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KCNMA1 / Calcium-activated potassium channel subunit alpha-1 · IHC design guide
Design Immunohistochemistry for KCNMA1
Plan paraffin-section KCNMA1 IHC around membranous and cytoplasmic tissue staining (HPA tissue IHC). Compare high staining in duodenal glandular cells with undetected staining in adipocytes, and verify specificity where staining and RNA disagree (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
KCNMA1 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 | Membranous and cytoplasmic tissue staining (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic and membranous staining in several tissues (HPA tissue IHC) | |
| Antigen retrieval | Citrate pH 6 HIER, heat-mediated (datasheet PB9227) | |
| Positive control | Duodenum+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 samples. (standard IHC practice; not target-specific) | |
| Caveat | Staining and RNA show low consistency; verify specificity (HPA tissue IHC) | |
| Regulation | Expression regulation is not established (UniProt) | |
| Isoform / epitope | 7 isoforms; map the epitope to extracellular or cytoplasmic regions (UniProt) |
Section 1
Recommended KCNMA1 IHC & IF Protocols
The catalog antibody has an IHC-P protocol (datasheet: PB9227). Two published protocols add human colorectal and yak lung examples (PMC6406553; PMC11110679).
| Sample | Paraffin-embedded mouse intestine tissue; fixative not specified (datasheet PB9227) |
| Fixation | Image fixative and duration unreported (datasheet PB9227); 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 PB9227) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet PB9227) |
| Primary antibody | Rabbit anti-KCNMA1, 0.5-1μg/ml (datasheet PB9227) |
| Primary incubation | Overnight at 4 °C (datasheet PB9227) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet PB9227) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | KCNMA1-positive staining in glandular cells of duodenum (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic and membranous expression in several tissues. No signal in the no-primary control. |
💡Decision noteStart with citrate pH 6 heat retrieval for the catalog antibody (datasheet: PB9227). The published microwave and unspecified retrieval steps require antibody-specific optimization (PMC6406553; PMC11110679).
Section 2
What Is the Expected KCNMA1 Staining Pattern?
KCNMA1 is a cell-membrane channel with seven transmembrane segments (UniProt Q12791 topology). In paraffin-section IHC, expect membranous and cytoplasmic staining in selected cells, including duodenal glandular cells, fallopian-tube ciliated cells and spermatogonia (HPA tissue IHC). Interpret these patterns cautiously: HPA rates its IHC evidence Approved but reports low consistency with RNA expression and pending external verification (HPA tissue IHC).
| Membranous staining, sometimes with cytoplasmic staining, in duodenal glandular cells. | This fits a reported High IHC pattern (HPA: duodenum) and the channel’s membrane location (UniProt Q12791). Cytoplasmic staining can be consistent with the HPA tissue profile; it does not, by itself, prove an intracellular pool of KCNMA1 (HPA tissue IHC). |
| Signal at the tips of fallopian-tube cilia or in spermatogonia. | Both are reported as High staining sites (HPA: fallopian tube; HPA: testis). Score the named cells and ciliary region rather than calling the whole tissue uniformly positive; the HPA observations are cell-specific (HPA tissue IHC). |
| Predominantly nuclear staining without the reported membranous or cytoplasmic pattern. | Treat this as discordant with the cell-membrane assignment and tissue IHC profile (UniProt Q12791; HPA tissue IHC). Check background and antibody specificity before interpreting it as KCNMA1; nuclear localization is not established by the supplied sources. |
| Strong signal in a cell type reported as not detected, such as adipocytes. | This conflicts with the reported adipocyte result (HPA: adipose tissue). Possible causes include cross-reactivity or endogenous detection activity; the discordance alone cannot identify which cause applies. HPA’s Approved rating also carries a low-consistency caveat (HPA tissue IHC). |
| Diffuse staining across tissue structures, or no staining in duodenal glandular cells. | Diffuse signal that obscures cell boundaries limits localization scoring. Absent signal in a reported High site warrants a run-control and detection check (HPA: duodenum); neither result alone establishes true KCNMA1 abundance because HPA tissue IHC is pending external verification (HPA tissue IHC). |
💡Expected KCNMA1 appearanceCall the slide positive when distinct membranous, possibly accompanying cytoplasmic, signal occurs in the reported cells—especially High duodenal glandular cells, ciliary tips or spermatogonia—while diffuse or predominantly nuclear staining remains suspect (HPA tissue IHC; UniProt Q12791).
| Membrane topology | Seven transmembrane segments support a membrane-centered interpretation; the long cytoplasmic region spans residues 389–1236 (UniProt Q12791 topology). HPA also describes cytoplasmic tissue staining (HPA tissue IHC), so assess its cell pattern rather than rejecting it automatically. |
| Cell-specific tissue distribution | HPA reports High staining in duodenal glandular cells, ciliary tips in fallopian tube and spermatogonia, but no detected staining in adipocytes or cardiomyocytes (HPA tissue IHC). These are observed patterns, not universal positive or negative controls. |
| Evidence strength | The listed antibody HPA054648 has IHC status Approved, not Enhanced (HPA antibodies). HPA notes low agreement between staining and RNA data and pending external verification (HPA tissue IHC); keep borderline or unexpected patterns provisional. |
| Epitope and isoforms | UniProt lists 7 KCNMA1 isoforms and cytoplasmic and extracellular regions (UniProt Q12791). The supplied record gives no antibody epitope, so it cannot predict which isoforms stain or prescribe epitope-specific permeabilisation or retrieval. |
| Processing | UniProt lists a single 1–1236 chain with no signal peptide or propeptide (UniProt Q12791). The supplied sources do not establish a cleaved or shed IHC product; do not assign a separate staining pattern to one. |
| Chromogenic detection background | Endogenous enzyme activity or nonspecific detection can create apparent IHC signal (standard IHC practice). Evaluate it with an appropriate reagent control; the supplied sources do not identify a KCNMA1-specific endogenous-activity problem. |
| Situation | Likely cause | Next action |
|---|---|---|
| No signal in duodenal glandular cells. | The site is reported High, so a failed stain is possible; variable sample biology also remains possible (HPA: duodenum; HPA tissue IHC reliability). | Confirm tissue preservation and that positive and reagent controls worked; review the validated IHC workflow, including retrieval and detection steps (standard IHC practice). Do not infer KCNMA1-specific retrieval sensitivity from HPA. |
| Only faint staining in a reported positive tissue. | HPA levels are cell-specific: cerebellar Purkinje cells, for example, are Medium, while duodenal glandular cells are High (HPA tissue IHC). | Compare the correct cell type and tissue region with a control run, then review antibody dilution, retrieval and detection as general IHC variables (standard IHC practice). No target-specific optimal setting is supplied. |
| Strong nuclear staining dominates the section. | The pattern conflicts with KCNMA1’s membrane assignment and HPA’s membranous/cytoplasmic profile (UniProt Q12791; HPA tissue IHC). Nonspecific staining is possible. | Check localization against a reported positive cell type and inspect reagent controls before scoring the nuclear signal (HPA tissue IHC; standard IHC practice). |
| Broad brown staining appears in reported negative cells. | HPA reports adipocytes and cardiomyocytes as not detected (HPA: adipose tissue; HPA: heart muscle). Background, cross-reactivity or endogenous chromogenic activity could explain discordant signal. | Use an appropriate reagent control and inspect whether staining follows cell boundaries and the reported cell distribution (standard IHC practice; HPA tissue IHC). Treat the HPA negatives as observations, not absolute exclusions. |
| Cytoplasmic signal is present without a clear membrane rim. | HPA describes both cytoplasmic and membranous tissue expression, while UniProt assigns KCNMA1 to the cell membrane (HPA tissue IHC; UniProt Q12791). The sources do not explain the mismatch for an individual section. | Score the named positive cells and report the compartment observed; check whether diffuse background obscures cell edges before making a stronger localization claim (HPA tissue IHC; standard IHC practice). |
| Can IF/ICC settle an ambiguous IHC pattern? | HPA summarizes the subcellular location as membrane but supplies no ICC-IF image cell lines or main-location assignment (HPA subcellular). | Use the HPA membrane summary only as limited context (HPA subcellular). Interpret the paraffin IHC slide against its own cell-specific HPA tissue pattern and controls; IF/ICC requires its separate guide. |
Experiment evidence
IHC & IF images showing KCNMA1 staining
PB9227 · IHCIHC analysis of KCNMA1 using anti-KCNMA1 antibody (PB9227). KCNMA1 was detected in paraffin-embedded section of mouse intestine tissue. Heat
PB9227 · IHCIHC analysis of KCNMA1 using anti-KCNMA1 antibody (PB9227). KCNMA1 was detected in paraffin-embedded section of rat intestine tissue. Heat m
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000156113-KCNMA1/tissue/cerebral+cortex#imid_16132263
HPA · CerebellumHuman Protein Atlas IHC, Cerebellum. Source: https://www.proteinatlas.org/ENSG00000156113-KCNMA1/tissue/cerebellum#imid_16132274
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000156113-KCNMA1/tissue/colon#imid_16126301
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000156113-KCNMA1/tissue/liver#imid_16126294
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for KCNMA1 IHC & IF
🧪Run duodenum first: glandular cells should stain strongly (HPA: High in duodenal glandular cells). Run adipose tissue as the biological tissue negative (HPA: Not detected in adipocytes); on the duodenum slide, assess nonglandular cells for background staining, but do not assume they are KCNMA1-negative without separate validation (HPA: glandular-cell result only).
Positive control tissue: Duodenum (Glandular cells, HPA High)
Negative control tissue: Adipose tissue (HPA Not detected)
ICC-IF cell lines (HPA subcellular resource): HPA carries no ICC-IF cell line for KCNMA1; derive a cell-line control from the positive tissue's cell type (Glandular cells) and confirm it by RNA or western blot first.
Technical controls: Include a no-primary, secondary-only control and a rabbit IgG isotype control matched to the primary antibody; a KCNMA1 knockout section provides a stronger biological specificity control (selected PB9227 caption: rabbit primary; standard IHC practice). Block endogenous peroxidase and check endogenous biotin in duodenum because the reported detection uses a biotinylated secondary and DAB (selected PB9227 caption; standard IHC practice).
⚠️Feasibility: The selected PB9227 paraffin-section caption reports citrate retrieval at pH 6 for 20 minutes, but reports no fixative or target-specific fixation window or effect (selected PB9227 caption). The reported IHC staining therefore supports trying that retrieval condition, without establishing that retrieval is required (selected PB9227 caption). The supplied evidence does not establish whether frozen sections or IF/ICC are easier for KCNMA1; for duodenum, assess endogenous biotin staining with the reported biotin-based detection (selected PB9227 caption; standard IHC practice).
HPA tissue IHC evidence for KCNMA1
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 |
|---|---|---|---|---|
| Duodenum | Glandular cells | High | Protein (IHC) | HPA → |
| Fallopian tube | Ciliated cells (tip of cilia) | High | Protein (IHC) | HPA → |
| Testis | Spermatogonia cells | High | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Medium | Protein (IHC) | HPA → |
| Appendix | Glandular cells | 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 → |
| Esophagus | Squamous epithelial cells | Not detected | Protein (IHC) | HPA → |
| Heart muscle | Cardiomyocytes | Not detected | Protein (IHC) | HPA → |
| Hippocampus | Glial cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced KCNMA1 IHC Tips
Troubleshoot KCNMA1 staining in paraffin sections by checking retrieval, tissue processing, cell location and assay controls before comparing signal intensity.
What retrieval should I try when KCNMA1 staining is weak?
Start with heat-mediated retrieval in citrate buffer at pH 6 for 20 minutes (datasheet PB9227). The documented paraffin-section workflow used this retrieval before overnight incubation with the catalog antibody at 1 μg/mL and 4°C (datasheet PB9227). If staining remains weak, check section adherence, heating consistency and whether the tissue experienced the full retrieval time (standard IHC practice). Compare a reference section across runs before changing retrieval conditions, because processing differences can alter staining (standard IHC practice). Assess membrane-associated signal as well as cytoplasmic signal when judging improvement (UniProt Q12791 localisation; HPA tissue IHC profile).
Could fixation explain weak or uneven KCNMA1 staining?
The selected paraffin-section caption does not report a fixative, so KCNMA1-specific sensitivity to fixation is unknown (datasheet PB9227). Record fixative, duration and tissue thickness for each specimen, and compare sections processed together before attributing a difference to KCNMA1 expression (standard IHC practice). Inadequate fixation or prolonged processing can change morphology and antigen accessibility in tissue IHC generally; neither effect has been established specifically for this antibody (standard IHC practice; datasheet PB9227). If signal varies within a section, inspect morphology and staining at its center and edges, then repeat staining with matched processing and the documented pH 6 retrieval (standard IHC practice; datasheet PB9227).
Where should convincing KCNMA1 staining appear in tissue?
Prioritize membrane-associated staining: KCNMA1 is annotated at the cell membrane, with 7 transmembrane segments and a large cytoplasmic region spanning residues 389–1236 (UniProt Q12791 topology and localisation). Cytoplasmic and membranous staining have also been reported across several tissues, so cytoplasmic signal requires interpretation alongside cell morphology and controls (HPA tissue IHC profile). In epithelial sections, compare staining within the identified cell population rather than treating all brown pixels as equivalent (standard IHC practice). For orientation, HPA reports high staining in duodenal glandular cells and at fallopian-tube cilia tips (HPA tissue IHC). A predominantly nuclear pattern would warrant review of specificity and detection controls (UniProt Q12791 localisation; standard IHC practice).
How could the epitope affect apparent KCNMA1 distribution?
KCNMA1 has 7 annotated isoforms, but the supplied product caption does not identify this antibody’s epitope (UniProt Q12791 isoforms; datasheet PB9227). Its transmembrane topology places residues 389–1236 on the cytoplasmic side, while several short loops are extracellular (UniProt Q12791 topology). Check the antibody’s documented immunogen before assigning an absent stain to an isoform or choosing epitope-specific permeabilisation conditions (standard IHC practice; datasheet PB9227). Phosphorylation is annotated at several residues, including 763 and 765, but the supplied evidence does not establish an effect on this antibody’s staining (UniProt Q12791 modified residues; datasheet PB9227). Compare matched sections and an independent antibody where epitope identity matters (standard IHC practice).
How should I investigate KCNMA1 by multiplex IF?
Treat multiplex IF as a separate assay requiring its own controls; the supplied PB9227 tissue example uses chromogenic detection in paraffin sections (datasheet PB9227). Pair KCNMA1 with a validated marker of the cell population under study, and inspect whether membrane-associated signal belongs to the same cells (UniProt Q12791 localisation; standard IF practice). Choose fluorophores after viewing unstained tissue in each channel, placing the weaker expected signal in a channel with less autofluorescence (standard IF practice). The antibody’s epitope is unspecified; determine whether it faces the cytoplasm before selecting permeabilisation, because KCNMA1 has both extracellular regions and a large cytoplasmic region (datasheet PB9227; UniProt Q12791 topology). Include single-stain controls to assess bleed-through (standard IF practice).
What should I check when the DAB background obscures KCNMA1?
The documented paraffin-section example used 10% goat serum blocking, biotinylated goat anti-rabbit secondary detection and DAB development (datasheet PB9227). Start by comparing a no-primary control with the stained section, then check wash quality, antibody concentration and development time (standard IHC practice). Block endogenous peroxidase before chromogenic detection, and assess endogenous biotin where a biotin-based system gives widespread signal (standard IHC practice; datasheet PB9227 detection scheme). If diffuse brown staining persists, shorten DAB development or titrate the primary against the documented 1 μg/mL condition while retaining a reference section (standard IHC practice; datasheet PB9227). Exclude pigment and damaged tissue from interpretation (standard IHC practice).
How can I score KCNMA1 staining reproducibly? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and compartment before scoring, since KCNMA1 is membrane-associated and HPA also reports cytoplasmic tissue staining (UniProt Q12791 localisation; HPA tissue IHC profile). For discrete cells, record the percentage positive and intensity grades 0–3, then calculate an H-score on the 0–300 scale if intensity matters (standard IHC scoring practice). For a spatial question, report positive-cell density per mm² of viable tissue or the fraction of a defined compartment stained (standard IHC scoring practice). Normalize to the same eligible cell population or tissue area across specimens, excluding folds, edges and necrosis (standard IHC practice). Keep illumination, DAB development and thresholds consistent (standard IHC practice).
How do I distinguish KCNMA1 signal from artefact?
Look for reproducible staining in the expected membrane-associated compartment and relevant cells, with appropriate no-primary and reference-section controls (UniProt Q12791 localisation; standard IHC practice). HPA reports high staining in duodenal glandular cells but undetected staining in esophageal squamous epithelial cells; these patterns can guide comparison without proving antibody specificity (HPA tissue IHC). Question isolated nuclear staining, section-edge deposits, necrotic-region staining and signal also present in the no-primary control (UniProt Q12791 localisation; standard IHC practice). Check endogenous peroxidase and biotin contributions when using the documented biotin-based DAB workflow (standard IHC practice; datasheet PB9227). Interpret discordance cautiously because HPA notes low staining–RNA consistency and pending external verification (HPA tissue IHC reliability).
Boster reagents
Best KCNMA1 / Calcium-activated potassium channel subunit alpha-1 IHC Antibodies
The IHC-validated antibody has paraffin-section images from mouse and rat intestine and human lung cancer tissue (PB9227 IHC image captions).
Real IHC data
Anti-Maxi Potassium channel alpha/KCNMA1 Antibody ®
Cat # PB9227
PB9227 will render with its own mouse-intestine paraffin-section IHC figure (PB9227 figure caption). Additional IHC images show rat intestine and human lung cancer paraffin sections (PB9227 IHC image captions).
Which to pick: Choose PB9227 for tissue IHC across human, mouse, and rat; those species are listed for IHC and represented in paraffin-section images (PB9227 catalog applications/reactivity; PB9227 IHC image captions). No IF/ICC application or IF image is listed for PB9227, so this payload does not support an IF/ICC selection (PB9227 catalog applications; PB9227 IF image alts). The IHC captions report citrate retrieval at pH 6 for 20 minutes and 1 μg/ml primary antibody; the fixative and clone designation are unreported (PB9227 IHC image captions; PB9227 catalog clone field).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q12791 (KCMA1_HUMAN, Calcium-activated potassium channel subunit alpha-1).
- Human Protein Atlas. KCNMA1 tissue IHC expression (reliability: Approved).
- Human Protein Atlas. KCNMA1 subcellular location (ICC-IF): Membrane.
- Human Protein Atlas. KCNMA1 antibody validation summary (1 antibodies).
- KCNMA1 Expression is Downregulated in Colorectal Cancer via Epigenetic Mechanisms. Cancers 2019 — PMC6406553.
- Metabolomic and transcriptomic signatures of prenatal excessive methionine support nature rather than nurture in schizophrenia pathogenesis. Communications biology 2020 — PMC7393105.
- Transcriptomics reveals age-related changes in ion transport-related factors in yak lungs. Frontiers in veterinary science 2024 — PMC11110679.
- Co-dependent regulation of p-BRAF and potassium channel KCNMA1 levels drives glioma progression. Cellular and molecular life sciences : CMLS 2023 — PMC9918570.
- PubMed PMID:7877450 — UniProt-cited evidence.
- PubMed PMID:7573516 — UniProt-cited evidence.
- PubMed PMID:15164054 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for KCNMA1 (Calcium-activated potassium channel subunit alpha-1). Expected localisation Membranous and cytoplasmic tissue staining (HPA tissue IHC). Antigen retrieval: Citrate pH 6 HIER, heat-mediated (datasheet PB9227). Validated IHC antibody: PB9227 at 0.5-1μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Duodenum (Glandular cells); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded mouse intestine tissue; fixative not specified (datasheet PB9227); 2. Fixation: Image fixative and duration unreported (datasheet PB9227); 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 PB9227); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet PB9227); 8. Primary antibody: Rabbit anti-KCNMA1, 0.5-1μg/ml (datasheet PB9227); 9. Primary incubation: Overnight at 4 °C (datasheet PB9227). Watch for: Fixation: Keep fixation consistent across samples. (standard IHC practice; not target-specific); Caveat: Staining and RNA show low consistency; verify specificity (HPA tissue IHC); Isoform / epitope: 7 isoforms; map the epitope to extracellular or cytoplasmic regions (UniProt); Regulation: Expression regulation is not established (UniProt). Evidence: UniProt Q12791, HPA tissue IHC · Approved, HPA ICC-IF · Membrane, Datasheet PB9227, PMC6406553, PMC11110679. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/KCNMA1/immunohistochemistry-ihc-guide.