当前,关于生物衰老的机制还不甚明了。但事实说明,除了环境因素,生物的内在遗传因素在衰老及生物的最高寿命上也起着重要作用。目前认为衰老起源于DNA的学说大致可归纳为以下几方面:一种观点是生命过程中DNA损伤及修复的错误(即引起突变)是致衰老的主要原因,DNA损伤及突变的积累将使细胞功能丧失,最终导致细胞死亡;另一种观点是衰老与分化相似,系由早已安排好的遗传程序控制,生物生长到成年期后,由于基因 At present, the mechanism of biological aging is not clear. But facts show that, in addition to environmental factors, the biological inherent genetic factors in aging and life expectancy also plays an important role. At present, the theory that senescence originates from DNA can be summarized as follows: One view is that DNA damage and repair errors (ie mutations) in life are the main causes of aging. The accumulation of DNA damage and mutation will make cells Loss of function, eventually leading to cell death; the other view is that aging and differentiation similar to the genetic program already arranged by the control of biological growth to adulthood, the gene