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SMC6 / Structural maintenance of chromosomes protein 6 · IHC design guide
Design Immunohistochemistry for SMC6
Plan chromogenic paraffin IHC for SMC6 with the catalog antibody at 0.5–1 µg/ml (datasheet A01554-1). Assess nuclear and cytoplasmic staining (HPA tissue IHC), using seminiferous duct cells as a medium-staining reference (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
SMC6 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 | Nucleus (UniProt); nuclear and cytoplasmic tissue staining (HPA tissue IHC) | |
| Staining pattern | Most tissues show nuclear and cytoplasmic staining (HPA tissue IHC) | |
| Antigen retrieval | Citrate pH 6 HIER, heat-mediated (datasheet A01554-1) | |
| Positive control | Gallbladder+1 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent across sections (standard IHC practice; not target-specific) | |
| Caveat | Tissue staining reliability is uncertain (HPA tissue IHC) | |
| Regulation | Strong expression in testis (UniProt) | |
| Isoform / epitope | Two isoforms; epitope differences are unreported (UniProt) |
Section 1
Recommended SMC6 IHC & IF Protocols
Compare the catalog antibody’s IHC-P protocol (datasheet: A01554-1) with published chromogenic SMC6 methods (PMC3763431; PMC12826375).
| Sample | Paraffin-embedded mouse testis tissue; fixative not specified (datasheet A01554-1) |
| Fixation | Image fixative and duration unreported (datasheet A01554-1); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat retrieval: Citrate pH 6, 20 min (datasheet A01554-1) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A01554-1) |
| Primary antibody | Rabbit anti-SMC6, 0.5-1μg/ml (datasheet A01554-1) |
| Primary incubation | Overnight at 4 °C (datasheet A01554-1) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A01554-1) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | SMC6-positive staining in glandular cells of gallbladder (HPA tissue IHC: Medium). HPA tissue profile: Cytoplasmic and nuclear expression in most tissues. No signal in the no-primary control. |
💡Decision noteStart with citrate pH 6 heat retrieval (datasheet: A01554-1); the breast TMA method also uses citrate pH 6.0 in a steamer (PMC12826375).
Section 2
What Is the Expected SMC6 Staining Pattern?
SMC6 is a nuclear protein associated with chromatin, speckles and other nuclear structures (UniProt Q96SB8). In paraffin-section IHC, expect staining in gallbladder glandular cells and cells in testis seminiferous ducts, both reported at medium intensity (HPA: tissue IHC). HPA also reports cytoplasmic and nuclear staining across most tissues, but rates its tissue IHC profile Uncertain; interpret compartment and cell-type patterns cautiously (HPA: tissue IHC). SMC6 has no transmembrane segment (UniProt Q96SB8 topology).
| What should a positive field show, and does IF/ICC agree? | Look for nuclear staining in the reported positive cell populations, with possible cytoplasmic staining (HPA: tissue IHC, Uncertain). ICC-IF supports nucleoplasmic localization, but that result comes from a different antibody and does not validate a particular IHC pattern (HPA: subcellular; HPA: antibody validation). |
| Signal is predominantly outside nuclei, with little or no nuclear staining. | Consider an IHC artefact or nonspecific detection before assigning this pattern to SMC6: UniProt places SMC6 in the nucleus and on chromosomes (UniProt Q96SB8). Some cytoplasmic staining is reported in tissue IHC, so cytoplasmic signal alone is not enough to reject a field (HPA: tissue IHC, Uncertain). |
| Cells reported as negative stain as strongly as the expected positive cells. | Cross-reactivity or endogenous detection activity is possible; check an appropriate negative detection control (general IHC practice). For example, compare adipocytes reported as Not detected with the positive cells in the same evaluation, while recognizing that HPA's IHC profile is Uncertain (HPA: tissue IHC). |
| Color is diffuse across cells or tissue, obscuring nuclear boundaries. | This pattern cannot establish SMC6 localization. Review background and detection controls, blocking, and antibody concentration as general IHC checks. Do not interpret a broad cytoplasmic haze as the reported cytoplasmic component without distinguishable cellular staining (HPA: tissue IHC, Uncertain). |
| No signal appears in gallbladder glandular cells or testis seminiferous-duct cells. | These are reported medium-staining populations, so a blank result calls for a run-control review before concluding that SMC6 is absent (HPA: tissue IHC). Check section integrity, retrieval and detection performance as general IHC practice; the supplied sources do not establish SMC6-specific retrieval requirements. |
💡Expected SMC6 appearanceA credible positive shows discernible nuclear staining in gallbladder glandular cells or testis seminiferous-duct cells at about the reported medium level, with possible cytoplasmic staining; uniform background or dominant extranuclear staining without a nuclear component warrants investigation (HPA: tissue IHC, Uncertain; UniProt Q96SB8 localization).
| Tissue and cell selection (HPA: tissue IHC) | Gallbladder glandular cells and testis seminiferous-duct cells are reported Medium; selected adipocytes and other listed populations are Not detected. Judge the named cell populations, not an entire organ, and allow for the Uncertain IHC reliability rating (HPA: tissue IHC). |
| Compartment evidence (UniProt Q96SB8; HPA: subcellular) | UniProt reports nuclear and chromosome-associated SMC6; ICC-IF supports nucleoplasmic localization. Tissue IHC additionally reports cytoplasmic staining, so compare nuclear detail and cell identity rather than requiring an exclusively nuclear chromogen signal (HPA: tissue IHC, Uncertain). |
| Antibody-specific validation (HPA: antibody validation) | HPA lists IHC as Uncertain for HPA042733 and CAB037186; ICC as Supported for HPA035057. Those ratings apply to their respective antibodies and applications and do not transfer automatically to a catalog IHC-validated antibody. |
| Isoforms and processing (UniProt Q96SB8) | UniProt lists 2 isoforms, no signal peptide or propeptide, and a chain spanning residues 1–1091. The supplied evidence gives no epitope location or isoform-specific IHC pattern, so it cannot predict which isoform an antibody detects. |
| Detection chemistry (general IHC practice) | Endogenous detection activity can imitate cellular chromogen staining. Use an appropriate detection control when unexpected cell types stain; this is a general assay check, not an established SMC6 tissue pattern. |
| Situation | Likely cause | Next action |
|---|---|---|
| Expected positive cells are blank. | The run may have failed, or signal may be below detection; HPA reports Medium staining in the named positive cells (HPA: tissue IHC). | Check a positive control, section quality, retrieval and detection steps under the antibody's IHC instructions (general IHC practice). Avoid calling the sample negative until the run performs. |
| Nuclei are blank but cytoplasm is strongly colored. | SMC6 has nuclear localization (UniProt Q96SB8), although HPA describes some cytoplasmic tissue staining with Uncertain reliability (HPA: tissue IHC). | Inspect nuclear counterstain and a negative detection control; reassess antibody concentration and background using the antibody's IHC instructions (general IHC practice). |
| A reported negative cell population is positive. | Possible cross-reactivity or endogenous detection activity; HPA reports adipocytes as Not detected (HPA: tissue IHC). | Confirm the stained cell identity and compare negative detection controls. Treat the HPA result as a reference pattern, not an absolute exclusion, because its IHC reliability is Uncertain (HPA: tissue IHC). |
| Diffuse color hides cell boundaries. | Background may be obscuring any specific nuclear signal; the field cannot support a compartment call (general IHC interpretation). | Review blocking, washes, antibody concentration and detection controls within the antibody's IHC instructions (general IHC practice). Reassess only where nuclei and individual cells remain readable. |
| IF/ICC and paraffin IHC appear different. | HPA supports nucleoplasmic ICC-IF, while tissue IHC reports nuclear and cytoplasmic staining and is rated Uncertain; the HPA validation entries also concern different antibodies (HPA: subcellular; HPA: tissue IHC; HPA: antibody validation). | Compare cell identity and nuclear localization within each application. Use the separate IF/ICC guide for its workflow; do not treat ICC-IF support as validation of the paraffin IHC result. |
Experiment evidence
IHC & IF images showing SMC6 staining
A01554-1 · IHCIHC analysis of SMC6L1 using anti-SMC6L1 antibody (A01554-1). SMC6L1 was detected in paraffin-embedded section of mouse testis tissue. Heat
A01554-1 · IHCIHC analysis of SMC6L1 using anti-SMC6L1 antibody (A01554-1). SMC6L1 was detected in paraffin-embedded section of rat testis tissue. Heat me
A01554-1 · IFIF analysis of SMC6L1 using anti-SMC6L1 antibody (A01554-1). SMC6L1 was detected in immunocytochemical section of A431 cell. Enzyme antigen
A01554-2 · IHCIHC analysis of SMC6 using anti-SMC6 antibody (A01554-2). SMC6 was detected in a paraffin-embedded section of human breast cancer tissue. He
A01554-2 · IFIF analysis of SMC6 and Tubulin beta using anti-SMC6 antibody (A01554-2) and anti-Tubulin beta antibody (M05613-4). SMC6 and Tubulin beta wa
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000163029-SMC6/tissue/cerebral+cortex#imid_14026880
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000163029-SMC6/tissue/colon#imid_14025126
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000163029-SMC6/tissue/liver#imid_14025135
HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000163029-SMC6/tissue/kidney#imid_14025128
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA035057; green = SMC6, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA035057; green = SMC6, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for SMC6 IHC & IF
🧪Run testis first: cells in seminiferous ducts should show nuclear staining (HPA: Medium in cells in seminiferous ducts; UniProt Q96SB8: nuclear localization). Use adipose tissue as a negative comparator because adipocytes are not detected; on the testis slide, any cells without nuclear DAB signal should remain at counterstain or background levels, but their absence of signal alone does not establish that they lack SMC6 (HPA: Not detected in adipocytes; standard IHC interpretation).
Positive control tissue: Gallbladder (Glandular cells, HPA Medium)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show SMC6 in A-431, Rh30, U2OS, with annotated localisation: Nucleoplasm (supported) (HPA subcellular).
Technical controls: Include a secondary-only control with no primary antibody, a concentration-matched rabbit IgG isotype control matched to the primary antibody’s clonality, and SMC6 knockout tissue if available (caption: rabbit primary; standard IHC controls). For testis, block endogenous peroxidase and assess endogenous biotin background when using the reported SABC/DAB detection system (caption: mouse testis; SABC/DAB; standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected A01554-1 mouse testis paraffin-section caption does not state a fixative (caption: fixative not stated). The reported workflow uses heat retrieval in citrate buffer at pH 6 for 20 minutes; that condition does not establish that retrieval is required for SMC6 (caption: citrate retrieval). Frozen sections are undocumented in the supplied evidence, and their ease relative to IF cannot be determined; HPA documents nucleoplasmic ICC-IF staining, while endogenous biotin or peroxidase may create background in testis with SABC/DAB detection (HPA: supported nucleoplasm localization and ICC-IF images; caption: testis, SABC/DAB; standard IHC practice).
HPA tissue IHC evidence for SMC6
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Uncertain — Medium 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 |
|---|---|---|---|---|
| Gallbladder | Glandular cells | Medium | Protein (IHC) | HPA → |
| Testis | Cells in seminiferous ducts | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Caudate | Glial cells | Not detected | Protein (IHC) | HPA → |
| Cerebellum | Cells in granular layer | Not detected | Protein (IHC) | HPA → |
| Cerebral cortex | Endothelial cells | Not detected | Protein (IHC) | HPA → |
| Hippocampus | Glial cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced SMC6 IHC Tips
These questions address SMC6 staining in paraffin sections with chromogenic IHC; the immunofluorescence entry covers the separate IF/ICC application.
How should I retrieve SMC6 antigen when nuclear staining is weak?
Use heat mediated antigen retrieval in citrate buffer at pH 6 for paraffin sections (datasheet A01554-1). The selected mouse testis image used 20 minutes of retrieval, providing a starting condition for this antibody (A01554-1 IHC caption). If nuclear staining remains weak, check deparaffinisation and primary antibody incubation, then vary retrieval time in small increments while keeping cooling consistent (standard IHC practice). Compare each condition with a matched no primary control and a reference section stained in the same run (standard IHC practice). Judge improvement by nuclear signal and preserved cell morphology, rather than DAB intensity alone (UniProt Q96SB8 localisation; standard IHC practice).
Can fixation explain weak or uneven SMC6 staining?
Target specific fixation sensitivity is unknown: the selected paraffin section caption does not report its fixative (A01554-1 IHC caption). Record the fixative, fixation duration, specimen thickness and processing history for each section before changing staining conditions (standard IHC practice). Compare sections processed alike when assessing weak signal, because processing differences can affect antigen access and tissue morphology (standard IHC practice). If archival blocks stain unevenly, examine a freshly cut reference section and review edge staining before adjusting antibody concentration (standard IHC practice). Do not infer a preferred fixative from tissue staining patterns or SMC6 topology; neither supplies fixation evidence (HPA tissue IHC; UniProt Q96SB8 topology).
Should SMC6 staining be nuclear, cytoplasmic or punctate?
Prioritise interpretable nuclear staining: SMC6 is annotated in the nucleus and on chromosomes, while supported ICC/IF localisation is nucleoplasmic (UniProt Q96SB8 localisation; HPA subcellular). Nuclear speckles and PML bodies are annotated locations, but a punctate IHC pattern alone does not establish either structure (UniProt Q96SB8 localisation; standard IHC practice). HPA reports cytoplasmic and nuclear expression in most tissues with Uncertain tissue staining reliability, so evaluate cytoplasmic DAB cautiously (HPA tissue IHC). Score nuclear and cytoplasmic compartments separately against no primary controls, preserving the cell level context of each section (standard IHC practice). Chromatin association supports examining nuclear detail, although DAB microscopy cannot prove chromatin binding (UniProt Q96SB8 localisation; standard IHC practice).
Could isoforms or epitope masking explain discrepant SMC6 staining?
SMC6 has 2 annotated isoforms, but the supplied antibody evidence does not identify its epitope or establish equal recognition of both (UniProt Q96SB8 isoforms; A01554-1 IHC caption). Consequently, do not assign a staining difference to a particular isoform from chromogenic IHC alone (UniProt Q96SB8 isoforms; standard IHC practice). A phosphoserine is annotated at residue 669, yet no supplied evidence links that modification to antibody binding (UniProt Q96SB8 modified residues; A01554-1 IHC caption). If staining varies after processing, repeat citrate retrieval at pH 6 under controlled conditions before invoking epitope masking (datasheet A01554-1; standard IHC practice). Document antibody identity and section processing when comparing results across experiments (standard IHC practice).
How can IF help resolve ambiguous SMC6 localisation?
For the separate IF/ICC application, use a validated marker for the cell population under study when multiplexing SMC6, and assess its nuclear relationship to the counterstain (standard IF practice; HPA subcellular). HPA supports nucleoplasmic localisation, providing a compartment reference for interpreting fluorescent signal (HPA subcellular). Choose spectrally separated fluorophores after checking tissue autofluorescence in unstained controls, especially when comparing weak nuclear signal with background (standard IF practice). Because SMC6 lacks a transmembrane segment and has nuclear localisation, permeabilise cells sufficiently to expose an intracellular nuclear epitope while preserving morphology (UniProt Q96SB8 topology and localisation; standard IF practice). Include single colour controls to assess bleed through before interpreting apparent colocalisation (standard IF practice).
What should I check when DAB staining is diffuse?
The selected IHC image used a biotinylated secondary antibody, an avidin biotin detection complex and DAB, so assess background at each detection stage (A01554-1 IHC caption). Run no primary and secondary only controls to distinguish nonspecific reagent staining from primary dependent signal (standard IHC practice). Block endogenous peroxidase before DAB development and assess endogenous biotin where an avidin biotin system is used (standard IHC practice). Compare nuclear staining with diffuse cytoplasmic deposit, section edges and damaged areas at the same development time (UniProt Q96SB8 localisation; standard IHC practice). If background persists, optimise blocking, washes and primary concentration one variable at a time (standard IHC practice).
How should I quantify SMC6 IHC across sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and nuclear scoring rule before reviewing experimental groups; SMC6 has supported nucleoplasmic localisation (HPA subcellular; standard IHC practice). Report the percentage of positive nuclei and, when intensity grading is reproducible, an H-score based on the proportions at each intensity (standard IHC practice). Normalise counts to the number of eligible intact nuclei, or report positive cell density per mm² of analysable tissue when area differs (standard IHC practice). Keep section thickness, retrieval, DAB development and imaging settings consistent across groups (standard IHC practice). Record cytoplasmic staining separately and exclude folds, necrosis and tissue edges using predefined criteria (HPA tissue IHC; standard IHC practice).
How do I distinguish convincing SMC6 staining from artefact?
Look for reproducible nuclear signal in intact cells, consistent with SMC6 nuclear localisation and supported nucleoplasmic ICC/IF staining (UniProt Q96SB8 localisation; HPA subcellular). The HPA reports medium staining in cells of testis seminiferous ducts, but rates its tissue IHC reliability Uncertain; treat that pattern as context rather than proof (HPA tissue IHC). Compare suspect cytoplasmic signal, tissue edge staining and necrotic areas with matched no primary controls (standard IHC practice). Check whether DAB persists when the primary is omitted, since endogenous peroxidase or detection chemistry can produce misleading colour (standard IHC practice). Do not identify PML bodies or DNA repair sites solely from brown nuclear puncta (UniProt Q96SB8 localisation; standard IHC practice).
Boster reagents
Best SMC6 / Structural maintenance of chromosomes protein 6 IHC Antibodies
Both catalog antibodies have IHC images from paraffin sections and IF images from cells (catalog image captions); the IHC images cover human breast cancer and human, mouse, and rat testis (catalog IHC image captions).
Real IHC data
Anti-SMC6L1 Antibody ®
Cat # A01554-1
Real IHC data
Anti-SMC6 Antibody ®
Cat # A01554-2
A01554-1 has paraffin-section IHC images from mouse, rat, and human testis, plus an IF image from A431 cells (A01554-1 image captions). A01554-2 has a paraffin-section IHC image from human breast cancer, plus IF images from A549 cells and a human breast cancer section (A01554-2 image captions).
Which to pick: For human breast cancer paraffin IHC, choose A01554-2, whose IHC image shows that sample; its fixative is unreported (A01554-2 IHC caption). For IF/ICC, A01554-2 has images from A549 cells and a human breast cancer section, while A01554-1 has an image from A431 cells (catalog IF captions; catalog application lists). For cross-species paraffin IHC, choose A01554-1: its images cover human, mouse, and rat testis, and its listed reactivity includes all three species; its fixative is unreported (A01554-1 IHC captions; catalog reactivity).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q96SB8 (SMC6_HUMAN, Structural maintenance of chromosomes protein 6).
- Human Protein Atlas. SMC6 tissue IHC expression (reliability: Uncertain).
- Human Protein Atlas. SMC6 subcellular location (ICC-IF): Localized to the nucleoplasm..
- Human Protein Atlas. SMC6 antibody validation summary (3 antibodies).
- Role for rodent Smc6 in pericentromeric heterochromatin domains during spermatogonial differentiation and meiosis. Cell death & disease 2013 — PMC3763431.
- SMC6 expression & outcome of breast cancer. The Indian journal of medical research 2025 — PMC12826375.
- PubMed PMID:11408570 — UniProt-cited evidence.
- PubMed PMID:11230166 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for SMC6 (Structural maintenance of chromosomes protein 6). Expected localisation Nucleus (UniProt); nuclear and cytoplasmic tissue staining (HPA tissue IHC). Antigen retrieval: Citrate pH 6 HIER, heat-mediated (datasheet A01554-1). Validated IHC antibody: A01554-1 at 0.5-1μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Gallbladder (Glandular cells); negative Adipose tissue. IHC workflow; specimen preparation unspecified. Protocol steps: 1. Sample: Paraffin-embedded mouse testis tissue; fixative not specified (datasheet A01554-1); 2. Fixation: Image fixative and duration unreported (datasheet A01554-1); 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: Citrate pH 6 , 20 min (datasheet A01554-1); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A01554-1); 8. Primary antibody: Rabbit anti-SMC6, 0.5-1μg/ml (datasheet A01554-1); 9. Primary incubation: Overnight at 4 °C (datasheet A01554-1). Watch for: Fixation: Keep fixation consistent across sections (standard IHC practice; not target-specific); Caveat: Tissue staining reliability is uncertain (HPA tissue IHC); Isoform / epitope: Two isoforms; epitope differences are unreported (UniProt); Regulation: Strong expression in testis (UniProt). Evidence: UniProt Q96SB8, HPA tissue IHC · Uncertain, HPA ICC-IF · nucleoplasm., Datasheet A01554-1, PMC3763431, PMC12826375. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/SMC6/immunohistochemistry-ihc-guide.