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CXXC5 / CXXC-type zinc finger protein 5 · IHC design guide
Design Immunohistochemistry for CXXC5
Plan CXXC5 staining in paraffin sections using the reported cytoplasmic tissue pattern and documented positive cell populations (HPA tissue IHC). The guide covers fixation, antibody concentration, chromogenic detection, and interpretation of nuclear signal in light of its annotated molecular location (UniProt).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
CXXC5 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 | Tissue IHC: cytoplasm; molecularly: nucleus and cytoplasm (HPA tissue IHC; UniProt) | |
| Staining pattern | Cytoplasmic staining in several tissues, including neuronal cells (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A06865-1) | |
| Positive control | Cerebral cortex+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 paraffin-section fixation consistent across samples. (standard IHC practice; not target-specific) | |
| Caveat | Tissue staining has medium agreement with RNA expression (HPA tissue IHC) | |
| Regulation | Expression regulation not annotated (UniProt) | |
| Isoform / epitope | 2 isoforms; epitope coverage is unspecified (UniProt) |
Section 1
Recommended CXXC5 IHC & IF Protocols
Compare the catalog antibody’s IHC-P protocol with two published chromogenic CXXC5 IHC methods (PMC9712602; PMC6458850).
| Sample | Paraffin-embedded mouse brain tissue; fixative not specified (datasheet A06865-1) |
| Fixation | Image fixative and duration unreported (datasheet A06865-1); 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 A06865-1); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A06865-1) |
| Primary antibody | Rabbit anti-CXXC5, 2-5 μg/ml (datasheet A06865-1) |
| Primary incubation | Overnight at 4 °C (datasheet A06865-1) |
| Detection | HRP-conjugated secondary, DAB chromogen (datasheet A06865-1) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | CXXC5-positive staining in neuronal cells of cerebral cortex (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 the catalog antibody (datasheet: A06865-1); citrate pH 6.0 is a published alternative (PMC9712602; PMC6458850).
Section 2
What Is the Expected CXXC5 Staining Pattern?
CXXC5 is found in the nucleus and cytoplasm and has no transmembrane segment (UniProt Q7LFL8). In paraffin sections, expect mainly cytoplasmic staining in selected cells, especially cerebral cortex neurons and testis Leydig cells, where staining is high (HPA tissue IHC). Treat this as a guide to interpretation: HPA rates tissue IHC staining Approved, with medium consistency between staining and RNA expression (HPA tissue IHC).
| Strong cytoplasmic staining in cerebral cortex neurons or testis Leydig cells, with identifiable cell boundaries and little surrounding deposit. | This matches the reported high staining in those cell types and HPA's mainly cytoplasmic tissue profile (HPA tissue IHC). Compare cells within the same section before assigning intensity. |
| Predominantly sharp staining along cell surfaces, in extracellular space, or across tissue structures without a cellular pattern. | These are poor matches for a protein reported in nucleus and cytoplasm, with no transmembrane segment (UniProt Q7LFL8). Check for a detection artefact; nuclear signal alone remains plausible because nucleoplasm is supported in ICC-IF (HPA subcellular). |
| Strong staining in adipocytes, lung alveolar cells, or lymph node germinal center cells. | HPA reports CXXC5 as not detected in those cell populations (HPA tissue IHC). Investigate cross-reactivity or endogenous detection activity before calling the signal CXXC5; an HPA negative observation does not establish absolute absence. |
| Diffuse chromogen covers both cells and surrounding tissue, obscuring cell boundaries and the expected distribution. | The pattern cannot be scored confidently against HPA's cell-specific observations (HPA tissue IHC). Review background controls and detection conditions using general IHC practice before interpreting intensity. |
| No staining in cerebral cortex neurons or testis Leydig cells on an otherwise interpretable section. | These are high-staining reference populations (HPA tissue IHC). First check tissue identity and assay controls, then troubleshoot the IHC workflow; a failed reference does not establish that CXXC5 is absent from the test sample. |
💡Expected CXXC5 appearanceCall a positive IHC result when discrete, mainly cytoplasmic staining is high in cerebral cortex neurons or testis Leydig cells (HPA tissue IHC); widespread surface or extracellular deposit is suspect given CXXC5's nuclear/cytoplasmic location and lack of a transmembrane segment (UniProt Q7LFL8).
| Compartment and assay context | Tissue IHC is described as cytoplasmic in several tissues (HPA tissue IHC), while nucleoplasm is the supported main ICC-IF location and cytosol is uncertain (HPA subcellular). Interpret compartment claims within the assay used. |
| Cell population and reference intensity | Cerebral cortex neurons and testis Leydig cells stain high; breast and colon glandular cells stain medium (HPA tissue IHC). Choose reference cells by their recorded staining level, not tissue name alone. |
| Strength of validation | HPA labels the tissue profile Approved and reports medium staining-to-RNA consistency (HPA tissue IHC). Its listed IHC antibody HPA036508 is Approved; the listed ICC antibody HPA058148 is Supported for ICC (HPA antibodies). |
| Isoforms and antibody recognition | UniProt lists two CXXC5 isoforms (UniProt Q7LFL8). The supplied records do not map the catalog antibody's epitope or establish which isoforms it detects, so isoform-specific staining cannot be inferred. |
| IF/ICC Q: Should fluorescence match tissue IHC exactly? | A: No exact compartment match is established by these records. Nucleoplasm is supported and cytosol uncertain in ICC-IF (HPA subcellular); tissue IHC is described as cytoplasmic (HPA tissue IHC). |
| Situation | Likely cause | Next action |
|---|---|---|
| A known high-staining reference shows no chromogen. | The expected reference signal may have failed, or the selected cells may be missing; cortex neurons and Leydig cells are reported high (HPA tissue IHC). | Confirm the cell population, then check positive and reagent controls, retrieval, antibody application, and detection steps (general IHC practice). |
| A membrane-like rim dominates otherwise well-preserved cells. | A surface-dominant result conflicts with the recorded nucleus/cytoplasm distribution and absence of a transmembrane segment (UniProt Q7LFL8). | Inspect a no-primary control and repeat with the validated IHC conditions before treating the rim as target staining (general IHC practice). |
| Adipocytes or alveolar cells stain as strongly as the positive reference. | Those cell types are reported as not detected in HPA tissue IHC (HPA tissue IHC); cross-reactivity or endogenous detection activity is possible. | Compare matched negative controls and evaluate the detection system's endogenous activity controls (general IHC practice). |
| Weak stain is spread evenly through many unrelated cells. | A uniform haze does not reproduce HPA's reported cell-specific intensity differences (HPA tissue IHC); nonspecific background is possible. | Review no-primary controls, blocking, wash steps, and detection development; score only resolved cellular staining (general IHC practice). |
| Nuclear signal appears alongside cytoplasmic signal. | Nuclear localization is consistent with UniProt, and nucleoplasm is supported in ICC-IF, although HPA tissue IHC describes a cytoplasmic profile (UniProt Q7LFL8; HPA subcellular; HPA tissue IHC). | Record nuclear and cytoplasmic staining separately; compare the tissue pattern with controls before assigning specificity (general IHC practice). |
| Two sections give different staining intensity. | HPA records different levels across cell populations, including high cortex neurons and medium caudate neurons (HPA tissue IHC); the records do not establish a CXXC5-specific fixation effect. | Confirm that the same cell population is being compared and review section and run controls (general IHC practice). |
Experiment evidence
IHC & IF images showing CXXC5 staining
A06865-1 · IHCIHC analysis of CXXC5 using anti-CXXC5 antibody (A06865-1). CXXC5 was detected in a paraffin-embedded section of mouse brain tissue. Heat me
A06865-1 · IHCIHC analysis of CXXC5 using anti-CXXC5 antibody (A06865-1). CXXC5 was detected in a paraffin-embedded section of mouse brain tissue. Heat me
A06865 · IHCImmunohistochemistry of CXXC5 in human brain tissue with CXXC5 antibody at 2.5 μg/mL.
A06865 · IFImmunofluorescence of CXXC5 in Human Brain tissue with CXXC5 antibody at 20 μg/mL.
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000171604-CXXC5/tissue/cerebral+cortex#imid_8882396
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000171604-CXXC5/tissue/colon#imid_8882330
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000171604-CXXC5/tissue/liver#imid_8882323
HPA · PancreasHuman Protein Atlas IHC, Pancreas. Source: https://www.proteinatlas.org/ENSG00000171604-CXXC5/tissue/pancreas#imid_8882282
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA058148; green = CXXC5, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA058148; green = CXXC5, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for CXXC5 IHC & IF
🧪Run cerebral cortex first and expect staining in neuronal cells (HPA: High in cerebral cortex neuronal cells); use adipose tissue as the negative tissue, focusing on adipocytes (HPA: Not detected in adipocytes). On the cortex slide, cells without neuronal staining should remain at background, although the supplied HPA row does not identify a specific internal negative cell type (HPA: High in cerebral cortex neuronal cells).
Positive control tissue: Cerebral cortex (Neuronal cells, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show CXXC5 in A-431, U-251MG, U2OS, with annotated localisation: Nucleoplasm (supported) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only control, a matched rabbit IgG isotype control (selected-SKU caption: rabbit primary antibody), and CXXC5-knockout material as a biological negative (standard IHC practice). For HRP/DAB staining, quench endogenous peroxidase and inspect background in the cortex section (selected-SKU caption: HRP/DAB; standard IHC practice).
⚠️Feasibility: No target-specific fixation window or fixation effect is reported, and the selected paraffin-section caption does not state a fixative (selected-SKU caption: fixative unreported). The caption uses heat retrieval in EDTA at pH 8.0, but does not establish whether retrieval is required; the supplied evidence also does not establish whether frozen sections or IF/ICC are easier (selected-SKU caption: EDTA retrieval; HPA: ICC-IF images available). Cortical lipofuscin can produce autofluorescence in IF, so check an unstained or no-primary section before interpreting fluorescence (standard brain IF practice).
HPA tissue IHC evidence for CXXC5
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — 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 |
|---|---|---|---|---|
| Cerebral cortex | Neuronal cells | High | Protein (IHC) | HPA → |
| Testis | Leydig cells | High | Protein (IHC) | HPA → |
| Breast | Glandular cells | Medium | Protein (IHC) | HPA → |
| Caudate | Neuronal cells | Medium | Protein (IHC) | HPA → |
| Cervix | Squamous epithelial cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Lung | Alveolar cells | Not detected | Protein (IHC) | HPA → |
| Lymph node | Germinal center cells | Not detected | Protein (IHC) | HPA → |
| Ovary | Ovarian stroma cells | Not detected | Protein (IHC) | HPA → |
| Parathyroid gland | Glandular cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced CXXC5 IHC Tips
Troubleshoot CXXC5 staining in paraffin sections by checking retrieval, compartment patterns, cell identity and controls before comparing signal intensity.
Which retrieval conditions should I use when CXXC5 staining is weak in paraffin sections?
Start with heat-mediated retrieval in EDTA buffer at pH 8.0 (datasheet A06865-1). The selected paraffin-section image used that retrieval before an overnight incubation at 4°C with 2 μg/mL catalog antibody (datasheet A06865-1). If staining remains weak, compare a longer heating interval or a citrate-buffer condition on adjacent sections while holding detection and imaging conditions constant (standard IHC practice). Include neuronal cells in cerebral cortex as a tissue control because their staining is reported as high (HPA: High in cerebral cortex neuronal cells). Judge any retrieval change by signal within intact cells and by background, since tissue-edge staining alone can mislead (standard IHC practice).
Could fixation explain weak or uneven CXXC5 staining?
The selected image identifies a paraffin-embedded mouse brain section but does not state its fixative, so target-specific fixation sensitivity is unknown (datasheet A06865-1). Record the fixative, fixation duration and tissue thickness for each specimen before attributing differences in signal to CXXC5 biology (standard IHC practice). Compare similarly processed sections using the documented EDTA retrieval at pH 8.0 and 2 μg/mL primary incubation overnight at 4°C (datasheet A06865-1). Inspect morphology and staining penetration across the section, including its centre and edges (standard IHC practice). A consistent control section helps distinguish a processing problem from specimen variation, but the available evidence establishes no CXXC5-specific fixation window (standard IHC practice; datasheet A06865-1).
Should CXXC5 appear in nuclei or cytoplasm in chromogenic sections?
Assess nuclear and cytoplasmic staining separately: CXXC5 is annotated in both compartments, while tissue IHC reports cytoplasmic expression in several tissues (UniProt Q7LFL8 subcellular location; HPA: tissue IHC profile). Cell-based imaging places CXXC5 mainly in the nucleoplasm and additionally in the cytosol, with the latter assignment uncertain (HPA: subcellular location). Its reported colocalisation with DVL1 in bodies just outside the nuclear membrane can inform review of discrete perinuclear signal, although it does not validate a particular tissue pattern (UniProt Q7LFL8 subcellular location). Use the counterstain to outline nuclei and score each compartment in intact cells rather than treating diffuse chromogen as nuclear staining (standard IHC practice). Compare morphology and cell identity before calling an unexpected compartment a biological change (standard IHC practice).
Can this stain distinguish CXXC5 isoforms or reveal epitope masking?
CXXC5 has 2 annotated isoforms, but the supplied evidence does not map the catalog antibody's epitope or establish isoform-specific detection (UniProt Q7LFL8 isoforms; datasheet A06865-1). Treat a positive chromogenic signal as CXXC5-associated staining without assigning it to isoform 1 or 2 (UniProt Q7LFL8 isoforms; standard IHC interpretation). The protein has no annotated transmembrane segment and includes a reported phosphothreonine at residue 53; neither fact demonstrates that fixation masks this antibody's epitope (UniProt Q7LFL8 topology and modified residues). For weak sections, compare adjacent sections with the documented EDTA retrieval at pH 8.0 and matched primary incubation (datasheet A06865-1; standard IHC practice). Resolve isoform or epitope questions only with antibody epitope information or independently validated isoform-specific controls (standard IHC practice).
How should I assess CXXC5 by IF alongside a cell-type marker?
For a separate IF assessment, pair CXXC5 with a validated marker of the expected cell population, such as neuronal cells in cerebral cortex, and inspect each channel before interpreting overlap (HPA: High in cerebral cortex neuronal cells; standard IF practice). Choose fluorophores and acquisition settings against measured tissue autofluorescence, using unstained and single-label controls to identify bleed-through (standard IF practice). CXXC5 has no annotated transmembrane segment and is reported in nuclear and cytoplasmic compartments, so permeabilisation must allow antibody access to intracellular epitopes after fixation (UniProt Q7LFL8 topology and subcellular location; standard IF practice). Its cell-imaging assignment is mainly nucleoplasmic, with additional cytosolic localisation uncertain (HPA: subcellular location). The paraffin-section retrieval and antibody incubation document chromogenic IHC only and do not establish IF fixation, dilution or performance (datasheet A06865-1).
What controls help separate CXXC5 staining from chromogenic background?
Begin with a no-primary control and inspect pigment, deposits and tissue edges before assigning brown signal to CXXC5 (standard IHC practice). The selected assay used peroxidase-linked detection and DAB, making an appropriate peroxidase block and matched detection controls useful general safeguards (datasheet A06865-1; standard IHC practice). Its section was blocked with 10% goat serum and incubated with 2 μg/mL primary antibody overnight at 4°C (datasheet A06865-1). If background rises, compare a shorter primary incubation or lower concentration on adjacent sections while retaining a tissue control (standard IHC practice). HPA reports no detectable staining in adipocytes and lung alveolar cells, although those observations alone cannot validate a negative control for this antibody (HPA: tissue IHC).
How should I quantify CXXC5 across paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population, compartment and region before scoring; cerebral cortex neuronal cells and testis Leydig cells have reported high staining, while several other populations show lower or undetected staining (HPA: tissue IHC). For a cell-based comparison, record the percentage of positive cells and an H-score from prespecified intensity categories; count nuclei and cytoplasm separately when both are evaluated (standard IHC practice; UniProt Q7LFL8 subcellular location). If reporting positive-cell density per mm², normalise to the measured area of viable, analysable tissue and state the cell-selection rule (standard IHC practice). Keep retrieval, antibody incubation, chromogen development and image thresholds consistent across the comparison (standard IHC practice). Include matched control sections and report biological replicates so intensity differences are interpretable (standard IHC practice).
When is a CXXC5-positive cell credible rather than an artefact?
A credible result has staining within intact, identifiable cells, a plausible nuclear or cytoplasmic pattern, and little signal in the no-primary control (UniProt Q7LFL8 subcellular location; standard IHC practice). Cerebral cortex neuronal cells and testis Leydig cells provide reported high-staining reference populations, whereas lung alveolar cells and adipocytes were reported as undetected (HPA: tissue IHC). Treat strong signal confined to cut edges, necrotic regions, pigment or the no-primary control as possible artefact requiring review (standard IHC practice). Check a peroxidase-block control when DAB appears independently of primary antibody, because the selected assay uses peroxidase-linked chromogenic detection (datasheet A06865-1; standard IHC practice). HPA tissue staining has medium consistency with RNA expression, so confirm an unexpected cell or compartment pattern with independent evidence before making a biological claim (HPA: Approved, medium consistency; standard IHC practice).
Boster reagents
Best CXXC5 / CXXC-type zinc finger protein 5 IHC Antibodies
Two anti-CXXC5 antibodies have IHC images from mouse or human brain tissue (catalog image captions: A06865-1, A06865); A06865 also has a human brain IF image (catalog IF image caption: A06865).
Real IHC data
Anti-CXXC5 Antibody ®
Cat # A06865-1
Real IHC data
Anti-CXXC5 Antibody
Cat # A06865
A06865-1 shows CXXC5 IHC in a mouse brain paraffin section at 2 μg/mL (catalog IHC image caption: A06865-1). A06865 shows human brain IHC at 2.5 μg/mL and human brain IF at 20 μg/mL (catalog IHC and IF image captions: A06865).
Which to pick: For paraffin-section IHC, choose A06865-1 when its mouse brain example matches your workflow; the caption reports EDTA retrieval at pH 8.0, while the fixative is unreported (catalog IHC image caption: A06865-1). For tissue IF, choose A06865 because it lists IF and shows human brain IF; ICC validation is unreported (catalog applications and IF image caption: A06865). Both list human, mouse, and rat reactivity, but the pictured IHC evidence is mouse brain for the polyclonal A06865-1 and human brain for A06865 (catalog reactivity, dilution_raw, and IHC image captions: A06865-1, A06865).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q7LFL8 (CXXC5_HUMAN, CXXC-type zinc finger protein 5).
- Human Protein Atlas. CXXC5 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. CXXC5 subcellular location (ICC-IF): Mainly localized to the nucleoplasm. In addition localized to the cytosol..
- Human Protein Atlas. CXXC5 antibody validation summary (2 antibodies).
- Blockade of CXXC5-dishevelled interaction inhibits adipogenic differentiation, obesity, and insulin resistance in mice. Scientific reports 2022 — PMC9712602.
- Novel small molecules downregulate CDK1 expression and inhibit Wnt/β-catenin signaling in cutaneous squamous cell carcinoma by targeting its distinct tumor-specific cellular landscape. Experimental & molecular medicine 2025 — PMC12508097.
- The Dishevelled-binding protein CXXC5 negatively regulates cutaneous wound healing. The Journal of experimental medicine 2015 — PMC4493411.
- CXXC5 mediates growth plate senescence and is a target for enhancement of longitudinal bone growth. Life science alliance 2019 — PMC6458850.
- PubMed PMID:19557330 — UniProt-cited evidence.
- PubMed PMID:12761501 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for CXXC5 (CXXC-type zinc finger protein 5). Expected localisation Tissue IHC: cytoplasm; molecularly: nucleus and cytoplasm (HPA tissue IHC; UniProt). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A06865-1). Validated IHC antibody: A06865-1 at 2-5 μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Cerebral cortex (Neuronal cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded mouse brain tissue; fixative not specified (datasheet A06865-1); 2. Fixation: Image fixative and duration unreported (datasheet A06865-1); verify before use.; 3. Sectioning: 4–5 µm sections on charged slides (standard); 4. Deparaffinisation: Xylene, graded ethanol series to water (standard); 5. Antigen retrieval: Heat retrieval: EDTA pH 8.0 (datasheet A06865-1); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A06865-1); 8. Primary antibody: Rabbit anti-CXXC5, 2-5 μg/ml (datasheet A06865-1); 9. Primary incubation: Overnight at 4 °C (datasheet A06865-1). Watch for: Fixation: Keep paraffin-section fixation consistent across samples. (standard IHC practice; not target-specific); Caveat: Tissue staining has medium agreement with RNA expression (HPA tissue IHC); Isoform / epitope: 2 isoforms; epitope coverage is unspecified (UniProt); Regulation: Expression regulation not annotated (UniProt). Evidence: UniProt Q7LFL8, HPA tissue IHC · Approved, HPA ICC-IF · Mainly localized to the nucleoplasm. In addition localized to the…, Datasheet A06865-1, PMC9712602, PMC6458850. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/CXXC5/immunohistochemistry-ihc-guide.