alexa Reverse chemical mutagenesis: identification of the mutagenic lesions resulting from reactive oxygen species-mediated damage to DNA.


Chemotherapy: Open Access

Author(s): D I Feig, L C Sowers, L A Loeb

Abstract Share this page

An understanding of the contribution of reactive oxygen species to mutagenesis has been hampered by the vast number of different chemical modifications they cause in DNA. Even though many of these DNA alterations have been catalogued, the identification of specific lesions that cause mutations has depended on testing one modification at a time. In this study we present another approach to identify key mutagenic lesions from a pool of oxidatively modified nucleotides. dCTP was treated with an oxygen radical-generating system containing FeSO4, H2O2, and ascorbic acid. The modification products were separated by reverse-phase and anion-exchange HPLC and then incorporated by human immunodeficiency virus reverse transcriptase into a DNA that contains a target gene for scoring for mutations. One of the mutagenic species isolated was identified as 5-hydroxy-2'-deoxycytidine. It is incorporated efficiently into DNA and causes C-->T transitions in Escherichia coli at a frequency of 2.5%, which is more mutagenic than any previously identified oxidative DNA lesion.

  • To read the full article Visit
  • Open Access
This article was published in Proc Natl Acad Sci U S A. and referenced in Chemotherapy: Open Access

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version