3-Methyladenine-DNA N-glycosylase (MAG) and O6-methylguanine-DNA methyltransferase (MGMT) activities were assayed in liver, lungs, brain and ovaries of female mice of two inbred stocks, C3Hf and C57BL/E, as a function of age. In addition to differences in the enzyme levels between the two stocks for each organ, the suckling animals (9-day-old) have consistently lower levels of both MAG and MGMT than young adults (7-or 8-week-old). While the MGMT levels in adults did not decrease with age, the MAG levels in 15- to 17-month-old animals were, in general, significantly lower than those in young aduts. These results raise the possibility that the older animals are at higher risk than young adults following exposure to alkylating mutagens.
- 3-Methyladenine-DNA N-glycoyslase
- DNA repir
- O-Methylguanine-DNA methyltransferase
- Tissue specificity
ASJC Scopus subject areas
- Developmental Neuroscience
- Developmental Biology