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SACS / Sacsin · IHC design guide
Design Immunohistochemistry for SACS
Plan chromogenic SACS IHC on paraffin sections using cytoplasmic staining as the expected tissue readout (HPA tissue IHC). Epididymal glandular cells show high staining, but interpret intensity cautiously because antibody staining and RNA expression have low consistency (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
SACS 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 tissue staining (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic staining in several tissue cell types (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A00519) | |
| Positive control | Epididymis+4 more · see all | |
| Negative control | Adipose tissue+2 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent between sections (standard IHC practice; not target-specific); Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image A00519) | |
| Caveat | Staining has low consistency with tissue RNA (HPA tissue IHC) | |
| Regulation | No specific expression regulator is reported (UniProt) | |
| Isoform / epitope | 2 isoforms; intracellular epitope differences unknown (UniProt) |
Section 1
Recommended SACS IHC & IF Protocols
The catalog antibody’s IHC-P protocol uses heat-mediated EDTA retrieval (datasheet A00519). One published sacsin IHC method examines rat brain sections (PMC2667285 methods).
| Sample | Paraffin-embedded human lung cancer tissue; fixative not specified (datasheet A00519) |
| Fixation | Image fixative and duration unreported (datasheet A00519); 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 A00519); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A00519) |
| Primary antibody | Rabbit anti-SACS, 2-5μg/ml (datasheet A00519) |
| Primary incubation | Overnight at 4 °C (datasheet A00519) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet A00519) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | SACS-positive staining in glandular cells of epididymis (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in several tissues. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA pH 8.0 retrieval for paraffin sections (datasheet A00519); the rat brain IHC excerpt does not specify retrieval (PMC2667285 methods).
Section 2
What Is the Expected SACS Staining Pattern?
SACS is predominantly cytoplasmic, with a small nuclear portion and partial overlap with the mitochondrial marker Hsp60 (UniProt Q9NZJ4 localization). In tissue sections, HPA reports high staining in epididymal and parathyroid glandular cells and placental trophoblastic cells (HPA tissue IHC). Treat these as candidate positive patterns: HPA rates its tissue IHC evidence Uncertain because antibody staining has low consistency with RNA data (HPA tissue IHC). SACS has no transmembrane segment (UniProt Q9NZJ4 topology).
| Cytoplasmic chromogen in glandular cells of epididymis or parathyroid gland, or in placental trophoblastic cells (HPA tissue IHC). | This matches the reported cell types and their High HPA staining levels (HPA tissue IHC). Check whether signal is cell associated and reproducible before calling it SACS: HPA rates tissue IHC reliability Uncertain (HPA tissue IHC; standard IHC practice). |
| Strong, sharply membranous staining or staining confined to nuclei across the section. | A membrane dominant pattern conflicts with the absence of a transmembrane segment and the predominantly cytoplasmic localization (UniProt Q9NZJ4 topology and localization). Exclusively nuclear signal also needs review, although a small nuclear SACS portion is reported (UniProt Q9NZJ4 localization). Check morphology and controls for artefact (standard IHC practice). |
| Signal mainly in a cell type reported as unstained, such as adipocytes, cervical glandular cells, or vaginal squamous cells (HPA tissue IHC). | HPA lists these specific cell types as Not detected (HPA tissue IHC). Unexpected chromogen can reflect cross-reactivity or endogenous detection activity; compare a reagent control and the expected cellular pattern before interpreting it as SACS (standard IHC practice). |
| Uniform colour over cells, stroma, and empty spaces, without a distinct cytoplasmic pattern. | Diffuse colour lacks the cell associated cytoplasmic distribution expected from the UniProt localization and HPA tissue observations (UniProt Q9NZJ4 localization; HPA tissue IHC). Review blocking, washing, and chromogen development with a reagent control (standard IHC practice). |
| No convincing staining in an epididymis, parathyroid gland, or placenta section selected for its HPA High pattern (HPA tissue IHC). | First check tissue preservation, target cell identification, retrieval, antibody dilution, and detection controls (standard IHC practice). A negative result does not alone establish absent SACS: these are HPA observed patterns, and the tissue IHC reliability is Uncertain (HPA tissue IHC). |
💡Expected SACS appearanceCall a candidate positive result when discernible cytoplasmic staining occurs in the HPA reported glandular or trophoblastic cells at its High level; dominant membrane staining, exclusively nuclear staining, or diffuse colour warrants review (HPA tissue IHC; UniProt Q9NZJ4 localization and topology; standard IHC practice).
| Tissue selection and validation | Epididymal and parathyroid glandular cells and placental trophoblastic cells are reported High, while selected other cell types are Not detected (HPA tissue IHC). Use these as comparison patterns, with HPA's Uncertain reliability stated alongside any result (HPA tissue IHC). |
| Compartment and topology | Predominantly cytoplasmic SACS has a small nuclear portion and partial Hsp60 overlap; it has no transmembrane segment (UniProt Q9NZJ4 localization and topology). Score the dominant pattern without treating every nuclear or mitochondrial adjacent pixel as artefact. |
| Antibody evidence | The listed antibody, CAB017714, has Uncertain IHC validation status (HPA antibodies). Agreement with its reported tissue pattern can guide interpretation, but antibody specific signal requires appropriate controls and cautious scoring (HPA antibodies; standard IHC practice). |
| Isoforms and epitope | UniProt lists 2 SACS isoforms (UniProt Q9NZJ4 isoforms). The supplied evidence gives no antibody epitope or isoform recognition, so an isoform specific staining prediction cannot be made from this record. |
| Situation | Likely cause | Next action |
|---|---|---|
| Candidate positive tissue is blank. | The assay may have missed detectable signal, or the sampled cells may differ from HPA's reported High cell types (standard IHC practice; HPA tissue IHC). | Confirm the relevant cell type and tissue quality; review retrieval, dilution, and detection controls using the assay's instructions (standard IHC practice). Keep HPA's Uncertain reliability in the interpretation (HPA tissue IHC). |
| Nuclei dominate the stain. | A small nuclear SACS portion is reported, but predominantly cytoplasmic localization does not predict an exclusively nuclear pattern (UniProt Q9NZJ4 localization). | Compare nuclear and cytoplasmic signal within the same cells, then assess reagent controls and morphology before scoring (standard IHC practice). |
| Cell borders show a strong continuous signal. | A dominant membrane pattern is inconsistent with UniProt's cytoplasmic localization and lack of a transmembrane segment (UniProt Q9NZJ4 localization and topology). | Review whether the colour follows true cell boundaries, then check detection controls and antibody specificity before calling it positive (standard IHC practice). |
| Adipocytes or other HPA Not detected cells stain strongly (HPA tissue IHC). | Cross-reactivity or endogenous detection activity is possible (standard IHC practice); HPA reports adipocytes as Not detected (HPA tissue IHC). | Compare an appropriate reagent control and the expected cell pattern; qualify any discordant result given HPA's Uncertain reliability (standard IHC practice; HPA tissue IHC). |
| Colour is widespread and obscures cell boundaries. | Excess background from blocking, washing, or detection conditions can obscure a cytoplasmic pattern (standard IHC practice; UniProt Q9NZJ4 localization). | Inspect reagent controls, blocking and wash steps, and chromogen development; rescore only where cellular boundaries remain interpretable (standard IHC practice). |
| Can this IHC result predict the IF/ICC pattern? | HPA supplies no ICC-IF image cell lines or main subcellular location for SACS (HPA subcellular). | Use UniProt's predominantly cytoplasmic localization as a hypothesis, then evaluate IF/ICC with its own controls and guide; do not transfer the tissue IHC pattern directly (UniProt Q9NZJ4 localization; HPA subcellular; standard IF practice). |
Experiment evidence
IHC & IF images showing SACS staining
A00519 · IHCIHC analysis of Sacsin using anti-Sacsin antibody (A00519). Sacsin was detected in a paraffin-embedded section of human lung cancer tissue.
A00519 · IHCIHC analysis of Sacsin using anti-Sacsin antibody (A00519). Sacsin was detected in a paraffin-embedded section of mouse brain tissue. Heat m
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000151835-SACS/tissue/cerebral+cortex#imid_4519356
HPA · Parathyroid glandHuman Protein Atlas IHC, Parathyroid gland. Source: https://www.proteinatlas.org/ENSG00000151835-SACS/tissue/parathyroid+gland#imid_4519247
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000151835-SACS/tissue/colon#imid_4519290
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000151835-SACS/tissue/liver#imid_4519291
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for SACS IHC & IF
🧪Run epididymis first and expect staining in glandular cells (HPA: High in epididymis glandular cells). Use adipose tissue adipocytes as the negative tissue (HPA: Not detected in adipocytes); on the epididymis slide, assess nearby nonglandular cells for background staining without assuming they are SACS-negative, since the supplied HPA row assigns no level to them.
Positive control tissue: Epididymis (Glandular 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 SACS; derive a cell-line control from the positive tissue's cell type (Glandular cells) and confirm it by RNA or western blot first.
Technical controls: Include a no-primary, secondary-only control; a rabbit IgG isotype control matched to the primary antibody’s clonality where known (caption: rabbit primary; clonality unreported); and, if available, a SACS knockout specimen or an immunizing-peptide block. For chromogenic detection, quench endogenous peroxidase and inspect the epididymis section for background DAB signal (caption: peroxidase secondary and DAB).
⚠️Feasibility: No target-specific fixation window or fixation effect is reported, and the fixative for the selected A00519 paraffin-section image is unreported (caption: paraffin section; fixative not stated). That image used heat retrieval in EDTA at pH 8.0, but it does not establish whether retrieval is required for all specimens (caption: EDTA retrieval). Whether frozen sections or IF are easier is unreported (HPA: no ICC-IF image cell lines listed); no tissue-specific artefact is documented in the supplied evidence.
HPA tissue IHC evidence for SACS
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Uncertain — Low 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 |
|---|---|---|---|---|
| Epididymis | Glandular cells | High | Protein (IHC) | HPA → |
| Parathyroid gland | Glandular cells | High | Protein (IHC) | HPA → |
| Placenta | Trophoblastic cells | High | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Medium | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Medium | Protein (IHC) | HPA → |
Section 3
Advanced SACS IHC Tips
Troubleshoot Sacsin staining in paraffin sections using the catalog antibody’s IHC evidence, with separate guidance for exploratory IF.
What retrieval should I use when Sacsin staining is weak in paraffin sections?
Start with heat-mediated retrieval in EDTA at pH 8.0 for paraffin sections (datasheet A00519). The selected tissue-IHC example used this retrieval before incubation with 2 μg/ml antibody overnight at 4°C, so assess retrieval alongside antibody exposure rather than changing both at once (datasheet A00519). If staining remains weak, compare a second retrieval condition on matched sections while holding detection and development constant (standard IHC practice). Include a no-primary control and inspect tissue integrity, because increased signal after harsher heating alone does not establish Sacsin specificity (standard IHC practice). Record buffer, pH, heating conditions and staining distribution for each comparison (standard IHC practice).
How should I troubleshoot fixation-related loss of Sacsin staining?
The selected Sacsin image documents a paraffin section but does not report its fixative, so target-specific fixation sensitivity is unknown (datasheet A00519). Compare sections with documented fixation histories while keeping pH 8.0 EDTA retrieval, antibody concentration and detection conditions constant (datasheet A00519; standard IHC practice). Include comparable positive tissue and a no-primary control in each run, then assess both staining and morphology (standard IHC practice). Avoid attributing a weak section to Sacsin’s cytoplasmic location or modified residues: those annotations do not establish a fixation effect (UniProt Q9NZJ4; standard IHC practice). Report the fixative and processing history when interpreting any difference (standard IHC practice).
Where should convincing Sacsin staining appear in a paraffin section?
Expect predominantly cytoplasmic staining when evaluating Sacsin IHC, and identify the stained cell type before judging signal strength (UniProt Q9NZJ4; HPA: cytoplasmic expression in several tissues). A small nuclear fraction and partial overlap with mitochondrial Hsp60 are reported, but a chromogenic section alone cannot establish mitochondrial overlap (UniProt Q9NZJ4; standard IHC practice). Sacsin has no annotated transmembrane segment, so an isolated membrane rim warrants scrutiny against morphology and controls (UniProt Q9NZJ4; standard IHC practice). Compare cytoplasmic distribution in matched sections and review no-primary staining before calling an unusual compartment positive (standard IHC practice). Interpret tissue patterns cautiously because HPA rates its tissue staining reliability Uncertain (HPA: low staining–RNA consistency).
Could isoforms or epitope accessibility explain different Sacsin staining patterns?
Sacsin has 2 annotated isoforms, but the supplied evidence does not map the catalog antibody’s epitope to either one (UniProt Q9NZJ4; datasheet A00519). Consequently, a staining difference cannot be assigned to isoform selection without epitope information and an independent specificity check (standard IHC practice). The protein includes a ubiquitin-like region at residues 9–84, a J domain at 4306–4393 and a HEPN domain at 4451–4567; these positions do not identify the antibody’s binding site (UniProt Q9NZJ4). Document retrieval and processing consistently when comparing sections, since epitope accessibility can vary with those conditions (standard IHC practice). Treat loss of staining as an assay observation until specificity is established (standard IHC practice).
How can I investigate a Sacsin IHC pattern with multiplex IF?
Use IF as a separate validation experiment, since the supplied catalog example establishes a chromogenic paraffin-section workflow rather than an IF protocol (datasheet A00519). Pair Sacsin with a marker for the cell type identified by morphology, and choose spectrally separated fluorophores after checking unstained tissue for autofluorescence (standard IF practice). Because Sacsin is predominantly cytoplasmic and lacks a transmembrane segment, permeabilisation should provide antibody access to intracellular epitopes; its exact epitope is unreported (UniProt Q9NZJ4; datasheet A00519). Include single-label and no-primary controls to evaluate bleed-through and background before interpreting overlap (standard IF practice). Treat apparent mitochondrial overlap as provisional unless an appropriate mitochondrial marker supports it (UniProt Q9NZJ4; standard IF practice).
What should I check when Sacsin IHC shows widespread brown background?
First compare the stained section with a no-primary control and examine whether brown signal follows cells, tissue edges or damaged areas (standard IHC practice). The selected example used 10% goat serum blocking, a peroxidase-linked secondary and DAB development; those conditions describe one demonstrated staining workflow (datasheet A00519). Check peroxidase blocking and DAB development as general chromogenic IHC steps, and compare matched sections before changing antibody concentration or incubation (standard IHC practice). If background persists, evaluate nonspecific secondary binding and endogenous pigment under the microscope (standard IHC practice). Do not treat diffuse brown staining as Sacsin merely because cytoplasmic expression occurs in several tissues (HPA: cytoplasmic expression; standard IHC practice).
How should I quantify Sacsin staining across paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and region of interest before scoring, then use the same acquisition and analysis settings across sections (standard IHC practice). An H-score can combine the percentage of cells at each staining intensity; alternatively, report percent positive cells or positive-cell density per mm² when those measures fit the question (standard IHC practice). Normalise counts to the assessed cell population or tissue area, and exclude folds, edges and necrotic regions by a predefined rule (standard IHC practice). Keep retrieval, DAB development and counterstaining consistent across the comparison (standard IHC practice). Report controls and interpret differences cautiously because HPA tissue staining has Uncertain reliability (HPA: low staining–RNA consistency).
How can I distinguish true Sacsin staining from artefact?
Favor reproducible intracellular staining in identifiable cells over signal confined to section edges, necrosis or areas with poor morphology (standard IHC practice). Predominantly cytoplasmic staining is compatible with Sacsin, whereas a pure membrane outline is unexpected for a protein without a transmembrane segment (UniProt Q9NZJ4). Compare no-primary controls to identify detection-related signal, including endogenous enzyme activity in a peroxidase and DAB workflow (datasheet A00519; standard IHC practice). Check whether the stained cell type matches the claim: HPA reports high staining in epididymal and parathyroid glandular cells and placental trophoblastic cells, yet rates tissue staining reliability Uncertain (HPA: tissue IHC). Confirm surprising patterns with an independent specificity approach before assigning them to Sacsin (standard IHC practice).
Boster reagents
Best SACS / Sacsin IHC Antibodies
The IHC-validated anti-SACS antibody has paraffin-section images from human lung cancer and cerebellum, plus mouse and rat brain; no IF images are supplied (catalog images).
Real IHC data
Anti-Sacsin Antibody
Cat # A00519
A00519 is the sole SKU shown, with IHC listed for human, mouse, and rat (catalog: applications and reactivity). Its images show paraffin sections of human lung cancer and cerebellum and mouse and rat brain (A00519 image captions).
Which to pick: Choose A00519 for paraffin-section IHC: it is a rabbit polyclonal antibody with an IHC application listing and images from paraffin sections (catalog; A00519 image captions). No listed SKU is validated for IF/ICC, so the payload does not support an IF/ICC choice (catalog: applications and images). A00519 covers human, mouse, and rat IHC (catalog: reactivity; A00519 image captions); the captions report paraffin embedding but do not report the fixative (A00519 image captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q9NZJ4 (SACS_HUMAN, Sacsin).
- Human Protein Atlas. SACS tissue IHC expression (reliability: Uncertain).
- Human Protein Atlas. SACS subcellular location (ICC-IF): Highest expression in PODO/TERT256: 34.6 nTPM.
- Human Protein Atlas. SACS antibody validation summary (1 antibodies).
- Structural changes in the lacrimal sac epithelium and associated lymphoid tissue during experimental dacryocystitis. Clinical ophthalmology (Auckland, N.Z.) 2011 — PMC3218166.
- The ataxia protein sacsin is a functional co-chaperone that protects against polyglutamine-expanded ataxin-1. Human molecular genetics 2009 — PMC2667285.
- A comparative study of smooth muscle cell characteristics and myofibroblasts in processus vaginalis of pediatric inguinal hernia, hydrocele and undescended testis. BMC urology 2024 — PMC11137961.
- Loss of Aquaporin-3 in Placenta and Fetal Membranes Induces Growth Restriction in Mice. Development & reproduction 2018 — PMC6182233.
- PubMed PMID:10655055 — UniProt-cited evidence.
- PubMed PMID:15057823 — UniProt-cited evidence.
- PubMed PMID:17974005 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for SACS (Sacsin). Expected localisation Cytoplasmic tissue staining (HPA tissue IHC). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A00519). Validated IHC antibody: A00519 at 2-5μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Epididymis (Glandular cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human lung cancer tissue; fixative not specified (datasheet A00519); 2. Fixation: Image fixative and duration unreported (datasheet A00519); 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 A00519); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A00519); 8. Primary antibody: Rabbit anti-SACS, 2-5μg/ml (datasheet A00519); 9. Primary incubation: Overnight at 4 °C (datasheet A00519). Watch for: Fixation: Keep fixation consistent between sections (standard IHC practice; not target-specific); Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image A00519); Caveat: Staining has low consistency with tissue RNA (HPA tissue IHC); Isoform / epitope: 2 isoforms; intracellular epitope differences unknown (UniProt); Regulation: No specific expression regulator is reported (UniProt). Evidence: UniProt Q9NZJ4, HPA tissue IHC · Uncertain, HPA cell-line RNA · Highest expression in PODO/TERT256: 34.6 nTPM, Datasheet A00519, PMC2667285. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/SACS/immunohistochemistry-ihc-guide.