Abbaszadegan M, Huber M S, Gerba C P, Pepper I L
Quality Control & Research Laboratory, American Water Works Service Company, Inc., Belleville, Illinois 62220, USA.
Appl Environ Microbiol. 1997 Jan;63(1):324-8. doi: 10.1128/aem.63.1.324-328.1997.
Primers obtained from gene sequences coding for heat shock proteins (HSP) were used to specifically detect enteric protozoans of the genus Giardia. The HSP primers amplified Giardia DNA or the corresponding RNA sequences obtained from lysed cysts and gave a 163-bp product. Since the presence of the product did not indicate whether the cysts were viable, these amplifications are a presence/absence test only. In contrast, amplification of heat shock-induced mRNA utilizing the same HSP primers was indicative of viable Giardia cysts. The limit of sensitivity of the presence/absence test was 1 cyst, whereas for the viability test it was 10 cysts. Thus, viable Giardia cysts can be rapidly and specifically detected with great sensitivity through the use of PCR amplifications.
从编码热休克蛋白(HSP)的基因序列中获得的引物被用于特异性检测贾第虫属的肠道原生动物。HSP引物扩增了从裂解囊肿中获得的贾第虫DNA或相应的RNA序列,并产生了一个163bp的产物。由于产物的存在并不表明囊肿是否存活,这些扩增仅为存在/不存在检测。相比之下,利用相同的HSP引物扩增热休克诱导的mRNA则表明贾第虫囊肿是存活的。存在/不存在检测的灵敏度极限为1个囊肿,而活力检测的灵敏度极限为10个囊肿。因此,通过使用PCR扩增,可以快速、特异性且高度灵敏地检测存活的贾第虫囊肿。