电子克隆结合RT-PCR获得两条eIF4E剪接变异体的全长cDNA

Two Novel Splicing Variants of eIF4E Obtained by Electronic Cloning Technique Combined with RT-PCR

本研究旨在克隆急性白血病复发相关的新EST片段全长cDNA并进行生物信息学分析。电子克隆结合RT-PCR克隆新EST片段的全长cDNA,利用生物信息学技术分析所获得的cDNA。结果获得全长序列为1904bp和3393bp的两条真核细胞翻译起始因子4E(eukaryotic initiation factor4E,eIF4E)新的剪接变异体,命名为真核细胞翻译起始因子剪接变异体1(splicing variant1 of eIF4E)和真核细胞翻译起始因子剪接变异体2(splicing variant 2 of eIF4E)。编码的蛋白产物分别为245和132个氨基酸。二者编码的蛋白产物与eIF4E蛋白有所不同。结论:获得了两条eIF4E剪接变异体的全长cDNA,这为进一步探讨与急性白血病复发的相关性提供基础。

In order to clone the full-length cDNA of a novel EST which is probably related to acute leukemia relapse and to analyse the sequences, the electronic cloning technique combined with RT-PCR was used to clone the full-length cDNA, and the sequences were analyzed by bioinformatics. The results showed that the two novel splicing variants of eIF4E named as splicing variant 1 and 2 of elF4E were obtained. Bioinformatics analysis showed that variant 1 and 2 exhibited 84% and 47% similarity to eIF4E mRNA, and were localized on eIF4E locus on chromosome 4. The lengths of 2 variants are 1 904 bp and 3 393 bp, encoding 245 amino acids and 132 amino acids respectively. BLAST results showed that the both variants mentioned above contains seven exons. Among them, the sequences of the three exons at 5＇ end of variant 1, variant 2 and eIF4E mRNA were different from each other. Protein BLAST showed that they are partially different from eIF4E protein. It is concluded that the two novel splicing variants of eIF4E were cloned, and their relation to acute leukemia relapse needs to be further investigated.