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Published on: May 31, 2024
A mobile quorum-sensing system in Serratia marcescens
Jun-Rong Wei1, Yu-Huan Tsai, Yu-Tze Horng
1Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University College of Medicine, No.1. Chang-Der Street, Taipei 100, Taiwan, Republic of China.
A novel quorum-sensing system, spnIR, found in Serratia marcescens, is carried on a mobile transposon (TnTIR). This system regulates its own transposition, offering insights into bacterial gene transfer and multicellular behavior.
Area of Science:
- Microbiology and Molecular Biology
- Bacterial Genetics and Evolution
Background:
- Quorum-sensing systems regulate bacterial multicellular behavior and virulence by sensing population density.
- The luxIR quorum-sensing genes exhibit a diverse and discontinuous distribution across proteobacteria.
Purpose of the Study:
- To investigate the characteristics and mobility of the spnIR quorum-sensing system in Serratia marcescens SS-1.
- To understand the role of spnIR in regulating its own genetic element's transposition.
Main Methods:
- Identification and characterization of the spnIR quorum-sensing system within the enterobacterium Serratia marcescens SS-1.
- Analysis of the genetic element carrying spnIR, identified as a transposon (TnTIR) with Tn3 family characteristics.
- Assessment of TnTIR's mobility between enterobacterial chromosomes and plasmids and spnIR's regulatory function in new hosts.
Main Results:
- The spnIR quorum-sensing system is located on a mobile transposon, TnTIR, which is transferable between enterobacterial hosts.
- TnTIR exhibits characteristics common to Tn3 family transposons.
- The spnIR system, functional in new hosts, demonstrates negative regulation of TnTIR transposition frequency.
Conclusions:
- The discovery of the mobile spnIR system on TnTIR provides a mechanism for horizontal gene transfer of quorum-sensing elements.
- This finding sheds light on the evolutionary dynamics of bacterial multicellular behavior regulation.
- The self-regulatory function of spnIR on transposition may influence the spread and persistence of quorum-sensing genes.
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