Recombinant Olea europaea Pollen allergen Ole e 7, partial
Description
Clinical and Immunological Significance
Ole e 7 sensitization is linked to severe allergic phenotypes, particularly in regions with high olive pollen exposure . Key findings include:
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Prevalence: 14.4%–60% among olive pollen-allergic patients, depending on geographic pollen levels .
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Cross-Reactivity: Clinically relevant cross-reactivity with food nsLTPs (e.g., Pru p 3 in peach) due to structural homology .
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Disease Associations:
Table 2: Clinical Associations of Ole e 7 Sensitization
| Clinical Feature | Study Population (%) | Key Reference |
|---|---|---|
| Asthma | 24.1 (adults) | |
| Fruit Anaphylaxis | 47.9 | |
| Polysensitization (≥3 allergens) | 75 |
Component-Resolved Diagnostics (CRD)
Recombinant Ole e 7, partial, is used to:
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Identify patients with nsLTP-driven cross-reactive allergies .
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Differentiate between mild (oral allergy syndrome) and severe (anaphylaxis) food allergy phenotypes .
Table 3: IgE Reactivity in Olive Pollen-Allergic Patients
| Allergen | IgE Positivity (%) | Clinical Correlation |
|---|---|---|
| Ole e 1 | 70–80 | Mild respiratory symptoms |
| Ole e 7 | 35–60 | Severe asthma, food anaphylaxis |
| Ole e 9 | 50 | High pollen exposure regions |
Therapeutic Potential
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Immunotherapy: Not yet clinically available, but recombinant Ole e 7’s stability and IgE-binding capacity make it a candidate for hypoallergenic vaccines .
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Research Use: Facilitates studies on nsLTP cross-reactivity mechanisms and epitope mapping .
Production and Validation
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Proteomic Assembly: The natural Ole e 7 sequence was inferred via de novo mass spectrometry after tryptic digestion and LC-MS/MS analysis .
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Validation: Circular dichroism and immunoassays confirmed structural/functional equivalence to natural Ole e 7 .
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Purity: >85% by SDS-PAGE, with endotoxin levels suitable for in vitro assays .
Limitations and Future Directions
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Partial Sequence: The 21-amino-acid fragment may not capture full conformational epitopes .
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Geographic Variability: Diagnostic utility is highest in Mediterranean regions with intense olive cultivation .
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Therapeutic Gaps: Recombinant Ole e 9 and other olive pollen allergens remain challenging to produce .
