Detecting Micro-luminescence of 330 Codon in emb gene of Mycobacterium tuberculosis by Molecular Beacon Hybridization / 中华医院感染学杂志

OBJECTIVE To design molecular beacon detecting embB330 codon of ethambutol-resistant Mycobacterium tuberculosis(MTB),meanwhile,and try to detect fluorescence of mutation site of embB330 codon in liquid by fluorescence microscope by compareing the mutation strains and standard strains.METHODS The software,Beacon designer,was used to design molecular beacon detecting embB330codon and detecting fluorescence signal from hybridization between the amplified product and probe by fluorescence microscope,and to confer to the sequencing results.RESULTS The difference between PCR products from standard strain and ethambutol-resistant one was obvious in detecting the fluorescent light by use of fluorescence microscope.We detected fluorescent light signal between the 33 ethambutol-resistant strains and 10 H37RV standard strains.The rate of ethambutol-resistant strains was about 3%,and the rate of sequencing was about 3%.CONCLUSIONS The technology of molecular beacon effectually can detect mutation single base site of embB330codon.Fluorescence microscope owns characteristics such as high sensitiveness to detect the fluorescent light.

The study on detecting mutation site of 306 codon in Ethambutol resistant embB gene of Mycobacterium tuberculosis bacterium by hair clamp probe / 重庆医科大学学报

Objective:To design hair clamp probe and the probes with single extending arm detecting embB306codon of Ethambutol resis-tant Mycobacterium tuberculosis bacterium(MTB),meanwhile,to design fair clamp probe chip and detecting fluorescence signal from hy-bridization between the amplified product and probe by fluorescence microscope.Methods:The software,Beacon designer,was used to de-sign fair clamp probe and the probes with single extending arm detecting embB303codon and detecting fluorescence signal from hybridiza-tion between the amplified product and probe,and confer to the sequencing results.Results:The difference between PCR products from standard strain and ethambutol resistant one was obvious in detecting the fluorescent light with fluorescence microscope.We detected fluo-rescent light signal between the 33 ethambutol resistant strains and 10 H37RV standard strains.The rate of resistant ethambutol detected with hair clamp probe was about 66%,and the rate of sequencing was about 69%.Conclusions:The mutation site of embB306codon of MTB is the main reason of ethambutol resistant MTB.The technology of fair clamp DNA probe chip can effectively detect mutation of single base site.Fluorescence microscope can sensitivily detect the site of hybridization on fluorescence chip.