Abstract
Pigs play an important role in agriculture and biomedicine. The globally developing swine industry must address the challenges presented by swine-origin viruses, including ASFV (African swine fever virus), PRRSV (porcine reproductive and respiratory syndrome virus), PEDV (porcine epidemic diarrhea virus), PRV (pseudorabies virus), CSFV (classical swine fever virus), TGEV (transmissible gastroenteritis virus), et al. Despite sustained efforts by many government authorities, these viruses are still widespread. Currently, gene-editing technology has been successfully used to generate antiviral pigs, which offers the possibility for increasing animal disease tolerance and improving animal economic traits in the future. Here, we summarized the current advance in knowledge regarding the host factors in virus infection and the current status of genetically modified pigs that are resistant to virus infection in the world. There has not been any report on PEDV-resistant pigs, ASFV-resistant pigs, and PRV-resistant pigs owing to the poor understanding of the key host factors in virus infection. Furthermore, we summarized the remaining problems in producing virus-resistant pigs, and proposed several potential methods to solve them. Using genome-wide CRISPR/Cas9 library screening to explore the key host receptors in virus infection may be a feasible method. At the same time, exploring the key amino acids of host factors in virus infection with library screening based on ABEs and CBEs (Bes) may provide creative insight into producing antiviral pigs in the future.
Highlights
Publisher’s Note: MDPI stays neutralPigs, as one of the most important types of livestock, play an indispensable role in agriculture
The globally developing swine industry must address the challenges represented by swine-origin viruses, including African swine fever virus (ASFV), porcine reproductive and respiratory syndrome virus (PRRSV), porcine epidemic diarrhea virus (PEDV), PRV, CSFV, transmissible gastroenteritis virus (TGEV), et al In recent decades, vaccines against porcine viral diseases have been developed to enhance the adaptive immunity of hosts [4,5]
There are many pigs resistant to CSFV, PRRSV, and TGEV being produced, which suggested the enormous potential of CRISPR/Cas9-based gene-editing technology for shortening the breeding cycle and enhancing disease tolerance in pigs
Summary
As one of the most important types of livestock, play an indispensable role in agriculture. It is critical to maintain the stability of the swine industry for the benefits of the agricultural and biomedicine industries To this end, the globally developing swine industry must address the challenges represented by swine-origin viruses, including ASFV, PRRSV, PEDV, PRV, CSFV, TGEV, et al. In recent decades, vaccines against porcine viral diseases have been developed to enhance the adaptive immunity of hosts [4,5]. The live attenuated vaccines and the marker DIVA vaccines result in subclinical infection and immunosuppression, which makes it even harder to eliminate CSFV. As a result, another strategy is urgently needed to control the virus in pigs
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