Autophagy and ubiquitination in important swine viral infections: Host defense and viral antagonism.

Swine viral infections continue to impose major economic and animal-health burdens worldwide, with pathogens such as porcine epidemic diarrhea virus (PEDV), African swine fever virus (ASFV), and porcine reproductive and respiratory syndrome virus (PRRSV) causing recurrent outbreaks. Autophagy and ubiquitination are central degradative pathways that act as double-edged swords, serving both host defense and viral exploitation. In this narrative review, we synthesize recent advances showing how these pathogens manipulate ubiquitin - autophagy circuits while host cells counteract through selective autophagy. We propose an autophagy - metabolism - immunity triad that positions autophagy as a hub linking infection, metabolic reprogramming, and immune evasion. This integrated framework moves beyond the traditional view of autophagy as strictly antiviral or pro-viral. Deciphering how viruses hijack ubiquitin - autophagy axes reveals actionable therapeutic targets and translational opportunities for antivirals, adjuvants, and metabolic interventions to reduce the burden of swine viral diseases.