segment (UniProt P16499). Interpret a segment-associated pattern without requiring a crisp outline of each cell membrane; section geometry can affect its appearance (general IHC practice). |
| Tissue expression and validation (HPA: Retina, High; reliability Enhanced) | HPA reports high photoreceptor staining, a rod-segment profile and retina-enriched RNA (HPA: tissue IHC). Its Enhanced rating reflects staining and RNA consistency; external verification remains pending (HPA: reliability description). Use these as expectations, not a guarantee for every specimen. |
| Antibody-specific evidence (HPA: HPA016970 and HPA074677, IHC Enhanced) | Both listed rabbit polyclonal antibodies have Enhanced IHC status (HPA: antibody validation). That supports the reported tissue pattern, but does not establish that an unspecified catalog antibody shares their performance or that either has ICC-IF validation. |
| Protein processing (UniProt P16499 processing and modified residues) | UniProt lists a chain spanning residues 2–857, a short C-terminal propeptide and modified residues at positions 2 and 857 (UniProt P16499). Those annotations alone cannot predict epitope access or antigen retrieval needs without the antibody's epitope information. |
| Situation | Likely cause | Next action |
|---|---|---|
| Retinal photoreceptor segments are unstained despite an intact expected positive area (HPA: Retina, High). | Antibody, retrieval or detection conditions may have failed; the supplied sources do not establish PDE6A-specific fixation sensitivity (general IHC practice; HPA/UniProt scope). | Check the catalog antibody's IHC-P instructions, reagent performance, section orientation and a known positive control. Adjust retrieval only as a general IHC optimisation, then compare the segment pattern (general IHC practice; HPA: tissue profile). |
| Strong nuclear or unrelated-layer staining dominates the retina section (UniProt P16499 subcellular location). | The distribution is inconsistent with the reported outer segment location; nonspecific binding or misread anatomy may explain it (UniProt P16499; general IHC practice). | Use the counterstain to identify retinal layers, compare an adjacent section and review antibody concentration and controls before assigning PDE6A positivity (general IHC practice; HPA: rod-segment profile). |
| Adrenal glandular cells stain strongly (HPA: adrenal gland glandular cells, Not detected). | This conflicts with HPA's observed negative pattern and warrants investigation of cross-reactivity or detection background (HPA: adrenal gland; general IHC practice). | Check an antibody-omission control and the detection chemistry. If the method uses peroxidase, assess endogenous peroxidase blocking (general IHC practice); retain HPA's cell-specific negative call when comparing sections. |
| A broad haze makes photoreceptor segments hard to distinguish (HPA: rod-segment profile). | Excess antibody or insufficient blocking or washing can raise background in chromogenic IHC (general IHC practice). | Review the catalog IHC-P dilution and incubation guidance, then optimise blocking and washes with controls (general IHC practice). Score only a resolved segment pattern against HPA's expected distribution (HPA: tissue profile). |
| The chromogen obscures the boundary between photoreceptor segments and neighbouring layers (HPA: rod-segment profile). | Overdevelopment or an overly dark counterstain can limit localisation assessment (general IHC practice). | Review development time and counterstain intensity, then reassess the segment layer with the same anatomical landmarks across sections (general IHC practice; HPA: expression in rods segments). |
| Can an IF/ICC pattern establish the expected PDE6A location? | HPA provides no main ICC-IF location or cell-line images, and lists no ICC validation for the two antibodies (HPA: subcellular record; HPA: antibody validation). | Use the outer segment location as a biological expectation, not as evidence of an established ICC-IF staining pattern (UniProt P16499 subcellular location; HPA: subcellular record). Consult the separate IF/ICC guide for that application. |
Experiment evidence
IHC & IF images showing PDE6A staining
A07800-1 · IHCIHC analysis of PDE6 alpha/PDE6A using anti-PDE6 alpha/PDE6A antibody (A07800-1). PDE6 alpha/PDE6A was detected in paraffin-embedded section
A07800-1 · IHCIHC analysis of PDE6 alpha/PDE6A using anti-PDE6 alpha/PDE6A antibody (A07800-1). PDE6 alpha/PDE6A was detected in paraffin-embedded section
A07800-1 · IFIF analysis of PDE6 alpha/PDE6A using anti-PDE6 alpha/PDE6A antibody (A07800-1). PDE6 alpha/PDE6A was detected in immunocytochemical section
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000132915-PDE6A/tissue/cerebral+cortex#imid_20423723
HPA · RetinaHuman Protein Atlas IHC, Retina. Source: https://www.proteinatlas.org/ENSG00000132915-PDE6A/tissue/retina#imid_1016
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000132915-PDE6A/tissue/colon#imid_20423633
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000132915-PDE6A/tissue/liver#imid_20423642
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for PDE6A IHC & IF
🧪Run retina first: photoreceptor cells should stain strongly (HPA: High in retinal photoreceptor cells). Use adipose tissue adipocytes as a negative comparator (HPA: Not detected in adipocytes); on the retinal slide, use non-photoreceptor cells as background comparators without assuming they are proven PDE6A-negative (HPA: High reported specifically in photoreceptor cells).
Positive control tissue: Retina (Photoreceptor cells, 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 PDE6A; derive a cell-line control from the positive tissue's cell type (Photoreceptor cells) and confirm it by RNA or western blot first.
Technical controls: Include a no-primary, secondary-only control, a concentration-matched rabbit isotype control, and a PDE6A knockout sample if available (caption: rabbit primary antibody; standard IHC control practice). For retinal IHC, quench endogenous peroxidase, check for endogenous biotin when using the reported biotinylated secondary and SABC system, and distinguish tissue pigment from DAB signal (caption: biotinylated secondary, SABC and DAB; standard IHC practice).
⚠️Feasibility: The selected A07800-1 paraffin-section caption does not report a fixative, and the supplied evidence reports no PDE6A-specific fixation window or fixation effect (caption: fixative unreported). Heat-mediated EDTA retrieval at pH 8.0 was used in that caption, but its necessity for retinal sections is unreported (caption: EDTA pH 8.0 retrieval). The evidence does not establish whether frozen sections or IF are easier; when assessing retinal IHC, distinguish outer-segment signal from tissue pigment (UniProt P16499: photoreceptor outer segment membrane; standard IHC practice).
HPA tissue IHC evidence for PDE6A
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 |
|---|---|---|---|---|
| Retina | Photoreceptor cells | 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 | Endocrine 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 PDE6A IHC Tips
Troubleshoot PDE6A staining in paraffin section IHC using the catalog antibody’s documented workflow and retinal rod localisation as reference points.
What retrieval should I try first for PDE6A in paraffin sections?
Start with heat mediated antigen retrieval in EDTA at pH 8.0 (datasheet A07800-1). Apply the same retrieval consistently to comparison sections, then use the documented 1 μg/mL primary incubation overnight at 4°C as a starting condition (datasheet A07800-1). If staining is weak, adjust heating duration in a small pilot while keeping the EDTA buffer and detection conditions fixed; record tissue damage alongside signal (standard IHC practice). Judge improvement by staining in photoreceptor segments of a retina control, rather than by stronger staining throughout the section (HPA: expression in rod segments; HPA: high in retinal photoreceptor cells).
How can I assess whether fixation is limiting PDE6A staining?
The selected product caption describes a paraffin section but does not state its fixative, so target specific fixation sensitivity is unknown (datasheet A07800-1: fixative not stated). Record each specimen’s fixative and time in fixative, and compare similarly processed sections before changing antibody concentration or retrieval (standard IHC practice). Use EDTA retrieval at pH 8.0 and the documented 1 μg/mL primary condition across that comparison (datasheet A07800-1). If a poorly staining block improves after retrieval adjustment, report the change as an observed result for that block; neither retinal expression nor PDE6A membrane association establishes a fixation mechanism (HPA: retinal rod segment expression; UniProt P16499: outer segment membrane).
Where should convincing PDE6A staining appear in retinal IHC?
Look for signal in rod photoreceptor outer segments, matching the reported membrane localisation and tissue staining profile (UniProt P16499: photoreceptor outer segment membrane; HPA: expression in rod segments). Evaluate segment staining against the retinal cell layers on the same section and document whether the outer segments remain intact (standard IHC practice). PDE6A has no annotated transmembrane segment, so a membrane associated pattern need not appear as a continuous cell outline (UniProt P16499: topology, no transmembrane segment). Broad nuclear or uniform stromal staining should trigger review of morphology, controls and detection background before it is assigned to PDE6A (UniProt P16499: outer segment membrane; standard IHC practice).
Could isoforms or epitope changes explain unexpected PDE6A staining?
The supplied record lists 0 isoforms, so an isoform specific explanation is unsupported by this record (UniProt P16499: isoforms). PDE6A contains GAF domains at residues 57–223 and 234–433, plus a PDEase domain at 483–816; epitope location would matter if antibody mapping becomes available (UniProt P16499: domains). The record also notes N acetylglycine at residue 2 and a cysteine methyl ester at 857, but it does not show that either modification alters this antibody’s staining (UniProt P16499: modified residues). Compare retrieval and controls before assigning an unexpected pattern to epitope masking, and request the antibody’s epitope information if that distinction becomes necessary (standard IHC practice).
How should I investigate a matching PDE6A pattern by immunofluorescence?
Use IF as a separate validation experiment: the selected antibody evidence describes chromogenic paraffin section IHC, with no IF image or IF protocol supplied here (datasheet A07800-1; HPA subcellular: no ICC/IF images). Multiplex PDE6A with a validated rod photoreceptor marker and check whether signals align in outer segments, the expected location in tissue (HPA: expression in rod segments; UniProt P16499: outer segment membrane). Choose a fluorophore channel after measuring retinal autofluorescence on an unstained section, and include single stain controls when combining channels (standard IF practice). Because PDE6A has no annotated transmembrane segment, optimise permeabilisation for antibody access to its membrane associated epitope once that epitope’s orientation is known (UniProt P16499: topology and localisation; standard IF practice).
What should I check when PDE6A DAB staining is widespread?
Start by comparing a no primary control with the stained section, then inspect tissue edges, damaged areas and pigment for signal that does not track intact cells (standard chromogenic IHC practice). Include a peroxidase blocking step and check the DAB development endpoint, since the documented workflow uses a biotinylated secondary, streptavidin biotin complex and DAB (datasheet A07800-1; standard IHC practice: peroxidase block). The caption used 10% goat serum blocking and 1 μg/mL primary antibody overnight at 4°C, which provide conditions to reproduce during troubleshooting (datasheet A07800-1). Prioritise anatomically restricted rod segment staining over diffuse colour intensity when judging specificity (HPA: expression in rod segments).
How should I score PDE6A staining across retinal sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the region of interest as preserved photoreceptor outer segments and score it consistently across sections, matching the reported PDE6A location (HPA: expression in rod segments; UniProt P16499: outer segment membrane). For a cell based analysis, record the percentage of positive photoreceptors and an intensity weighted H score; for segment focused analysis, measure positive DAB area or optical density per mm² of evaluable outer segment region (standard IHC quantification practice). Normalise to the measured segment area or the number of evaluable photoreceptors, and record missing or detached segments separately (standard IHC quantification practice). Keep retrieval, imaging and DAB development conditions matched before comparing scores (standard chromogenic IHC practice).
How can I distinguish a true PDE6A positive from an artefact?
A convincing retinal positive follows intact rod segments, consistent with the reported cell type and outer segment membrane localisation (HPA: high in retinal photoreceptor cells and expression in rod segments; UniProt P16499: localisation). Check whether apparent positives instead concentrate in nuclei, unrelated cells, section edges or necrotic areas, and compare them with a no primary control (UniProt P16499: localisation; standard IHC practice). If colour persists without primary antibody, investigate endogenous peroxidase activity, biotin related detection background and DAB deposition before scoring it as PDE6A (datasheet A07800-1: biotin and DAB detection; standard IHC practice). The product caption reports staining in human rectal cancer tissue, but that image alone does not establish rod specific localisation there (datasheet A07800-1; HPA: retina enriched RNA).
Boster reagents
Best PDE6A / Rod cGMP-specific 3',5'-cyclic phosphodiesterase subunit alpha IHC Antibodies
A07800-1 has IHC images from human rectal cancer and rat retina paraffin sections, plus an IF image from CACO-2 cells (catalog image captions).
Real IHC data
Anti-PDE6 alpha/PDE6A Antibody ®
Cat # A07800-1
A07800-1 has IHC images from human rectal cancer and rat retina paraffin sections (catalog IHC captions). The same SKU has an IF image from CACO-2 cells and lists human, mouse and rat reactivity (catalog IF caption; catalog reactivity).
Which to pick: For tissue IHC, choose A07800-1: its paraffin-section images use 1 μg/ml antibody after heat retrieval in EDTA at pH 8.0; the fixative is unreported (catalog IHC captions). For IF/ICC, A07800-1 also has a CACO-2 cell image at 4 μg/ml (catalog IF caption). For cross-species work, A07800-1 lists human, mouse and rat reactivity, with IHC images supplied for human and rat (catalog reactivity; catalog IHC captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry P16499 (PDE6A_HUMAN, Rod cGMP-specific 3',5'-cyclic phosphodiesterase subunit alpha).
- Human Protein Atlas. PDE6A tissue IHC expression (reliability: Enhanced).
- Human Protein Atlas. PDE6A subcellular location (ICC-IF): Highest expression in CACO-2: 1.4 nTPM.
- Human Protein Atlas. PDE6A antibody validation summary (2 antibodies).
- Scalable in situ hybridization on tissue arrays for validation of novel cancer and tissue-specific biomarkers. PloS one 2012 — PMC3297615.
- Elevated retinal cGMP is not associated with elevated circulating cGMP levels in a canine model of retinitis pigmentosa. PloS one 2022 — PMC9803105.
- Characterization of a canine model of autosomal recessive retinitis pigmentosa due to a PDE6A mutation. Investigative ophthalmology & visual science 2009 — PMC3720143.
- Gene Therapy in a Large Animal Model of PDE6A-Retinitis Pigmentosa. Frontiers in neuroscience 2017 — PMC5476745.
- PubMed PMID:2155175 — UniProt-cited evidence.
- PubMed PMID:15489334 — UniProt-cited evidence.
- PubMed PMID:20940301 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for PDE6A (Rod cGMP-specific 3',5'-cyclic phosphodiesterase subunit alpha). Expected localisation Rod outer segment membrane expected (UniProt). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A07800-1). Validated IHC antibody: A07800-1 at 0.5-1μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Retina (Photoreceptor cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human rectal cancer tissue; fixative not specified (datasheet A07800-1); 2. Fixation: Image fixative and duration unreported (datasheet A07800-1); 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 A07800-1); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A07800-1); 8. Primary antibody: Rabbit anti-PDE6A, 0.5-1μg/ml (datasheet A07800-1); 9. Primary incubation: Overnight at 4 °C (datasheet A07800-1). Watch for: Fixation: Keep fixation consistent across matched paraffin sections. (selected-SKU IHC image A07800-1); Caveat: Sections missing rod outer segments may lack expected signal (HPA tissue IHC); Isoform / epitope: No isoforms annotated; mature chain spans residues 2–857 (UniProt); Regulation: No expression regulator annotated (UniProt). Evidence: UniProt P16499, HPA tissue IHC · Enhanced, HPA cell-line RNA · Highest expression in CACO-2: 1.4 nTPM, Datasheet A07800-1, PMC3297615, PMC3720143. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/PDE6A/immunohistochemistry-ihc-guide.