School of Biotechnology, Amrita Vishwa Vidyapeetham, Amritapuri, Kerala, India.
Tata Institute for Genetics and Society-India (TIGS), TIGS Center at inStem, Bangalore, Karnataka, India.
mSphere. 2021 Jan 13;6(1):e01215-20. doi: 10.1128/mSphere.01215-20.
Multidrug-resistant community-acquired infections caused by the opportunistic human pathogen are increasingly reported in India and other locations globally. Since this organism is ubiquitous in the environment, samples such as sewage and wastewater are rich reservoirs of bacteriophages. In this study, we report the isolation and characterization of a novel N4-like lytic bacteriophage, vB_Pae_AM.P2 (AM.P2), from wastewater in Kerala, India. AM.P2 is a double-stranded DNA podovirus that efficiently lyses the model strain, PAO1, at a multiplicity of infection as low as 0.1 phage per bacterium and resistance frequency of 6.59 × 10 Synergy in bactericidal activity was observed between AM.P2 and subinhibitory concentrations of the antibiotic ciprofloxacin. Genome sequencing of AM.P2 revealed features similar to those of the N4-like phages LUZ7 and KPP21. As judged by two independent assay methods, spot tests and growth inhibition, AM.P2 successfully inhibited the growth of almost 30% of strains from a contemporary collection of multidrug-resistant clinical isolates from South India. Thus, AM.P2 may represent an intriguing candidate for inclusion in bacteriophage cocktails developed for various applications, including water decontamination and clinical bacteriophage therapy. In India, multidrug resistance determinants are much more abundant in community-associated bacterial pathogens due to the improper treatment of domestic and industrial effluents. In particular, a high bacterial load of the opportunistic pathogen in sewage and water bodies in India is well documented. The isolation and characterization of bacteriophages that could target emerging strains, representing possible epicenters for community-acquired infections, could serve as a useful alternative tool for various applications, such as phage therapy and environmental treatment. Continuing to supplement the repertoire of broad-spectrum bacteriophages is an essential tool in confronting this problem.
在印度和其他全球各地,越来越多的报告显示,机会性人类病原体引起的多药耐药性社区获得性感染。由于这种生物在环境中无处不在,因此污水和废水等样本是噬菌体的丰富储库。在这项研究中,我们报告了一种新型 N4 样裂解噬菌体 vB_Pae_AM.P2(AM.P2)的分离和特性,该噬菌体来自印度喀拉拉邦的废水。AM.P2 是一种双链 DNA 短尾噬菌体,在感染复数低至 0.1 噬菌体/细菌时可有效裂解模型菌株 PAO1,其杀菌活性的耐药频率为 6.59×10。在 AM.P2 和亚抑菌浓度的抗生素环丙沙星之间观察到协同作用。AM.P2 的基因组测序显示出与 N4 样噬菌体 LUZ7 和 KPP21 相似的特征。根据两种独立的检测方法,点测试和生长抑制试验,AM.P2 成功抑制了来自印度南部当代多药耐药临床分离株的近 30%菌株的生长。因此,AM.P2 可能是一个有趣的候选者,可用于开发用于各种应用的噬菌体鸡尾酒,包括水净化和临床噬菌体治疗。在印度,由于对家庭和工业废水的不当处理,社区相关细菌病原体中的多药耐药决定因素要丰富得多。特别是,印度污水和水体中机会性病原体的细菌负荷很高,这一点有充分的记录。分离和表征能够靶向新兴菌株的噬菌体,这些菌株可能是社区获得性感染的可能中心,可以作为各种应用(如噬菌体治疗和环境处理)的有用替代工具。不断补充广谱噬菌体的库是应对这一问题的重要工具。