[Mechanisms and age-specific characteristics of nuclear DNA replication].

Replication mechanisms of nuclear DNA in eucaryotic cells and their changes with the organism aging are discussed. Tge polyrepliconic nature of replicating DNA, discontinuous synthesis of its newly formed chains, enzymic apparatus of replication and regulation of this process are described. Special attention is paid to destabilization of the secondary structure of the replicating molecule. In aging, changes in the DNA replication were found at each level of its regulation, i.e. at synthesis precursors, enzymic replication complex and replicating DNA structure. This may be an indication of the altered regulation of the DNA replication with aging.