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Vol. 104, No. 1-4, 2004
Issue release date: 2004
Section title: Basic Aspects
Cytogenet Genome Res 104:87–94 (2004)
(DOI:10.1159/000077470)

Human fibroblasts expressing hTERT show remarkable karyotype stability even after exposure to ionizing radiation

Pirzio L.M. · Freulet-Marrière M.-A. · Bai Y. · Fouladi B. · Murnane J.P. · Sabatier L. · Desmaze C.
aCEA-DSV/DRR/LRO, 92265 Fontenay aux roses (France); bDepartment of Radiation Oncology, University of California, San Francisco, CA (USA)

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Article / Publication Details

First-Page Preview
Abstract of Basic Aspects

Received: 9/26/2003
Accepted: 11/26/2003
Published online: 6/15/2004

Number of Print Pages: 8
Number of Figures: 1
Number of Tables: 3

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR

Abstract

Ectopic expression of telomerase results in an immortal phenotype in various types of normal cells, including primary human fibroblasts. In addition to its role in telomere lengthening, telomerase has now been found to have various functions, including the control of DNA repair, chromatin modification, and the control of expression of genes involved in cell cycle regulation. The investigations on the long-term effects of telomerase expression in normal human fibroblast highlighted that these cells show low frequencies of chromosomal aberrations. In this paper, we describe the karyotypic stability of human fibroblasts immortalized by expression of hTERT. The ectopic overexpression of telomerase is associated with unusual spontaneous as well as radiation-induced chromosome stability. In addition, we found that irradiation did not enhance plasmid integration in cells expressing hTERT, as has been reported for other cell types. Long-term studies illustrated that human fibroblasts immortalized by telomerase show an unusual stability for chromosomes and for plasmid integration sites, both with and without exposure to ionizing radiation. These results confirm a role for telomerase in genome stabilisation by a telomere-independent mechanism and point to the possibility for utilizing hTERT-immortalized normal human cells for the study of gene targeting.   


Article / Publication Details

First-Page Preview
Abstract of Basic Aspects

Received: 9/26/2003
Accepted: 11/26/2003
Published online: 6/15/2004

Number of Print Pages: 8
Number of Figures: 1
Number of Tables: 3

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR


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