Multiplex real-time PCR assay for simultaneous detection of Omphalotus guepiniformis and Lentinula edodes.
A rapid multiplex real-time PCR assay was developed to achieve highly specific, simultaneous detection of two kinds of mushrooms, Omphalotus guepiniformis and Lentinula edodes. Primers and TaqMan minor groove binder probes were designed according to the internal transcribed spacers 1-5.8S region of rDNA and evaluated by the specificity for fruiting bodies of 17 O. guepiniformis, 16 L. edodes and samples from 57 other species. DNA extracts of all the target species had positive signals with no cross-reaction, the limit of detection being 0.00025 ng of DNA. Threshold cycle (Ct) values for raw and processed fruiting bodies and for fruiting bodies (1% (w/w)) mixed with foodstuffs or artificial gastric juice contents ranged from 17.16 to 26.60 for both examined species. This new assay proved specific to the target species, highly sensitive, and applicable to processed food samples and gastric juice contents, making it useful for rapidly identifying O. guepiniformis and L. edodes.
Fukuoka City Institute for Hygiene and the Environment, Fukuoka, Japan. tsuruda.s02@city.fukuoka.lg.jp
Sayuri
S
Tsuruda
Kouichi
K
Akaki
Hiroshi
H
Hiwaki
Akira
A
Suzuki
Hiroshi
H
Akiyama
D000363:Agaricales / Q000235:genetics / Q000302:isolation & purification*; D017931:DNA Primers / Q000235:genetics; D015342:DNA Probes / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics / Q000302:isolation & purification*; D021903:DNA, Ribosomal Spacer / Q000235:genetics / Q000302:isolation & purification; D005504:Food Analysis; D048690:Fruiting Bodies, Fungal / Q000235:genetics / Q000302:isolation & purification*; D005750:Gastric Juice / Q000737:chemistry; D060885:Multiplex Polymerase Chain Reaction / Q000379:methods*; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity; D020942:Shiitake Mushrooms / Q000235:genetics / Q000302:isolation & purification*
D017931:DNA Primers; D015342:DNA Probes; D004271:DNA, Fungal; D021903:DNA, Ribosomal Spacer