# Pig-L mediates virulence, biofilm formation, and oxidative stress tolerance in Clostridioides difficile

## TL;DR

This study shows that the pig-L gene in Clostridioides difficile is essential for its harmful effects, biofilm formation, and resistance to stress.

## Contribution

The study identifies pig-L as a key regulator of C. difficile virulence and stress tolerance through gene knockout and proteomic analysis.

## Key findings

- Deleting the pig-L gene reduced C. difficile virulence and biofilm formation.
- The pig-L knockout strain showed increased susceptibility to oxidative stress.
- Proteomic analysis revealed 170 upregulated and 101 downregulated proteins in the knockout strain.

## Abstract

Clostridioides difficile infection (CDI) represents a significant global public health concern. The Phosphatidylinositol Glycan Class L (pig-L) gene in C. difficile encodes an enzyme critical for the biosynthesis of Glycosylphosphatidylinositol (GPI) anchor, which play a vital role in bacterial surface protein localization and function.

To investigate the role of pig-L in C. difficile pathogenesis, we utilized CRISPR-Cas9 gene editing to generate a pig-L knockout strain and a complementation strain in the wild-type (WT) background. Phenotypic characterization of these strains was performed through a suite of assays, including virulence assays, biofilm formation assays, oxidative stress sensitivity testing, and antimicrobial susceptibility testing. Proteomics analysis was conducted to identify differentially expressed proteins in the knockout strain.

Deletion of the pig-L gene resulted in a significant reduction in C. difficile virulence, decreased biofilm formation, and increased susceptibility to oxidative stress. Proteomic analysis revealed significant alterations in protein expression, with 170 proteins exhibiting upregulation and 101 proteins demonstrating downregulation in the knockout strain. Complementation of the pig-L gene partially restored the phenotypes observed in the deletion strain.

These findings demonstrate that the pig-L gene functions as a crucial regulator of C. difficile virulence, biofilm formation, and peroxide resistance. Targeting the pig-L gene or its downstream effectors represents a promising avenue for the development of novel therapeutic strategies to effectively control C. difficile infection.