Cell cycle-dependent recruitment of telomerase RNA and Cajal bodies to human telomeres

被引:151
作者
Jády, BE
Richard, P
Bertrand, E
Kiss, T
机构
[1] CNRS, UMR 5099, Lab Biol Mol Eucaryote, F-31062 Toulouse, France
[2] Inst Genet Mol, F-34000 Montpellier, France
[3] Hungarian Acad Sci, Biol Res Ctr, H-6701 Szeged, Hungary
关键词
D O I
10.1091/mbc.E05-09-0904
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Telomerase is a ribonucleoprotein enzyme that counteracts replicative telomere erosion by adding telomeric sequence repeats onto chromosome ends. Despite its well-established role in telomere synthesis, telomerase has not yet been detected at telomeres. The RNA component of human telomerase (hTR) resides in the nucleoplasmic Cajal bodies (CBs) of interphase cancer cells. Here, in situ hybridization demonstrates that in human HeLa and Hep2 S phase cells, besides accumulating in CBs, hTR specifically concentrates at a few telomeres that also accumulate the TRF1 and TRF2 telomere marker proteins. Surprisingly, telomeres accumulating hTR exhibit a great accessibility for in situ oligonucleotide hybridization without chromatin denaturation, suggesting that they represent a structurally distinct, minor subset of HeLa telomeres. Moreover, we demonstrate that more than 25% of telomeres accumulating hTR colocalize with CBs. Time-lapse fluorescence microscopy demonstrates that CBs moving in the nucleoplasm of S phase cells transiently associate for 10-40 min with telomeres. Our data raise the intriguing possibility that CBs may deliver hTR to telomeres and/or may function in other aspects of telomere maintenance.
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收藏
页码:944 / 954
页数:11
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