Regulation of the Edwardsiella tarda Hemolysin Gene and luxS by EthR

2009 ◽  
Author(s):  
Li Sun
Keyword(s):  
Edwardsiella Tarda ◽  
Hemolysin Gene

scholarly journals Sensitive and Rapid Detection of Edwardsiellosis in Fish by a Loop-Mediated Isothermal Amplification Method

2004 ◽  
Vol 70 (1) ◽  
pp. 621-624 ◽  
Author(s):  
Ram Savan ◽  
Arisa Igarashi ◽  
Satoru Matsuoka ◽  
Masahiro Sakai
Keyword(s):  
Rapid Detection ◽  
Japanese Flounder ◽  
Isothermal Amplification ◽  
Edwardsiella Tarda ◽  
Fish Disease ◽  
Fish Pathogen ◽  
Loop Mediated Isothermal Amplification ◽  
Diagnostic Protocol ◽  
Amplification Method ◽  
Hemolysin Gene

ABSTRACT Here we report a rapid and sensitive method (using loop-mediated isothermal amplification [LAMP]) for the diagnosis of edwardsiellosis, a fish disease caused by Edwardsiella tarda, in Japanese flounder. A set of four primers was designed, and conditions for the detection were optimized for the detection of E. tarda in 45 min at 65°C. No amplification of the target hemolysin gene was detected in other related bacteria. When the LAMP primers were used, detection of edwardsiellosis in infected Japanese flounder kidney, and spleen and seawater cultures was possible. We have developed a rapid and sensitive diagnostic protocol for edwardsiellosis detection in fish. This is the first report of the application of LAMP for the diagnosis of a fish pathogen.

Molecular cloning, characterization, and sequencing of the hemolysin gene from Edwardsiella tarda

1996 ◽  
Vol 165 (1) ◽  
pp. 9-17 ◽  
Author(s):  
J.-D. Chen ◽  
Shau-Yan Lai ◽  
Shiang-Long Huang
Keyword(s):  
Molecular Cloning ◽  
Edwardsiella Tarda ◽  
Hemolysin Gene

Viability of Edwardsiella tarda and Esherichia coli preserved with glycerol-tryptone soy broth (TSB) kept at freezing temperature

2013 ◽  
Vol 1 (2) ◽  
pp. 154
Author(s):  
Abdur Rohman ◽  
Frans Ijong ◽  
I K Suwetja
Keyword(s):  
Research And Development ◽  
Germ Plasm ◽  
Freezing Temperature ◽  
Experimental Methods ◽  
Edwardsiella Tarda ◽  
Diagnostic Tools ◽  
Glycerol Concentration ◽  
E Coli ◽  
Esherichia Coli ◽  
Escherchia Coli

Preservation of bacteria carried out in relation to the collection and preservation of germ plasm microbe is useful for research and development or for the establishment of diagnostic tools. Glycerol is a good preservation media but it is not known what doses should be used for effective preservation.  This research used two experimental  methods consisting of 2 factors and 3 treatments. This study aimed to find the best glycerol concentration that can be used to preserve Edwarsiella tarda and Escherchia coli in the -20ºC environment, to understand the viability of bacteria after being preserved and to describe the characteristics of the preserved bacteria. Treatments applied were 10%, 15% and 20%  glycerol in TSB. Viability of the bacteria was analyzed after 7, 14, 28, 35, and 42 days of preservation. Results showed that E.coli bacteria preserved in 15%  glycerol had the highest viability, i.e. 84% and preserved in 10% glycerol had the lowest viability, i.e. 80%. But for E. tarda bacteria preserved in 10% glycerol had the highest viability, i.e. 1.83% and preseved in 15% glycerol had the lowest viability, i.e. 0,55%. Preservasi bakteri dilakukan dalam kaitannya dengan koleksi dan konservasi plasma nutfah mikroba yang berguna untuk penelitian dan pengembangan atau untuk pembentukan alat diagnosa. Gliserol merupakan bahan preservasi yang baik, tetapi belum diketahui dosis yang baik dan efektif untuk preservasi bakteri Edwarsiella tarda dan Escherchia coli pada suhu -20ºC. Penelitian ini dilakukan dengan metode eksperimen yang terdiri dari 2 faktor dan 3 taraf perlakuan, masing-masing perlakuan dengan 3 kali ulangan, media preservasi yang digunakan adalah TSB dan gliserol dengan konsentrasi 10%, 15% dan 20%. Parameter yang diukur adalah viabilitas dan kecocokan/penyimpangan karakteristik biokimia. Penelitian ini dilaksanakan di Laboratorium Balai Karantina Ikan Pengendalian Mutu dan Keamanan Hasil Perikanan Manado, dari bulan September sampai dengan November 2013. Tujuan Penelitian ini adalah untuk menentukan konsentrasi gliserol dalam TSB sebagai media preservasi yang efektif dan efisien pada bakteri  Edwarsiella tarda dan Escherchia coli yang dipreservasi dengan suhu -20ºC dan disimpan selama 42  hari. Hasil penelitian menunjukkan adanya penurunan laju pertumbuhan bakteri selama preservasi. Persentase viabilitas  bakteri E. coli yang tertinggi selama preservasi diperoleh dengan penggunaan gliserol konsentrasi 15% dengan jumlah 84% dan yang terendah adalah dengan penggunaan konsentrasi 10% yakni sebesar 80%, sedangkan untuk E. tarda persentase viabilitas  bakteri yang tertinggi selama preservasi diperoleh dengan penggunaan gliserol konsentrasi 10% dengan jumlah 1,83% dan yang terendah adalah dengan penggunaan konsentrasi 15% yakni sebesar 0,55%. Berdasarkan uji statistik analisis variasi (ANAVA) didapat hasil F hitung E. tarda dan E. coli yang lebih besar  dari FTabel dengan tingkat kepercayaan 95 %.

Virulence genes and dulplex PCR and the LAMP methods for the detection of pathogenic Edwardsiella tarda

2013 ◽  
Vol 37 (7) ◽  
pp. 1087
Author(s):  
Xiaojun ZHANG ◽  
Xuesong BAI ◽  
Keran BI ◽  
Binlun YAN ◽  
Lei QIN ◽  
...  
Keyword(s):  
Virulence Genes ◽  
Edwardsiella Tarda

Nuevos genes relacionados con el sistema secretor tipo 4 de Edwardsiella tarda

Orinoquia ◽  
2015 ◽  
Vol 19 (2) ◽  
pp. 186 ◽  
Author(s):  
Noel Verjan-García ◽  
A. Carlos ◽  
Iregui Ikuo Hirono
Keyword(s):  
Edwardsiella Tarda ◽  
El Sistema

scholarly journals Effects of Green Alga, Chaetomorpha aerea Extract on Non-Specific Immune Responses and Disease Resistance against Edwardsiella tarda Infection in Labeo rohita

2021 ◽  
Vol 11 (10) ◽  
pp. 4325
Author(s):  
Govindharajan Sattanathan ◽  
Vairakannu Tamizhazhagan ◽  
Nadeem Raza ◽  
Syed Qaswar Ali Shah ◽  
Muhammad Zubair Hussain ◽  
...  
Keyword(s):  
Immune Responses ◽  
Green Alga ◽  
Labeo Rohita ◽  
Virulent Strain ◽  
Edwardsiella Tarda ◽  
Fish Mortality ◽  
Control Group ◽  
Physiological Salt Solution ◽  
Myeloperoxidase Activity ◽  
Chaetomorpha Aerea

The current study evaluated the effects of a methanol extract from Chaetomorpha aerea (a green alga) on non-specific immune responses and resistance against Edwardsiella tarda infection in Labeo rohita. Different doses of the extract (5, 50 and 500 mg/kg of body weight) were injected into the fish intraperitoneally while a control group was injected with 0.2 mL of sterile physiological salt solution. Variations in several immunostimulatory parameters (i.e., neutrophil, serum lysozyme, myeloperoxidase, serum antiprotease, and ceruloplasmin activity), reactive oxygen species (ROS) and reactive nitrogen species (RNS) were assessed after 7, 14, 21, and 28 days of post stimulation. E. tarda culture was injected into the fish after 28 days of post stimulation to induce infection to monitor fish mortality within 14 days. Interestingly, all doses of methanolic extract enhanced neutrophil, lysozyme, and myeloperoxidase activity, ROS and RNS, while a dose of 50 mg/kg was the most effective. Fish injected with this optimal dose were also protected against infection with virulent strain of E. tarda. The results of the study suggest that C. aerea extract is a potential prophylactic agent against bacterial infections in finfish.

scholarly journals Relationships between Environmental Factors and Pathogenic Vibrios in the Northern Gulf of Mexico

2010 ◽  
Vol 76 (21) ◽  
pp. 7076-7084 ◽  
Author(s):  
C. N. Johnson ◽  
A. R. Flowers ◽  
N. F. Noriea ◽  
A. M. Zimmerman ◽  
J. C. Bowers ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Water Column ◽  
Vibrio Vulnificus ◽  
Environmental Parameters ◽  
Sampling Period ◽  
Pathogenicity Factor ◽  
Hemolysin Gene ◽  
Thermostable Direct Hemolysin ◽  
Pathogenic Vibrios ◽  
Abundance And Distribution

ABSTRACT Although autochthonous vibrio densities are known to be influenced by water temperature and salinity, little is understood about other environmental factors associated with their abundance and distribution. Densities of culturable Vibrio vulnificus containing vvh (V. vulnificus hemolysin gene) and V. parahaemolyticus containing tlh (thermolabile hemolysin gene, ubiquitous in V. parahaemolyticus), tdh (thermostable direct hemolysin gene, V. parahaemolyticus pathogenicity factor), and trh (tdh-related hemolysin gene, V. parahaemolyticus pathogenicity factor) were measured in coastal waters of Mississippi and Alabama. Over a 19-month sampling period, vibrio densities in water, oysters, and sediment varied significantly with sea surface temperature (SST). On average, tdh-to-tlh ratios were significantly higher than trh-to-tlh ratios in water and oysters but not in sediment. Although tlh densities were lower than vvh densities in water and in oysters, the opposite was true in sediment. Regression analysis indicated that SST had a significant association with vvh and tlh densities in water and oysters, while salinity was significantly related to vibrio densities in the water column. Chlorophyll a levels in the water were correlated significantly with vvh in sediment and oysters and with pathogenic V. parahaemolyticus (tdh and trh) in the water column. Furthermore, turbidity was a significant predictor of V. parahaemolyticus density in all sample types (water, oyster, and sediment), and its role in predicting the risk of V. parahaemolyticus illness may be more important than previously realized. This study identified (i) culturable vibrios in winter sediment samples, (ii) niche-based differences in the abundance of vibrios, and (iii) predictive signatures resulting from correlations between environmental parameters and vibrio densities.

scholarly journals A zebrafish model of infection-associated acute kidney injury

2018 ◽  
Vol 315 (2) ◽  
pp. F291-F299 ◽  
Author(s):  
Xiaoyan Wen ◽  
Liyan Cui ◽  
Seth Morrisroe ◽  
Donald Maberry ◽  
David Emlet ◽  
...  
Keyword(s):  
Acute Kidney Injury ◽  
Unmet Need ◽  
Kidney Injury ◽  
Edwardsiella Tarda ◽  
Adult Zebrafish ◽  
Zebrafish Model ◽  
Pericardial Edema ◽  
Kidney Injury Molecule 1 ◽  
Dose Dependent

Sepsis-associated acute kidney injury (S-AKI) independently predicts mortality among critically ill patients. The role of innate immunity in this process is unclear, and there is an unmet need for S-AKI models to delineate the pathophysiological response. Mammals and zebrafish ( Danio rerio) share a conserved nephron structure and homologous innate immune systems, making the latter suitable for S-AKI research. We introduced Edwardsiella tarda to the zebrafish. Systemic E. tarda bacteremia resulted in sustained bacterial infection and dose-dependent mortality. A systemic immune reaction was characterized by increased mRNA expressions of il1b, tnfa, tgfb1a, and cxcl8-l1 ( P < 0.0001, P < 0.001, P < 0.001, and P < 0.01, respectively). Increase of host stress response genes ccnd1 and tp53 was observed at 24 h postinjection ( P < 0.0001 and P < 0.05, respectively). Moderate E. tarda infection induced zebrafish mortality of over 50% in larvae and 20% in adults, accompanied by pericardial edema in larvae and renal dysfunction in both larval and adult zebrafish. Expression of AKI markers insulin-like growth factor-binding protein-7 (IGFBP7), tissue inhibitor of metalloproteinases 2 (TIMP-2), and kidney injury molecule-1 (KIM-1) was found to be significantly increased in the septic animals at the transcription level ( P < 0.01, P < 0.05, and P < 0.05) and in nephric tubules compared with noninfected animals. In conclusion, we established a zebrafish model of S-AKI induced by E. tarda injection, with both larval and adult zebrafish showing nephron injury in the setting of infection.

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