G2 chromatid damage and repair kinetics in normal human fibroblast cells exposed to low- or high-LET radiation.

Abstract:

:Radiation-induced chromosome damage can be measured in interphase using the Premature Chromosome Condensation (PCC) technique. With the introduction of a new PCC technique using the potent phosphatase inhibitor calyculin-A, chromosomes can be condensed within five minutes, and it is now possible to examine the early damage induced by radiation. Using this method, it has been shown that high-LET radiation induces a higher frequency of chromatid breaks and a much higher frequency of isochromatid breaks than low-LET radiation. The kinetics of chromatid break rejoining consists of two exponential components representing a rapid and a slow time constant, which appears to be similar for low- and high-LET radiations. However, after high-LET radiation exposures, the rejoining process for isochromatid breaks influences the repair kinetics of chromatid-type breaks, and this plays an important role in the assessment of chromatid break rejoining in the G2 phase of the cell cycle.

journal_name

Cytogenet Genome Res

authors

Kawata T,Ito H,Uno T,Saito M,Yamamoto S,Furusawa Y,Durante M,George K,Wu H,Cucinotta FA

doi

10.1159/000077491

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

211-5

issue

1-4

eissn

1424-8581

issn

1424-859X

pii

77491

journal_volume

104

pub_type

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