Williams D W, Wilson M J, Lewis M A, Potts A J
Department of Oral Surgery, Medicine and Pathology, Dental School, University of Wales, College of Medicine, Cardiff CF4 4XY.
Clin Mol Pathol. 1996 Feb;49(1):M23-8. doi: 10.1136/mp.49.1.m23.
Aim-To identify Candida species in formalin fixed, paraffin wax embedded tissue by sequencing candidal rDNA.Methods-Target rDNA sequences were amplified by polymerase chain reaction (PCR) from fresh isolates of Candida and from 18 preserved oral mucosal tissue samples (16 cases of chronic hyperplastic candidiasis and two fibroepithelial polyps), shown histologically to contain Candida. Identification of Candida species within tissue was based on a comparison of the rDNA sequences obtained with those from the fresh isolates of Candida and those present in the GenBank database.Results-The PCR products obtained from 12 of the 18 tissue specimens studied were characteristic of Candida albicans. In two of these cases a second, larger PCR product was obtained and these sequences were characteristic of Candida glabrata.Conclusions-Candidal DNA was amplified successfully from formalin fixed, paraffin wax embedded tissue. Sequencing of the PCR product enabled identification of the Candida species present.
目的——通过对念珠菌核糖体DNA进行测序,鉴定福尔马林固定、石蜡包埋组织中的念珠菌种类。方法——通过聚合酶链反应(PCR)从念珠菌新鲜分离株以及18份保存的口腔黏膜组织样本(16例慢性增生性念珠菌病和2例纤维上皮息肉)中扩增目标核糖体DNA序列,组织学检查显示这些样本含有念珠菌。基于所获得的核糖体DNA序列与念珠菌新鲜分离株及GenBank数据库中序列的比较,鉴定组织内的念珠菌种类。结果——在所研究的18个组织标本中,12个标本的PCR产物具有白色念珠菌的特征。其中2例还获得了另一种更大的PCR产物,这些序列具有光滑念珠菌的特征。结论——成功从福尔马林固定、石蜡包埋组织中扩增出念珠菌DNA。对PCR产物进行测序能够鉴定出存在的念珠菌种类。