title: Differential expression and sequence polymorphism of the olive pollen allergen Ole e 1 in two Iranian cultivars.
abstract: Molecular evidence on the heterogeneity present in the Ole e 1 allergen of the olive pollen is emerging. Such polymorphism is dependent on the cultivar origin of pollen, which also determines wide differences in the expression of this protein. Determination of biochemical and molecular characteristics of Ole e 1 pollen allergen in two Iranian olive cultivars, namely 'Rowghani' and 'Zard' is necessary to assess their allergenicity potential. SDS-PAGE and immunoblotting analysis of pollen extracts showed that both cultivars present high and low expression of Ole e 1, respectively. These protein levels correlated with similarly different levels of transcripts, as determined by RT-PCR. Two-dimensional protein profiles also showed conspicuous differences in the distribution and the level of expression of those spots reacting to an anti-Ole e 1 antibody. Bioinformatic analysis of four Ole e 1 sequences corresponding to 'Rowghani' and two sequences for 'Zard', showed numerous heterogeneities when compared with those Ole e 1 and Ole e 1-like sequences present in databases. Nucleotide substitutions resulted in many cases in changes over the predicted amino acid sequences. A cladistic analysis of the sequences showed Iranian entries in a central position between West-European sequences, and Ole e 1-like sequences from other Oleaceae species. Moreover, amino acid changes affected key epitopes of the protein involved in the recognition of the protein by the human immune system. Putative implications of polymorphism in both the biological role and the allergic reactivity of Ole e 1 are discussed.
authors: Estación Experimental del Zaidín, CSIC, Profesor Albareda 1, 18008 Granada, Spain. juandedios.alche@eez.csic.es.
authors: Ali
authors: A
authors: Soleimani
authors: Sonia
authors: S
authors: Morales
authors: Jose Carlos
authors: JC
authors: Jimenez-Lopez
authors: Antonio Jesús
authors: AJ
authors: Castro
authors: María Isabel
authors: MI
authors: Rodríguez-García
authors: Juan
authors: J
authors: de Dios Alché
mesh_terms: D000485:Allergens / Q000145:classification / Q000235:genetics* / Q000276:immunology; D000595:Amino Acid Sequence; D000906:Antibodies / Q000737:chemistry; D052179:Antigens, Plant / Q000145:classification / Q000235:genetics* / Q000276:immunology; D001483:Base Sequence; D015153:Blotting, Western; D018506:Gene Expression Regulation, Plant; D006801:Humans; D007492:Iran; D008969:Molecular Sequence Data; D031658:Olea / Q000145:classification / Q000235:genetics* / Q000276:immunology; D010802:Phylogeny; D010936:Plant Extracts / Q000737:chemistry; D010940:Plant Proteins / Q000145:classification / Q000235:genetics* / Q000276:immunology; D011058:Pollen / Q000145:classification / Q000235:genetics* / Q000276:immunology; D011110:Polymorphism, Genetic; D012333:RNA, Messenger / Q000235:genetics / Q000276:immunology; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D000485:Allergens; D000906:Antibodies; D052179:Antigens, Plant; C081946:Ole e I protein, Olea europaea; D010936:Plant Extracts; D010940:Plant Proteins; D012333:RNA, Messenger