Levels of topoisomerase II and DNA polymerase alpha are regulated independently in developing neuronal nuclei
Tsutsui, K.; Tsutsui, K.; Sakurai, H.; Shohmori, T.; Oda, T.
Biochemical and Biophysical Research Communications 138(3): 1116-1122
1986
ISSN/ISBN: 0006-291X PMID: 3019334 Document Number: 276735
A possible correlation between activity levels of topoisomerase II and DNA polymerase .alpha. was studied in neuronal nuclei from developing rat brain. A high level of canonical topoisomerase II activity was detected in neuronal nuclei throughout the development even at a late stage (28 days after birth) when the activity of DNA polymerase .alpha. decreased to less than 2% of the fetal level. Thus, in contrast to other systems, topoisomerase II does not change in parallel with DNA polymerase .alpha. during neuronal development. Our results suggest that topoisomerase II is required to maintain some fundamental processes in differentiated cells, including transcription.