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Xer Site Specific Recombination: Double and Single Recombinase Systems.
Fabio Castillo1, Amal Benmohamed1, George Szatmari1
1Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal, Montréal QC, Canada.
Frontiers in Microbiology
|April 5, 2017
Summary
Bacterial chromosome segregation relies on Xer recombinases resolving dimers. This review explores the diverse Xer systems across bacteria and archaea, highlighting their roles in genome stability and mobile element integration.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Bacterial chromosome replication can lead to dimers, hindering segregation.
- Site-specific recombination, primarily by XerC and XerD recombinases, resolves these dimers in many bacteria.
- The FtsK protein regulates the timing and location of dimer resolution.
Purpose of the Study:
- To review the diversity of dif/Xer recombinase systems in prokaryotes.
- To summarize the current understanding of Xer recombinase homologs and their functions.
- To highlight the evolutionary versatility of these systems.
Main Methods:
- Comparative genomics analysis of bacterial and archaeal genomes.
- Literature review of studies on dif/Xer recombination systems.
- Functional characterization of Xer recombinases and their associated sites.
Main Results:
- Identified variations in Xer recombinase systems, including single recombinases (XerS, XerH) and alternative dif sites (difSL, difH) in specific bacterial lineages.
- Observed XerA acting on dif sites in Archaea, often independently of FtsK.
- Documented the exploitation of dif/Xer systems by mobile genetic elements for integration.
Conclusions:
- The dif/Xer recombination machinery exhibits significant evolutionary plasticity across prokaryotes.
- These systems are crucial for maintaining genome integrity and are utilized by mobile elements.
- Understanding these diverse systems provides insights into bacterial genome dynamics.