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SAMSN1 / SAM domain-containing protein SAMSN-1 · IHC design guide
Design Immunohistochemistry for SAMSN1
Plan SAMSN1 chromogenic IHC in paraffin sections using the catalog antibody at 2–5 μg/mL (datasheet A08977-2). Assess cytoplasmic staining in Leydig and immune cells, bearing in mind the low consistency between antibody staining and RNA data (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
SAMSN1 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); nuclear shuttling is possible (UniProt) | |
| Staining pattern | Cytoplasmic staining, strongest in Leydig and immune cells (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A08977-2) | |
| Positive control | Lymph node+4 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 | Antibody staining has low consistency with RNA data (HPA tissue IHC) | |
| Regulation | No stimulus-dependent change in abundance is established (UniProt) | |
| Isoform / epitope | 3 isoforms; epitope coverage is unknown (UniProt) |
Section 1
Recommended SAMSN1 IHC & IF Protocols
The catalog antibody’s IHC-P protocol (datasheet A08977-2) is accompanied by published SAMSN1 protocols for HCC tissue (PMC12923737), glioblastoma tissue microarrays (PMC3838348), and skin (PMC13107425).
| Sample | Paraffin-embedded human tonsil tissue; fixative not specified (datasheet A08977-2) |
| Fixation | Image fixative and duration unreported (datasheet A08977-2); 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 A08977-2); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A08977-2) |
| Primary antibody | Rabbit anti-SAMSN1, 2-5 μg/ml (datasheet A08977-2) |
| Primary incubation | Overnight at 4 °C (datasheet A08977-2) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet A08977-2) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | SAMSN1-positive staining in germinal center cells of lymph node (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in several different tissues, most abundant in Leydig cells and immune cells. No signal in the no-primary control. |
💡Decision noteStart with EDTA pH 8.0 heat retrieval for the catalog antibody (datasheet A08977-2). Published protocols use citrate retrieval for comparison (PMC12923737; PMC13107425).
Section 2
What Is the Expected SAMSN1 Staining Pattern?
In paraffin-section IHC, expect SAMSN1 mainly in the cytoplasm of selected cells, especially lymph-node and tonsil germinal-center cells and testicular Leydig cells (HPA tissue IHC: High). UniProt also places SAMSN1 in the nucleus, cytoplasm and membrane ruffles; it has no transmembrane segment (UniProt Q9NSI8 localization and topology). Treat the tissue pattern as a guide: HPA rates its IHC reliability Approved but reports low agreement with RNA data (HPA tissue IHC).
| Clear cytoplasmic staining in germinal-center cells or Leydig cells, with restrained staining elsewhere. | This fits the strongest reported tissue pattern (HPA tissue IHC: High in lymph-node and tonsil germinal-center cells and testicular Leydig cells). Compare named cell populations, since a positive area alone does not establish which cells carry the signal (general IHC practice). |
| Signal is predominantly extracellular, luminal or uniformly nuclear, without the expected cytoplasmic pattern. | Investigate an artefact or a different target: HPA describes tissue IHC as cytoplasmic (HPA tissue IHC). Nuclear localization is possible, so nuclear staining alone cannot be dismissed categorically (UniProt Q9NSI8 localization). Confirm the compartment against the counterstain and a second IHC-approved antibody (general IHC practice; HPA antibodies: IHC Approved). |
| Strong staining occurs in adipocytes or another cell population listed as undetected. | Consider cross-reactivity or endogenous detection activity before assigning SAMSN1 positivity (general IHC practice). HPA reports no detection in adipose or breast adipocytes, among other listed cells (HPA tissue IHC: Not detected). Check the cell identity and run a no-primary control. |
| Weak, diffuse color covers many tissue compartments and obscures cell borders. | This does not provide a readable cell-specific result (general IHC practice). Check a no-primary control for detection background, then review blocking, antibody concentration, washing and chromogen development (general IHC practice). Do not score diffuse color as SAMSN1 expression. |
| No staining appears in germinal-center cells or Leydig cells on the study run. | A failed positive control, weak detection or unsuitable staining conditions are possible (general IHC practice). These cells are reported as High, but HPA also flags low agreement with RNA data, so one negative section cannot establish absence of SAMSN1 (HPA tissue IHC: High; reliability description). |
💡Expected SAMSN1 appearanceCall an IHC result supportive when High, predominantly cytoplasmic staining identifies germinal-center cells or Leydig cells (HPA tissue IHC: High; cytoplasmic profile); widespread staining of HPA-undetected adipocytes is a possible false positive requiring controls (HPA tissue IHC: Not detected; general IHC practice).
| Tissue and cell selection | Lymph-node or tonsil germinal-center cells and testicular Leydig cells offer reported High staining; bone-marrow hematopoietic cells are Medium (HPA tissue IHC). Judge each named population separately. |
| IHC evidence strength | HPA marks tissue IHC Approved while reporting low consistency with RNA expression and pending external verification (HPA tissue IHC). A matching image supports interpretation but does not resolve antibody specificity on its own. |
| Antibody choice | HPA010645, HPA017055 and HPA046639 each have IHC Approved status (HPA antibodies). If a result is disputed, compare an independently tested IHC-approved antibody; the supplied record gives no epitope or dilution for these reagents. |
| Compartment and topology | The tissue IHC profile is cytoplasmic (HPA tissue IHC). UniProt also lists nucleus, cytoplasm and actin-rich ruffles, with no transmembrane segment (UniProt Q9NSI8 localization and topology). Interpret apparent edge staining in its assay context. |
| Isoforms and modifications | UniProt lists 3 isoforms and several phosphorylated residues (UniProt Q9NSI8 isoforms and modified residues). The supplied sources do not map antibody epitopes or show that these features change paraffin-section staining. |
| IF/ICC: what localization should I expect? | HPA reports plasma membrane as the main ICC-IF location and nucleoplasm as an additional location (HPA subcellular: approved; supported). That assay-specific observation does not replace the cytoplasmic tissue-IHC reference (HPA tissue IHC). |
| Situation | Likely cause | Next action |
|---|---|---|
| Positive-control cells are blank. | The run may have weak antibody or detection signal; a negative result alone does not identify the failed step (general IHC practice). | Repeat with a known-positive lymph-node, tonsil or testis section and check the detection controls (HPA tissue IHC: High; general IHC practice). Optimize retrieval only as a general IHC variable: target-specific fixation sensitivity is unreported. |
| A no-primary control develops color. | Endogenous detection activity or secondary-reagent background can produce color without target antibody (general IHC practice). | Check the detection system and apply its appropriate endogenous-activity block; repeat the no-primary control before interpreting the SAMSN1 slide (general IHC practice). |
| Adipocytes stain strongly. | The cell pattern conflicts with HPA's undetected adipocytes and may reflect nonspecific staining (HPA tissue IHC: Not detected; general IHC practice). | Verify cell identity, compare a no-primary control and assess a second IHC-approved antibody (general IHC practice; HPA antibodies: IHC Approved). |
| Color is diffuse across the section. | Excess antibody, incomplete washing or prolonged chromogen development can obscure cell-specific staining (general IHC practice). | Review antibody concentration, wash steps and development time; score only resolved staining in identifiable cells (general IHC practice). |
| Staining appears nuclear only. | The result differs from HPA's cytoplasmic tissue-IHC profile, although nuclear SAMSN1 localization is documented (HPA tissue IHC; UniProt Q9NSI8 localization). | Check the counterstain and positive-control compartment, then compare another IHC-approved antibody before calling the result specific (general IHC practice; HPA antibodies: IHC Approved). |
| Two IHC-approved antibodies disagree. | Approval does not guarantee identical patterns; HPA flags low antibody-staining versus RNA consistency (HPA antibodies: IHC Approved; HPA tissue IHC reliability description). | Compare the same named cell population and controls across matched sections; report the discordance rather than assigning a definitive positive or negative call (general IHC practice). |
Experiment evidence
IHC & IF images showing SAMSN1 staining
A08977-2 · IHCIHC analysis of SAMSN1 using anti-SAMSN1 antibody (A08977-2). SAMSN1 was detected in a paraffin-embedded section of human tonsil tissue. Hea
A08977-2 · IHCIHC analysis of SAMSN1 using anti-SAMSN1 antibody (A08977-2). SAMSN1 was detected in a paraffin-embedded section of mouse brain tissue. Heat
A08977-2 · IFIF analysis of SAMSN1 using anti-SAMSN1 antibody (A08977-2). SAMSN1 was detected in an immunocytochemical section of HEL cells. Enzyme antig
A08977 · IFImmunocytochemistry of SAMSN1 in HeLa cells with SAMSN1 antibody at 2.5 μg/ml.
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000155307-SAMSN1/tissue/cerebral+cortex#imid_2959940
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000155307-SAMSN1/tissue/colon#imid_2959874
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000155307-SAMSN1/tissue/liver#imid_2959875
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000155307-SAMSN1/tissue/kidney#imid_2959868
HPA · ICC-IF HELHuman Protein Atlas immunofluorescence, HEL, antibody HPA010645; green = SAMSN1, blue = nucleus, red = microtubules.
HPA · ICC-IF HELHuman Protein Atlas immunofluorescence, HEL, antibody HPA010645; green = SAMSN1, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for SAMSN1 IHC & IF
🧪Run tonsil first and look for staining in germinal center cells (High; HPA: tonsil). Use oral mucosa squamous epithelium as the negative tissue (HPA: Not detected in squamous epithelial cells), and compare non–germinal center cells on the tonsil slide with the germinal centers without assuming those cells are SAMSN1 negative.
Positive control tissue: Lymph node (Germinal center cells, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show SAMSN1 in HEL, K-562, REH, U2OS, with annotated localisation: Plasma membrane (approved) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only control; a concentration-matched rabbit IgG isotype control matched to the primary antibody’s clonality where known (catalog caption: rabbit primary); and a SAMSN1 knockout or validated peptide-block control. For tonsil DAB IHC, quench endogenous peroxidase and check for background staining (catalog caption: HRP/DAB detection in tonsil).
⚠️Feasibility: No target-specific fixation window or fixation effect is reported, and the selected A08977-2 paraffin-section caption does not state the fixative (catalog caption: fixative unreported). The reported tonsil IHC used heat retrieval in EDTA pH 8.0, but whether that retrieval is required is unreported (catalog caption: EDTA heat retrieval). The supplied evidence does not establish that frozen sections or IF are easier; endogenous peroxidase can complicate DAB interpretation in tonsil (catalog caption: tonsil HRP/DAB assay).
HPA tissue IHC evidence for SAMSN1
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — Low 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 |
|---|---|---|---|---|
| Lymph node | Germinal center cells | High | Protein (IHC) | HPA → |
| Testis | Leydig cells | High | Protein (IHC) | HPA → |
| Tonsil | Germinal center cells | High | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Medium | Protein (IHC) | HPA → |
| Appendix | Lymphoid tissue | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Breast | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Cervix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Endometrium | Cells in endometrial stroma | Not detected | Protein (IHC) | HPA → |
| Oral mucosa | Squamous epithelial cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced SAMSN1 IHC Tips
Troubleshoot SAMSN1 staining by checking retrieval, cell identity, and compartment before comparing signal intensity across paraffin sections.
Which retrieval condition should I try first for weak SAMSN1 staining in paraffin sections?
Start with heat-mediated antigen retrieval in EDTA at pH 8.0 (datasheet A08977-2). Use the catalog antibody’s tonsil example as a reference for the subsequent incubation: 2 μg/ml overnight at 4°C (datasheet A08977-2). If staining remains weak, compare retrieval duration on adjacent sections while holding antibody concentration and detection conditions constant (standard IHC practice). Excessive heating can damage section morphology, so assess tissue integrity alongside staining (standard IHC practice). The example identifies a paraffin-embedded section but does not report its fixative; a different fixation history may change the retrieval response (datasheet A08977-2; standard IHC practice).
How should I troubleshoot fixation-related loss of SAMSN1 signal?
Target-specific fixation sensitivity is unknown: the selected SAMSN1 paraffin-section caption does not state a fixative (datasheet A08977-2). Record the fixative, fixation duration, and processing history for each section before comparing staining (standard IHC practice). If a weak section differs in preparation from a responsive control, stain them in the same run with the catalog antibody’s EDTA pH 8.0 retrieval condition (datasheet A08977-2; standard IHC practice). Assess morphology and the control’s staining before changing antibody concentration, because preparation and detection can each affect signal (standard IHC practice). Neither the tissue staining pattern nor the protein record establishes a SAMSN1-specific fixation requirement (HPA tissue IHC; UniProt Q9NSI8).
Which staining compartments are plausible for SAMSN1 in tissue IHC?
Evaluate cytoplasmic staining first in tissue sections: the tissue profile describes cytoplasmic expression, including abundant signal in immune cells and Leydig cells (HPA tissue IHC). Nuclear staining can also be biologically plausible because SAMSN1 shuttles between cytoplasm and nucleus (UniProt Q9NSI8 subcellular location). Plasma membrane and nucleoplasmic localisation have been reported in cell imaging, but their relative prominence need not match a chromogenic tissue section (HPA subcellular; standard IHC practice). SAMSN1 has no transmembrane segment, so a crisp membrane outline alone should prompt review of cell identity, section morphology, and controls (UniProt Q9NSI8 topology; standard IHC practice). Score compartments separately rather than pooling all brown signal (standard IHC practice).
Could isoforms or epitope accessibility explain discordant SAMSN1 staining?
SAMSN1 has 3 listed isoforms, so establish which sequence region the antibody recognises before treating a negative section as absence of all SAMSN1 forms (UniProt Q9NSI8 isoforms; standard IHC practice). The supplied caption documents staining conditions but gives no epitope coordinates or isoform coverage (datasheet A08977-2). The protein contains an SH3 domain at residues 163–224 and a SAM domain at 241–305, with several recorded phosphorylation sites near its N terminus (UniProt Q9NSI8 domains and modified residues). Those features justify checking epitope documentation and a suitable specificity control; they do not establish that any particular modification blocks this antibody (UniProt Q9NSI8; standard IHC practice).
How can IF help resolve an ambiguous SAMSN1 IHC pattern?
Use IF as an independent localisation check when chromogenic staining obscures cell boundaries, while keeping the paraffin-section IHC result as the primary readout (standard IHC/IF practice). In tonsil, multiplex SAMSN1 with a B-cell marker such as CD20 to assess whether signal overlaps the expected germinal-center population (HPA tissue IHC: high in tonsil germinal-center cells; UniProt Q9NSI8: detected in B-cells; standard immunophenotyping). Choose a spectrally separated, preferably far-red fluorophore after checking tissue autofluorescence and single-stain controls (standard IF practice). Because the antibody’s epitope side is unspecified, compare mild permeabilisation with an unpermeabilised control when assessing membrane-adjacent signal; intracellular cytoplasmic or nucleoplasmic epitopes require access (HPA subcellular; standard IF practice).
What should I check when SAMSN1 DAB staining is diffuse or widespread?
Inspect a no-primary control for secondary-reagent or detection background, and include a peroxidase block before DAB development as part of the general chromogenic workflow (standard IHC practice). The selected example used 10% goat serum blocking, peroxidase-conjugated secondary antibody, and DAB detection; those are reported conditions, not proof that background is absent (datasheet A08977-2). Compare staining in expected germinal-center cells with adjacent cell populations, because broad brown haze can hide a cell-specific pattern (HPA tissue IHC; standard IHC practice). Check section edges, folds, and damaged areas, then adjust blocking, washing, or detection exposure one variable at a time (standard IHC practice).
How should I quantify SAMSN1 staining across paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and compartment before scoring: tonsil germinal-center cells and lymph-node germinal-center cells are reported as high, whereas several other cell populations are not detected (HPA tissue IHC). For intensity, apply one prespecified 0–3 scale and calculate an H-score from the percentages in each intensity category (standard IHC practice). Alternatively report percent positive cells or positive-cell density per mm² within the same annotated compartment (standard IHC practice). Normalise counts to viable cells or measured viable tissue area, exclude folds and necrosis, and keep illumination, threshold, and scoring rules fixed across slides (standard IHC practice).
When is an unexpected SAMSN1-positive cell or compartment convincing?
Look for reproducible staining in intact cells within an expected population, such as tonsil or lymph-node germinal-center cells, and compare it with nearby negative controls (HPA tissue IHC; standard IHC practice). Cytoplasmic staining fits the tissue profile, while nuclear signal has support from the protein’s reported shuttling; a membrane-only outline needs closer scrutiny (HPA tissue IHC; UniProt Q9NSI8 subcellular location; standard IHC practice). Disregard staining confined to section edges, folds, necrosis, or a positive no-primary control until processing or endogenous-enzyme artefacts are resolved (standard IHC practice). Treat surprising patterns cautiously because the tissue antibody has low consistency between staining and RNA data and awaits external verification (HPA tissue IHC reliability).
Boster reagents
Best SAMSN1 / SAM domain-containing protein SAMSN-1 IHC Antibodies
Anti-SAMSN1 image data cover paraffin-section IHC in human tonsil and mouse and rat brain, and IF/ICC in human HEL and HeLa cells (catalog image captions).
Real IHC data
Anti-SAMSN1 Antibody ®
Cat # A08977-2
Real IF data
Anti-SAMSN SAMSN1 Antibody
Cat # A08977
A08977-2 has paraffin-section IHC images from human tonsil and mouse and rat brain, plus an IF image from human HEL cells (A08977-2 image captions). A08977 lists human IF/ICC and has HeLa-cell ICC and IF images (A08977 applications, reactivity and image captions).
Which to pick: Choose A08977-2 for chromogenic tissue IHC: its paraffin-section captions show EDTA pH 8.0 retrieval and DAB detection at 2 μg/ml; the fixative is unreported (A08977-2 IHC image captions). For IF/ICC, A08977 has human HeLa-cell images, while A08977-2 has a human HEL-cell IF image (A08977 and A08977-2 image captions). For IHC across human, mouse and rat samples, choose A08977-2: it lists IHC and all three species, while A08977 lists human IF/ICC without IHC (catalog applications and reactivity).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q9NSI8 (SAMN1_HUMAN, SAM domain-containing protein SAMSN-1).
- Human Protein Atlas. SAMSN1 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. SAMSN1 subcellular location (ICC-IF): Mainly localized to the plasma membrane. In addition localized to the nucleoplasm..
- Human Protein Atlas. SAMSN1 antibody validation summary (3 antibodies).
- SAMSN1 restrains NK cell mediated anti-tumor immunity in hepatocellular carcinoma. Nature communications 2026 — PMC12923737.
- SAMSN1 is highly expressed and associated with a poor survival in glioblastoma multiforme. PloS one 2013 — PMC3838348.
- Experimental Validation of an Immune Cell Infiltration Signature in Psoriasis: Translating Computational Modeling to In Vivo Efficacy. Journal of clinical laboratory analysis 2026 — PMC13107425.
- Characterization of the role of Samsn1 loss in multiple myeloma development. FASEB bioAdvances 2020 — PMC7475304.
- PubMed PMID:11536050 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
- PubMed PMID:10830953 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for SAMSN1 (SAM domain-containing protein SAMSN-1). Expected localisation Cytoplasmic tissue staining (HPA tissue IHC); nuclear shuttling is possible (UniProt). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A08977-2). Validated IHC antibody: A08977-2 at 2-5 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Lymph node (Germinal center cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human tonsil tissue; fixative not specified (datasheet A08977-2); 2. Fixation: Image fixative and duration unreported (datasheet A08977-2); 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 A08977-2); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A08977-2); 8. Primary antibody: Rabbit anti-SAMSN1, 2-5 μg/ml (datasheet A08977-2); 9. Primary incubation: Overnight at 4 °C (datasheet A08977-2). Watch for: Fixation: Keep fixation consistent across sections (standard IHC practice; not target-specific); Caveat: Antibody staining has low consistency with RNA data (HPA tissue IHC); Isoform / epitope: 3 isoforms; epitope coverage is unknown (UniProt); Regulation: No stimulus-dependent change in abundance is established (UniProt). Evidence: UniProt Q9NSI8, HPA tissue IHC · Approved, HPA ICC-IF · Mainly localized to the plasma membrane. In addition localized to…, Datasheet A08977-2, PMC12923737, PMC3838348. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/SAMSN1/immunohistochemistry-ihc-guide.