Fujita S, Lasker B A, Lott T J, Reiss E, Morrison C J
Central Clinical Laboratory, Kanazawa University Hospital, Kanazawa, Japan.
J Clin Microbiol. 1995 Apr;33(4):962-7. doi: 10.1128/jcm.33.4.962-967.1995.
We developed a microtitration plate enzyme immunoassay to detect PCR-amplified DNA from Candida species. Nucleotide sequences derived from the internal transcribed spacer (ITS) region of fungal rDNA were used to develop species-specific oligonucleotide probes for Candida albicans, C. tropicalis, C. parapsilosis, and C. krusei. No cross-hybridization was detected with any other fungal, bacterial, or human DNAs tested. In contrast, a C. (Torulopsis) glabrata probe cross-reacted with Saccharomyces cerevisiae DNA but with no other DNAs tested. Genomic DNA purified from C. albicans blastoconidia suspended in blood was amplified by PCR with fungus-specific universal primers ITS3 and ITS4. With the C. albicans-specific probe labeled with digoxigenin, a biotinylated capture probe, and streptavidin-coated microtitration plates, amplified DNA from a few as two C. albicans cells per 0.2 ml of blood could be detected by enzyme immunoassay.
我们开发了一种微量滴定板酶免疫测定法,用于检测念珠菌属经聚合酶链反应(PCR)扩增的DNA。从真菌核糖体DNA的内部转录间隔区(ITS)区域获得的核苷酸序列,被用于开发针对白色念珠菌、热带念珠菌、近平滑念珠菌和克柔念珠菌的种特异性寡核苷酸探针。在所检测的任何其他真菌、细菌或人类DNA中均未检测到交叉杂交现象。相比之下,光滑念珠菌(Torulopsis)探针与酿酒酵母DNA发生交叉反应,但与所检测的其他DNA均无交叉反应。用真菌特异性通用引物ITS3和ITS4通过PCR扩增从悬浮于血液中的白色念珠菌芽生孢子中纯化的基因组DNA。使用用地高辛标记的白色念珠菌特异性探针、生物素化捕获探针和链霉抗生物素蛋白包被的微量滴定板,通过酶免疫测定法能够检测出每0.2 ml血液中低至两个白色念珠菌细胞的扩增DNA。