Journal
EMBO JOURNAL
Volume 26, Issue 23, Pages 4867-4878Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.emboj.7601903
Keywords
cohesins; sister chromatids; tankyrase 1; telomeres; TRF1
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Funding
- NCI NIH HHS [T32 CA009161, CA09161, R01 CA095099, R01 CA95099, R01 CA116352] Funding Source: Medline
- NIGMS NIH HHS [GM07238, T32 GM007238] Funding Source: Medline
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Previous studies in human cells indicate that sister telomeres have distinct requirements for their separation at mitosis. In cells depleted for tankyrase 1, a telomeric poly(ADP- ribose) polymerase, sister chromatid arms and centromeres separate normally, but telomeres remain associated and cells arrest in mitosis. Here, we use biochemical and genetic approaches to identify proteins that might mediate the persistent association at sister telomeres. We use immunoprecipitation analysis to show that the telomeric proteins, TRF1 (an acceptor of PARsylation by tankyrase 1) and TIN2 (a TRF1 binding partner) each bind to the SA1 ortholog of the cohesin Scc3 subunit. Sucrose gradient sedimentation shows that TRF1 cosediments with the SA1 - cohesin complex. Depletion of the SA1 cohesin subunit or the telomeric proteins (TRF1 and TIN2) restores the normal resolution of sister telomeres in mitosis in tankyrase 1- depleted cells. Moreover, depletion of TRF1 and TIN2 or SA1 abrogates the requirement for tankyrase 1 in mitotic progression. Our studies indicate that sister telomere association in human cells is mediated by a novel association between a cohesin subunit and components of telomeric chromatin.
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