FSCN1 / Fascin · IHC design guide

Design Immunohistochemistry for FSCN1

Plan FSCN1 paraffin IHC around cytoplasmic staining in glia, endothelium, fibroblasts and macrophages (HPA tissue IHC). Start with the catalog antibody at 1:50 (datasheet M02147-1) and score cell populations separately (HPA tissue IHC).

Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use

Immunohistochemistry protocol sheet for FSCN1 (IHC for FSCN1): expected localisation Cytoplasm in tissue cells (HPA tissue IHC), antibody M02147-1, validated IHC image, and IHC protocol steps — Printable **FSCN1** IHC protocol sheet — expected localisation Cytoplasm in tissue cells (HPA tissue IHC), antibody M02147-1, controls and protocol steps. Open the full FSCN1 IHC guide →

Navigate to: Protocols Staining pattern Controls Antibodies

FSCN1 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	Cytoplasm in tissue cells (HPA tissue IHC)
	Staining pattern	Cytoplasmic in glia, endothelium, fibroblasts and macrophages (HPA tissue IHC)
	Antigen retrieval	EDTA pH 8.0 HIER, heat-mediated (datasheet M02147-1)
	Positive control ⓘ	Breast+4 more · see all
	Negative control ⓘ	Bronchus+4 more · see all

Important caveats

Reasons your staining may differ from the expected pattern.

	Fixation	Keep fixation consistent across paraffin sections. (standard IHC practice; not target-specific)
	Caveat	Macrophage and endothelial staining can confound scoring (HPA tissue IHC)
	Regulation	Regulation not specified (UniProt)
	Isoform / epitope	No annotated isoforms; cytoplasmic protein without a transmembrane segment (UniProt)

Section 1

Recommended FSCN1 IHC & IF Protocols

The catalog antibody’s IHC-P protocol (datasheet: M02147-1) is accompanied by four published FSCN1 IHC protocols (PMC2833258; PMC13243165; PMC13461984; PMC6494834).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Paraffin-embedded human tonsil tissue; fixative not specified (datasheet M02147-1)
Fixation	Image fixative and duration unreported (datasheet M02147-1); 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 M02147-1); 20 min, 95–100 °C (standard)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% goat serum (datasheet M02147-1)
Primary antibody	Rabbit monoclonal (clone ADOA-6) anti-FSCN1, 1:50 (datasheet M02147-1)
Primary incubation	Overnight at 4 °C (datasheet M02147-1)
Detection	HRP-conjugated secondary, DAB chromogen (datasheet M02147-1)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	FSCN1-positive staining in glandular cells of breast (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in cells in seminiferous tubules, glial cells, endothelial cells, fibroblasts and macrophages. No signal in the no-primary control.

💡Decision noteStart with heat-mediated EDTA retrieval at pH 8.0 (datasheet: M02147-1); the sarcoma protocol also specifies EDTA retrieval (PMC13243165).

Section 2

What Is the Expected FSCN1 Staining Pattern?

FSCN1 is a cytosolic and actin-associated protein with no transmembrane segment (UniProt Q16658 topology and subcellular location). In paraffin-section IHC, expect cytoplasmic staining in selected cells, including glial cells, endothelial cells, fibroblasts and macrophages (HPA: tissue IHC profile). HPA rates the tissue staining pattern Enhanced, supported by agreement with RNA expression and similar staining from paired antibodies (HPA: reliability description).

What am I looking at on my slide?
Clear cytoplasmic staining in glial cells, endothelial cells or macrophages.	This fits the reported cellular pattern (HPA: tissue IHC profile). Assess the identified cells, rather than calling the entire tissue positive; neighboring cell types can differ.
Strong signal in breast glandular cells, lung endothelial cells or testis Sertoli cells.	Each is reported High in the named cell population (HPA: tissue IHC). A positive result should preserve recognizable cell boundaries and tissue structure (general IHC practice).
Predominantly nuclear staining, with little cytoplasmic signal.	A nuclear-dominant pattern conflicts with FSCN1's reported cytosolic and cytoskeletal locations (UniProt Q16658: subcellular location). Treat it as suspect and compare controls before scoring.
Strong glandular staining in duodenum or gallbladder.	Those named glandular cells are reported Not detected (HPA: tissue IHC). Unexpected signal may reflect cross-reactivity or endogenous detection activity; it does not make every cell in those tissues a negative control.
Haze across cells, stroma and blank areas, or no staining in a known-positive cell population.	Diffuse haze lacks the cell-restricted pattern reported by HPA (HPA: tissue IHC profile). Absent staining in a High population, such as lung endothelial cells, makes the run or section worth checking (HPA: tissue IHC).

💡Expected FSCN1 appearanceCall a section positive when identifiable cells show clear cytoplasmic staining, potentially High in the specified HPA populations (HPA: tissue IHC); dominant nuclear color or broad, cell-independent haze is suspect against the reported localization (UniProt Q16658: subcellular location; HPA: tissue IHC profile).

How each factor affects the staining
Cell identity within the section	HPA reports High staining in kidney glomerular cells but Not detected in bronchial respiratory epithelium (HPA: tissue IHC). Score the named cells separately; a tissue name alone does not predict every cell's result.
Localization and topology	UniProt places FSCN1 in cytosol, cortex, cytoskeleton and projections, and reports no transmembrane segment (UniProt Q16658: subcellular location and topology). A membrane-edge accent may accompany cellular staining; membrane-only IHC is not established by the tissue profile.
Confidence in the reference pattern	The tissue pattern is rated Enhanced, with RNA agreement and similar paired-antibody staining (HPA: reliability description). Several listed antibodies have Enhanced IHC status (HPA: antibody validation); that supports the reference pattern, not every result from an unlisted reagent.
What should IF/ICC show?	HPA supports cytosolic localization and marks plasma membrane localization uncertain in ICC-IF (HPA: subcellular summary and main location). Interpret IF/ICC on its own guide page; the uncertain membrane assignment should not override the cytoplasmic tissue-IHC pattern.
Processing and epitope limits	UniProt reports no signal peptide or propeptide and lists a 2–493 fascin chain (UniProt Q16658: processing). The supplied record does not map the IHC epitope or establish FSCN1-specific retrieval or fixation sensitivity; optimize those steps as general IHC workflow variables.

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
No signal in a section expected to be positive.	The wrong cells may have been assessed, or the IHC run may have failed; breast glandular cells are reported High (HPA: tissue IHC).	Locate the named positive population first. Check a known-positive section, antibody incubation, detection reagents and counterstain using general IHC practice.
The whole slide has a weak brown haze.	Widespread color does not match HPA's cell-specific cytoplasmic profile (HPA: tissue IHC); nonspecific binding or detection background is possible.	Compare a no-primary control, inspect blank areas, and adjust blocking, washing or detection conditions as general IHC practice.
Duodenal glandular cells stain strongly.	That cell population is reported Not detected (HPA: tissue IHC); cross-reactivity or endogenous detection activity is possible.	Confirm cell identity and compare a no-primary control. Check endogenous enzyme blocking where relevant to the chromogenic system (general IHC practice).
Color is mainly nuclear.	Nuclear-dominant signal conflicts with the reported cytosolic and cytoskeletal locations (UniProt Q16658: subcellular location).	Review morphology and counterstain, then compare positive and no-primary controls. Reassess antibody specificity before counting nuclei as FSCN1-positive.
Signal is unexpectedly weak after a retrieval change.	Retrieval conditions can affect IHC performance in general; FSCN1-specific fixation or retrieval sensitivity is unreported in the supplied sources.	Compare retrieval conditions on matched sections with the same positive control (general IHC practice). Do not attribute the change to a mapped FSCN1 epitope.
IF/ICC highlights a cell edge more than cytosol.	HPA lists plasma membrane localization as uncertain and cytosol as supported in ICC-IF (HPA: subcellular main location).	Evaluate the IF/ICC controls and localization separately. For this IHC section, judge positivity against the cytoplasmic tissue pattern (HPA: tissue IHC profile).

Source: UniProt Q16658 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing FSCN1 staining

IHC analysis of Fascin using anti-Fascin antibody (M02147-1). Fascin was detected in a paraffin-embedded section of human tonsil tissue. Heat mediated antigen retrieval was performed in EDTA buffer (pH 8.0, epitope retrieval solution). The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 1:50 rabbit anti-Fascin Antibody (M02147-1) overnight at 4°C. Peroxidase Conjugated Goat Anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using HRP Conjugated Rabbit IgG Super Vision Assay Kit (Catalog # SV0002) with DAB as the chromogen.

M02147-1 · IHCIHC analysis of Fascin using anti-Fascin antibody (M02147-1). Fascin was detected in a paraffin-embedded section of human tonsil tissue. Hea

IHC analysis of Fascin using anti-Fascin antibody (M02147-1). Fascin was detected in a paraffin-embedded section of mouse spleen tissue. Heat mediated antigen retrieval was performed in EDTA buffer (pH 8.0, epitope retrieval solution). The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 1:50 rabbit anti-Fascin Antibody (M02147-1) overnight at 4°C. Peroxidase Conjugated Goat Anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using HRP Conjugated Rabbit IgG Super Vision Assay Kit (Catalog # SV0002) with DAB as the chromogen.

M02147-1 · IHCIHC analysis of Fascin using anti-Fascin antibody (M02147-1). Fascin was detected in a paraffin-embedded section of mouse spleen tissue. Hea

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000075618-FSCN1/tissue/cerebral+cortex#imid_19670643

HPA · CerebellumHuman Protein Atlas IHC, Cerebellum. Source: https://www.proteinatlas.org/ENSG00000075618-FSCN1/tissue/cerebellum#imid_19670630

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000075618-FSCN1/tissue/colon#imid_19670553

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000075618-FSCN1/tissue/liver#imid_19670554

HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody CAB035991; green = FSCN1, blue = nucleus, red = microtubules.

← swipe / scroll for more images →

Real IHC / IF data behind the staining-pattern expectations in this section.

Sample controls for FSCN1 IHC & IF

🧪Run breast first: glandular cells should stain strongly (HPA: High in breast glandular cells). Use duodenal glandular cells as the negative tissue (HPA: Not detected in duodenal glandular cells); on the breast slide, assess background in cells without visible signal, but do not presume a named internal cell population is negative because HPA identifies only the positive glandular cells.

Positive control tissue: Breast (Glandular cells, HPA High)

Negative control tissue: Bronchus (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show FSCN1 in A-431, U-251MG, U2OS, THP-1, with annotated localisation: Plasma membrane (uncertain), Cytosol (supported) (HPA subcellular).

Technical controls: Include a no-primary (secondary-only) control, a concentration-matched rabbit IgG isotype control, and FSCN1-knockout tissue or cells as a biological negative (selected-SKU caption: rabbit primary; standard IHC practice). For chromogenic breast sections, quench endogenous peroxidase and check for residual signal before interpreting DAB staining (selected-SKU caption: peroxidase/DAB detection; standard IHC practice).

⚠️Feasibility: The target-specific fixation window and fixation effect are unreported, and the exact M02147-1 tissue-IHC caption does not state the fixative (selected-SKU caption: fixative unreported). The demonstrated paraffin-section method used heat retrieval in EDTA at pH 8.0, but the evidence does not establish whether retrieval is required under other conditions (selected-SKU caption: EDTA retrieval). No supplied comparison establishes whether frozen sections or IF/ICC are easier; in breast sections, residual endogenous peroxidase can confound DAB interpretation (standard IHC practice).

HPA tissue IHC evidence for FSCN1

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — High consistency between antibody staining and RNA expression data. Antibody staining in cells/structures not annotated, view images. Paired antibodies with high similarity supports the protein expression pattern.). 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
Breast	Glandular cells	High	Protein (IHC)	HPA →
Caudate	Glial cells	High	Protein (IHC)	HPA →
Cerebellum	Processes in white matter	High	Protein (IHC)	HPA →
Cerebral cortex	Glial cells	High	Protein (IHC)	HPA →
Kidney	Cells in glomeruli	High	Protein (IHC)	HPA →

Undetected expression · recommended negative controls

Tissue	Cell type	Level	Evidence	Source
Bronchus	Respiratory epithelial cells	Not detected	Protein (IHC)	HPA →
Duodenum	Glandular cells	Not detected	Protein (IHC)	HPA →
Epididymis	Glandular cells	Not detected	Protein (IHC)	HPA →
Fallopian tube	Glandular cells	Not detected	Protein (IHC)	HPA →
Gallbladder	Glandular cells	Not detected	Protein (IHC)	HPA →

Section 3

Advanced FSCN1 IHC Tips

Troubleshoot FSCN1 staining in paraffin sections using the catalog antibody’s tonsil result, expected cellular localisation and cell type controls (catalog antibody M02147-1; UniProt Q16658; HPA tissue IHC).

Which retrieval conditions should I try first for weak FSCN1 staining?

Start with heat mediated retrieval in EDTA at pH 8.0 for paraffin sections (catalog antibody M02147-1 tissue IHC caption). The documented tonsil workflow then used 10% goat serum, primary antibody at 1:50 overnight at 4°C, and a peroxidase secondary for 30 minutes at 37°C (catalog antibody M02147-1 tissue IHC caption). If signal is weak, check heating, section coverage and reagent performance before changing retrieval conditions (standard IHC practice). Compare any retrieval adjustment on adjacent sections against the documented condition, scoring cytoplasmic signal in the same cell population alongside tissue damage and background (UniProt Q16658 subcellular; standard IHC practice).

Could fixation explain weak or patchy FSCN1 staining?

Target specific FSCN1 sensitivity to fixation is unknown because the selected paraffin section caption does not state a fixative (catalog antibody M02147-1 tissue IHC caption). Record each specimen’s fixative and fixation interval, then compare similarly processed sections using the documented EDTA retrieval at pH 8.0 (catalog antibody M02147-1 tissue IHC caption; standard IHC practice). If staining varies between blocks, examine section integrity and compare a positive control from the same run before changing antibody concentration or retrieval (standard IHC practice). The tonsil result used 1:50 primary overnight at 4°C, but it cannot establish a preferred fixative for FSCN1 (catalog antibody M02147-1 tissue IHC caption).

Where should convincing FSCN1 staining appear in tissue sections?

Expect predominantly cytoplasmic and cortical staining rather than a nuclear pattern, consistent with FSCN1’s cytosol, cell cortex, cytoskeleton and cell projection annotations (UniProt Q16658 subcellular). HPA reports cytoplasmic tissue staining and high signal in tonsil squamous epithelial cells, lung endothelial cells and testis Sertoli cells (HPA tissue IHC). Assess the relevant cell population at matched magnification and distinguish its cytoplasm from adjacent stroma, vessels and overlapping processes (HPA tissue IHC; standard IHC practice). If a section shows only nuclear staining or diffuse staining across every compartment, review the negative control and the documented pH 8.0 retrieval run before calling it FSCN1 positive (UniProt Q16658 subcellular; catalog antibody M02147-1 tissue IHC caption; standard IHC practice).

Can isoforms or epitope position explain an unexpected staining pattern?

The supplied UniProt record lists 0 isoforms, no transmembrane segment and a Fascin chain spanning residues 2–493 (UniProt Q16658 isoforms, topology and processing). It also lists modified residues, including phosphoserines at 38, 39 and 127, but the selected caption does not identify the antibody epitope (UniProt Q16658 modified residues; catalog antibody M02147-1 tissue IHC caption). Do not assign a staining difference to an isoform or modification without epitope information and a matched validation experiment (standard IHC practice). First compare expected cytoplasmic staining with the documented pH 8.0 retrieval condition and a same run control (UniProt Q16658 subcellular; catalog antibody M02147-1 tissue IHC caption; standard IHC practice).

How should I adapt the FSCN1 tissue result for multiplex IF?

Treat multiplex IF as a separate optimisation because the selected antibody evidence is chromogenic staining of a paraffin tonsil section (catalog antibody M02147-1 tissue IHC caption). Pair FSCN1 with a validated marker for the cell population under study; HPA reports high tonsil squamous epithelial and lung endothelial staining as possible cell type checks (HPA tissue IHC; standard IF practice). Choose fluorophores after measuring tissue autofluorescence and include single stain controls to check channel bleed through (standard IF practice). Because FSCN1 lacks a transmembrane segment and is annotated in the cytosol and cortex, use permeabilisation appropriate for an intracellular epitope, while recognising that this antibody’s epitope is unspecified (UniProt Q16658 topology and subcellular; catalog antibody M02147-1 tissue IHC caption; standard IF practice).

How can I reduce diffuse DAB background without losing FSCN1 signal?

Begin by comparing a no primary control with a positive section in the same staining run to locate background from detection reagents or tissue (standard IHC practice). The documented workflow used 10% goat serum before 1:50 primary antibody overnight at 4°C, followed by peroxidase detection and DAB (catalog antibody M02147-1 tissue IHC caption). For unexplained brown deposits, check the general peroxidase blocking and washing steps, then shorten DAB development or titrate the primary while preserving the positive control (standard IHC practice). Score staining in defined cells and compartments, since HPA also reports FSCN1 in endothelial cells, fibroblasts and macrophages that may contribute genuine nearby signal (HPA tissue IHC).

How should I quantify FSCN1 across heterogeneous paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population and region before scoring, since HPA reports FSCN1 in several tissue cell types, including endothelial cells, fibroblasts and macrophages (HPA tissue IHC; standard IHC practice). For chromogenic sections, report an H score combining staining intensity and percentage of positive cells, or report percentage positive cells within that defined population (standard IHC practice). For spatial analyses, count positive cells per mm² of viable, evaluable tissue and report the sampled area and number of sections (standard IHC practice). Keep retrieval at pH 8.0 and acquisition settings consistent, and normalise comparisons to the same cell population and evaluable area rather than whole section DAB intensity (catalog antibody M02147-1 tissue IHC caption; standard IHC practice).

What distinguishes true FSCN1 positivity from a staining artefact?

Look for cytoplasmic or cortical staining in identifiable cells, consistent with FSCN1 localisation and HPA’s cytoplasmic tissue profile (UniProt Q16658 subcellular; HPA tissue IHC). A plausible control is the documented tonsil section, while HPA reports high staining in tonsil squamous epithelial cells and no detection in bronchus respiratory epithelial cells (catalog antibody M02147-1 tissue IHC caption; HPA tissue IHC). Treat isolated nuclear staining, section edge enhancement and staining over necrotic areas cautiously, and compare them with a no primary control (UniProt Q16658 subcellular; standard IHC practice). Brown signal persisting without primary antibody warrants review of endogenous enzyme blocking and DAB development before assigning FSCN1 positivity (standard IHC practice).

Boster reagents

Best FSCN1 / Fascin IHC Antibodies

M02147-1 has IHC images from paraffin-embedded human tonsil, mouse spleen, and rat spleen (catalog IHC captions). IF/ICC is listed, but no IF image is supplied (catalog applications; IF image payload).

Real IHC data

Anti-Fascin Monoclonal Antibody

Cat # M02147-1

View product →

M02147-1 will render with its human tonsil IHC figure from a paraffin-embedded section (card figure caption). Its other IHC captions show paraffin-embedded mouse and rat spleen; the catalog lists human, mouse, and rat reactivity and IF/ICC applications (catalog IHC captions; applications; reactivity).

Which to pick: For tissue IHC, choose M02147-1: its rabbit monoclonal clone ADOA-6 has IHC images from paraffin-embedded sections, and the human tonsil caption reports EDTA retrieval at pH 8.0 and a 1:50 primary dilution (catalog clone; IHC captions). For IF/ICC, M02147-1 is the listed option at 1:50, though no IF image is supplied (catalog applications; IF dilution; IF image payload). For human, mouse, or rat work, M02147-1 lists all three species and has an IHC caption for each; the captions do not report the fixative (catalog reactivity; IHC captions).

Each figure is that product's own IHC / IF validation image from its datasheet.

References

UniProt Consortium. UniProt entry Q16658 (FSCN1_HUMAN, Fascin).
Human Protein Atlas. FSCN1 tissue IHC expression (reliability: Enhanced).
Human Protein Atlas. FSCN1 subcellular location (ICC-IF): Mainly localized to the plasma membrane and cytosol..
Human Protein Atlas. FSCN1 antibody validation summary (5 antibodies).
miR-145 and miR-133a function as tumour suppressors and directly regulate FSCN1 expression in bladder cancer. British journal of cancer 2010 — PMC2833258.
FSCN1 drives sarcoma progression and immunosuppression revealed by pan-cancer analysis and functional assays. Discover oncology 2026 — PMC13243165.
Fascin-1 expression in non-small cell lung cancer and its diagnostic implications. Discover oncology 2026 — PMC13461984.
FSCN1 is an effective marker of poor prognosis and a potential therapeutic target in human tongue squamous cell carcinoma. Cell death & disease 2019 — PMC6494834.
PubMed PMID:8068206 — UniProt-cited evidence.
PubMed PMID:7933116 — UniProt-cited evidence.
PubMed PMID:14702039 — UniProt-cited evidence.