Generation and analysis of 113 adult stage Schistosoma japonicum (Chinese strain) expressed sequence tags  

113个日本血吸虫 (中国大陆株 )成虫表达序列标签的获取及分析(英文)

作　　者：卞国武[1] 余新炳[1] 吴忠道[1] 

机构地区：[1]中山医科大学寄生虫教研室,广州510089

出　　处：《Chinese Medical Journal》2002年第10期77-80,150-151,共6页中华医学杂志（英文版）

基　　金：ThisprojectwassupportedbyNationalNaturalScienceFoundationofChina (No 30 0 70 683 )

摘　　要：To rapidly and economically obtain knowledge about adult stage Schistosoma japonicum (Chinese strain) expressed genes using expressed sequence tag (EST) Methods A directional cDNA library constructed from Schistosoma japonicum (Chinese strain ) adult stage RNA was used to generate expressed sequence tags(ESTs) These were compared against an EMBL parasites database and GENBANK database by BLASTn and BLASTx Results A total of 314 phage clones were randomly selected for generating expressed sequence tags(ESTs) From these clones, 132 EST quality sequence were obtained Among these EST quality sequences,113 ESTs were successfully submitted to the dbEST at GenBanK A total of 7 6% of these EST quality sequences were previously identified sequence of Schistosoma japonicum, while 4 5% were putatively identified sequences of Schistosoma japonicum A total of 23 5% of these EST quality sequences were putatively identified sequence of Schistosoma mansoni or other organisms 57 6% had no matches in the database and were classified as unknown sequences Most ESTs with the putative protein identified belonged to housekeeping proteins Information about several interesting genes was found Conclusion Partial cDNA sequencing to generate expressed sequence tags (ESTs) has the potential to rapidly and economically increase our knowledge about adult stage Schistosoma japonicum(Chinese strain) expressed genes目的　运用表达序列标签 (ExpressedSequenceTag ,EST)技术快速、节约、有效地获得有关日本血吸虫 (中国大陆株 )成虫表达基因的知识。方法　随机挑取日本血吸虫 (中国大陆株 )成虫cDNA文库单个重组克隆进行部分测序以获得EST ,获得的EST通过BLAST程序同EMBL寄生虫数据库和GeneBank数据库进行比较及同源性分析。结果　本研究共随机挑取日本血吸虫 (中国大陆株 )成虫cDNA文库单个重组克隆 3 1 4个 ,获得了 1 3 2个有EST价值的序列 ,其中 1 1 3个成功在GeneBankdbEST中登录。 7 6%有EST价值的序列为日本血吸虫已知序列 ,4 5%为日本血吸虫同源序列。曼氏血吸虫或其他生物的同源序列占有EST价值的序列的 2 3 5% ,未知序列占 57 6%。通过同源性分析 ,发现了几个令人感兴趣的基因 ,另外 ,大多数同源序列具有看家基因功能。结论　EST方法具有快速、有效地获得有关日本血吸虫 (中国大陆株 )

关 键 词：Schistosoma japonicum (Chinese strain) ·   expressed sequence tags (ESTs)  ·   cDNA  library 

分 类 号：R[医药卫生]