ALDH7A1 / Alpha-aminoadipic semialdehyde dehydrogenase · IHC design guide

Design Immunohistochemistry for ALDH7A1

Plan paraffin-section ALDH7A1 staining around the cytoplasmic, mitochondrial pattern reported in most tissues (HPA tissue IHC). Use kidney proximal tubules as a high-staining reference (HPA tissue IHC), then compare cell types within each section.

Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use

Immunohistochemistry protocol sheet for ALDH7A1 (IHC for ALDH7A1): expected localisation Cytoplasmic staining with a mitochondrial pattern (HPA tissue IHC), antibody PB10038, validated IHC image, and IHC protocol steps — Printable **ALDH7A1** IHC protocol sheet — expected localisation Cytoplasmic staining with a mitochondrial pattern (HPA tissue IHC), antibody PB10038, controls and protocol steps. Open the full ALDH7A1 IHC guide →

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ALDH7A1 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 with a mitochondrial pattern (HPA tissue IHC)
	Staining pattern	Most tissues: cytoplasmic, mitochondrial-pattern staining (HPA tissue IHC)
	Antigen retrieval	Citrate pH 6 HIER, heat-mediated (datasheet PB10038)
	Positive control ⓘ	Cerebellum+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 sections. (standard IHC practice; not target-specific)
	Caveat	Staining varies by cell type, including undetected cells (HPA tissue IHC)
	Regulation	Stress and AMPK can shift membrane location (UniProt)
	Isoform / epitope	3 isoforms; mature chain starts at residue 27; epitope map unknown (UniProt)

Section 1

Recommended ALDH7A1 IHC & IF Protocols

The catalog antibody’s IHC-P protocol (datasheet PB10038) is accompanied by published ALDH7A1 protocols for ovarian tissue (PMC3458927) and liver and kidney cancer tissue (PMC6264057).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Paraffin-embedded human lung cancer tissues; fixative not specified (datasheet PB10038)
Fixation	Image fixative and duration unreported (datasheet PB10038); 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 PB10038)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% goat serum (datasheet PB10038)
Primary antibody	Rabbit anti-ALDH7A1, 0.5-1μg/ml (datasheet PB10038)
Primary incubation	Overnight at 4 °C (datasheet PB10038)
Detection	Streptavidin-biotin complex (SABC), DAB chromogen (datasheet PB10038)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	ALDH7A1-positive staining in bergmann glia - cytoplasm/membrane of cerebellum (HPA tissue IHC: High). HPA tissue profile: Cytoplasmic expression with a mitochondrial pattern in most tissues. No signal in the no-primary control.

💡Decision noteStart with heat-mediated citrate retrieval at pH 6 for the catalog antibody (datasheet PB10038). The ovarian study used pressure-cooker retrieval for 10 min (PMC3458927).

Section 2

What Is the Expected ALDH7A1 Staining Pattern?

ALDH7A1 staining should be predominantly cytoplasmic with a mitochondrial pattern in most tissues (HPA tissue IHC: Enhanced reliability). High staining is reported in kidney proximal tubules, liver cholangiocytes, placental cytotrophoblasts and cerebellar Bergmann glia (HPA tissue IHC). Cytosolic and other locations are also annotated; ALDH7A1 has no transmembrane segment (UniProt P49419: subcellular location and topology).

What am I looking at on my slide?
Granular cytoplasmic staining in kidney proximal tubule cell bodies, with limited surrounding signal (HPA tissue IHC: High in proximal tubules).	This fits the predominant mitochondrial pattern (HPA tissue IHC). Assess staining in the named cell population rather than assigning one score to the entire kidney section (HPA tissue IHC: cell-specific profile).
Strong staining in liver cholangiocytes, while neighboring cells differ in intensity (HPA tissue IHC: High in cholangiocytes).	That cell-specific distribution is compatible with the HPA image interpretation. Liver-enhanced RNA does not mean every liver cell must stain strongly (HPA: tissue-enhanced RNA in liver; High protein staining in cholangiocytes).
Predominantly nuclear staining or a continuous cell-edge outline replaces the cytoplasmic granular pattern (HPA tissue IHC: predominant pattern).	Treat this as a discordant result and check specificity and detection conditions. Nuclear and membrane locations are listed by UniProt, so their presence alone cannot prove an artifact (UniProt P49419: subcellular location).
Strong staining appears in ovarian follicle cells or lung alveolar cells (HPA tissue IHC: Not detected in those cells).	Investigate cross-reactivity or detection background before calling these cells positive. The HPA observations are cell-specific; UniProt reports ovarian tissue abundance, which does not establish follicle-cell staining (UniProt P49419: tissue specificity).
Diffuse color covers multiple cell types, including cells expected to have little or no signal (HPA tissue IHC: cell-specific profile).	This obscures compartment and cell-type interpretation. Compare a negative reagent control and reduce nonspecific detection as appropriate (general IHC practice); diffuse cytosolic signal alone can still be plausible (HPA ICC-IF: supported cytosol).

💡Expected ALDH7A1 appearanceCall a section positive when the appropriate cells show cytoplasmic, often granular mitochondrial-pattern staining—potentially High in kidney proximal tubules or liver cholangiocytes (HPA tissue IHC); widespread cell-independent color or a solely nuclear pattern warrants investigation (HPA tissue IHC: predominant pattern; UniProt P49419: nucleus also annotated).

How each factor affects the staining
Cell type and tissue	Use the named cells as comparators: Bergmann glia, proximal tubules, cholangiocytes and cytotrophoblasts are High, while ovarian follicle cells and lung alveolar cells are Not detected (HPA tissue IHC).
Compartment and cell state	Mitochondrial-pattern cytoplasm is the main IHC expectation (HPA tissue IHC). Cytosol, nucleus, and stress-associated membrane translocation are annotated, so an unusual compartment needs context rather than automatic rejection (UniProt P49419: subcellular location).
Strength of reference evidence	The tissue profile has Enhanced reliability but only medium agreement between antibody staining and RNA (HPA tissue IHC: reliability description). Two listed antibodies have Enhanced IHC status; interpret a discrepant specimen alongside controls (HPA antibodies).
Q: What should IF/ICC show?	A: Mainly mitochondria, with additional cytosol (HPA ICC-IF: supported locations). This is a localization comparison; IF/ICC has its own guide page and its images do not establish a paraffin IHC staining intensity (HPA ICC-IF; HPA tissue IHC).
Fixation sensitivity	A target-specific effect on ALDH7A1 staining is unreported in the supplied UniProt and HPA records. Select and document paraffin-section processing and retrieval conditions using general IHC practice; do not infer an ALDH7A1-specific effect from tissue levels.

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
No signal in kidney proximal tubules or liver cholangiocytes (HPA tissue IHC: High).	A run or reagent failure is possible; HPA levels alone cannot identify which step failed (HPA tissue IHC; general IHC practice).	Check section integrity, retrieval, antibody incubation and chromogenic detection against a same-run known-positive section (general IHC practice).
Ovarian follicle or lung alveolar cells stain strongly (HPA tissue IHC: Not detected).	Cross-reactivity or nonspecific detection is possible; these HPA calls apply to the specified cells (HPA tissue IHC; general IHC practice).	Review morphology and compartment; compare a negative reagent control and an appropriate positive section, then reassess antibody conditions (general IHC practice).
Chromogen is diffuse across the section and masks cellular detail.	Background from detection chemistry or insufficient blocking or washing can obscure a cell-specific pattern (general IHC practice; HPA tissue IHC: cell-specific profile).	Inspect the negative reagent control, optimize blocking and washing, and adjust detection conditions before scoring (general IHC practice).
Signal is only nuclear or forms a uniform cell-border outline (HPA tissue IHC: predominant cytoplasmic mitochondrial pattern).	The result may reflect nonspecific staining, although UniProt also annotates nucleus and stress-responsive membrane localization (UniProt P49419: subcellular location).	Check positive and negative controls and whether the expected cell types retain cytoplasmic staining; record any convincing compartment shift separately (general IHC practice; HPA tissue IHC).
Staining is weak in small-intestinal or colonic enterocytes (HPA tissue IHC: Low).	Low staining in these cells is within the HPA profile; it does not by itself establish a failed assay (HPA tissue IHC).	Use a same-run High cell population, such as kidney proximal tubules, to judge whether the assay detected ALDH7A1 (HPA tissue IHC; general IHC practice).
Observed staining varies between sections or differs from RNA expectations.	HPA reports medium consistency between antibody staining and RNA; RNA abundance does not assign an IHC score to every cell (HPA tissue IHC: reliability description).	Compare the same named cell population and section quality, score protein staining directly, and document discrepancies without treating RNA as a substitute for IHC (HPA tissue IHC; general IHC practice).

Source: UniProt P49419 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing ALDH7A1 staining

IHC analysis of ALDH7A1 using anti-ALDH7A1 antibody (PB10038). ALDH7A1 was detected in paraffin-embedded section of human lung cancer tissues. Heat mediated antigen retrieval was performed in citrate buffer (pH6, epitope retrieval solution) for 20 mins. The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 1μg/ml rabbit anti-ALDH7A1 Antibody (PB10038) overnight at 4°C. Biotinylated goat anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using Strepavidin-Biotin-Complex (SABC)(Catalog # SA1022) with DAB as the chromogen.

PB10038 · IHCIHC analysis of ALDH7A1 using anti-ALDH7A1 antibody (PB10038). ALDH7A1 was detected in paraffin-embedded section of human lung cancer tissue

IHC analysis of ALDH7A1 using anti-ALDH7A1 antibody (PB10038). ALDH7A1 was detected in paraffin-embedded section of rat brain tissues. Heat mediated antigen retrieval was performed in citrate buffer (pH6, epitope retrieval solution) for 20 mins. The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 1μg/ml rabbit anti-ALDH7A1 Antibody (PB10038) overnight at 4°C. Biotinylated goat anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using Strepavidin-Biotin-Complex (SABC)(Catalog # SA1022) with DAB as the chromogen.

PB10038 · IHCIHC analysis of ALDH7A1 using anti-ALDH7A1 antibody (PB10038). ALDH7A1 was detected in paraffin-embedded section of rat brain tissues. Heat

IF analysis of ALDH7A1 using anti-ALDH7A1 antibody (PB10038). ALDH7A1 was detected in immunocytochemical section of U20S cell. Enzyme antigen retrieval was performed using IHC enzyme antigen retrieval reagent (AR0022) for 15 mins. The cells were blocked with 10% goat serum. And then incubated with 2μg/mL rabbit anti-ALDH7A1 Antibody (PB10038) overnight at 4°C. DyLight®488 Conjugated Goat Anti-Rabbit IgG (BA1127) was used as secondary antibody at 1:100 dilution and incubated for 30 minutes at 37°C. The section was counterstained with DAPI. Visualize using a fluorescence microscope and filter sets appropriate for the label used.

PB10038 · IFIF analysis of ALDH7A1 using anti-ALDH7A1 antibody (PB10038). ALDH7A1 was detected in immunocytochemical section of U20S cell. Enzyme antige

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000164904-ALDH7A1/tissue/cerebral+cortex#imid_21010747

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000164904-ALDH7A1/tissue/colon#imid_21013273

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000164904-ALDH7A1/tissue/liver#imid_21013274

HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000164904-ALDH7A1/tissue/kidney#imid_21013275

HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA023296; green = ALDH7A1, blue = nucleus, red = microtubules.

← swipe / scroll for more images →

Real IHC / IF data behind the staining-pattern expectations in this section.

Sample controls for ALDH7A1 IHC & IF

🧪Run kidney first and score proximal tubule cell bodies for staining (HPA: High in proximal tubules). Use adipose tissue as the negative tissue, with adipocytes expected to lack detectable staining (HPA: Not detected in adipocytes); on the kidney slide, assess other cells for background staining without designating a specific kidney cell type as target-negative from these rows.

Positive control tissue: Cerebellum (Bergmann glia - cytoplasm/membrane, HPA High)

Negative control tissue: Adipose tissue (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show ALDH7A1 in A-431, U-251MG, U2OS, NIH 3T3, with annotated localisation: Mitochondria (supported) (HPA subcellular).

Technical controls: Include no-primary (secondary-only) and concentration-matched rabbit IgG isotype controls, plus ALDH7A1-knockout tissue or cells as a biological negative (selected-SKU caption: rabbit primary antibody). For kidney sections developed with the caption’s biotin-based, DAB detection, control endogenous peroxidase and biotin background (selected-SKU caption: biotinylated secondary and DAB).

⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the selected-SKU paraffin-section caption does not state a fixative (selected-SKU caption: fixative not stated). The caption uses citrate retrieval at pH 6 for 20 minutes, which provides a starting condition but does not establish that retrieval is required (selected-SKU caption: heat-mediated citrate retrieval). No supplied evidence establishes that frozen sections or IF are easier; kidney’s endogenous biotin can complicate the caption’s biotin-based detection (selected-SKU caption: biotinylated secondary).

HPA tissue IHC evidence for ALDH7A1

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.

Positive expression · recommended positive controls

Tissue	Cell type	Level	Evidence	Source
Cerebellum	Bergmann glia - cytoplasm/membrane	High	Protein (IHC)	HPA →
Kidney	Proximal tubules (cell body)	High	Protein (IHC)	HPA →
Liver	Cholangiocytes	High	Protein (IHC)	HPA →
Placenta	Cytotrophoblasts	High	Protein (IHC)	HPA →
Adrenal gland	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 →
Bone marrow	Hematopoietic cells	Not detected	Protein (IHC)	HPA →
Cervix	Squamous epithelial cells	Not detected	Protein (IHC)	HPA →
Duodenum	Endocrine cells	Not detected	Protein (IHC)	HPA →
Lung	Alveolar cells	Not detected	Protein (IHC)	HPA →

Section 3

Advanced ALDH7A1 IHC Tips

Troubleshoot ALDH7A1 staining in paraffin sections by checking retrieval, cell identity, subcellular pattern and detection controls (PB10038 tissue-IHC caption; HPA tissue IHC; HPA subcellular).

How should I retrieve ALDH7A1 in paraffin sections when staining is weak?

Start with heat-mediated retrieval in citrate buffer at pH 6 for 20 minutes (datasheet PB10038; PB10038 tissue-IHC caption). That condition was used for a paraffin section of human lung cancer stained with the catalog antibody (PB10038 tissue-IHC caption). If signal is weak, compare retrieval times on adjacent sections while keeping antibody concentration and detection conditions constant (standard IHC practice). Include a known positive cell population, such as kidney proximal tubules, to distinguish failed retrieval from genuinely low expression in the test cells (HPA: High in kidney proximal tubules; standard IHC practice).

Could fixation explain inconsistent ALDH7A1 staining between paraffin blocks?

The supplied ALDH7A1 tissue caption does not report a fixative, so target-specific fixation sensitivity is unknown (PB10038 tissue-IHC caption). Record the fixative, fixation duration and processing history for each block before comparing staining intensity (standard IHC practice). Run sections from the blocks together with the same citrate retrieval at pH 6 for 20 minutes and the same detection run (PB10038 tissue-IHC caption; standard IHC practice). If a control block stains consistently while a test block varies, assess preservation and processing artefacts before attributing the difference to ALDH7A1 biology (standard IHC practice).

Which subcellular ALDH7A1 pattern should I accept in chromogenic IHC?

Expect predominantly cytoplasmic staining with a mitochondrial pattern in tissue sections (HPA tissue IHC: cytoplasmic expression with a mitochondrial pattern in most tissues). Mitochondria are the supported main location, with cytosol also supported by cell imaging (HPA subcellular: supported mitochondria and cytosol). UniProt additionally lists membrane, Golgi membrane and nuclear locations, and reports stress-associated membrane translocation, so those patterns need biological context and independent confirmation (UniProt P49419 subcellular). Because ALDH7A1 has no transmembrane segment, an isolated crisp cell-outline signal warrants a detection-control check before being assigned to ALDH7A1 (UniProt P49419 topology; standard IHC practice).

Can an antibody distinguish ALDH7A1 isoforms or modified epitopes in tissue?

ALDH7A1 has 3 listed isoforms, numbered 1, 2 and 4, but the supplied antibody caption does not identify its epitope (UniProt P49419 isoforms; PB10038 tissue-IHC caption). UniProt lists a processed chain spanning residues 27–539 and phosphorylation at residue 130 by AMPK (UniProt P49419 processing and modified residues). Those annotations alone cannot establish whether fixation or retrieval exposes a particular isoform or modified epitope (standard IHC interpretation). Check the antibody's mapped immunogen or epitope, if available, before making isoform-specific claims; score the present staining as ALDH7A1 immunoreactivity (standard IHC practice).

How should I adapt the ALDH7A1 question to a multiplex IF experiment?

For the separate IF experiment, pair ALDH7A1 with a validated marker for the expected cell population, such as kidney proximal tubules, and assess colocalisation at the cell level (HPA: High in kidney proximal tubules; standard IF practice). Choose spectrally separated fluorophores and consider a far-red ALDH7A1 channel when tissue autofluorescence interferes with shorter wavelengths (standard IF practice). Because the supported locations are intracellular, permeabilisation is needed when the recognized epitope faces the cytosol or mitochondrial interior; its precise position is not supplied here (HPA subcellular; standard IF practice). Include single-channel and secondary-only controls when assessing apparent overlap (standard IF practice).

How can I reduce diffuse DAB background without losing ALDH7A1 signal?

The documented chromogenic workflow used 10% goat serum blocking, 1 µg/ml primary antibody overnight at 4°C, biotinylated secondary and a streptavidin–biotin complex with DAB (PB10038 tissue-IHC caption). Check a no-primary control first, then assess endogenous peroxidase blocking, endogenous biotin and nonspecific secondary binding separately (standard IHC practice). If background persists, improve washing and compare shorter DAB development while holding retrieval constant (standard IHC practice). Judge changes against a positive cell population, such as liver cholangiocytes, so a cleaner slide does not conceal lost target signal (HPA: High in liver cholangiocytes; standard IHC practice).

What should I score when ALDH7A1 staining differs across cell populations? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population before scoring: HPA reports High staining in kidney proximal tubules and no detection in lung alveolar cells (HPA tissue IHC). For each compartment, record the percentage of positive viable cells and an H-score using intensity grades 0–3, yielding a 0–300 scale (standard IHC scoring practice). If counting discrete positive cells, report density per mm² of evaluable tissue and also provide the target-cell denominator (standard IHC quantification practice). Apply identical retrieval, imaging and DAB scoring criteria across sections, and exclude necrotic or damaged regions from the denominator (standard IHC practice).

How do I distinguish genuine ALDH7A1 staining from tissue artefact?

A plausible positive follows the expected cell population and predominantly cytoplasmic, mitochondrial-like distribution (HPA tissue IHC: cell-specific levels and cytoplasmic mitochondrial pattern). Compare suspicious staining with a no-primary control to identify endogenous enzyme signal or detection background (standard chromogenic IHC practice). Treat strong staining confined to section edges or necrotic areas as suspect, especially when intact interior cells lack the same pattern (standard IHC practice). An isolated cell-outline or nuclear signal needs independent corroboration before interpretation, despite UniProt listing additional membrane and nuclear locations (UniProt P49419 subcellular; standard IHC practice).

Boster reagents

Best ALDH7A1 / Alpha-aminoadipic semialdehyde dehydrogenase IHC Antibodies

PB10038 has IHC images from human lung cancer and rat brain paraffin sections and IF images from U20S cells (PB10038 image captions); its listed reactivity includes human, mouse and rat (PB10038 catalog).

Real IHC data

Anti-ALDH7A1 Antibody ®

Cat # PB10038

View product →

PB10038 is listed for IHC and IF/ICC (PB10038 catalog), with images from human lung cancer and rat brain paraffin sections and U20S cells (PB10038 image captions). M03712-1 is a rabbit monoclonal listed for human IHC, with no IHC image supplied (M03712-1 catalog).

Which to pick: For paraffin-section IHC, choose PB10038 when an example matters: its images show human lung cancer and rat brain sections, citrate retrieval and 1 μg/ml primary antibody; the fixative is unreported (PB10038 IHC image captions). For IF/ICC, choose PB10038 because it is listed for both applications and has a U20S cell IF image; M03712-1 is listed for IHC but not IF/ICC (PB10038 and M03712-1 catalogs; PB10038 IF image caption). For work across species, PB10038 lists human, mouse and rat reactivity, although its supplied paraffin images cover human and rat; M03712-1 lists human reactivity and is monoclonal (PB10038 IHC image captions; PB10038 and M03712-1 catalogs).

Each figure is that product's own IHC / IF validation image from its datasheet.

References

UniProt Consortium. UniProt entry P49419 (AL7A1_HUMAN, Alpha-aminoadipic semialdehyde dehydrogenase).
Human Protein Atlas. ALDH7A1 tissue IHC expression (reliability: Enhanced).
Human Protein Atlas. ALDH7A1 subcellular location (ICC-IF): Mainly localized to the mitochondria. In addition localized to the cytosol..
Human Protein Atlas. ALDH7A1 antibody validation summary (2 antibodies).
Characterization of aldehyde dehydrogenase isozymes in ovarian cancer tissues and sphere cultures. BMC cancer 2012 — PMC3458927.
Metabolic control of PPAR activity by aldehyde dehydrogenase regulates invasive cell behavior and predicts survival in hepatocellular and renal clear cell carcinoma. BMC cancer 2018 — PMC6264057.
Overall survival of pancreatic ductal adenocarcinoma is doubled by Aldh7a1 deletion in the KPC mouse. Theranostics 2021 — PMC7847681.
ALDH7A1 expression is associated with recurrence in patients with surgically resected non-small-cell lung carcinoma. Future oncology (London, England) 2013 — PMC5341386.
PubMed PMID:8088832 — UniProt-cited evidence.
PubMed PMID:14702039 — UniProt-cited evidence.
PubMed PMID:15372022 — UniProt-cited evidence.