Abstract:
:The activation of a telomere maintenance mechanism is required for cancer development in humans. While most tumors achieve this by expressing the enzyme telomerase, a fraction (5-15%) employs a recombination-based mechanism termed alternative lengthening of telomeres (ALT). Here we show that loss of the single-stranded DNA-binding protein replication protein A (RPA) in human ALT cells, but not in telomerase-positive cells, causes increased exposure of single-stranded G-rich telomeric DNA, cell cycle arrest in G2/M phase, accumulation of single-stranded telomeric DNA within ALT-associated PML bodies (APBs), and formation of telomeric aggregates at the ends of metaphase chromosomes. This study demonstrates differences between ALT cells and telomerase-positive cells in the requirement for RPA in telomere processing and implicates the ALT mechanism in tumor cells as a possible therapeutic target.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Grudic A,Jul-Larsen A,Haring SJ,Wold MS,Lønning PE,Bjerkvig R,Bøe SOdoi
10.1093/nar/gkm738subject
Has Abstractpub_date
2007-01-01 00:00:00pages
7267-78issue
21eissn
0305-1048issn
1362-4962pii
gkm738journal_volume
35pub_type
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