Journal of Tropical Oceanography ›› 2022, Vol. 41 ›› Issue (1): 28-41.doi: 10.11978/2021025CSTR: 32234.14.2021025

• Marine Biology • Previous Articles     Next Articles

Comparative genomic analysis of the distribution and evolution of quorum sensing pathways in the Vibrio genus

MAO Yingjin1,2(), GAO Beile1()   

  1. 1. CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301
    2. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2021-02-24 Revised:2021-04-15 Online:2022-01-10 Published:2021-04-22
  • Contact: GAO Beile E-mail:maoyingjin18@mails.ucas.edu.cn;gaob@scsio.ac.cn
  • Supported by:
    Science and Technology Program of Guangzhou, China(201804010437)

Abstract:

Quorum sensing (QS) is a process of bacterial cell-cell communication in which bacteria can monitor their population density by detection of extracellular autoinducer. QS allows the bacteria to switch between two kinds of gene expression modes: The program is suitable for individual development at low cell density, while favoring community at high cell density. Presently, there are mainly seven kinds of QS signaling molecules, including oligopeptides, AHL (Acylated Homoserine Lactones), AI-2 (Autoinducer-2), CAI-1 (Cholera Autoinducer-1), PQS (Pseudomonas Quinolone Signal), AI-3 (Autoinducer-3), and DSF (Diffusible Signal Factor). Among them, oligopeptides mainly exist in gram-positive bacteria, and the others are commonly found in gram-negative bacteria. Species of the Vibrio genus are important pathogens for human and aquaculture. Since traditional antibiotic treatment has a strong selection pressure leading to increasing number of drug-resistant Vibrio and increasing serious problems, QS quenching is believed as one alternative strategy of the most potential to combat bacterial infection. Thus, it is necessary to investigate the distribution of QS pathways among the Vibrio genus. Among the 46 whole genome sequenced Vibrio species, we found that only three pathways exist in Vibrio species, including AHL, AI-2 and CAI-1 pathways. Specifically, five Vibrio species contain the above three pathways, and 30 strains contain both AI-2 and CAI-1 pathways. However, none of the 46 Vibrio species have the PQS, AI-3 and DSF pathways. In addition, the distribution of QS pathways in Vibrio is related to their phylogeny, suggesting that species with the same QS pathway(s) are close relatives, which indicates that the genes of this pathway evolved from their common ancestor. This study provides useful information for QS quenching against Vibrio pathogens by targeting the AI-2 and CAI-1 QS pathways.

Key words: comparative genomics, vibrio genera, quorum sensing, signaling molecules, species evolution, quorum quenching

CLC Number: 

  • P735.51