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Phosphorylation of H2AX histones in response to double-strand breaks and induction of premature chromatin condensation in hydroxyurea-treated root meristem cells of Raphanus sativus, Vicia faba, and Allium porrum

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Summary.

Histone H2A variant H2AX is rapidly phosphorylated on the induction of DNA double-strand breaks by ionizing radiation and hydroxyurea-mediated replication arrest, resulting in the formation of γ-H2AX foci along megabase chromatin domains nearby the sites of incurred DNA damage. In an attempt to establish a relationship between species-specific nuclear architecture and H2AX phosphorylation in S/G2 phase-arrested root meristem cells, immunocytochemical comparisons using an antibody raised against human γ-H2AX were made among three plants differing with respect to DNA contents: Allium porrum, representing a reticulate type of DNA package, Vicia faba, having semireticulate cell nuclei, and Raphanus sativus, characterised by a chromocentric type of chromatin. Another approach was aimed at determining possible correlations between the extent of hydroxyurea-induced phosphorylation of H2AX histones and the quantities of root meristem cells induced by caffeine to enter aberrant mitotic division (premature chromosome condensation). It was concluded that the higher-order structure of chromatin may contribute to the accessibility of molecular factors engaged in the recognition and repair of genetic lesions. Consequently, in contrast to A. porrum and V. faba, a diffuse chromatin in chromocentric cell nuclei of R. sativus may become more vulnerable both to generate DNA double-strand breaks and to recruit molecular elements needed to arrange the cell cycle checkpoint functions, and thus, more resistant to factors which allow the cells to enter premature chromosome condensation spontaneously. On the other hand, however, caffeine-mediated overriding of the S-M checkpoint control system resulted in the typical appearance of premature chromosome condensation, irrespective of the genomic content of DNA.

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Abbreviations

DSB:

double-strand breaks

HU:

hydroxyurea

PCC:

premature chromosome condensation

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Correspondence to Dorota Rybaczek.

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Correspondence and reprints: Department of Cytophysiology, University of Łódź, Pilarskiego 14, 90-231 Łódź, Poland.

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Rybaczek, D., Maszewski, J. Phosphorylation of H2AX histones in response to double-strand breaks and induction of premature chromatin condensation in hydroxyurea-treated root meristem cells of Raphanus sativus, Vicia faba, and Allium porrum . Protoplasma 230, 31–39 (2007). https://doi.org/10.1007/s00709-006-0192-0

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