# Targeted Integration of siRNA against Porcine Cytomegalovirus (PCMV) Enhances the Resistance of Porcine Cells to PCMV

## TL;DR

Scientists used gene editing to make pig cells more resistant to a virus called PCMV, which could help improve pig-to-human transplants.

## Contribution

The study demonstrates RNAi and CRISPR/Cas9 can be combined to create antiviral pig cells by targeting PCMV.

## Key findings

- Genetically edited pig cells effectively limited PCMV replication in vitro.
- RNA interference combined with CRISPR/Cas9 shows potential for generating antiviral pig cells.
- Gene editing was successfully performed at two different loci in pigs.

## Abstract

In the world’s first pig-to-human cardiac cytomegalovirus (PCMV), xenotransplant and elevated levels of porcine key factors contributing to patient mortality were considered. This has renewed attention on PCMV, a virus widely prevalent in pigs. Currently, there are no effective drugs or vaccines targeting PCMV, and its high detection difficulty poses challenges for prevention and control research. In this study, antiviral small hairpin RNA (shRNA) was selected and inserted into the Rosa26 and miR-17-92 loci of pigs via a CRISPR/Cas9-mediated knock-in strategy. Further in vitro viral challenge experiments demonstrated that these genetically edited pig cells could effectively limit PCMV replication. Through this process, we constructed a PCMV-infected cell model, validated partial viral interference sites, enhanced gene knock-in efficiency, performed gene editing at two different gene loci, and ultimately demonstrated that RNA interference (RNAi) technology combined with CRISPR/Cas9 has the potential to generate pig cells with enhanced antiviral infection capabilities. This opens up possibilities for the future production of pig populations with antiviral functionalities.