应用细菌双杂交系统技术寻找与人PCIA1基因相互作用的基因

目的探寻与新近发现的人类交叉免疫反应抗原（homo sapiens cross-immune reaction antigen）基因PCIA1相互作用的基因,为其功能研究提供线索。方法应用Stratagene公司的细菌双杂交系统和人胚肾cDNA文库,构建诱饵质粒pBT-PCIA1,与靶质粒pTRG-cDNA文库大规模地共转化报告菌株,筛选并分离具有相互作用的pTRG-cDNA阳性克隆,经DNA序列分析和生物信息学确定靶基因。结果发现7种靶蛋白基因,其中3种基因功能尚不清楚,其余4种具有重要生理功能,突变或表达异常都会导致严重疾病;α-辅肌动蛋白-4（actinin,alpha4,ACTN4）、鞘脂激活蛋白原（prosaposin,PSAP）或真核翻译起始因子（eukary-otic translation initiation factor 3,subunit 10 theta,EIF3S10）过表达都会促进肿瘤发生和演进。结论细菌双杂交系统技术探测蛋白质之间的相互作用,是一种提供新基因功能研究信息的有效方法;PCIA1基因表达与肿瘤形成、侵袭和转移密切相关。

Searching for genes interacting with human PCIA1 gene by using the bacterial two-hybrid system

OBJECTIVE: To search for the genes which could interact with newly found homo sapiens cross-immune reaction antigen (PCIA1) gene and accordingly to provide insights into the study of the gene function. METHODS: The Stratagene's BacterioMatch Two-Hybrid System and BacterioMatch Fetal Kidney Library were adopted and the recombinant bait plasmid pBT-PCIA1 was cotransformated with the target plasmid pTRG-cDNA library DNA into the reporter stain. After screening and isolation of positive pTRG clones, the target genes were identified by DNA sequencing and bioinformation analysis. RESULTS: Among all the seven detected target genes, three genes' function were not known, the other four genes had important functions. Their mutations or abberant expression resulted in severe diseases and overexpression of ACTN4 (actinin, alpha 4), PSAP (prosaposin) or EIF3S10 (eukaryotic translation initiation factor 3, subunit 10 theta) could promote tumor development and progression. CONCLUSION: The bacterial two-hybrid system technique is an efficient method, which can provides insights into the study of novel genes' function by detecting protein-protein interactions. This study indicates that PCIA1 gene expression correlates with tumor formation, invasion and metastasis.