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- Table of Contents
Plan CDKN1C paraffin-section IHC around nuclear tissue staining (HPA tissue IHC). Use glomerular, pancreatic endocrine or decidual cells as positive controls (HPA tissue IHC), and compare nuclear signal with a negative control (standard IHC practice).
Expected localisation, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.
| Expected localisation | Nuclear staining in several tissues (HPA tissue IHC) | |
| Staining pattern | Nuclear staining in glomerular, endocrine and decidual cells (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A01244-2) | |
| Positive control | Adrenal gland+4 more · see all | |
| Negative control | Adipose tissue+4 more · see all |
| Fixation | Keep fixation consistent across paraffin sections. (standard IHC practice; not target-specific) | |
| Caveat | Lung alveolar cells have no detectable staining (HPA tissue IHC) | |
| Regulation | Expression varies by cell type (HPA tissue IHC) | |
| Isoform / epitope | 2 isoforms, Long and Short; epitope coverage unknown (UniProt) |
Start with the catalog antibody’s IHC-P protocol (datasheet: EDTA pH 8.0 retrieval). Two published CDKN1C IHC protocols provide additional conditions for breast cancer and mouse fetal sections (PMC2323395; PMC4786089).
| Sample | Paraffin-embedded human esophageal squamous carcinoma tissue; fixative not specified (datasheet A01244-2) |
| Fixation | Image fixative and duration unreported (datasheet A01244-2); 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 A01244-2); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A01244-2) |
| Primary antibody | Rabbit anti-CDKN1C, 2 μg/ml (datasheet A01244-2) |
| Primary incubation | Overnight at 4 °C (datasheet A01244-2) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A01244-2) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | CDKN1C-positive staining in glandular cells of adrenal gland (HPA tissue IHC: High). HPA tissue profile: Nuclear expression in several tissues. No signal in the no-primary control. |
CDKN1C is a nuclear, non-membrane protein (UniProt P49918: nucleus; no transmembrane segment). In paraffin-section IHC, expect nuclear staining in selected cells, including glomerular cells, pancreatic endocrine cells, placental decidual cells and adrenal glandular cells (HPA: High in each). HPA describes nuclear expression across several tissues, with Enhanced IHC reliability and medium consistency between antibody staining and RNA expression (HPA: tissue IHC).
| Distinct nuclear stain in glomerular cells, pancreatic endocrine cells, decidual cells or adrenal glandular cells. | This matches HPA’s High staining in those cell populations and its overall nuclear IHC profile (HPA: tissue IHC). Score the identified cells and their nuclei; a whole-section average can hide the expected cell-specific pattern (general IHC practice). |
| Predominantly cytoplasmic or membrane-like stain, with little convincing nuclear signal. | That conflicts with the expected nuclear IHC pattern and the absence of a transmembrane segment (HPA: tissue IHC; UniProt P49918 topology). Review morphology and staining controls before interpreting it as CDKN1C. HPA reports additional cytosol localization in ICC-IF, which does not establish a cytoplasmic IHC pattern (HPA: subcellular). |
| Strong signal in adipocytes, lung alveolar cells or lymph-node germinal center cells. | HPA reports CDKN1C as Not detected in those particular cell populations (HPA: tissue IHC). Check cell identification, antibody-dependent cross-reactivity and endogenous detection activity (general IHC practice). A positive signal in another cell population from the same tissue is a separate observation. |
| Diffuse stain across nuclei, cytoplasm and tissue spaces, without clear cell boundaries. | A diffuse field does not reproduce the reported cell-selective nuclear pattern (HPA: tissue IHC). Possible general IHC causes include excess antibody or detection reagent, inadequate washing and endogenous chromogen-generating activity; compare no-primary and detection controls before assigning target expression (general IHC practice). |
| No nuclear stain in an otherwise interpretable section of kidney glomeruli or pancreatic endocrine tissue. | HPA reports High staining in those specified cells (HPA: tissue IHC), so first confirm that the relevant cells are present. If they are, review the IHC-validated antibody and run controls through the same staining workflow; an unstained slide alone cannot distinguish absent antigen from assay failure (general IHC practice). |
| Cell population and tissue choice (HPA: tissue IHC). | High staining is reported in adrenal glandular, glomerular, pancreatic endocrine and decidual cells; Medium staining is reported in selected marrow, brain and duodenal cells (HPA: tissue IHC). Assess the named population within a section rather than treating every cell in a positive tissue as positive (general IHC practice). |
| IHC evidence strength (HPA: tissue IHC; HPA: antibody HPA002924). | The tissue profile reports Enhanced reliability but only medium consistency with RNA expression; the listed rabbit polyclonal antibody has Enhanced IHC validation (HPA: tissue IHC; HPA: antibody HPA002924). Treat unexpected results as requiring controls and cell-level review, rather than assuming either the slide or the reference is definitive. |
| Isoforms and processing (UniProt P49918). | UniProt lists 2 isoforms, Long and Short, and a chain spanning residues 1–316, with no signal peptide or propeptide (UniProt P49918). These facts do not identify an antibody epitope or establish an isoform-specific IHC pattern; do not assign staining differences to an isoform without additional evidence. |
| IF/ICC: Where should CDKN1C appear? (HPA: subcellular). | Mainly in nucleoplasm and nuclear bodies, with additional cytosol localization reported in ICC-IF images from HeLa, SiHa and U2OS cells (HPA: subcellular). This answers the localization question for IF/ICC; the paraffin-section IHC interpretation here follows the tissue IHC nuclear profile (HPA: tissue IHC). |
| Situation | Likely cause | Next action |
|---|---|---|
| A proposed positive-control section appears entirely negative. | The expected cell population may be absent from the sampled area, or the staining run may have failed (HPA: tissue IHC; general IHC practice). | Confirm glomerular, pancreatic endocrine, decidual or adrenal glandular cells in the section, then compare a same-run positive control and detection controls (HPA: High in those cells; general IHC practice). |
| Only weak staining is visible in a chosen tissue. | The sampled cells may normally show Medium or Low staining rather than High staining (HPA: tissue IHC). Tissue-level RNA enrichment does not guarantee strong IHC signal in each cell (HPA: tissue IHC). | Identify and score the relevant cell type; compare with a reported High population processed in the same run before adjusting the general IHC workflow (HPA: tissue IHC; general IHC practice). |
| Brown color persists where the primary antibody was omitted. | The signal can arise from the detection system or endogenous tissue activity rather than primary-antibody binding (general chromogenic IHC practice). | Check the no-primary control and the detection system’s blocking steps; interpret CDKN1C only where nuclear signal exceeds that control (general chromogenic IHC practice; UniProt P49918: nucleus). |
| Unexpected cytoplasmic or membrane-like staining dominates. | The pattern disagrees with nuclear tissue IHC localization; membrane localization is unsupported by the UniProt topology record (HPA: tissue IHC; UniProt P49918 topology). | Verify cell morphology and compare controls and an HPA High nuclear population. Do not transfer the additional cytosol observation from ICC-IF directly to paraffin IHC (HPA: subcellular; HPA: tissue IHC). |
| Signal appears strong in an HPA Not detected cell population. | Possible explanations include cell misidentification, cross-reactivity or endogenous detection activity; the HPA entry applies to the named cells, not automatically to the entire organ (HPA: tissue IHC; general IHC practice). | Recheck the stained cell type against the corresponding HPA tissue entry and inspect no-primary and positive controls before calling the finding CDKN1C expression (HPA: tissue IHC; general IHC practice). |
| A run gives widespread haze that obscures nuclear scoring. | Excess staining reagent or insufficient washing can raise background in chromogenic IHC (general IHC practice). | Compare no-primary controls, review reagent concentration and wash steps, and repeat with a controlled adjustment if needed; judge success by restored cell-selective nuclear staining (general IHC practice; HPA: tissue IHC). |
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — 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.
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adrenal gland | Glandular cells | High | Protein (IHC) | HPA → |
| Kidney | Cells in glomeruli | High | Protein (IHC) | HPA → |
| Pancreas | Pancreatic endocrine cells | High | Protein (IHC) | HPA → |
| Placenta | Decidual cells | High | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Medium | Protein (IHC) | HPA → |
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Cervix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Colon | Endothelial cells | Not detected | Protein (IHC) | HPA → |
| Endometrium | Cells in endometrial stroma | Not detected | Protein (IHC) | HPA → |
Troubleshoot CDKN1C staining in paraffin sections by checking retrieval, nuclear localisation, cell type and detection controls before comparing signal across samples.
Explore anti-CDKN1C antibodies with IHC images from human and rat paraffin sections and an IF image from HeLa cells (catalog: IHC and IF image captions).
A01244-2 shows IHC in human esophageal squamous carcinoma and rat kidney paraffin sections (A01244-2: IHC captions); M01244-2 shows IHC in human thyroid cancer paraffin sections and IF in HeLa cells (M01244-2: IHC and IF captions). M01244-3 shows IHC staining in human kidney tissue (M01244-3: IHC caption).
Which to pick: For paraffin-section IHC with a documented workflow, choose A01244-2: its caption specifies EDTA retrieval at pH 8.0, 10% goat serum blocking, 2 μg/ml primary antibody overnight at 4°C, and DAB detection (A01244-2: IHC caption). For IF/ICC, choose rabbit monoclonal M01244-2, which lists both applications and shows IF in HeLa cells (M01244-2: catalog applications, clone and IF caption). For human, mouse or rat IHC, A01244-2 and M01244-2 list all three species, while M01244-3 lists human only (catalog: reactivity); the IHC captions describe paraffin sections or tissue staining but do not report a fixative (catalog: IHC captions).