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Olfaction recognition process is extraordinarily complex in insects, and the olfactory receptors play an important function in the process. In this paper, a highly conserved olfactory co-receptor gene,  AcerOr2  (ortholog to the  Drosophila melanogaster Or83b),  cloned from the antennae of the Asian honeybee,  Apis cerana cerana  Fabricius (Hymenoptera: Apidae), using reverse transcriptase PCR and rapid amplification of cDNA ends. The full-length sequence of the gene was 1763 bp long, and the cDNA open reading frame encoded 478 amino acid residues, including 7 putative transmembrane domains. Alignment analysis revealed that  AcerOr2  shares high homology (> 74%) with similar olfactory receptors found in other Hymenoptera species. The amino acid identity with the closely related species  Apis mellifera  reached 99.8%. The developmental expression analysis using quantitative real-time reverse transcriptase PCR suggested that the  AcerOr2  transcript was expressed at a relatively low level in the larval stage, whereas it was expressed broadly in the pupal and adult stages, with a significantly high level on the days just before and after eclosion.  In situ  hybridization showed that  AcerOr2  mRNA was expressed in sensilla placodea and on the basal region of the worker antennal cuticle, in accordance with the previous conclusions that the conserved genes are expressed in most olfactory receptor neurons.

Molecular Identification and Expressive Characterization of an Olfactory Co-Receptor Gene in the Asian Honeybee,Apis cerana cerana