摘要： 新基因全长cDNA序列的获得常常是分子生物学工作者面临的难题。人类基因组计划及其相关计划的实施导致了大量表达序列标签(EST)的产生。利用一定的生物信息学算法，这些EST序列往往可用来对新基因片段进行延伸。采用Linux操作系统，利用Blast软件和Phrap软件以及EST数据库在微机上构建了EST序列的电子延伸系统，并对来自于人胎肝的11386条EST序列和511条插入片段全长cDNA序列进行了电子延伸，结果显示8373条EST序列和389条插入片段全长cDNA序列得到了程度不等的延伸，部分结果通过RACE实验得到证实。该套系统可高效地、规模化进行EST序列的延伸，可为通过实验获得新基因全长cDNA序列提供重要线索。
Abstract:Normally it is difficult to obtain full-length cDNA sequence of novel genes.More and more expressed sequence tags(ESTs) have been obtained since the start-up of human genome project.Powerful system is badly needed for data mining on these EST sequences.Based on a personal computer coupled with Linux operating system and EST database,the Blast software and Phrap software were used to construct a platform for in silico elongation of ESTs in our lab.The performance was tested using 11386 EST sequences and 511 partial-length cDNA sequences.Results demonstrated that 8373 EST and 389 cDNA sequence were elongated using this system.Thus the platform seems to be a fast way for full-length cDNA sequence cloning of new genes.