DNA polymerase β interacts with TRF2 and induces telomere dysfunction in a murine mammary cell line

Poppy Fotiadou, Octavian Henegariu, Joann B. Sweasy

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

DNA polymerase β (Polβ) is a DNA repair protein that functions in base excision repair and meiosis. The enzyme has deoxyribose phosphate lyase and polymerase activity, but it is error prone because it bears no proofreading activity. Errors in DNA repair can lead to the accumulation of mutations and consequently to tumorigenesis. Polβ expression has been found to be higher in tumors, and deregulation of its expression has been found to induce chromosomal instability, a hallmark of tumorigenesis, but the underlying mechanisms are unclear. In the present study, we have investigated whether ectopic expression of Polβ influences the stability of chromosomes in a murine mammary cell line. The results demonstrate a telomere dysfunction phenotype: an increased rate of telomere loss and chromosome fusion, suggesting that ectopic expression of Polβ leads to telomere dysfunction. In addition, Polβ interacts with TRF2, a telomeric DNA binding protein. Colocalization of the two proteins occurs at nontelomeric sites and appears to be influenced by the change in the status of the telomeric complex.

Original languageEnglish (US)
Pages (from-to)3830-3837
Number of pages8
JournalCancer Research
Volume64
Issue number11
DOIs
StatePublished - Jun 1 2004
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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