The stalling of transcription at abasic sites is highly mutagenic.
Abasic (AP) sites represent one of the most frequently formed lesions in DNA. Here, we examine the consequences of the stalling of RNA polymerase II at AP sites in DNA in Saccharomyces cerevisiae. A severe inhibition of transcription occurs in strains that are defective in the removal of AP sites and that also lack the RAD26 gene, a homolog of the human Cockayne syndrome group B (CSB) gene, and, importantly, a dramatic rise in mutagenesis is incurred in such strains. From the various observations presented here, we infer that the stalling of transcription at AP sites is highly mutagenic.
Yu
Sung-Lim
SL
Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston 77555-1061, USA.
Lee
Sung-Keun
SK
Johnson
Robert E
RE
Prakash
Louise
L
Prakash
Satya
S
D000251:Adenosine Triphosphatases; D019757:Carbon-Oxygen Lyases / Q000235:genetics / Q000378:metabolism; D004249:DNA Damage / Q000235:genetics*; D004260:DNA Repair / Q000235:genetics*; D045643:DNA Repair Enzymes; D043603:DNA-(Apurinic or Apyrimidinic Site) Lyase; D004706:Endodeoxyribonucleases / Q000235:genetics / Q000378:metabolism; D005656:Fungal Proteins / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D008741:Methyl Methanesulfonate / Q000633:toxicity; D016296:Mutagenesis; D009153:Mutagens / Q000633:toxicity; D009154:Mutation; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic
D005656:Fungal Proteins; D009153:Mutagens; C072975:RAD14 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D008741:Methyl Methanesulfonate; D004706:Endodeoxyribonucleases; C083274:Apn1 protein, S cerevisiae; D000251:Adenosine Triphosphatases; C465758:RAD26 protein, S cerevisiae; D019757:Carbon-Oxygen Lyases; D043603:DNA-(Apurinic or Apyrimidinic Site) Lyase; D045643:DNA Repair Enzymes