CRISPR-Cas System and its Role in Quorum-Sensing Processes of Bacteria and Fungi

CRISPR-Cas system (CCS) provides gene-editing tools that have revolutionized the field of molecular biology. It is a system adapted from the prokaryote immune response against invading viruses, and it has been adapted for use in many organisms, including humans. Recently, researchers have been exploring the potential of this system in modifying quorum- sensing (QS) systems in bacteria and fungi. QS is a communication system used by microbes to coordinate their behavior and respond to changes in their environment. It involves the production and detection of small signaling molecules called autoinducers, which accumulate as the bacterial population grows. When a threshold concentration of autoinducers is reached, the bacteria respond by altering their gene expression and behavior. Quorum sensing is thus reported to play a crucial role in bacterial pathogenesis, biofilm formation, and antibiotic resistance. CCS is useful to modify quorum-sensing systems by either targeting or cleaving the genes involved in autoinducer synthesis, detection, and response. It can also be useful as a regulatory mechanism for the quorum sensing and microbial virulence. Thus, the system can disrupt the communication between microbes and prevent the formation of harmful biofilms or the expression of virulence factors. This could be used to create synthetic quorum- sensing systems that allow researchers to control microbial interaction behavior in new ways. The chapter discusses if CCS has the potential to be targeted as a key factor in quorum sensing or antibiotic resistance and highlights its role as a powerful tool for manipulating quorum-sensing systems in fungi and bacteria.