In situ aneuploidy assessment in human sperm:the use of primed in situ and peptide nucleic acid-fluorescence in situ hybridization techniques

Both the primed in situ(PRINS)and the peptide nucleic acid-fluorescence in situ hybridization(PNA-FISH) techniques constitute alternatives to the conventional(fluorescence in situ hybridization,FISH)procedure for chro- mosomal investigations.The PRINS reaction is based on the use of a DNA polymerase and labeled nucleotide in an in situ primer extension reaction.Peptide nucleic acid probes are synthetic DNA analogs with uncharged polyamide backbones.The two procedures present several advantages(specificity,rapidity and discriminating ability)that make them very attractive for cytogenetic purposes.Their adaptation to human spermatozoa has allowed the development of new and fast procedures for the chromosomal screening of male gametes and has provided efficient complements to FISH for in situ assessment of aneuploidy in male gametes.(Asian J Androl 2006 Jul;8:387-392)

快速鉴定白念珠菌的临床应用研究

目的探究肽核酸-荧光原位杂交(PNA-FISH)、基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)快速鉴定白念珠菌的临床应用价值。方法采用经VITEK 2 Compact全自动细菌鉴定仪YST卡鉴定白念珠菌100株,模拟血培养阳性标本。对报阳的标本直接进行PNA-FISH鉴定,再转种培养出单个新鲜菌落,完成MALDI-TOF MS鉴定。记录两种方法鉴定白念珠菌结果和鉴定所需时间,计算其与VITEK 2 Compact全自动细菌鉴定方法的符合率。结果100株白念珠菌模拟血培养样本,PNA-FISH鉴定结果与VITEK 2 Compact全自动细菌鉴定方法的符合率为98%,平均鉴定时间为(2.5±0.5)h。采用MALDI-TOF MS鉴定报阳后单个新鲜菌落,与VITEK 2 Compact全自动细菌鉴定方法的符合率达100%,从血培养报阳开始计算,平均鉴定时间为(22.0±0.6)h。结论PNA-FISH方法鉴定白念珠菌,设备简单,鉴定结果可靠,相较于传统鉴定方法和MALDI-TOF MS方法,鉴定时间显著缩短,有较好的临床应用前景。