ตรวจสอบความถูกต้องLoop-mediated isothermal amplification (LAMP) allows rapid amplification
of nucleic acids under isothermal condition was detection of Pseudomonas aeruginosa
(P. aeruginosa) is a gram-negative bacteria and be found in many natural. P. aeruginosa is major human opportunistic pathogen and common cause of nosocomial infections. It is responsible of infections in patients with cystic fibrosis (CF) and in burned or immuno-compromised individuals. Furthermore P. aeruginosa can cause microbial keratitis because of most common corneal isolates. Previous research found contact lens contamination have shown high numbers of Gram-negative bacteria and many reports of infectious keratitis patient had who worn and purchased contact lens via the internet also found patients increased risk of microbial keratitis. This study use of the LAMP assay for amplification of
P. aeruginosa by species-specific primer to detect ecfX gene. The optimum conditions was 60 min at 65°C, MgSO4 concentration at 6.0 mM, Bst DNA polymerase 8U, dNTP mix concentration of 1.4 mM and prevent false-positive reaction, using uracil-DNA glycosylase (UDG) and dUTP was substituted for dTTP resulting show no cross-reaction with non-P.aeruginosa. In addition, the LAMP-AuNP method required 60 min for LAMP and 5 min for hybridization of LAMP products to an AuNP-labaled ssDNA probe followed by salt induced probe-particle aggregation to visualize color develpment and using biotin-labeled primer hybridization with FITC-labeled DNA probe at 5 min and result of DAN amplicon could be visualized trapped at the LFD test line within 5 min, which avoids the use of gel electrophoresis, for detect the sensitivity in pure cultures was 1.670 x 103 CFU mL-1 or 3.10 CFU reaction-1 while that of conventional PCR was 1.670 x 104 CFU mL-1 or 31.0 CFU reaction-1. In case of spiked contact lens sample was 1.080 x 102 CFU mL-1 or 2.00 CFU reaction-1 while that of conventional PCR was 1.080 x 103 CFU mL-1 or 20.0 CFU reaction-1, the LAMP-AuNP and LAMP-LFD was more sensitive than conventional PCR for detection of P. aeruginosa. Therefore, the results indicated this assay targeting ecfX gene is a simple, short analysis time, specific, high sensitivity for detection of P. aeruginosa and application to detect of other pathogen for field laboratory and control and screening.
ของประโยค
ตรวจสอบความถูกต้องLoop-mediated isothermal amplification (LAMP) allows rapid amplification of nucleic acids under isothermal condition was detection of Pseudomonas aeruginosa (P. aeruginosa) is a gram-negative bacteria and be found in many natural. P. aeruginosa is major human opportunistic pathogen and common cause of nosocomial infections. It is responsible of infections in patients with cystic fibrosis (CF) and in burned or immuno-compromised individuals. Furthermore P. aeruginosa can cause microbial keratitis because of most common corneal isolates. Previous research found contact lens contamination have shown high numbers of Gram-negative bacteria and many reports of infectious keratitis patient had who worn and purchased contact lens via the internet also found patients increased risk of microbial keratitis. This study use of the LAMP assay for amplification of P. aeruginosa by species-specific primer to detect ecfX gene. The optimum conditions was 60 min at 65°C, MgSO4 concentration at 6.0 mM, Bst DNA polymerase 8U, dNTP mix concentration of 1.4 mM and prevent false-positive reaction, using uracil-DNA glycosylase (UDG) and dUTP was substituted for dTTP resulting show no cross-reaction with non-P.aeruginosa. In addition, the LAMP-AuNP method required 60 min for LAMP and 5 min for hybridization of LAMP products to an AuNP-labaled ssDNA probe followed by salt induced probe-particle aggregation to visualize color develpment and using biotin-labeled primer hybridization with FITC-labeled DNA probe at 5 min and result of DAN amplicon could be visualized trapped at the LFD test line within 5 min, which avoids the use of gel electrophoresis, for detect the sensitivity in pure cultures was 1.670 x 103 CFU mL-1 or 3.10 CFU reaction-1 while that of conventional PCR was 1.670 x 104 CFU mL-1 or 31.0 CFU reaction-1. In case of spiked contact lens sample was 1.080 x 102 CFU mL-1 or 2.00 CFU reaction-1 while that of conventional PCR was 1.080 x 103 CFU mL-1 or 20.0 CFU reaction-1, the LAMP-AuNP and LAMP-LFD was more sensitive than conventional PCR for detection of P. aeruginosa. Therefore, the results indicated this assay targeting ecfX gene is a simple, short analysis time, specific, high sensitivity for detection of P. aeruginosa and application to detect of other pathogen for field laboratory and control and screening.ของประโยค
การแปล กรุณารอสักครู่..
