Project description:Asymmetric development, in which functional differences occur between left-right symmetrical organs, is widespread in organisms, including fish and mollusks. However, the asymmetry of symmetrical sensory structures in Haliotis discus hannai, a gastropod with a sensitive sensory system, remains unknown. This study analyzed the transcriptomes of three sensory structures (eyestalks, cephalic tentacles, and epipodial tentacles) to explore potential asymmetries in this species. RNA-seq revealed functional differences in sensory ability and sperm-egg recognition between right and left eyestalks, with cephalic tentacles displaying asymmetry in cytoskeletal organization and cell cycle regulation. Epipodial tentacles showed similar asymmetries, including immune response differences. Moreover, the cAMP-protein kinase A (PKA)-CREB-binding protein (CBP) signaling pathway responded asymmetrically, with PKA responding to activators and inhibitors on both sides and CBP showing a stronger response on the right. These findings provide insights into sensory asymmetry in mollusks and guidance for further investigations of the molecular mechanisms underlying asymmetry in symmetrical organs.
Project description:Pacific abalone (Haliotis discus hannai) is one of the most important aquaculture species in East Asia, and growth performance is a key trait for stable and efficient production. To better understand the molecular differences associated with growth variation in this species, we conducted transcriptome profiling of high-growth and low-growth Pacific abalone groups showing significant differences in growth traits. RNA-seq data were generated from hepatopancreas and mantle tissues to identify transcriptional variation associated with growth performance. Comparison of gene expression patterns between the two growth groups provided molecular information relevant to the biological processes and regulatory pathways underlying growth differences in Pacific abalone.
