SPACA4基因在人和小鼠的表达及其生物信息学分析

Expression and bioinformatics analysis of SPACA4 in mice and human

目的 分析SPACA4在小鼠和人的表达特性.方法 本研究通过对小鼠SPACA4基因（mSPACA4）在4、9、18、35、54d和6月龄小鼠睾丸中的Affymetrix芯片杂交,结合RT-PCR实验和生物信息学软件,分析mSPACA4及其同源基因hSPACA4的表达特性.结果 芯片杂交结果显示,mSPACA4基因在小鼠35d睾丸中开始表达,半定量RT-PCR结果与之完全一致.RT-PCR结果还显示,mSPACA4和hSPACA4分别在8种小鼠组织和10种人组织中呈现睾丸特异性表达.生物信息学分析显示,亚细胞定位预测该基因是跨膜蛋白（34.8%）或质膜上（34.8%）表达.mSPACA4蛋白的信号肽剪切位点在第19～20个氨基酸之间,跨膜区在第2～20及101～126个氨基酸之间.结论 mSPACA4和hSPACA4均为睾丸特异性表达基因,mSPACA4特异性地在35d龄后的小鼠睾丸中表达,SPACA4具有作为男子避孕药的靶点进行研究的潜在价值.

Objective To analyze the expression of SPACA4 in human and mice. Methods Testes cDNA samples from Balb/C mice of different postnatal days were performed with mouse Affymetrix chip to screen the expression of SPACA4 in mice. Sub-quantitative RT-PCR and bioinformatic tools were used here to describe the expression profile of SPACA4 in mice and human. Results The results of gene chip analysis indicated that the expression of mSPACA4 began after 35 of postnatal testis in mice. Sub-quantitative RT-PCR assay showed that SPACA4 gene expressed exclusively in mouse and human testis, and mouse mSPACA4 gene was expressed after day 35 of postnatal testis that is consistency with the results of gene chip analysis. By bioinformatics analysis, mSPACA4 is located in cell membrane （34.8%） or plasma membrane （34.8%）, the signal peptide cleavage site between position 19 and 20 amino acids, transmembrane region between 2-20 and 101-126 amino acids, respectively, on mSPACA4 protein. Conclusion mSPACA4 and hSPACA4 were testis-specific genes, and the expression of mSPACA4 begins after day 35 of postnatal testis in mice. SPACA4 is a candidate for targeting in a sperm-based contraceptive vaccine.