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GNRH1 / Progonadoliberin-1 · IHC design guide
Design Immunohistochemistry for GNRH1
Plan chromogenic GNRH1 IHC in paraffin sections around the reported cytoplasmic staining pattern (HPA tissue IHC). Use high staining in ciliary rootlets as a positive reference and titrate the IHC-validated antibody within 1:100–1:300 (HPA tissue IHC; datasheet A02307).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
GNRH1 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 | Cytoplasmic staining in several tissues (HPA tissue IHC) | |
| Staining pattern | Cytoplasmic neurons; strong ciliary rootlets (HPA tissue IHC) | |
| Antigen retrieval | Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen) | |
| Positive control | Bronchus+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 paraffin sections (standard IHC practice; not target-specific) | |
| Caveat | Secreted protein may stain away from its RNA source (HPA tissue IHC) | |
| Regulation | No expression regulator specified (UniProt) | |
| Isoform / epitope | No isoforms annotated; peptide processing may alter epitopes (UniProt) |
Section 1
Recommended GNRH1 IHC & IF Protocols
Compare the catalog antibody’s IHC-P protocol (datasheet) with four published GnRH1 chromogenic IHC protocols (PMC10924128; PMC2987182; PMC5078152; PMC11680279).
| Sample | Paraffin-embedded human heart tissue; fixative not specified (datasheet A02307) |
| Fixation | Image fixative and duration unreported (datasheet A02307); verify before use. |
| Sectioning | 4–5 µm sections on charged slides (standard) |
| Deparaffinisation | Xylene, graded ethanol series to water (standard) |
| Antigen retrieval | Heat-induced epitope retrieval in citrate buffer, pH 6.0, 20 min at 95–98 °C (standard rule: cytoplasmic / membrane antigen) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% normal serum of the secondary host, 30 min, room temperature (standard) |
| Primary antibody | Rabbit anti-GNRH1, 1:100 - 1:300 (datasheet A02307) |
| Primary incubation | Overnight at 4 °C (standard) |
| Detection | HRP-polymer secondary, DAB chromogen 5–10 min (standard) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | GNRH1-positive staining in ciliated cells (ciliary rootlets) of bronchus (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression in several tissues, including a subset of neurons in hypothalamus. No signal in the no-primary control. |
💡Decision noteStart with citrate pH 6.0 retrieval at 95–98 °C for 20 min (page antigen retrieval rule); adjust for the sample using its published protocol.
Section 2
What Is the Expected GNRH1 Staining Pattern?
GNRH1 is a secreted protein without a transmembrane segment (UniProt P01148). In IHC, expect cytoplasmic staining in several tissues, including a subset of hypothalamic neurons, and staining at ciliary rootlets in specified ciliated cells (HPA tissue IHC). HPA rates the tissue pattern Supported and notes that protein and RNA locations may differ for a secreted protein (HPA tissue IHC).
| Strong, discrete staining at ciliary rootlets in bronchus, fallopian tube or nasopharynx (HPA tissue IHC). | This matches HPA's High staining in ciliated cells at those sites (HPA tissue IHC). Score the rootlet pattern in the stated cell type; staining spread uniformly across the section is less convincing than a discrete pattern (general IHC practice). |
| Cytoplasmic staining in a subset of hypothalamic neurons, or Medium staining in caudate or cerebral cortex neuronal cells (HPA tissue IHC). | These findings fit the reported neuronal pattern (HPA tissue IHC). HPA does not assign an intensity to the hypothalamic subset in this payload, so do not require its signal to equal the High rootlet signal. |
| Predominantly nuclear staining, with little of the expected cytoplasmic or rootlet pattern (HPA tissue IHC). | Treat nuclear predominance as suspect: UniProt describes GNRH1 as secreted, and HPA reports cytoplasmic tissue expression and ciliary rootlet staining (UniProt P01148; HPA tissue IHC). Check morphology and controls before scoring it as GNRH1. |
| Strong signal in a cell type reported as Not detected, such as adipocytes or adrenal glandular cells (HPA tissue IHC). | This conflicts with those HPA observations (HPA tissue IHC). Cross-reactivity or endogenous chromogenic detection activity are possible explanations; compare a reagent control and a known-positive section before assigning target specificity (general IHC practice). |
| Diffuse staining across cells and extracellular areas, or no staining in a section expected to be positive (HPA tissue IHC). | Diffuse signal obscures the reported cell-specific pattern; absent signal in High-staining bronchial ciliated cells makes the run inconclusive (HPA tissue IHC). Review controls and section quality before interpreting a negative result (general IHC practice). |
💡Expected GNRH1 appearanceCall a section positive when staining resolves to ciliary rootlets of the specified ciliated cells at High intensity, or to the reported neuronal cytoplasm; strong nuclear or widespread cell-independent staining is suspect (HPA tissue IHC; general IHC practice).
| Secretion and processing | GNRH1 has a signal peptide at residues 1–23 and a processed chain at 24–92 (UniProt P01148). Epitope location is needed to know which form an antibody detects; it is not supplied here. |
| Protein versus RNA location | HPA reports Low tissue RNA specificity but warns that RNA and protein locations can differ for this secreted protein (HPA tissue IHC). Use the observed cell pattern to judge the stain. |
| Antibody evidence | HPA rates tissue staining Supported and lists HPA027532 IHC as Supported (HPA tissue IHC; HPA antibodies). This supports the reported pattern but does not establish specificity for every tissue or condition. |
| IF evidence | HPA lists GNRH1 as Secreted but provides no ICC-IF main location or cell-line images (HPA subcellular). A comparable IF pattern cannot be assumed from those missing observations. |
| Situation | Likely cause | Next action |
|---|---|---|
| No signal in bronchial ciliated cells. | Bronchial ciliary rootlets are High by HPA, so an absent signal could reflect a failed staining run or a problem with that section (HPA tissue IHC; general IHC practice). | Inspect the ciliated epithelium and run controls; check the IHC-validated antibody, detection reagents and retrieval against their documented instructions (general IHC practice). No GNRH1-specific retrieval condition is supplied. |
| Only diffuse brown haze is visible. | Diffuse signal does not resolve the cell-specific HPA pattern; background from detection reagents or insufficient blocking is possible (HPA tissue IHC; general IHC practice). | Compare reagent controls, then optimize blocking, washes and chromogenic detection within the assay's validated workflow (general IHC practice). Score only a resolved cell and compartment pattern. |
| Strong nuclear staining dominates. | A nuclear-dominant pattern conflicts with HPA's cytoplasmic and rootlet observations and UniProt's secreted annotation (HPA tissue IHC; UniProt P01148). | Check counterstain separation and reagent controls; compare a known-positive section before accepting nuclear signal as specific (general IHC practice). |
| Adipocytes or adrenal glandular cells stain strongly. | Both cell types are Not detected in the supplied HPA IHC observations; cross-reactivity or endogenous detection activity may account for the signal (HPA tissue IHC; general IHC practice). | Compare a reagent control with the stained section and check whether the expected positive cell pattern is present in the same run (general IHC practice). |
| Neuronal signal is weaker than bronchial rootlet signal. | HPA assigns High to bronchial ciliary rootlets and Medium to caudate and cerebral cortex neuronal cells; it gives no intensity for the hypothalamic subset here (HPA tissue IHC). | Judge each named cell population against its own reported pattern and the run controls; do not impose one intensity threshold across these tissues (HPA tissue IHC; general IHC practice). |
| An IF experiment lacks a clear subcellular pattern. | HPA has no ICC-IF main-location call or cell-line images for GNRH1 in this payload (HPA subcellular). | Interpret that IF result with its own controls and the separate IF/ICC guide; use the supplied HPA tissue IHC pattern only as tissue context (HPA tissue IHC; HPA subcellular). |
Experiment evidence
IHC & IF images showing GNRH1 staining
A02307 · IHCImmunohistochemistry analysis of GnRH I antibody in paraffin-embedded human heart tissue.
A02307-1 · IHCImmunohistochemistry (IHC) analyzes of GnRH I (D43) pAb in paraffin-embedded human colorectal carcinoma tissue at 1:50.
HPA · HypothalamusHuman Protein Atlas IHC, Hypothalamus. Source: https://www.proteinatlas.org/ENSG00000147437-GNRH1/tissue/hypothalamus#imid_424
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000147437-GNRH1/tissue/cerebral+cortex#imid_19942981
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000147437-GNRH1/tissue/colon#imid_19946587
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000147437-GNRH1/tissue/liver#imid_19946588
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for GNRH1 IHC & IF
🧪Run bronchus first: ciliated cells at the ciliary rootlets should stain (High; HPA: bronchus), while cells outside that compartment should remain at control-level background. Use adipose tissue as the negative comparator (Not detected in adipocytes; HPA: adipose tissue).
Positive control tissue: Bronchus (Ciliated cells (ciliary rootlets), 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 GNRH1; derive a cell-line control from the positive tissue's cell type (Ciliated cells (ciliary rootlets)) and confirm it by RNA or western blot first.
Technical controls: Include a no-primary (secondary-only) slide, an isotype control matched to the primary antibody’s host species and clonality, and a biological specificity control such as GNRH1 knockout tissue or competition with the cognate immunizing peptide. For chromogenic IHC in bronchus, block endogenous peroxidase and check for endogenous biotin if using biotin-based detection (standard IHC practice).
⚠️Feasibility: A target-specific fixation window and retrieval dependency are unreported in the supplied evidence; the selected A02307 paraffin-section heart caption does not report a fixative (catalog caption: A02307). Optimize antigen retrieval empirically; the evidence does not establish that frozen sections or IF/ICC are easier, and HPA lists no ICC-IF image cell lines (HPA: subcellular). No bronchus-specific artefact is documented, but assess the ciliary-rootlet pattern carefully against specificity controls because GNRH1 is annotated as secreted (HPA: bronchus; UniProt P01148: secreted).
HPA tissue IHC evidence for GNRH1
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Supported — Secreted protein, tissue location of RNA and protein is expected to differ. External characterization data supports antibody staining.). 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 |
|---|---|---|---|---|
| Bronchus | Ciliated cells (ciliary rootlets) | High | Protein (IHC) | HPA → |
| Fallopian tube | Ciliated cells (ciliary rootlets) | High | Protein (IHC) | HPA → |
| Nasopharynx | Ciliated cells (ciliary rootlets) | High | Protein (IHC) | HPA → |
| Breast | Glandular cells | Medium | Protein (IHC) | HPA → |
| Caudate | Neuronal cells | Medium | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| Adipose tissue | Adipocytes | Not detected | Protein (IHC) | HPA → |
| Adrenal gland | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Appendix | Glandular cells | Not detected | Protein (IHC) | HPA → |
| Bone marrow | Hematopoietic cells | Not detected | Protein (IHC) | HPA → |
| Duodenum | Glandular cells | Not detected | Protein (IHC) | HPA → |
Section 3
Advanced GNRH1 IHC Tips
Troubleshoot chromogenic GNRH1 IHC in paraffin sections by checking retrieval, controls and cell-specific localisation before interpreting staining intensity.
How should I retrieve GNRH1 antigen when staining is weak?
Start with citrate buffer at pH 6.0 for heat-induced retrieval at 95–98 °C for 20 min (page retrieval setting). If staining remains weak, compare a modestly longer retrieval time on adjacent sections while keeping the antibody and detection conditions constant (standard IHC practice). Allow sections to cool in buffer, then compare signal and tissue preservation against a positive control such as hypothalamic neurons (HPA: cytoplasmic expression in a subset of hypothalamic neurons). Record any change in background as well as signal, because stronger chromogenic staining alone cannot establish GNRH1 specificity (standard IHC practice).
Could fixation explain weak or patchy GNRH1 staining?
Target-specific fixation sensitivity is unknown from the supplied evidence, and the selected antibody caption identifies paraffin-embedded human heart without stating its fixative (A02307 tissue-IHC caption). Compare sections with documented fixation histories under the same citrate pH 6.0, 95–98 °C, 20 min retrieval conditions (page retrieval setting). If staining varies with fixation history, repeat the comparison with the same section thickness, antibody incubation and chromogenic development time (standard IHC practice). Treat the result as a local workflow observation rather than a known GNRH1 fixation effect; include a positive tissue control in each run (standard IHC practice).
Where should a convincing GNRH1 signal appear in tissue?
Assess cell-associated cytoplasmic staining first, including a subset of hypothalamic neurons (HPA: tissue IHC profile). GNRH1 is annotated as secreted and has no transmembrane segment (UniProt P01148: subcellular location and topology), so a crisp plasma-membrane outline is not an expected requirement. Compare the stained cells with morphology and a matched negative control; HPA reports high ciliary-rootlet staining in bronchial ciliated cells and no detected signal in heart-muscle cardiomyocytes (HPA: tissue IHC). Score intracellular and extracellular staining separately, because secretion can complicate assignment of diffuse chromogen to its producing cell (UniProt P01148: secreted; standard IHC practice).
How do GNRH1 processing and epitope choice affect IHC interpretation?
Check the catalog antibody’s immunogen or mapped epitope before comparing staining across assays, because GNRH1 has a 92-aa precursor and an annotated 24–92 chain (UniProt P01148: sequence and processing). Its signal sequence spans residues 1–23, while residue 24 has a pyrrolidone-carboxylic-acid modification and residue 33 has an amidation annotation (UniProt P01148: processing and modified residues). An antibody against a processed region may report a different molecular pool from one against a region removed during maturation (UniProt P01148: processing; standard epitope interpretation). No isoforms are listed in the supplied record, so investigate epitope accessibility and processing before invoking isoform-specific staining (UniProt P01148: isoforms).
How can IF help check the cell identity of a GNRH1 IHC signal?
For a separate IF experiment, pair GNRH1 with a neuronal marker when examining hypothalamic cells, where HPA reports a stained neuronal subset (HPA: tissue IHC profile). Choose well-separated fluorophores and consider a far-red GNRH1 channel if the tissue shows substantial shorter-wavelength autofluorescence; inspect an unstained section first (standard IF practice). If the antibody recognises an intracellular precursor epitope, use controlled permeabilisation; for an accessible extracellular epitope, test staining without permeabilisation (UniProt P01148: secreted precursor; standard IF practice). Keep the IF result as a localisation check rather than assuming that the paraffin-section IHC caption validates IF performance (A02307 tissue-IHC caption).
What should I change when chromogenic background obscures GNRH1 staining?
Run a no-primary control beside the test section to distinguish detection-system staining from antibody-dependent signal (standard IHC practice). For a peroxidase and DAB workflow, check the peroxidase block, blocking step, washes and development time before changing the catalog antibody concentration (standard chromogenic IHC practice). Compare any adjustment with a positive control and with tissue HPA lists as undetected, such as heart-muscle cardiomyocytes (HPA: tissue IHC). Because the selected caption shows paraffin-embedded human heart but gives no fixation details, that image alone cannot establish the expected background in your preparation (A02307 tissue-IHC caption).
How should I score GNRH1 staining across paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and compartment before scoring, since HPA describes cytoplasmic expression in several tissues and a hypothalamic neuronal subset (HPA: tissue IHC profile). For cell-rich regions, record the percentage of positive cells and an H-score from intensity categories 0–3; for sparse neurons, report positive cells per mm² (standard IHC scoring practice). Normalise counts to the number of eligible cells or measured tissue area, and use identical staining, imaging and threshold settings across specimens (standard IHC practice). Report cytoplasmic and diffuse extracellular signal separately, because secreted GNRH1 can make cell assignment uncertain (UniProt P01148: secreted; standard IHC interpretation).
How can I distinguish genuine GNRH1 staining from an artefact?
A credible result should follow the expected cell and compartment pattern, including cytoplasmic staining in a hypothalamic neuronal subset (HPA: tissue IHC profile). Be cautious with dominant nuclear or sharp membrane-only staining, given GNRH1’s secreted annotation and lack of a transmembrane segment (UniProt P01148: subcellular location and topology). Check whether signal is confined to section edges or necrotic areas, or persists in a no-primary control; examine endogenous peroxidase activity if using DAB (standard IHC practice). The catalog image uses paraffin-embedded human heart, whereas HPA reports cardiomyocytes as undetected; resolve that difference with cell-level morphology and controls before calling cardiomyocytes positive (A02307 tissue-IHC caption; HPA: heart muscle).
Boster reagents
Best GNRH1 / Progonadoliberin-1 IHC Antibodies
Two anti-GNRH1 antibodies have IHC images from paraffin-embedded human tissue (catalog A02307 and A02307-1: image captions). Both list Human, Mouse and Rat reactivity; A02307 also lists IF/ICC (catalog applications and reactivity).
Real IHC data
Anti-GnRH I GNRH1 Antibody
Cat # A02307
Real IHC data
Anti-GnRH I (D43) GNRH1 Antibody
Cat # A02307-1
A02307 will render with its IHC image from paraffin-embedded human heart tissue; it lists IHC, IF and ICC applications and Human, Mouse and Rat reactivity (catalog A02307: image caption, applications and reactivity). A02307-1 will render with its IHC image from paraffin-embedded human colorectal carcinoma at 1:50; it lists IHC and Human, Mouse and Rat reactivity (catalog A02307-1: image caption, applications and reactivity).
Which to pick: For tissue IHC, choose A02307 for the pictured paraffin-embedded human heart sample or A02307-1 for the pictured paraffin-embedded human colorectal carcinoma sample; neither caption reports the fixative (catalog A02307 and A02307-1: image captions). For IF/ICC, choose A02307, which lists both applications; A02307-2 also lists IF/ICC but has no IHC application or IHC image (catalog A02307 and A02307-2: applications and image lists). For Human, Mouse or Rat samples, both pictured IHC antibodies list reactivity and are rabbit polyclonals, although their IHC images show only human tissue (catalog A02307 and A02307-1: reactivity, dilution records and image captions).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry P01148 (GON1_HUMAN, Progonadoliberin-1).
- Human Protein Atlas. GNRH1 tissue IHC expression (reliability: Supported).
- Human Protein Atlas. GNRH1 subcellular location (ICC-IF): Secreted.
- Human Protein Atlas. GNRH1 antibody validation summary (1 antibodies).
- Long-lasting redundant gnrh1/3 expression in GnRH neurons enabled apparent switching of paralog usage during evolution. iScience 2024 — PMC10924128.
- Study of smell and reproductive organs in a mouse model for CHARGE syndrome. European journal of human genetics : EJHG 2010 — PMC2987182.
- Changes of Sexual Behaviors in Rapamycin-injected Cichlid Fish Astatotilapia burtoni Males. Development & reproduction 2016 — PMC5078152.
- Expression of GnRH, Kisspeptin, and Their Specific Receptors in the Ovary and Uterus in Deslorelin-Treated Late-Prepubertal Bitches. Veterinary sciences 2024 — PMC11680279.
- PubMed PMID:2671939 — UniProt-cited evidence.
- PubMed PMID:2867548 — UniProt-cited evidence.
- PubMed PMID:6090951 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for GNRH1 (Progonadoliberin-1). Expected localisation Cytoplasmic staining in several tissues (HPA tissue IHC). Antigen retrieval: Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen). Validated IHC antibody: A02307 at 1:100 - 1:300 (the product's own IHC validation image is shown). Controls (HPA): positive Bronchus (Ciliated cells (ciliary rootlets)); negative Adipose tissue. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human heart tissue; fixative not specified (datasheet A02307); 2. Fixation: Image fixative and duration unreported (datasheet A02307); 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-induced epitope retrieval in citrate buffer, pH 6.0 , 20 min at 95–98 °C…; 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% normal serum of the secondary host, 30 min , room temperature (standard); 8. Primary antibody: Rabbit anti-GNRH1, 1:100 - 1:300 (datasheet A02307); 9. Primary incubation: Overnight at 4 °C (standard). Watch for: Fixation: Keep fixation consistent across paraffin sections (standard IHC practice; not target-specific); Caveat: Secreted protein may stain away from its RNA source (HPA tissue IHC); Isoform / epitope: No isoforms annotated; peptide processing may alter epitopes (UniProt); Regulation: No expression regulator specified (UniProt). Evidence: UniProt P01148, HPA tissue IHC · Supported, HPA ICC-IF · Secreted, Datasheet A02307, PMC10924128, PMC2987182. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/GNRH1/immunohistochemistry-ihc-guide.