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Hu G, Yin L, Luo X, Miao Y, Yu J. A Duplex PCR Assay for Rapid Detection of Klebsiella pneumoniae and Chryseobacterium in Large Yellow Croaker Fish. Foodborne Pathog Dis 2024. [PMID: 38708669 DOI: 10.1089/fpd.2023.0149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2024] Open
Abstract
Both Klebsiella pneumoniae and Chryseobacterium cause an increasing number of diseases in fish, resulting in great economic losses in aquaculture. In addition, the disease infected with Klebsiella pneumoniae or Chryseobacterium exhibited the similar clinical symptoms in aquatic animals. However, there is no effective means for the simultaneous detection of co-infection and discrimination them for these two pathogens. Here, we developed a duplex polymerase chain reaction (PCR) method based on the outer membrane protein A (ompA) gene of Klebsiella pneumoniae and Chryseobacterium. The specificity and validity of the designed primers were confirmed experimentally using simplex PCR. The expected amplicons for Klebsiella pneumoniae and Chryseobacterium had a size of 663 and 1404 bp, respectively. The optimal condition for duplex PCR were determined to encompass a primer concentration of 0.5 μM and annealing temperature of 57°C. This method was analytical specific with no amplification being observed from the genomic DNA of Escherichia coli, Vibrio harveyi, Pseudomonas plecoglossicida, Aeromonas hydrophila and Acinetobacter johnsonii. The limit of detection was estimated to be 20 fg of genomic DNA for Chryseobacterium and 200 fg for Klebsiella pneumoniae, or 100 colony-forming units (CFU) of bacterial cells in both cases. The duplex PCR was capable of simultaneously amplifying target fragments from genomic DNA extracted from the bacteria and fish liver. For practical validation of the method, 20 diseased fish were collected from farms, among which 4 samples were PCR-positive for Klebsiella pneumoniae and Chryseobacterium. The duplex PCR method developed here is time-saving, specific, convenient, and may prove to be an invaluable tool for molecular detection and epidemiological investigation of Klebsiella pneumoniae and Chryseobacterium in the field of aquaculture.
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Affiliation(s)
- Gaowei Hu
- College of Life Sciences, Taizhou key Laboratory of Biomass Functional Materials Development and Application, Taizhou University, Taizhou, China
| | - Longfei Yin
- College of Life Sciences, Taizhou key Laboratory of Biomass Functional Materials Development and Application, Taizhou University, Taizhou, China
| | - Xi Luo
- College of Life Sciences, Taizhou key Laboratory of Biomass Functional Materials Development and Application, Taizhou University, Taizhou, China
| | - Yingjie Miao
- College of Life Sciences, Taizhou key Laboratory of Biomass Functional Materials Development and Application, Taizhou University, Taizhou, China
| | - Jianyun Yu
- College of Life Sciences, Taizhou key Laboratory of Biomass Functional Materials Development and Application, Taizhou University, Taizhou, China
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2
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Zhang X, Lin Y, Xu X, Wen S, Wang Z, Gu J, He Q, Cai X. HtrA is involved in stress response and adhesion in Glaesserella parasuis serovar 5 strain Nagasaki. Vet Microbiol 2023; 282:109748. [PMID: 37120968 DOI: 10.1016/j.vetmic.2023.109748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 02/28/2023] [Accepted: 04/14/2023] [Indexed: 05/02/2023]
Abstract
Glaesserella parasuis is an important pathogen that causes fibrinous polyserositis, peritonitis and meningitis in pigs, leading to considerable economic losses to the swine industry worldwide. It is well established that the serine protease HtrA is closely associated with bacterial virulence, but the role of HtrA in G. parasuis pathogenesis remains largely unknown. To characterize the function of the htrA gene in G. parasuis, a ΔhtrA mutant was constructed. We found that the ΔhtrA mutant showed significant growth inhibition under heat shock and alkaline stress conditions, indicating HtrA is involved in stress tolerance and survival of G. parasuis. In addition, deletion of htrA gene resulted in decreased adherence to PIEC and PK-15 cells and increased phagocytic resistance to 3D4/2 macrophages, suggesting that htrA is essential for adherence of G. parasuis. Scanning electron microscopy revealed morphological surface changes of the ΔhtrA mutant, and transcription analysis confirmed that a number of adhesion-associated genes are downregulated, which corroborated the aforementioned phenomenon. Furthermore, G. parasuis HtrA induced a potent antibody response in piglets with Glässer's disease. These observations confirmed that the htrA gene is related to the survival and pathogenicity of G. parasuis.
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Affiliation(s)
- Xuan Zhang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan 430070, China
| | - Yan Lin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan 430070, China
| | - Xiaojuan Xu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan 430070, China
| | - Siting Wen
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhichao Wang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan 430070, China
| | - Jiayun Gu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan 430070, China
| | - Qigai He
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan 430070, China
| | - Xuwang Cai
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan 430070, China.
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Dosing Regimen of Aditoprim and Sulfamethoxazole Combination for the Glaesserella parasuis Containing Resistance and Virulence Genes. Pharmaceutics 2022; 14:pharmaceutics14102058. [PMID: 36297496 PMCID: PMC9607282 DOI: 10.3390/pharmaceutics14102058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 09/20/2022] [Accepted: 09/23/2022] [Indexed: 11/23/2022] Open
Abstract
Glaesserella parasuis (G. parasuis) causes Glasser’s disease in pigs and causes high mortality in piglets. The new drug Aditoprim (ADP) alone or combined with Sulfamethoxazole (SMZ) is one of the good choices for treating respiratory infections. The objective of this study was to recommend the optimal dosing regimen for the treatment of G. parasuis infection which contains resistance and virulence genes by ADP/SMZ compound through pharmacokinetics–pharmacodynamics (PK-PD) modeling. The whole genome of the virulent strain G. parasuis H78 was obtained and annotated by whole genome sequencing. The results show that G. parasuis H78 consists of a unilateral circular chromosome with prophages in the genome. The annotation results of G. parasuis H78 showed that the genome contained a large number of virulence-related genes and drug resistance-related genes. The in vitro PD study showed that the antibacterial effect of ADP/SMZ compound against G. parasuis was time-dependent, and AUC/MIC was selected as the PK-PD modeling parameter. The PK study showed that the content of ADP/SMZ compound in pulmonary epithelial lining fluid (PELF) was higher than plasma, and there were no significant differences in ADP and SMZ PK parameters between the healthy and infected group. The dose equation to calculate the optimal dosing regimen of ADP/SMZ compound administration for control of G. parasuis infection was 5/25 mg/kg b.w., intramuscular injection once a day for 3~5 consecutive days. The results of this study provide novel therapeutic options for the treatment of G. parasuis infection to decrease the prevalence and disease burden caused by G. parasuis.
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4
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He C, Yang P, Wang L, Jiang X, Zhang W, Liang X, Yin L, Yin Z, Geng Y, Zhong Z, Song X, Zou Y, Li L, Lv C. Antibacterial effect of Blumea balsamifera DC. essential oil against Haemophilus parasuis. Arch Microbiol 2020; 202:2499-2508. [PMID: 32638056 DOI: 10.1007/s00203-020-01946-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 02/22/2020] [Accepted: 06/06/2020] [Indexed: 11/30/2022]
Abstract
Haemophilus parasuis (H. parasuis), the cause of the Glasser's disease, is a potentially pathogenic gram-negative organism that colonizes the upper respiratory tract of pigs. The extraction of Blumea balsamifera DC., as a traditional Chinese herb, has shown great bacteriostatic effect against several common bacteria. To study the antibacterial effect on H. parasuis in vitro, this study evaluated the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of Blumea balsamifera DC. essential oil (BBO) as well as morphological changes in H. parasuis treated with it. Furthermore, changes in expression of total protein and key virulence factors were also assessed. Results showed that the MIC and MBC were 0.625 and 1.25 μg/mL, respectively. As the concentration of BBO increased, the growth curve inhibition became stronger. H. parasuis cells were damaged severely after treatment with BBO for 4 h, demonstrating plasmolysis and enlarged vacuoles, along with broken cell walls and membranes. Total protein and virulence factor expression in H. parasuis was significantly downregulated by BBO. Taken together, these results indicated a substantial antibacterial effect of BBO on H. parasuis.
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Affiliation(s)
- Changliang He
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China. .,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China.
| | - Peiyi Yang
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Lu Wang
- Engineering Research Center of the Utilization for Characteristic Bio-Pharmaceutical Resources in Southwest, Ministry of Education, Guizhou University, Guiyang, 550025, Guizhou, People's Republic of China
| | - Xiaolin Jiang
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Wei Zhang
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Xiaoxia Liang
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Lizi Yin
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Zhongqiong Yin
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Yi Geng
- Department of Basic Veterinary, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China
| | - Zhijun Zhong
- Sichuan Province Key Laboratory of Animal Disease and Human Health, Key Laboratory of Environmental Hazard and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Xu Song
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Yuanfeng Zou
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Lixia Li
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
| | - Cheng Lv
- Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Huimin Road No. 211, Wenjiang District, Chengdu, Sichuan, People's Republic of China.,Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, People's Republic of China
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5
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Comparative genomic and methylome analysis of non-virulent D74 and virulent Nagasaki Haemophilus parasuis isolates. PLoS One 2018; 13:e0205700. [PMID: 30383795 PMCID: PMC6211672 DOI: 10.1371/journal.pone.0205700] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 09/28/2018] [Indexed: 12/13/2022] Open
Abstract
Haemophilus parasuis is a respiratory pathogen of swine and the etiological agent of Glässer's disease. H. parasuis isolates can exhibit different virulence capabilities ranging from lethal systemic disease to subclinical carriage. To identify genomic differences between phenotypically distinct strains, we obtained the closed whole-genome sequence annotation and genome-wide methylation patterns for the highly virulent Nagasaki strain and for the non-virulent D74 strain. Evaluation of the virulence-associated genes contained within the genomes of D74 and Nagasaki led to the discovery of a large number of toxin-antitoxin (TA) systems within both genomes. Five predicted hemolysins were identified as unique to Nagasaki and seven putative contact-dependent growth inhibition toxin proteins were identified only in strain D74. Assessment of all potential vtaA genes revealed thirteen present in the Nagasaki genome and three in the D74 genome. Subsequent evaluation of the predicted protein structure revealed that none of the D74 VtaA proteins contain a collagen triple helix repeat domain. Additionally, the predicted protein sequence for two D74 VtaA proteins is substantially longer than any predicted Nagasaki VtaA proteins. Fifteen methylation sequence motifs were identified in D74 and fourteen methylation sequence motifs were identified in Nagasaki using SMRT sequencing analysis. Only one of the methylation sequence motifs was observed in both strains indicative of the diversity between D74 and Nagasaki. Subsequent analysis also revealed diversity in the restriction-modification systems harbored by D74 and Nagasaki. The collective information reported in this study will aid in the development of vaccines and intervention strategies to decrease the prevalence and disease burden caused by H. parasuis.
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6
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Kang JG, Lee HW, Ko S, Chae JS. Comparative proteomic analysis of outer membrane protein 43 ( omp43)-deficient Bartonella henselae. J Vet Sci 2018; 19:59-70. [PMID: 28693313 PMCID: PMC5799401 DOI: 10.4142/jvs.2018.19.1.59] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 05/09/2017] [Accepted: 06/08/2017] [Indexed: 12/17/2022] Open
Abstract
Outer membrane proteins (OMPs) of Gram-negative bacteria constitute the first line of defense protecting cells against environmental stresses including chemical, biophysical, and biological attacks. Although the 43-kDa OMP (OMP43) is major porin protein among Bartonella henselae-derived OMPs, its function remains unreported. In this study, OMP43-deficient mutant B. henselae (Δomp43) was generated to investigate OMP43 function. Interestingly, Δomp43 exhibited weaker proliferative ability than that of wild-type (WT) B. henselae. To study the differences in proteomic expression between WT and Δomp43, two-dimensional gel electrophoresis-based proteomic analysis was performed. Based on Clusters of Orthologus Groups functional assignments, 12 proteins were associated with metabolism, 7 proteins associated with information storage and processing, and 3 proteins associated with cellular processing and signaling. By semi-quantitative reverse transcriptase polymerase chain reaction, increases in tldD, efp, ntrX, pdhA, purB, and ATPA mRNA expression and decreases in Rho and yfeA mRNA expression were confirmed in Δomp43. In conclusion, this is the first report showing that a loss of OMP43 expression in B. henselae leads to retarded proliferation. Furthermore, our proteomic data provide useful information for the further investigation of mechanisms related to the growth of B. henselae.
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Affiliation(s)
- Jun-Gu Kang
- Laboratory of Veterinary Internal Medicine, Research Institute and BK21 Program for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea
| | - Hee-Woo Lee
- Laboratory of Veterinary Internal Medicine, Research Institute and BK21 Program for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea
| | - Sungjin Ko
- Laboratory of Veterinary Internal Medicine, Research Institute and BK21 Program for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea
| | - Joon-Seok Chae
- Laboratory of Veterinary Internal Medicine, Research Institute and BK21 Program for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea
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7
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Haemophilus parasuis modulates cellular invasion via TGF-β1 signaling. Vet Microbiol 2016; 196:18-22. [DOI: 10.1016/j.vetmic.2016.10.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 08/06/2016] [Accepted: 10/09/2016] [Indexed: 01/18/2023]
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8
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HtrA Is Important for Stress Resistance and Virulence in Haemophilus parasuis. Infect Immun 2016; 84:2209-2219. [PMID: 27217419 PMCID: PMC4962635 DOI: 10.1128/iai.00147-16] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 05/12/2016] [Indexed: 02/06/2023] Open
Abstract
Haemophilus parasuis is an opportunistic pathogen that causes Glässer's disease in swine, with polyserositis, meningitis, and arthritis. The high-temperature requirement A (HtrA)-like protease, which is involved in protein quality control, has been reported to be a virulence factor in many pathogens. In this study, we showed that HtrA of H. parasuis (HpHtrA) exhibited both chaperone and protease activities. Finally, nickel import ATP-binding protein (NikE), periplasmic dipeptide transport protein (DppA), and outer membrane protein A (OmpA) were identified as proteolytic substrates for HpHtrA. The protease activity reached its maximum at 40°C in a time-dependent manner. Disruption of the htrA gene from strain SC1401 affected tolerance to temperature stress and resistance to complement-mediated killing. Furthermore, increased autoagglutination and biofilm formation were detected in the htrA mutant. In addition, the htrA mutant was significantly attenuated in virulence in the murine model of infection. Together, these data demonstrate that HpHtrA plays an important role in the virulence of H. parasuis.
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Zhang L, Li Y, Dai K, Wen X, Wu R, Huang X, Jin J, Xu K, Yan Q, Huang Y, Ma X, Wen Y, Cao S. Establishment of a Successive Markerless Mutation System in Haemophilus parasuis through Natural Transformation. PLoS One 2015; 10:e0127393. [PMID: 25985077 PMCID: PMC4436007 DOI: 10.1371/journal.pone.0127393] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 04/15/2015] [Indexed: 11/18/2022] Open
Abstract
Haemophilus parasuis, belonging to the family Pasteurellaceae, is the causative agent of Glässer's disease leading to serious economic losses. In this study, a successive markerless mutation system for H. parasuis using two sequential steps of natural transformation was developed. By the first homologous recombination, the target genes were replaced by a cassette carrying kanamycin resistance gene and sacB (which confers sensitivity to sucrose) gene using kanamycin selection, followed by the second reconstruction to remove the selection cassette, with application of sucrose to further screen unmarked mutants. To improve DNA transformation frequency, several parameters have been analyzed further in this work. With this method, two unmarked deletions in one strain have been generated successfully. It is demonstrated that this system can be employed to construct multi-gene scarless deletions, which is of great help for developing live attenuated vaccines for H. parasuis.
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Affiliation(s)
- Luhua Zhang
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Ying Li
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Ke Dai
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Xintian Wen
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Rui Wu
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Xiaobo Huang
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Jin Jin
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Kui Xu
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Qigui Yan
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Yong Huang
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Xiaoping Ma
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Yiping Wen
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
- * E-mail: (YW); (SC)
| | - Sanjie Cao
- Porcine Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
- * E-mail: (YW); (SC)
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Identification of putative virulence-associated genes among Haemophilus parasuis strains and the virulence difference of different serovars. Microb Pathog 2014; 77:17-23. [PMID: 25283960 DOI: 10.1016/j.micpath.2014.10.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Revised: 09/29/2014] [Accepted: 10/01/2014] [Indexed: 11/24/2022]
Abstract
This study was aimed at determining virulence-associated genes among Haemophilus parasuis (H. parasuis) strains, and supplying for the Kielstein-Rapp-Gabrielson serotyping scheme. The subtractive fragments, obtained through suppression subtractive hybridization and reverse Southern blot hybridization, were found to encode genes representative of 7 different functions. PCR was used to investigate the distribution of these fragments in H. parasuis strains isolated from different infection sites in pigs. Mice challenge was then used to analyze the correlationship between subtractive fragments, infection sites and bacterial virulence. Eight weeks old female BALB/c mice (10 mice/group) were inoculated intraperitoneally with 3.0 × 10(9) CFU suspension (0.5 ml/mouse) of H. parasuis strains in PBS. Results indicated that H. parasuis possessed varied virulence even among the same serovar strains. Transcription units hsdR, hsdS, gpT and ompP2, identified from the subtractive fragments, were uniformly expressed in highly virulent strains, while absent in weakly virulent strains, and demonstrated variable degrees of expression in moderately virulent strains. Moreover, H. parasuis strains, isolated from pericardium and heart blood, were all highly virulent strains, while from nasal cavity and joint were moderately or weakly virulent strains. This study indicated that fragments hsdR, hsdS, gpT and ompP2 were associated with the virulence of H. parasuis. The virulence of H. parasuis strains isolated from different infection sites was different. The current research provides a new reference for determining bacterial virulence in different H. parasuis strains.
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Feng S, Xu L, Xu C, Fan H, Liao M, Ren T. Role of acrAB in antibiotic resistance of Haemophilus parasuis serovar 4. Vet J 2014; 202:191-4. [DOI: 10.1016/j.tvjl.2014.05.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 05/28/2014] [Accepted: 05/30/2014] [Indexed: 10/25/2022]
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12
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Costa-Hurtado M, Aragon V. Advances in the quest for virulence factors of Haemophilus parasuis. Vet J 2013; 198:571-6. [DOI: 10.1016/j.tvjl.2013.08.027] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 08/20/2013] [Accepted: 08/25/2013] [Indexed: 10/26/2022]
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13
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Confer AW, Ayalew S. The OmpA family of proteins: Roles in bacterial pathogenesis and immunity. Vet Microbiol 2013; 163:207-22. [DOI: 10.1016/j.vetmic.2012.08.019] [Citation(s) in RCA: 158] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Accepted: 08/23/2012] [Indexed: 10/27/2022]
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14
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Zhang B, Xu C, Zhang L, Zhou S, Feng S, He Y, Liao M. Enhanced adherence to and invasion of PUVEC and PK-15 cells due to the overexpression of RfaD, ThyA and Mip in the ΔompP2 mutant of Haemophilus parasuis SC096 strain. Vet Microbiol 2013; 162:713-723. [DOI: 10.1016/j.vetmic.2012.09.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 09/17/2012] [Accepted: 09/19/2012] [Indexed: 11/28/2022]
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15
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Lima TB, Pinto MFS, Ribeiro SM, de Lima LA, Viana JC, Gomes Júnior N, Cândido EDS, Dias SC, Franco OL. Bacterial resistance mechanism: what proteomics can elucidate. FASEB J 2013; 27:1291-303. [PMID: 23349550 DOI: 10.1096/fj.12-221127] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Antibiotics are important therapeutic agents commonly used for the control of bacterial infectious diseases; however, resistance to antibiotics has become a global public health problem. Therefore, effective therapy in the treatment of resistant bacteria is necessary and, to achieve this, a detailed understanding of mechanisms that underlie drug resistance must be sought. To fill the multiple gaps that remain in understanding bacterial resistance, proteomic tools have been used to study bacterial physiology in response to antibiotic stress. In general, the global analysis of changes in the protein composition of bacterial cells in response to treatment with antibiotic agents has made it possible to construct a database of proteins involved in the process of resistance to drugs with similar mechanisms of action. In the past few years, progress in using proteomic tools has provided the most realistic picture of the infective process, since these tools detect the end products of gene biosynthetic pathways, which may eventually determine a biological phenotype. In most bacterial species, alterations occur in energy and nitrogen metabolism regulation; glucan biosynthesis is up-regulated; amino acid, protein, and nucleotide synthesis is affected; and various proteins show a stress response after exposing these microorganisms to antibiotics. These issues have been useful in identifying targets for the development of novel antibiotics and also in understanding, at the molecular level, how bacteria resist antibiotics.
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Affiliation(s)
- Thais Bergamin Lima
- Centro de Análises Proteômicas e Bioquímicas, Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasilia, Brazil
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Fu S, Zhang M, Ou J, Liu H, Tan C, Liu J, Chen H, Bei W. Construction and immune effect of Haemophilus parasuis DNA vaccine encoding glyceraldehyde-3-phosphate dehydrogenase (GAPDH) in mice. Vaccine 2012; 30:6839-44. [PMID: 23000128 DOI: 10.1016/j.vaccine.2012.09.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 08/27/2012] [Accepted: 09/07/2012] [Indexed: 11/28/2022]
Abstract
Haemophilus parasuis, the causative agent of swine polyserositis, polyarthritis, and meningitis, is one of the most important bacterial diseases of pigs worldwide. The development of a vaccine against H. parasuis has been impeded due to the lack of induction of reliable cross-serotype protection. In this study the gapA gene that encodes glyceraldehyde-3-phosphate dehydrogenase (GAPDH) was shown to be present and highly conserved in various serotypes of H. parasuis and we constructed a novel DNA vaccine encoding GAPDH (pCgap) to evaluate the immune response and protective efficacy against infection with H. parasuis MD0322 serovar 4 or SH0165 serovar 5 in mice. A significant antibody response against GAPDH was generated following pCgap intramuscular immunization; moreover, antibodies to the pCgap DNA vaccine were bactericidal, suggesting that it was expressed in vivo. The gapA transcript was detected in muscle, liver, spleen, and kidney of the mice seven days post-vaccination. The IgG subclass (IgG1 and IgG2a) analysis indicated that the DNA vaccine induced both Th1 and Th2 immune responses, but the IgG1 response was greater than the IgG2a response. Moreover, the groups vaccinated with the pCgap vaccine exhibited 83.3% and 50% protective efficacy against the H. parasuis MD0322 serovar 4 or SH0165 serovar 5 challenges, respectively. The pCgap DNA vaccine provided significantly greater protective efficacy compared to the negative control groups or blank control groups (P<0.05 for both). Taken together, these findings indicate that the pCgap DNA vaccine provides a novel strategy against infection of H. parasuis and offer insight concerning the underlying immune mechanisms of a bacterial DNA vaccine.
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Affiliation(s)
- Shulin Fu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
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