1
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Touge C, Nakatsu M, Sugimoto M, Takamura E, Sakamoto H. A Biochemical Corrosion Monitoring Sensor with a Silver/Carbon Comb Structure for the Detection of Living Escherichia coli. ACS OMEGA 2023; 8:43511-43520. [PMID: 38027348 PMCID: PMC10666268 DOI: 10.1021/acsomega.3c03632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 10/20/2023] [Accepted: 10/25/2023] [Indexed: 12/01/2023]
Abstract
For the detection and monitoring of live bacteria, we propose a biochemical corrosion monitoring (BCM) sensor that measures galvanic current by using a Ag/C sensor comprising silver and carbon comb electrodes. The deposition of an Escherichia coli suspension containing an LB liquid medium on the Ag/C sensor increased the galvanic current. The time required for the current to reach 20 nA is defined as T20. T20 tends to decrease as the initial number of E. coli in the E. coli solution increases. A linear relationship was obtained between the logarithm of the E. coli count and T20 in a bacterial count range of 1-108 cfu/mL under culture conditions in which the growth rate of the bacteria was constant. Hence, the number of live E. coli could be determined from T20. Ag2S precipitation was observed on the surface of the Ag electrode of the Ag/C sensor, where an increase in the current was observed. This generation of galvanic current was attributed to the reaction between a small amount of free H2S metabolized by E. coli in the bacterial solution during its growth process and Ag-the sensor anode. The Ag/C sensor can detect a free H2S concentration of 0.041 μM in the E. coli solution. This novel biochemical sensor can monitor the growth behavior of living organisms without damaging them.
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Affiliation(s)
- Chiyako Touge
- Industrial
Technology Center of Fukui Prefecture, 10-61, Kawaiwashizuka,Fukui 910-0102, Japan
| | - Michiyo Nakatsu
- Industrial
Technology Center of Fukui Prefecture, 10-61, Kawaiwashizuka,Fukui 910-0102, Japan
| | - Mai Sugimoto
- Department
of Frontier Fiber and Technology and Science, Graduate School of Engineering, University of Fukui, Bunkyo 3-9-1,Fukui 910-8507, Japan
| | - Eiichiro Takamura
- Department
of Frontier Fiber and Technology and Science, Graduate School of Engineering, University of Fukui, Bunkyo 3-9-1,Fukui 910-8507, Japan
| | - Hiroaki Sakamoto
- Department
of Frontier Fiber and Technology and Science, Graduate School of Engineering, University of Fukui, Bunkyo 3-9-1,Fukui 910-8507, Japan
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2
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Shelby T, Sulthana S, McAfee J, Banerjee T, Santra S. Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7. J Vis Exp 2017. [PMID: 28994755 DOI: 10.3791/55821] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Enterohemorrhagic Escherichia coli O157:H7 has been linked to both waterborne and foodborne illnesses, and remains a threat despite the food- and water-screening methods used currently. While conventional bacterial detection methods, such as polymerase chain reaction (PCR) and enzyme-linked immunosorbent assays (ELISA) can specifically detect pathogenic contaminants, they require extensive sample preparation and lengthy waiting periods. In addition, these practices demand sophisticated laboratory instruments and settings, and must be executed by trained professionals. Herein, a protocol is proposed for a simpler diagnostic technique that features the unique combination of magnetic and fluorescent parameters in a nanoparticle-based platform. The proposed multiparametric magneto-fluorescent nanosensors (MFnS) can detect E. coli O157:H7 contamination with as little as 1 colony-forming unit present in solution within less than 1 h. Furthermore, the ability of MFnS to remain highly functional in complex media such as milk and lake water has been verified. Additional specificity assays were also used to demonstrate the ability of MFnS to only detect the specific target bacteria, even in the presence of similar bacterial species. The pairing of magnetic and fluorescent modalities allows for the detection and quantification of pathogen contamination in a wide range of concentrations, exhibiting its high performance in both early- and late-stage contamination detection. The effectiveness, affordability, and portability of the MFnS make them an ideal candidate for point-of-care screening for bacterial contaminants in a wide range of settings, from aquatic reservoirs to commercially packaged foods.
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Affiliation(s)
- Tyler Shelby
- Department of Chemistry and Kansas Polymer Research Center, Pittsburg State University
| | - Shoukath Sulthana
- Department of Chemistry and Kansas Polymer Research Center, Pittsburg State University
| | - James McAfee
- Department of Chemistry and Kansas Polymer Research Center, Pittsburg State University
| | - Tuhina Banerjee
- Department of Chemistry and Kansas Polymer Research Center, Pittsburg State University;
| | - Santimukul Santra
- Department of Chemistry and Kansas Polymer Research Center, Pittsburg State University;
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3
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A gyrB oligonucleotide microarray for the specific detection of pathogenic Legionella and three Legionella pneumophila subsp. Antonie van Leeuwenhoek 2017; 110:1515-1525. [PMID: 28695408 DOI: 10.1007/s10482-017-0903-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 06/26/2017] [Indexed: 10/19/2022]
Abstract
Among the 50 species and 70 serogroups of Legionella identified, Legionella pneumophila, comprising three subsp. (subsp. pneumophila, subsp. fraseri, and subsp. pasculleii), is recognized as the major cause of epidemic legionellosis. Rapid and reliable assays to identify pathogenic Legionella spp., and the three L. pneumophila subsp. in particular, are in great demand. In this study, we analyzed the gyrB genes of eleven Legionella spp. and subsp., comprising L. anisa, L. bozemanii, L. dumoffii, L. feeleii, L. gormanii, L. longbeachae, L. micdadei, L. waltersii, L. pneumophila subsp. pneumophila, L. pneumophila subsp. fraseri, and L. pneumophila subsp. pasculleii. We developed a rapid oligonucleotide microarray detection technique to identify accurately these common pathogenic Legionella spp. and L. pneumophila subsp. To detect multiple Legionella species with high specificity, 31 reproducible probes were designed in the array. Sixty-one strains were analyzed in total, including 37 target pathogens and 24 non-target bacterial species used to validate the microarray. The sensitivity of the detection was 1.0 ng using genomic DNA of three Legionella spp., L. anisa, L. dumoffii, and L. waltersii, or 13 CFU/100 mL using the cultured L. pneumophila subsp. pneumophila. Eight isolated strains were tested using the microarray with 100% accuracy. The data indicated that the technique is an efficient method to diagnose and detect Legionella spp. and subsp. in basic microbiology, clinical diagnosis, epidemiological surveillance, and food safety applications. In addition, a phylogenetic study based on the gyrB gene revealed the genetic relationship among the different Legionella spp. and subsp.
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4
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Using Nucleic Acid Amplification Techniques in a Syndrome-Oriented Approach: Detection of Respiratory Agents. Mol Microbiol 2016. [DOI: 10.1128/9781555819071.ch25] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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5
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Wu TY, Su YY, Shu WH, Mercado AT, Wang SK, Hsu LY, Tsai YF, Chen CY. A novel sensitive pathogen detection system based on Microbead Quantum Dot System. Biosens Bioelectron 2015; 78:37-44. [PMID: 26590701 DOI: 10.1016/j.bios.2015.11.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 11/04/2015] [Accepted: 11/06/2015] [Indexed: 10/22/2022]
Abstract
A fast and accurate detection system for pathogens can provide immediate measurements for the identification of infectious agents. Therefore, the Microbead Quantum-dots Detection System (MQDS) was developed to identify and measure target DNAs of pathogenic microorganisms and eliminated the need of PCR amplifications. This nanomaterial-based technique can detect different microorganisms by flow cytometry measurements. In MQDS, pathogen specific DNA probes were designed to form a hairpin structure and conjugated on microbeads. In the presence of the complementary target DNA sequence, the probes will compete for binding with the reporter probes but will not interfere with the binding between the probe and internal control DNA. To monitor the binding process by flow cytometry, both the reporter probes and internal control probes were conjugated with Quantum dots that fluoresce at different emission wavelengths using the click reaction. When MQDS was used to detect the pathogens in environmental samples, a high correlation coefficient (R=0.994) for Legionella spp., with a detection limit of 0.1 ng of the extracted DNAs and 10 CFU/test, can be achieved. Thus, this newly developed technique can also be applied to detect other pathogens, particularly viruses and other genetic diseases.
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Affiliation(s)
- Tzong-Yuan Wu
- Department of Bioscience Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan; Center for Nanotechnology and Center for Biomedical Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan; R&D Center of Membrane Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan
| | - Yi-Yu Su
- Department of Bioscience Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan
| | - Wei-Hsien Shu
- Department of Bioscience Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan
| | - Augustus T Mercado
- Department of Bioscience Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan; Department of Chemistry, Chung Yuan Christian University, Chung-Li 320, Taiwan
| | - Shi-Kwun Wang
- Environmental Analysis Laboratory, Environmental Protection Administration, Chung-Li 320, Taiwan
| | - Ling-Yi Hsu
- Environmental Analysis Laboratory, Environmental Protection Administration, Chung-Li 320, Taiwan
| | - Yow-Fu Tsai
- Department of Chemistry, Chung Yuan Christian University, Chung-Li 320, Taiwan
| | - Chung-Yung Chen
- Department of Bioscience Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan; Center for Nanotechnology and Center for Biomedical Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan.
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6
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Janczarek M, Palusińska-Szysz M. PCR method for the rapid detection and discrimination of Legionella spp. based on the amplification of pcs, pmtA, and 16S rRNA genes. J Appl Genet 2015; 57:251-61. [PMID: 26423783 DOI: 10.1007/s13353-015-0317-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 08/18/2015] [Accepted: 09/14/2015] [Indexed: 10/23/2022]
Abstract
Legionella bacteria are organisms of public health interest due to their ability to cause pneumonia (Legionnaires' disease) in susceptible humans and their ubiquitous presence in water supply systems. Rapid diagnosis of Legionnaires' disease allows the use of therapy specific for the disease. L. pneumophila serogroup 1 is the most common cause of infection acquired in community and hospital environments. The non-L. pneumophila infections are likely under-detected because of a lack of effective diagnosis. In this work, simplex and duplex PCR assays with the use of new molecular markers pcs and pmtA involved in phosphatidylcholine synthesis were specified for rapid and cost-efficient identification and distinguishing Legionella species. The sets of primers developed were found to be sensitive and specific for reliable detection of Legionella belonging to the eight most clinically relevant species. Among these, four primer sets I, II, VI, and VII used for duplex-PCRs proved to have the highest identification power and reliability in the detection of the bacteria. Application of this PCR-based method should improve detection of Legionella spp. in both clinical and environmental settings and facilitate molecular typing of these organisms.
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Affiliation(s)
- Monika Janczarek
- Department of Genetics and Microbiology, Institute of Microbiology and Biotechnology, Maria Curie-Sklodowska University, Akademicka St. 19, 20-033, Lublin, Poland
| | - Marta Palusińska-Szysz
- Department of Genetics and Microbiology, Institute of Microbiology and Biotechnology, Maria Curie-Sklodowska University, Akademicka St. 19, 20-033, Lublin, Poland.
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7
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Cao B, Tian Z, Wang S, Zhu Z, Sun Y, Feng L, Wang L. Structural comparison of O-antigen gene clusters of Legionella pneumophila and its application of a serogroup-specific multiplex PCR assay. Antonie van Leeuwenhoek 2015; 108:1405-1423. [PMID: 26415652 DOI: 10.1007/s10482-015-0594-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 09/21/2015] [Indexed: 01/01/2023]
Abstract
The Legionella pneumophila serogroups O1, O4, O6, O7, O10 and O13 are pathogenic strains associated with pneumonia. The surface O-antigen gene clusters of L. pneumophila serogroups O4, O6, O7, O10 and O13 were sequenced and analyzed, with the function annotated on the basis of homology to that of the genes of L. pneumophila serogroup O1 (L. pneumophila subsp. pneumophila str. Philadelphia 1). The gene locus of the six L. pneumophila serogroups contains genes of yvfE, neuABCD, pseA-like for nucleotide sugar biosynthesis, wecA for sugar transfer, and wzm as well as wzt for O-antigen processing. The detection of O-antigen genes allows the fine differentiation at species and serogroup level without the neccessity of nucleotide sequencing. The O-antigen-processing genes wzm and wzt, which were found to be distinctive for different for different serogroups, have been used as the target genes for the detection and identification of L. pneumophila strains of different O serogroups. In this report, a multiplex PCR assay based on wzm or wzt that diferentiates all the six serogroups by amplicon size was developed with the newly designed specific primer pairs for O1 and O7, and the specific primer pairs for O4, O6, O10, and O13 reported previously. The array was validated by analysis of 34 strains including 15 L. pneumophila O-standard reference strains, eight reference strains of other Legionella non-pneumophila species, six other bacterial species, and five L. pneumophila environmental isolates. The detection sensitivity was one ng genomic DNA. The accurate and sensitive assay is suitable for the identification and detection of strains of these serogroups in environmental and clinical samples.
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Affiliation(s)
- Boyang Cao
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, 300457, People's Republic of China. .,TEDA Institue of Biological Sciences and Biotechnology, Nankai University, Tianjin, 300457, People's Republic of China. .,Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, People's Republic of China. .,Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, People's Republic of China.
| | - Zhenyang Tian
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, 300457, People's Republic of China.,TEDA Institue of Biological Sciences and Biotechnology, Nankai University, Tianjin, 300457, People's Republic of China.,Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, People's Republic of China.,Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, People's Republic of China
| | - Suwei Wang
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, 300457, People's Republic of China.,TEDA Institue of Biological Sciences and Biotechnology, Nankai University, Tianjin, 300457, People's Republic of China.,Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, People's Republic of China.,Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, People's Republic of China
| | - Zhiyan Zhu
- Basic Medical College, Tianjin Medical University, Tianjin, 300070, People's Republic of China
| | - Yamin Sun
- Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, People's Republic of China.,Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, People's Republic of China
| | - Lu Feng
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, 300457, People's Republic of China.,TEDA Institue of Biological Sciences and Biotechnology, Nankai University, Tianjin, 300457, People's Republic of China.,Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, People's Republic of China.,Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, People's Republic of China
| | - Lei Wang
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, 300457, People's Republic of China. .,TEDA Institue of Biological Sciences and Biotechnology, Nankai University, Tianjin, 300457, People's Republic of China. .,Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, People's Republic of China. .,Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, People's Republic of China.
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8
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Improved PCR assay for the species-specific identification and quantitation of Legionella pneumophila in water. Appl Microbiol Biotechnol 2015; 99:9227-36. [PMID: 26142386 DOI: 10.1007/s00253-015-6759-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 06/02/2015] [Accepted: 06/05/2015] [Indexed: 10/23/2022]
Abstract
Legionellosis outbreak is a major global health care problem. However, current Legionella risk assessments may be compromised by uncertainties in Legionella detection methods, infectious dose, and strain infectivity. These limitations may place public health at significant risk, leading to significant monetary losses in health care. However, there are still unmet needs for its rapid identification and monitoring of legionellae in water systems. Therefore, in the present study, a primer set was designed based on a LysR-type transcriptional regulator (LTTR) family protein gene of Legionella pneumophila subsp. pneumophila str. Philadelphia 1 because it was found that this gene is structurally diverse among species through BLAST searches. The specificity of the primer set was evaluated using genomic DNA from 6 strains of L. pneumophila, 5 type strains of other related Legionella species, and other 29 reference pathogenic bacteria. The primer set used in the PCR assay amplified a 264-bp product for only targeted six strains of L. pneumophila. The assay was also able to detect at least 1.39 × 10(3) copies/μl of cloned amplified target DNA using purified DNA or 7.4 × 10(0) colony-forming unit per reaction when using calibrated cell suspension. In addition, the sensitivity and specificity of this assay were confirmed by successful detection of Legionella pneumophila in environmental water samples.
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9
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Mercante JW, Winchell JM. Current and emerging Legionella diagnostics for laboratory and outbreak investigations. Clin Microbiol Rev 2015; 28:95-133. [PMID: 25567224 PMCID: PMC4284297 DOI: 10.1128/cmr.00029-14] [Citation(s) in RCA: 217] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Legionnaires' disease (LD) is an often severe and potentially fatal form of bacterial pneumonia caused by an extensive list of Legionella species. These ubiquitous freshwater and soil inhabitants cause human respiratory disease when amplified in man-made water or cooling systems and their aerosols expose a susceptible population. Treatment of sporadic cases and rapid control of LD outbreaks benefit from swift diagnosis in concert with discriminatory bacterial typing for immediate epidemiological responses. Traditional culture and serology were instrumental in describing disease incidence early in its history; currently, diagnosis of LD relies almost solely on the urinary antigen test, which captures only the dominant species and serogroup, Legionella pneumophila serogroup 1 (Lp1). This has created a diagnostic "blind spot" for LD caused by non-Lp1 strains. This review focuses on historic, current, and emerging technologies that hold promise for increasing LD diagnostic efficiency and detection rates as part of a coherent testing regimen. The importance of cooperation between epidemiologists and laboratorians for a rapid outbreak response is also illustrated in field investigations conducted by the CDC with state and local authorities. Finally, challenges facing health care professionals, building managers, and the public health community in combating LD are highlighted, and potential solutions are discussed.
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Affiliation(s)
- Jeffrey W Mercante
- Pneumonia Response and Surveillance Laboratory, Respiratory Diseases Branch, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Jonas M Winchell
- Pneumonia Response and Surveillance Laboratory, Respiratory Diseases Branch, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
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10
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Cao B, Liu X, Yu X, Chen M, Feng L, Wang L. A new oligonucleotide microarray for detection of pathogenic and non-pathogenic Legionella spp. PLoS One 2014; 9:e113863. [PMID: 25469776 PMCID: PMC4254607 DOI: 10.1371/journal.pone.0113863] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Accepted: 10/31/2014] [Indexed: 11/18/2022] Open
Abstract
Legionella pneumophila has been recognized as the major cause of legionellosis since the discovery of the deadly disease. Legionella spp. other than L. pneumophila were later found to be responsible to many non-pneumophila infections. The non-L. pneumophila infections are likely under-detected because of a lack of effective diagnosis. In this report, we have sequenced the 16S-23S rRNA gene internal transcribed spacer (ITS) of 10 Legionella species and subspecies, including L. anisa, L. bozemanii, L. dumoffii, L. fairfieldensis, L. gormanii, L. jordanis, L. maceachernii, L. micdadei, L. pneumophila subspp. fraseri and L. pneumophila subspp. pasculleii, and developed a rapid oligonucleotide microarray detection technique accordingly to identify 12 most common Legionella spp., which consist of 11 pathogenic species of L. anisa, L. bozemanii, L. dumoffii, L. gormanii, L. jordanis, L. longbeachae, L. maceachernii, L. micdadei, and L. pneumophila (including subspp. pneumophila, subspp. fraseri, and subspp. pasculleii) and one non-pathogenic species, L. fairfieldensis. Twenty-nine probes that reproducibly detected multiple Legionella species with high specificity were included in the array. A total of 52 strains, including 30 target pathogens and 22 non-target bacteria, were used to verify the oligonucleotide microarray assay. The sensitivity of the detection was at 1.0 ng with genomic DNA or 13 CFU/100 mL with Legionella cultures. The microarray detected seven samples of air conditioner-condensed water with 100% accuracy, validating the technique as a promising method for applications in basic microbiology, clinical diagnosis, food safety, and epidemiological surveillance. The phylogenetic study based on the ITS has also revealed that the non-pathogenic L. fairfieldensis is the closest to L. pneumophila than the nine other pathogenic Legionella spp.
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Affiliation(s)
- Boyang Cao
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, P. R. China
- TEDA School of Biological Sciences and Biotechnology, Nankai University, Tianjin, P. R. China
- Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, P. R. China
- Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, P. R. China
| | - Xiangqian Liu
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, P. R. China
- TEDA School of Biological Sciences and Biotechnology, Nankai University, Tianjin, P. R. China
- Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, P. R. China
- Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, P. R. China
| | - Xiang Yu
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, P. R. China
- TEDA School of Biological Sciences and Biotechnology, Nankai University, Tianjin, P. R. China
- Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, P. R. China
- Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, P. R. China
| | - Min Chen
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, P. R. China
- TEDA School of Biological Sciences and Biotechnology, Nankai University, Tianjin, P. R. China
- Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, P. R. China
- Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, P. R. China
| | - Lu Feng
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, P. R. China
- TEDA School of Biological Sciences and Biotechnology, Nankai University, Tianjin, P. R. China
- Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, P. R. China
- Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, P. R. China
| | - Lei Wang
- Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, TEDA College, Nankai University, Tianjin, P. R. China
- TEDA School of Biological Sciences and Biotechnology, Nankai University, Tianjin, P. R. China
- Tianjin Research Center for Functional Genomics and Biochips, TEDA College, Nankai University, Tianjin, P. R. China
- Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College, Nankai University, Tianjin, P. R. China
- * E-mail:
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11
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Development of a DNA microarray method for detection and identification of all 15 distinct O-antigen forms of Legionella pneumophila. Appl Environ Microbiol 2013; 79:6647-54. [PMID: 23974134 DOI: 10.1128/aem.01957-13] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Legionella is ubiquitous in many environments. At least 50 species and 70 serogroups of the Gram-negative bacterium have been identified. Of the 50 species, 20 are pathogenic, and Legionella pneumophila is responsible for the great majority (approximately 90%) of the Legionnaires' disease cases that occur. Furthermore, of the 15 L. pneumophila serogroups identified, O1 alone causes more than 84% of the Legionnaires' disease cases that occur worldwide. Rapid and reliable assays for the detection and identification of L. pneumophila in water, environmental, and clinical samples are in great demand. L. pneumophila bacteria are traditionally identified by their O antigens by immunological methods. We have recently developed an O serogroup-specific DNA microarray for the detection of all 15 distinct O-antigen forms of L. pneumophila, including serogroups O1 to O15. A total of 35 strains were used to verify the specificity of the microarray, including 15 L. pneumophila O-antigen standard reference strains and seven L. pneumophila clinical isolates as target strains, seven reference strains of other non-pneumophila Legionella species as closely related strains, and six non-Legionella bacterial species as nonrelated strains. The detection sensitivity was 1 ng of genomic DNA or 0.4 CFU/ml in water samples with filter enrichment and plate culturing. This study demonstrated that the microarray allows specific, sensitive, and reproducible detection of L. pneumophila serogroups. To the best of our knowledge, this is the first report of a microarray serotyping method for all 15 distinct O-antigen forms of L. pneumophila.
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12
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Bousbia S, Raoult D, La Scola B. Pneumonia pathogen detection and microbial interactions in polymicrobial episodes. Future Microbiol 2013; 8:633-60. [DOI: 10.2217/fmb.13.26] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Recent reports show that microbial communities associated with respiratory infections, such as pneumonia and cystic fibrosis, are more complex than expected. Most of these communities are polymicrobial and might comprise microorganisms originating from several diverse biological and ecological sources. Moreover, unexpected bacteria in the etiology of these respiratory infections have been increasingly identified. These findings were established with the use of efficient microbiological diagnostic tools, particularly molecular tools based on common gene amplification, followed by cloning and sequencing approaches, which facilitated the identification of the polymicrobial flora. Similarly, recent investigations reported that microbial interactions might exist between species in polymicrobial communities, including typical pneumonia pathogens, such as Pseudomonas aeruginosa and Candida albicans. Here, we review recent tools for microbial diagnosis, in particular, of intensive care unit pneumonia and the reported interactions between microbial species that have primarily been identified in the etiology of these infections.
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Affiliation(s)
- Sabri Bousbia
- Aix-Marseille Université, URMITE, UM 63, CNRS 7278, IRD 198, INSERM U1095, Facultés de Médecine, Marseille, France
- IHU Méditerranée Infection, Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Assistance Publique – Hôpitaux de Marseille, Marseille, France
| | - Didier Raoult
- Aix-Marseille Université, URMITE, UM 63, CNRS 7278, IRD 198, INSERM U1095, Facultés de Médecine, Marseille, France
- IHU Méditerranée Infection, Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Assistance Publique – Hôpitaux de Marseille, Marseille, France
| | - Bernard La Scola
- IHU Méditerranée Infection, Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Assistance Publique – Hôpitaux de Marseille, Marseille, France
- Aix-Marseille Université, URMITE, UM 63, CNRS 7278, IRD 198, INSERM U1095, Facultés de Médecine, Marseille, France.
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Barth VC, Cattani F, Ferreira CA, de Oliveira SD. Sodium chloride affects propidium monoazide action to distinguish viable cells. Anal Biochem 2012; 428:108-10. [DOI: 10.1016/j.ab.2012.06.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 06/06/2012] [Accepted: 06/07/2012] [Indexed: 10/28/2022]
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