Biotechnology Bulletin ›› 2025, Vol. 41 ›› Issue (1): 39-48.doi: 10.13560/j.cnki.biotech.bull.1985.2024-0457

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Mechanisms and Application Research Progress of Bacterial Genomic Homologous Recombination Mediated by Single-stranded DNA Annealing Protein

YIN Hao1,2(), YOU Liu-chao1,2, HAN Rui1,2, GAO Peng-cheng1,2, FU Lei1,2(), CHU Yue-feng1,2()   

  1. 1. State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730000
    2. Gansu Province Research Center for Basic Disciplines of Pathogen Biology, Lanzhou 730046
  • Received:2024-05-16 Online:2025-01-26 Published:2025-01-22
  • Contact: FU Lei, CHU Yue-feng E-mail:qubaobaozz@163.com;fulei@caas.cn;chuyuefeng@caas.cn

Abstract:

Genome editing technology is an important tool for studying the gene function, drug resistance mechanism, and pathogenic mechanism of bacteria and other microorganisms. Homologous recombination is one of the key methods for bacterial genome editing. The conventional endogenous pathways in bacteria suffer from low efficiency. However, a single-stranded DNA annealing protein(SSAP)from bacteriophages, which has shown gene editing efficiencies far surpassing those of endogenous pathways. This protein has the characteristics of single-stranded DNA binding activity and mediates genome directed recombination, making it an extremely promising tool for genome editing. This article provides an overview of the basic principles of homologous recombination, the fundamental components of the SSAP-mediated homologous recombination pathway from phages, recombination mechanism models, and application strategies. The aim is to assist in further elucidating the process of homologous recombination mediated by SSAP to provide technical support for studying the functions and pathogenic mechanisms of more bacterial genes, and to develop engineering strains. It also provides technical support for bacteria lacking gene editing methods.

Key words: bacteria, single-stranded DNA annealing protein, homologous recombination, mechanism, application