TY - JOUR
T1 - Real-time molecular beacon NASBA reveals hblC expression from Bacillus spp. in milk
AU - Gore, Hope M.
AU - Wakeman, Catherine A.
AU - Hull, Rhiannon M.
AU - McKillip, John L.
PY - 2003/11/14
Y1 - 2003/11/14
N2 - Nucleic acid sequence-based amplification (NASBA) was applied in combination with a fluorescein-conjugated molecular beacon specific for a sequence flanked by transcript-specific primers in order to monitor hblC enterotoxin gene expression in real-time from milk separately contaminated with Bacillus amyloliquefaciens, Bacillus cereus, and Bacillus circulans. Maximal enterotoxin expression was noted following 16, 15, and 16h, respectively, when grown in artificially contaminated nonfat dried milk incubated aerobically at 32°C, corresponding to 1.6×105, 5×107, and 9.8×104cfu/ml, for B. amyloliquefaciens, B. cereus, and B. circulans, respectively. This RNA amplification assay allows for simultaneous detection and confirmation of target transcripts in a closed tube format and may be performed in a high DNA background. The development of a rapid, sensitive, real-time method to quantitate the expression of virulence genes in pathogenic spore-formers is useful in shelf life determination of foods and other quality assurance measures.
AB - Nucleic acid sequence-based amplification (NASBA) was applied in combination with a fluorescein-conjugated molecular beacon specific for a sequence flanked by transcript-specific primers in order to monitor hblC enterotoxin gene expression in real-time from milk separately contaminated with Bacillus amyloliquefaciens, Bacillus cereus, and Bacillus circulans. Maximal enterotoxin expression was noted following 16, 15, and 16h, respectively, when grown in artificially contaminated nonfat dried milk incubated aerobically at 32°C, corresponding to 1.6×105, 5×107, and 9.8×104cfu/ml, for B. amyloliquefaciens, B. cereus, and B. circulans, respectively. This RNA amplification assay allows for simultaneous detection and confirmation of target transcripts in a closed tube format and may be performed in a high DNA background. The development of a rapid, sensitive, real-time method to quantitate the expression of virulence genes in pathogenic spore-formers is useful in shelf life determination of foods and other quality assurance measures.
KW - Enterotoxigenic Bacillus spp.
KW - Gene expression
KW - Molecular beacon
KW - NASBA
KW - Real-time detection
UR - http://www.scopus.com/inward/record.url?scp=0242331284&partnerID=8YFLogxK
U2 - 10.1016/j.bbrc.2003.10.016
DO - 10.1016/j.bbrc.2003.10.016
M3 - Article
C2 - 14592426
AN - SCOPUS:0242331284
SN - 0006-291X
VL - 311
SP - 386
EP - 390
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
IS - 2
ER -