Odorant Binding Proteins in Tribolium castaneum: Functional Diversity and Emerging Applications

Tribolium castaneum, the red flour beetle, is both a major pest of stored products and a valuable genetic model. Odorant Binding Proteins (OBPs), traditionally associated with olfaction, are now recognized as multifunctional, contributing to detoxification, immunity, and reproduction. This review synthesizes recent advances in the molecular structure, gene expression, and functional characterization of T. castaneum OBPs-particularly TcOBPC11, TcOBPC12, TcOBPC17, and TcOBP7G. Experimental evidence, including RNA interference, ligand-binding assays, and expression profiling, supports their role in defense against xenobiotics. Comparative genomic analyses reveal lineage-specific expansions and adaptive evolution, especially in Minus-C OBPs. Translational applications include RNA interference (RNAi)-based pest control, OBP-targeting repellents, and biosensors. Outstanding challenges remain, including structural resolution and functional redundancy. Future research integrating CRISPR, single-cell transcriptomics, and structural biology will be critical to decode OBP regulatory networks and leverage their potential in pest management and biotechnology.