In the realm of biotechnology, the efficiency of chromosomal integration of genes is a critical factor in various applications. One study by Yu et al. highlighted the importance of donor plasmid concentration in improving integration efficiency. By introducing a narrow-host replicon, R6K, the concentration of integrative plasmid was significantly increased, leading to higher integration efficiency. Furthermore, the use of FLP recombinase in the integration process was explored, showcasing the intricate steps involved in DNA binding, synapsis, recombination, and dissociation. The study emphasized the impact of integrative plasmid concentration on the successful integration of genes into recipient cells. Additionally, increasing the number of FRT sites on the chromosome was found to enhance integration efficiency and average copy number, similar to the effects observed with the attB/attP site catalyzed by ΦC31 integrase. Through a detailed analysis of 150 CIGMC strains, the integrated copy number of pG-2 was assessed, shedding light on the distribution and variability within the strains. This research paves the way for a more comprehensive understanding of gene integration mechanisms and strategies for optimizing efficiency.
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