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Design and optimization of mRNA vaccine candidates against major aquaculture pathogens using computational immunology and synthetic biology.
Current mRNA vaccines require ultra-cold chain maintenance (−80°C), making deployment in remote deep-sea aquaculture facilities impractical. This research gap addresses engineering self-assembling lipid nanoparticles with intrinsic thermal stability for deployment in uncontrolled aquatic environments.
Aquaculture species have evolved codon usage biases distinct from mammalian models, yet mRNA vaccine design lacks species-specific codon optimization protocols. This gap limits translation efficiency and immunogenicity in target fish species.
Fish possess robust mucosal immune systems at gill and intestinal barriers, yet current mRNA vaccines target systemic immunity via injection. This research gap explores using engineered microalgae as biodegradable mRNA carriers for oral administration, mimicking natural pathogen exposure routes.
Wild fish populations and aquaculture systems face simultaneous infections from multiple co-circulating pathogens (e.g., viral hemorrhagic septicemia virus, infectious pancreatic necrosis virus, bacterial kidney disease), yet single-antigen mRNA vaccines dominate current research. This gap addresses rational design of multivalent mRNA constructs maintaining immunogenicity.
Self-amplifying RNA technology amplifies vaccine signal without DNA integration, but immunotoxicity profiles in fish (with lower inflammatory thresholds than mammals) remain completely uncharacterized. This gap addresses establishing safe amplification thresholds for aquaculture species.
Current aquaculture mRNA vaccines distribute broadly, but targeted delivery to primary immune organs (spleen, head kidney) in fish would concentrate immunogenicity. This gap addresses engineering nanoparticle surfaces with fish-specific immune cell ligands for targeted trafficking.
Fish with persistent viral infections (e.g., viral nervous necrosis in sea bass) develop T cell exhaustion phenotypes (high PD-1/PD-L1 expression), limiting vaccine efficacy. This gap addresses epigenetic interventions (histone deacetylase inhibitors, DNA methyltransferase modulators) to restore T cell function alongside mRNA immunization.
Fish gut microbiota composition dramatically influences vaccine efficacy, yet polyculture systems (mixed species farming) create variable and unpredictable microbiota landscapes. This gap addresses characterizing microbiota-dependent mRNA vaccine response across co-cultured species and designing microbiota-agnostic vaccine formulations.