RAP44 phage integrase-guided 50K genomic island integration in Riemerella anatipestifer.

RAP44 phage integrase-guided 50K genomic island integration in Riemerella anatipestifer.
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DOI:
10.3389/fvets.2022.961354
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发表时间:
2022
影响因子:
3.2
通讯作者:
--
中科院分区:
农林科学2区
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--
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噬菌体是感染细菌的病毒。细菌和噬菌体一直在为生存而战。随着时间的推移,这两个种群的进化都受到了影响。致病性黄杆菌科包括鸭疫里默氏菌,主要感染雏鸭、鹅和火鸡。然而,它不会感染人类、大鼠或其他哺乳动物,是实验室中合适和安全的研究对象。我们之前的研究表明鸭疫鼠存在一个10K的基因组岛,本研究我们发现了另一个完整的50K基因组岛,并重点研究了鸭疫鼠基因组岛与RAP44噬菌体基因组的关系。RAP44噬菌体基因组被整合到鸭疫鼠染色体中,在我们的比较分析中,两者之间存在明显的进化关系。整合的RAP44缺陷噬菌体序列具有自动整合、自动切除和自动环化的功能。集成是重要的集成元素。在鸭疫鼠中验证了整合酶的整合功能。带attP位点的整合酶可以稳定地整合到鸭疫鼠基因组的attB位点。重组菌株能够稳定地继承和表达外源基因。通过研究宿主细菌与噬菌体之间的整合,我们为鸭疫鼠基因组的进化提供了证据。
Bacteriophages are viruses that infect bacteria. Bacteria and bacteriophages have been fighting for survival. Over time, the evolution of both populations has been affected. Pathogenic Flavobacteriaceae species including Riemerella anatipestifer mainly infects ducklings, geese, and turkeys. However, it does not infect humans, rats, or other mammals, and is a suitable and safe research object in the laboratory. Our previous study showed that there is a 10K genomic island in R. anatipestiferIn this study, we found another integrated 50K genomic islands and focused on the relationship between R. anatipestifer genomic islands and the RAP44 phage genome. The phage RAP44 genome was integrated into R. anatipestifer chromosome, and an evolutionary relationship was evident between them in our comparative analysis. Furthermore, the integrated defective RAP44 phage sequence had the function of integration, excision, and cyclization automatically. Integrases are important integration elements. The integrative function of integrase was verified in R. anatipestifer. The integrase with the attP site can be integrated stably at the attB locus of the R. anatipestifer genome. A recombinant strain can stably inherit and express the exogenous gene. By studying the integration between host bacterium and phage, we have provided evidence for the evolution of the genomes in R. anatipestifer.
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