Levels of topoisomerase II and DNA polymerase alpha are regulated independently in developing neuronal nuclei

Biochem Biophys Res Commun. 1986 Aug 14;138(3):1116-22. doi: 10.1016/s0006-291x(86)80398-9.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Age Factors
  • Animals
  • Brain / enzymology
  • Brain / growth & development
  • Cell Differentiation
  • Cell Nucleus / enzymology
  • DNA Replication
  • DNA Topoisomerases, Type II / metabolism*
  • DNA-Directed DNA Polymerase / metabolism*
  • Neurons / cytology
  • Neurons / enzymology*
  • Rats


  • DNA-Directed DNA Polymerase
  • DNA Topoisomerases, Type II