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GRSF1 / G-rich sequence factor 1 · IHC design guide
Design Immunohistochemistry for GRSF1
Plan chromogenic IHC for GRSF1 using the catalog antibody at 2–5 μg/ml (datasheet A07576-2). Compare granular cytoplasmic staining with high staining in colon glandular cells (HPA tissue IHC).
Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use
GRSF1 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 | Granular cytoplasm in tissue (HPA tissue IHC); mitochondrial matrix location (UniProt) | |
| Staining pattern | Granular cytoplasm in glandular and epithelial cells (HPA tissue IHC) | |
| Antigen retrieval | EDTA pH 8.0 HIER, heat-mediated (datasheet A07576-2) | |
| Positive control | Adrenal gland+4 more · see all | |
| Negative control | None in HPA (detected in all 45 tissues); use no-primary + isotype controls |
Important caveats
Reasons your staining may differ from the expected pattern.
| Fixation | Keep fixation consistent across sections (standard IHC practice; not target-specific); target-specific effects are uncertain. | |
| Caveat | Staining awaits external verification (HPA tissue IHC) | |
| Regulation | Skeletal muscle RNA is tissue enhanced (HPA tissue RNA) | |
| Isoform / epitope | 2 isoforms; mature chain 118–480; epitope unspecified (UniProt; datasheet A07576-2) |
Section 1
Recommended GRSF1 IHC & IF Protocols
The catalog antibody uses EDTA pH 8.0 retrieval (datasheet A07576-2). The published IHC protocols below report staining conditions for tissue sections (PMC8742353; PMC8485391; PMC11179673).
| Sample | Paraffin-embedded human pancreatic cancer tissue; fixative not specified (datasheet A07576-2) |
| Fixation | Image fixative and duration unreported (datasheet A07576-2); 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 A07576-2); 20 min, 95–100 °C (standard) |
| Peroxidase block | 3% H2O2, 10 min, room temperature (standard) |
| Blocking | 10% goat serum (datasheet A07576-2) |
| Primary antibody | Rabbit anti-GRSF1, 2-5μg/ml (datasheet A07576-2) |
| Primary incubation | Overnight at 4 °C (datasheet A07576-2) |
| Detection | Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A07576-2) |
| Counterstain | Hematoxylin, blue, dehydrate and mount (standard) |
| Expected result | GRSF1-positive staining in glandular cells of adrenal gland (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression with a granular pattern. No signal in the no-primary control. |
💡Decision noteStart with heat-mediated EDTA pH 8.0 for the catalog antibody (datasheet A07576-2). EDTA pH 9.0 is a published alternative (PMC8485391 methods).
Section 2
What Is the Expected GRSF1 Staining Pattern?
GRSF1 is found in the mitochondrial matrix and in the cytoplasm, with enrichment in mitochondrial RNA granules (UniProt Q12849). In paraffin tissue sections, expect granular cytoplasmic staining, including strong staining in several epithelial and glandular cell populations (HPA tissue IHC). HPA rates the tissue staining reliability as Enhanced, while reporting medium agreement with RNA data and pending external verification (HPA tissue IHC). GRSF1 has no transmembrane segment (UniProt Q12849 topology).
| Granular cytoplasmic staining in colon or duodenal glandular cells, or kidney tubule cells (HPA tissue IHC). | This fits the reported High staining in those cells and the general granular cytoplasmic profile (HPA tissue IHC). Record the cell type, distribution and intensity; a mitochondrial matrix location does not require every granule to resolve as a separate organelle by chromogenic IHC (UniProt Q12849; general IHC practice). |
| Predominantly nuclear, surface-restricted or extracellular staining, with little granular cytoplasmic signal. | These are discordant with the reported tissue pattern and mitochondrial matrix/cytoplasmic localization (HPA tissue IHC; UniProt Q12849). Treat the result as a possible staining artefact and check controls and detection conditions before assigning a new localization (general IHC practice). |
| Strong staining confined to an unexpected cell population while an expected High population is weak. | Consider cross-reactivity or endogenous detection activity, especially if the signal ignores tissue boundaries or appears in a no-primary control (general IHC practice). HPA lists specific High populations; it does not make every other cell type negative (HPA tissue IHC). |
| Diffuse color over cells, stroma or the whole section obscures individual cytoplasmic granules. | This cannot be scored confidently as the reported granular profile (HPA tissue IHC). Check no-primary and detection controls, blocking, washes and development time for nonspecific background or endogenous activity (general IHC practice). |
| No staining in an intact section containing an expected High population, such as colon glandular cells (HPA tissue IHC). | First suspect an assay or section problem and inspect the positive control, antibody dilution, retrieval and detection steps (general IHC practice). Absence in one section does not overturn the reported High population; HPA provides no designated negative tissue in this payload (HPA tissue IHC). |
💡Expected GRSF1 appearanceCall a positive result when expected cells show distinct, preferably strong granular cytoplasmic staining (HPA tissue IHC); predominantly nuclear or uniform background color is suspect (UniProt Q12849; general IHC practice).
| Cell and tissue context | HPA reports High staining in adrenal, colon, duodenum and gallbladder glandular cells, esophageal squamous epithelium, kidney tubules, lymph-node germinal centers and nasopharyngeal respiratory epithelium (HPA tissue IHC). Its Low entries, including liver cholangiocytes and adipocytes, are weaker comparison sites, not validated negative controls (HPA tissue IHC). |
| Localization and resolution | GRSF1 localizes to the mitochondrial matrix and mitochondrial RNA granules near nucleoids (UniProt Q12849). HPA describes tissue IHC as generally granular and cytoplasmic (HPA tissue IHC). Routine chromogenic IHC may show a granular field without resolving individual mitochondrial granules (general IHC practice). |
| Antibody evidence and limits | Two listed antibodies, HPA036984 and HPA036985, have Enhanced IHC ratings (HPA antibodies). The tissue profile has medium consistency with RNA expression and awaits external verification (HPA tissue IHC). Match the tested antibody and local controls before treating the profile as universal (general IHC practice). |
| Isoforms, processing and epitope | UniProt records two isoforms and a chain spanning residues 118–480, with no transmembrane segment (UniProt Q12849). The supplied sources do not locate the antibody epitopes or establish equal recognition of both isoforms; do not infer a staining difference from processing alone. |
| Detection chemistry | Endogenous enzyme activity or nonspecific detection can produce color independent of primary-antibody binding; no-primary and detection controls help identify it (general IHC practice). The supplied HPA observations do not establish that any particular tissue's staining is caused by endogenous activity (HPA tissue IHC). |
| IF/ICC Q&A: What pattern should IF show? | Mitochondrial fluorescence is the reported ICC-IF pattern, with an enhanced main-location rating (HPA subcellular). This supports a localization cross-check for IHC; it does not specify a paraffin-section IF protocol or prove that every cytoplasmic IHC granule is mitochondrial (HPA subcellular; general IHC practice). |
| Fixation sensitivity | Target-specific effects of fixation on GRSF1 staining are unreported in the supplied UniProt and HPA records. If a paraffin run fails, review the local fixation and retrieval workflow as a general IHC check without assigning GRSF1-specific sensitivity (general IHC practice). |
| Situation | Likely cause | Next action |
|---|---|---|
| Expected High cells are blank, including the positive-control section (HPA tissue IHC). | An assay-wide failure is plausible; this result alone cannot establish absent GRSF1 (general IHC practice). | Check section integrity, antibody preparation and dilution, retrieval, detection reagents and control performance; repeat with a documented High tissue population (HPA tissue IHC; general IHC practice). |
| Only a small, variable subset of cells stains in an expected High population (HPA tissue IHC). | Uneven section treatment or detection can create patchy staining; biological variation remains possible (general IHC practice). | Compare replicate sections and a same-run positive control, then inspect section adhesion, reagent coverage and development consistency (general IHC practice). |
| Signal is mainly nuclear or extracellular instead of granular cytoplasmic (HPA tissue IHC). | The distribution conflicts with the reported matrix/cytoplasmic location and may reflect nonspecific staining (UniProt Q12849; general IHC practice). | Review no-primary controls, antibody concentration, blocking and washes; score GRSF1 only where the expected cell and compartment pattern is credible (general IHC practice). |
| Stroma and many unrelated cells stain uniformly. | Diffuse background or endogenous detection activity may be masking the cell-specific profile (general IHC practice; HPA tissue IHC). | Compare no-primary and detection controls, strengthen appropriate blocking or washing, and avoid interpreting uniform color as a granular positive result (general IHC practice). |
| A Low-listed population stains as strongly as a High-listed population (HPA tissue IHC). | Run conditions, tissue variation or nonspecific signal could explain the discrepancy; HPA levels are observations, not fixed scoring thresholds (HPA tissue IHC; general IHC practice). | Confirm cell identity and compare both populations on a controlled run; inspect background and antibody specificity before calling a biological difference (general IHC practice). |
| IHC is granular, but a companion ICC-IF image appears nonmitochondrial. | The assays may differ in sample preparation or specificity; HPA reports mitochondrial ICC-IF localization (HPA subcellular; general IHC practice). | Recheck compartment assignment and controls in each assay independently; do not use IF as an unprovided IHC protocol or assume that one image validates every tissue granule (general IHC practice). |
Experiment evidence
IHC & IF images showing GRSF1 staining
A07576-2 · IHCIHC analysis of GRSF1 using anti-GRSF1 antibody (A07576-2). GRSF1 was detected in paraffin-embedded section of human pancreatic cancer tissu
A07576-2 · IHCIHC analysis of GRSF1 using anti-GRSF1 antibody (A07576-2). GRSF1 was detected in paraffin-embedded section of human prostate cancer tissue.
A07576-2 · IFIF analysis of GRSF1 using anti-GRSF1 antibody (A07576-2). GRSF1 was detected in immunocytochemical section of MCF-7 cells. Enzyme antigen r
HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000132463-GRSF1/tissue/cerebral+cortex#imid_9247400
HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000132463-GRSF1/tissue/colon#imid_9247334
HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000132463-GRSF1/tissue/liver#imid_9247335
HPA · PancreasHuman Protein Atlas IHC, Pancreas. Source: https://www.proteinatlas.org/ENSG00000132463-GRSF1/tissue/pancreas#imid_9247286
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA036984; green = GRSF1, blue = nucleus, red = microtubules.
HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA036984; green = GRSF1, blue = nucleus, red = microtubules.
← swipe / scroll for more images →
Real IHC / IF data behind the staining-pattern expectations in this section.
Sample controls for GRSF1 IHC & IF
🧪Run colon first and score glandular cells, which HPA rates High for GRSF1 (HPA: High in colon glandular cells). HPA detects GRSF1 in all 45 scored tissues, so there is no supported negative tissue; use no-primary and isotype controls, and treat cells without visible staining on the positive slide as local background rather than a validated negative cell population (HPA: no negative tissue rows; detected in all 45 scored tissues).
Positive control tissue: Adrenal gland (Glandular cells, HPA High)
Negative control tissue: None in HPA: GRSF1 is detected in all 45 scored tissues. Use a no-primary (secondary-only) and an isotype control instead.
ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show GRSF1 in A-431, U-251MG, U2OS, with annotated localisation: Mitochondria (enhanced) (HPA subcellular).
Technical controls: Include a no-primary, secondary-only section, a rabbit IgG isotype control matched to the primary antibody’s clonality, and GRSF1 knockout material as a biological negative (caption: rabbit anti-GRSF1 primary; standard IHC controls). For colon IHC, block endogenous peroxidase and check for endogenous biotin background when using the caption’s biotin-based detection system (caption: biotinylated secondary and SABC–DAB detection; standard IHC practice).
⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected A07576-2 paraffin-section caption does not state the fixative (caption: fixative unreported). Heat retrieval in EDTA at pH 8.0 is documented for that IHC example, but its necessity is unestablished (caption: heat-mediated EDTA retrieval). The supplied evidence does not establish whether frozen sections or IF are easier; IF/ICC images support mitochondrial localization, while colon IHC scoring should account for endogenous peroxidase or biotin background (HPA: mitochondria in ICC-IF; caption: biotin-based DAB detection; standard IHC practice).
HPA tissue IHC evidence for GRSF1
Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — Medium 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 |
|---|---|---|---|---|
| Adrenal gland | Glandular cells | High | Protein (IHC) | HPA → |
| Colon | Glandular cells | High | Protein (IHC) | HPA → |
| Duodenum | Glandular cells | High | Protein (IHC) | HPA → |
| Esophagus | Squamous epithelial cells | High | Protein (IHC) | HPA → |
| Gallbladder | Glandular cells | High | Protein (IHC) | HPA → |
Undetected expression · recommended negative controls
| Tissue | Cell type | Level | Evidence | Source |
|---|---|---|---|---|
| None in HPA: GRSF1 is detected in all 45 scored tissues. Use a no-primary (secondary-only) and an isotype control instead. | ||||
Section 3
Advanced GRSF1 IHC Tips
Troubleshoot GRSF1 staining in paraffin sections by checking retrieval, compartment, controls, and scoring before interpreting chromogenic signal.
Which retrieval condition should I start with for GRSF1 paraffin sections?
Start with heat-mediated retrieval in EDTA at pH 8.0 for the catalog antibody (datasheet A07576-2). The selected paraffin-section image used that condition, followed by 10% goat serum block and 2 μg/mL primary antibody overnight at 4°C (datasheet A07576-2). If signal is weak, compare retrieval duration on adjacent sections while holding antibody concentration and development time constant (standard IHC practice). Check tissue integrity and nonspecific staining alongside signal: harsh heating can damage morphology, making granular cytoplasmic staining harder to judge (standard IHC practice; HPA: general cytoplasmic expression with a granular pattern).
How should I troubleshoot fixation when GRSF1 staining is weak?
The selected image documents a paraffin-embedded section but does not state its fixative, so GRSF1-specific fixation sensitivity is unknown (datasheet A07576-2). Record the fixative and fixation duration for each specimen, then compare similarly processed sections using the same EDTA pH 8.0 retrieval and 2 μg/mL primary concentration (datasheet A07576-2; standard IHC practice). Include a known staining section in each run to distinguish a specimen-processing problem from a reagent or detection problem (standard IHC practice). Do not attribute weak staining to GRSF1's mitochondrial location, phosphoserines, or isoforms without a controlled fixation comparison (UniProt Q12849; standard IHC practice).
What staining pattern should count as plausible GRSF1 localisation?
Expect predominantly granular cytoplasmic staining in paraffin sections, consistent with the tissue IHC profile (HPA: general cytoplasmic expression with a granular pattern). GRSF1 localizes to the mitochondrial matrix and mitochondrial RNA granules near nucleoids, while a cytoplasmic location is also annotated (UniProt Q12849). Judge fine cytoplasmic granules against cell boundaries and morphology on the counterstained section, rather than calling every dark punctum positive (standard IHC practice). If a section shows only crisp nuclear staining, examine retrieval, counterstain, and detection controls before assigning it to GRSF1; its annotated locations do not establish a nuclear pattern (UniProt Q12849; standard IHC practice).
Could isoforms or epitope accessibility explain discordant GRSF1 staining?
GRSF1 has 2 annotated isoforms, but the supplied product image does not identify the antibody epitope or show isoform-specific staining (UniProt Q12849; datasheet A07576-2). The annotated chain spans residues 118–480, with RNA recognition motifs at 122–246, 250–326, and 401–480 (UniProt Q12849). Phosphoserines at positions 244 and 335 are annotated, yet their effect on this antibody's paraffin-section staining is unreported (UniProt Q12849; datasheet A07576-2). Compare staining with an independently characterized epitope, if available, before interpreting discordant samples as isoform or modification differences (standard IHC practice).
How can IF help resolve ambiguous GRSF1 chromogenic staining?
Use IF as a separate localization check, since this page's selected antibody evidence is a paraffin-section chromogenic assay (datasheet A07576-2). Multiplex GRSF1 with a marker for the cell type being evaluated and, where useful, a mitochondrial marker; assess whether puncta occur within the expected cells and mitochondrial compartment (standard IF practice; UniProt Q12849; HPA: mitochondria). Choose spectrally separated fluorophores and a channel with low tissue autofluorescence, then inspect single-stain and no-primary controls before interpreting overlap (standard IF practice). Because GRSF1 is annotated in the mitochondrial matrix and has no transmembrane segment, optimize permeabilisation to give antibody access across cellular and mitochondrial membranes without losing morphology (UniProt Q12849; standard IF practice).
How do I reduce diffuse or granular background in GRSF1 IHC?
First compare the stained section with a no-primary control; granular background can resemble the reported cytoplasmic GRSF1 pattern (standard IHC practice; HPA: general cytoplasmic expression with a granular pattern). The selected assay used 10% goat serum, 2 μg/mL primary overnight at 4°C, a biotinylated secondary, and DAB development (datasheet A07576-2). If background persists, optimize blocking, washing, primary concentration, and DAB development one variable at a time while retaining EDTA pH 8.0 retrieval as the starting condition (standard IHC practice; datasheet A07576-2). Include endogenous peroxidase and biotin controls where relevant to the detection system, and reject signal reproduced without primary antibody (standard IHC practice; datasheet A07576-2).
How should I score GRSF1 across paraffin sections? ⚠ ANSWER MARKED FOR VERIFICATION
Define the cell population and viable tissue region before scoring, because the reported pattern is granular cytoplasmic rather than a uniform field stain (HPA: general cytoplasmic expression with a granular pattern; standard IHC practice). An H-score can combine the percentage of positive cells at intensity grades 0–3; alternatively, report percentage-positive cells or positive-cell density per mm² (standard IHC practice). Apply identical thresholds, counterstain settings, and region rules across slides, with the same positive and no-primary controls in each staining run (standard IHC practice). Normalize counts to the number of eligible cells or viable tissue area, and report cell-type composition when comparing specimens (standard IHC practice).
When should I distrust an apparent GRSF1-positive result?
A plausible result is granular cytoplasmic staining in intact cells, consistent with the tissue profile and mitochondrial localization (HPA: general cytoplasmic expression with a granular pattern; UniProt Q12849). Check that the stained cell type matches the region scored: high staining is reported in kidney tubule cells and colon glandular cells, whereas low staining is reported in liver cholangiocytes (HPA: tissue IHC). Treat staining confined to section edges, necrotic areas, or cells with disrupted morphology as suspect until it reproduces in intact tissue (standard IHC practice). Nuclear-only signal or DAB precipitate also warrants review, particularly if no-primary or endogenous peroxidase controls show similar staining (UniProt Q12849; standard IHC practice).
Boster reagents
Best GRSF1 / G-rich sequence factor 1 IHC Antibodies
Anti-GRSF1 IHC data show human pancreatic and prostate cancer paraffin sections (A07576-2 IHC captions); IF data show MCF-7 cells (A07576-2 IF caption).
Real IHC data
Anti-GRSF1 Antibody ®
Cat # A07576-2
A07576-2 is the only SKU with a card and its own IHC figure; its captions show staining in human pancreatic and prostate cancer paraffin sections (A07576-2 IHC captions). Its IF caption shows staining in MCF-7 cells (A07576-2 IF caption).
Which to pick: Choose A07576-2 for tissue IHC because its own captions document paraffin sections; the fixative is unreported (A07576-2 IHC captions). For IF/ICC, A07576-2 has an MCF-7 IF image, while monoclonal M07576-1 lists both IF/ICC and IHC without an IHC image (A07576-2 IF caption; M07576-1 catalog). For cross-species IF/ICC, consider monoclonal M07576, which lists human, mouse and rat reactivity but does not list IHC (M07576 catalog).
Each figure is that product's own IHC / IF validation image from its datasheet.
References
- UniProt Consortium. UniProt entry Q12849 (GRSF1_HUMAN, G-rich sequence factor 1).
- Human Protein Atlas. GRSF1 tissue IHC expression (reliability: Enhanced).
- Human Protein Atlas. GRSF1 subcellular location (ICC-IF): Localized to the mitochondria..
- Human Protein Atlas. GRSF1 antibody validation summary (2 antibodies).
- The RNA-binding protein GRSF1 promotes hepatocarcinogenesis via competitively binding to YY1 mRNA with miR-30e-5p. Journal of experimental & clinical cancer research : CR 2022 — PMC8742353.
- Network-based approach to identify prognosis-related genes in tamoxifen-treated patients with estrogen receptor-positive breast cancer. Bioscience reports 2021 — PMC8485391.
- Metabolic Heterogeneity of Tumor Cells and its Impact on Colon Cancer Metastasis: Insights from Single-Cell and Bulk Transcriptome Analyses. Journal of Cancer 2024 — PMC11212087.
- Guanine-Rich RNA Sequence Binding Factor 1 Deficiency Promotes Colorectal Cancer Progression by Regulating PI3K/AKT Signaling Pathway. Cancer management and research 2024 — PMC11179673.
- PubMed PMID:8036161 — UniProt-cited evidence.
- PubMed PMID:14702039 — UniProt-cited evidence.
- PubMed PMID:15815621 — UniProt-cited evidence.
Immunohistochemistry protocol sheet for GRSF1 (G-rich sequence factor 1). Expected localisation Granular cytoplasm in tissue (HPA tissue IHC); mitochondrial matrix location (UniProt). Antigen retrieval: EDTA pH 8.0 HIER, heat-mediated (datasheet A07576-2). Validated IHC antibody: A07576-2 at 2-5μg/ml (the product's own IHC validation image is shown). Controls (HPA): positive Adrenal gland (Glandular cells); negative None in HPA (detected in all 45 tissues); use no-primary + isotype controls. IHC-P workflow on paraffin sections; fixative unspecified. Protocol steps: 1. Sample: Paraffin-embedded human pancreatic cancer tissue; fixative not specified (datasheet A07576-2); 2. Fixation: Image fixative and duration unreported (datasheet A07576-2); 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 A07576-2); 20 min, 95–100 °C (standard); 6. Peroxidase block: 3% H2O2, 10 min , room temperature (standard); 7. Blocking: 10% goat serum (datasheet A07576-2); 8. Primary antibody: Rabbit anti-GRSF1, 2-5μg/ml (datasheet A07576-2); 9. Primary incubation: Overnight at 4 °C (datasheet A07576-2). Watch for: Fixation: Keep fixation consistent across sections (standard IHC practice; not target-specific); target-specific effects are uncertain.; Caveat: Staining awaits external verification (HPA tissue IHC); Isoform / epitope: 2 isoforms; mature chain 118–480; epitope unspecified (UniProt; datasheet A07576-2); Regulation: Skeletal muscle RNA is tissue enhanced (HPA tissue RNA). Evidence: UniProt Q12849, HPA tissue IHC · Enhanced, HPA ICC-IF · mitochondria., Datasheet A07576-2, PMC8742353, PMC8485391. QR code links to https://www.bosterbio.com/bosterbio-gene-info-cards/GRSF1/immunohistochemistry-ihc-guide.