Plateau distributions of DNA fragment lengths produced by extended light exposure of extranuclear photosensitizers in human cells.

Abstract:

:We have exploited properties of photosensitizers to study an aspect of the packing of chromatin in the cell nucleus. The fluorescent photosensitizers mesotetra(3-hydroxyphenyl) porphyrin and Photofrin II were both localized in the nuclear membrane and other membrane structures, but could not be found inside the nuclei. Light exposure of cells at 1 degrees C in the presence of the sensitizers induced DNA double-strand breaks. The length distributions of DNA fragments were determined by pulsed field gel electrophoresis. Because DNA damage is produced mainly via singlet oxygen diffusing less than 0.1 microns from the sensitizer, DNA double-strand breaks were supposedly produced within this distance of the nuclear membrane. Consistent with this, with prolonged illumination and with increasing concentrations of sensitizer the distribution of DNA fragment lengths reached a plateau level. In contrast, with the hydrophilic, intranuclear sensitizer meso-tetra(4-sulphonatophenyl)porphyrin, no such plateau level was found. The plateau distributions of DNA fragment lengths of different cell types had the same general shape with average fragment lengths ranging from 174 to 194 kilobasepairs. Particular genes, c-myc, fos and p53, were found on broad distributions of photocleaved fragment lengths. The results indicate that on each side of the genes the locus of the chromatin fibre situated close to the nuclear membrane, varied randomly.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Kvam E,Stokke T,Moan J,Steen HB

doi

10.1093/nar/20.24.6687

keywords:

subject

Has Abstract

pub_date

1992-12-25 00:00:00

pages

6687-93

issue

24

eissn

0305-1048

issn

1362-4962

journal_volume

20

pub_type

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