Development of a loop-mediated isothermal amplification (LAMP) for the detection of F5 fimbriae gene in enterotoxigenic Escherichia coli (ETEC).
The objective of this study was to establish a loop-mediated isothermal amplification (LAMP) method for the detection of F5 fimbriae gene in Enterotoxigenic Escherichia coli. A set of four primers were designed based on the conservative sequence of coding F5 fimbriae. Temperature and time condition, specificity test, and sensitivity test were performed with the DNA of Escherichia coli (F5+). The results showed that the optimal reaction condition for LAMP was achieved at 61 °C for 45 min in a water bath. Ladder-like products were produced with those F5-positive samples by LAMP, while no product was generated with other negative samples. The assay of LAMP had a detection limit equivalent to 72 cfu/tube, which was more sensitive than PCR (7.2 × 10(2) cfu/tube). The agreement rate between LAMP and PCR was 100 % in detecting simulation samples. Thus, the LAMP assay may be a new method for rapid detection of F5 fimbriae gene of ETEC.
Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang, Harbin, Heilongjiang, China.
Kuiyu
K
Jiang
Ying
Y
Zhu
Wenxin
W
Liu
Yufei
Y
Feng
Lili
L
He
Weikun
W
Guan
Wenxia
W
Hu
Dongfang
D
Shi
D017931:DNA Primers / Q000235:genetics; D054307:Enterotoxigenic Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins / Q000235:genetics*; D010861:Fimbriae, Bacterial / Q000235:genetics*; D021141:Nucleic Acid Amplification Techniques / Q000379:methods*; D012680:Sensitivity and Specificity
D017931:DNA Primers; D029968:Escherichia coli Proteins