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- W2101185169 abstract "Abstract BRCA1 is a tumor suppressor that functions in controlling cell growth and maintaining genomic stability. BRCA1 has also been implicated in telomere maintenance through its ability to regulate the transcription of hTERT, the catalytic subunit of telomerase, resulting in telomere shortening, and to colocalize with the telomere‐binding protein TRF1. The high incidence of nonreciprocal translocations in tumors arising from BRCA1 mutation carriers and Brca1 ‐null mice also raises the possibility that BRCA1 plays a role in telomere protection. To date, however, the consequences for telomere status of disrupting BRCA1 have not been reported. To examine the role of BRCA1 in telomere regulation, we have expressed a dominant‐negative mutant of BRCA1 (tr BRCA1 ), known to disrupt multiple functions of BRCA1, in telomerase‐positive mammary epithelial cells (SVCT) and telomerase‐negative ALT cells (GM847). In SVCT cells, expression of tr BRCA1 resulted in an increased incidence of anaphase bridges and in an increase in telomere length, but no change in telomerase activity. In GM847 cells, tr BRCA1 also increased anaphase bridge formation but did not induce any change in telomere length. BRCA1 colocalized with TRF2 in telomerase‐positive cells and with a small subset of ALT‐associated PML bodies (APBs) in ALT cells. Together, these results raise the possibility that BRCA1 could play a role in telomere protection and suggest a potential mechanism for one of the phenotypes of BRCA1‐deficient cells. © 2005 Wiley‐Liss, Inc." @default.
- W2101185169 created "2016-06-24" @default.
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- W2101185169 date "2005-11-10" @default.
- W2101185169 modified "2023-10-17" @default.
- W2101185169 title "Disruption of BRCA1 function results in telomere lengthening and increased anaphase bridge formation in immortalized cell lines" @default.
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- W2101185169 doi "https://doi.org/10.1002/gcc.20290" @default.
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