Abstract
Chinese hamster cells have large interstitial (TTAGGG) bands (ITs) which are unstable and should be protected by an unknown mechanism. Here, we expressed in Chinese hamster V79 cells green fluorescent protein (GFP)-tagged human TRF1, and found that a major fraction of GFP-TRF1 bound to ITs is diffusionally mobile. This fraction strongly decreases after treatment of cells with wortmannin, a protein kinase inhibitor, and this drug also increases the frequency of chromosome aberrations. Ionizing radiation does not induce detectable translocation of GFP-TRF1 to the sites of random double-strand breaks visualized using antibodies against histone γ-H2AX. TRF1 is known to be eliminated from telomeres by overexpression of tankyrase 1 which induces TRF1 poly(ADP-ribosyl)ation. We transfected V79 cells by plasmid encoding tankyrase 1 and found that the frequency of chromosome rearrangements is increased in these cells independently of their treatment by IR. Taken together, our results suggest that TRF1 is involved in sequence-specific protection of internal nontelomeric (TTAGGG)n repeats.
| Original language | English |
|---|---|
| Pages (from-to) | 6690-6698 |
| Number of pages | 9 |
| Journal | Oncogene |
| Volume | 22 |
| Issue number | 42 REV. ISS. 4 |
| Publication status | Published - Sep 29 2003 |
Fingerprint
Keywords
- Instability
- Internal telomeric repeats
- Tankyrase 1
- TRF1
- Wortmannin
ASJC Scopus subject areas
- Molecular Biology
- Cancer Research
- Genetics
Cite this
Protection of internal (TTAGGG)n repeats in Chinese hamster cells by telomeric protein TRF1. / Krutilina, Raisa Ivanovna; Smirnova, Alexandra Nikolaevna; Mudrak, Olga Stanislavovna; Pleskach, Nadezhda Mikhailovna; Svetlova, Maria Pavlovna; Oei, Shiao Li; Yau, Peter M.; Bradbury, Edwin Morton; Zalensky, Andrey Olegovich; Tomilin, Nikolai Viktorovich.
In: Oncogene, Vol. 22, No. 42 REV. ISS. 4, 29.09.2003, p. 6690-6698.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Protection of internal (TTAGGG)n repeats in Chinese hamster cells by telomeric protein TRF1
AU - Krutilina, Raisa Ivanovna
AU - Smirnova, Alexandra Nikolaevna
AU - Mudrak, Olga Stanislavovna
AU - Pleskach, Nadezhda Mikhailovna
AU - Svetlova, Maria Pavlovna
AU - Oei, Shiao Li
AU - Yau, Peter M.
AU - Bradbury, Edwin Morton
AU - Zalensky, Andrey Olegovich
AU - Tomilin, Nikolai Viktorovich
PY - 2003/9/29
Y1 - 2003/9/29
N2 - Chinese hamster cells have large interstitial (TTAGGG) bands (ITs) which are unstable and should be protected by an unknown mechanism. Here, we expressed in Chinese hamster V79 cells green fluorescent protein (GFP)-tagged human TRF1, and found that a major fraction of GFP-TRF1 bound to ITs is diffusionally mobile. This fraction strongly decreases after treatment of cells with wortmannin, a protein kinase inhibitor, and this drug also increases the frequency of chromosome aberrations. Ionizing radiation does not induce detectable translocation of GFP-TRF1 to the sites of random double-strand breaks visualized using antibodies against histone γ-H2AX. TRF1 is known to be eliminated from telomeres by overexpression of tankyrase 1 which induces TRF1 poly(ADP-ribosyl)ation. We transfected V79 cells by plasmid encoding tankyrase 1 and found that the frequency of chromosome rearrangements is increased in these cells independently of their treatment by IR. Taken together, our results suggest that TRF1 is involved in sequence-specific protection of internal nontelomeric (TTAGGG)n repeats.
AB - Chinese hamster cells have large interstitial (TTAGGG) bands (ITs) which are unstable and should be protected by an unknown mechanism. Here, we expressed in Chinese hamster V79 cells green fluorescent protein (GFP)-tagged human TRF1, and found that a major fraction of GFP-TRF1 bound to ITs is diffusionally mobile. This fraction strongly decreases after treatment of cells with wortmannin, a protein kinase inhibitor, and this drug also increases the frequency of chromosome aberrations. Ionizing radiation does not induce detectable translocation of GFP-TRF1 to the sites of random double-strand breaks visualized using antibodies against histone γ-H2AX. TRF1 is known to be eliminated from telomeres by overexpression of tankyrase 1 which induces TRF1 poly(ADP-ribosyl)ation. We transfected V79 cells by plasmid encoding tankyrase 1 and found that the frequency of chromosome rearrangements is increased in these cells independently of their treatment by IR. Taken together, our results suggest that TRF1 is involved in sequence-specific protection of internal nontelomeric (TTAGGG)n repeats.
KW - Instability
KW - Internal telomeric repeats
KW - Tankyrase 1
KW - TRF1
KW - Wortmannin
UR - http://www.scopus.com/inward/record.url?scp=0242606276&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0242606276&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0242606276
VL - 22
SP - 6690
EP - 6698
JO - Oncogene
JF - Oncogene
SN - 0950-9232
IS - 42 REV. ISS. 4
ER -