Abstract:
:The linear chromosomes of vertebrates terminate in telomeres that consist of a tandemly repeated hexameric sequence, 5'TTAGGG3'. Telomeres form a protective loop structure (t-loop), which is thought to prevent them from being recognized as a double-strand break. Approximately 10% of human tumors prevent shortening of their telomeres by using a recombination-mediated alternative lengthening of telomeres (ALT) mechanism. ALT-positive human cells contain extrachromosomal telomere repeat (ECTR) DNA that may either be circular or linear. It has been proposed that ECTR may be generated by recombination events involving the t-loop. A proportion of the cells within ALT-positive cell populations contain promyelocytic leukemia (PML) nuclear bodies that contain telomeric DNA and telomere-binding proteins that are called ALT-associated PML bodies (APB). Although the presence of APBs is very useful for determining whether tumors and cell lines use the ALT mechanism, the function of APBs is unknown. It has previously been shown that telomeric DNA is particularly susceptible to damage by hydrogen peroxide and N-methyl-N'-nitro-N-nitrosoguanidine. We report here that these DNA-damaging agents induce both linear and circular ECTR DNA in ALT cells and increase the proportion of cells that contain APBs. We partially purified APBs and showed that the telomeric repeat DNA they contain is predominantly linear. We propose that a function of APBs is to sequester linear telomeric DNA.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Fasching CL,Neumann AA,Muntoni A,Yeager TR,Reddel RRdoi
10.1158/0008-5472.CAN-07-1556subject
Has Abstractpub_date
2007-08-01 00:00:00pages
7072-7issue
15eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-07-1556journal_volume
67pub_type
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