Role of telomerase in cell senescence and oncogenesis

Virginia Urquidi, David Tarin, Steve Goodison

Research output: Contribution to journalReview articlepeer-review

102 Scopus citations


The ends of linear chromosomes are capped by specialized nucleoprotein structures termed telomeres. Telomeres comprise tracts of noncoding hexanucleotide repeat sequences that, in combination with specific proteins, protect against degradation, rearrangement, and chromosomal fusion events. Due to the polarity of conventional DNA synthesis, a net loss of telomeric sequences occurs at each cell division. It has been proposed that this cumulative telomeric erosion is a limiting factor in replicative capacity and elicits a signal for the onset of cellular senescence. To proliferate beyond the senescent checkpoint, cells must restore telomere length. This can be achieved by telomerase, an enzyme with reverse-transcriptase activity. This enzyme is absent in differentiated somatic tissues, but telomerase reactivation has been detected in most tumors. Much investigative effort is focusing on telomere dynamics with a view to possible manipulation of cellular proliferative potential. In this article, we review the role of telomeres and telomerase in senescence and tumor progression, and we discuss the potential use of telomerase in diagnosis and treatment.

Original languageEnglish (US)
Pages (from-to)65-79
Number of pages15
JournalAnnual Review of Medicine
StatePublished - 2000


  • Immortality
  • Replicative lifespan
  • Reverse transcriptase
  • Therapeutic target
  • Tumor marker

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology


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