title: Analysis of chromatin of the brain of young and old rats by nick-translation.
abstract: Chromatin of the brain of young (22-23 week) and old (118-119 week) rats has been analysed by nick-translation reaction following its digestion by DNaseI, EcoRI, MspI and HpaII. The incorporation of (3H)-dTMP in the old is only about 50 percent of that of the young. The difference in the incorporation following digestion of nuclei by MspI and HpaII that quantitate the degree of methylation of internal cytosines in the 5' CCGG 3' sequences, is nearly two-fold higher in the old. These data indicate that the chromatin undergoes increasing condensation as a function of age. One of the contributory factors may be increasing methylation of DNA. This may decrease the active fraction of chromatin.
authors.forename: M M
authors.initials: MM
authors.lastname: Chaturvedi
authors.forename: M S
authors.initials: MS
authors.lastname: Kanungo
mesh_terms: D000375:Aging; D000818:Animals; D001923:Brain Chemistry; D002843:Chromatin / Q000032:analysis*; D004262:DNA Restriction Enzymes; D015246:Deoxyribonuclease EcoRI; D019003:Deoxyribonuclease HpaII; D003850:Deoxyribonuclease I; D008297:Male; D008745:Methylation; D009690:Nucleic Acid Conformation; D014176:Protein Biosynthesis; D011487:Protein Conformation; D051381:Rats
chemical_list: D002843:Chromatin; D004262:DNA Restriction Enzymes; D015246:Deoxyribonuclease EcoRI; D019003:Deoxyribonuclease HpaII; D003850:Deoxyribonuclease I