砷是广泛存在于自然环境中的有毒元素。在生物进化的过程中 ,许多生物从细菌到哺乳动物都产生了对抗砷毒的生理机制 ,而这些机制的产生往往由其遗传学基础所决定。随着分子生物学及分子遗传学的飞速发展 ,抗砷机制的研究也进入到了分子水平 ,一些抗砷基因相继被发现 ,其结构和 Arsenic is a noxious element widely found in the natural environment. In the course of biological evolution, many organisms produce bacterial and mammalian aphrodisiac physiological mechanisms that are often determined by their genetic basis. With the rapid development of molecular biology and molecular genetics, the study of anti-arsenic mechanism has also entered the molecular level, some anti-arsenic genes have been discovered, the structure and