[Effect of rearing conditions on nucleic acid synthesis in the brain of rats of different genotypes].

The incorporation of [3H]thymidine into DNA and of [14C]uridine into RNA has been investigated in different areas of brain and in liver of inbred August rats, non-inbred Wistar rats and hybrids between male wild-type and female Wistar rats which were kept either under normal conditions or under intensive sensory stimulation at different age. DNA metabolism has been found to display tissue, regional, age-dependent and interlinear differences. Sensory stimulation influences considerably the synthesis of nucleic acids which is maximal at early ontogenesis stages and in the brain of hybrid animals.