Kinetic analysis of double-strand break rejoining reveals the DNA reparability of γ-irradiated tobacco cultured cells

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Abstract

The rejoining efficiency of double-strand breaks (DSBs) was quantified by a DNA fragment-size analysis in tobacco protoplasts and CHO-K1 cells following γ-ray irradiation in order to compare DNA reparability of higher plants with mammals. Results showed that the DSB rejoining efficiency of tobacco protoplasts is dependent on the temperature of post-irradiation cultivation and that it reaches a maximum at 27°C, which represents the most suitable temperature for protoplast cultivation. The DSB rejoining kinetics of tobacco protoplasts were well represented by a biphasic-exponential equation: half of initial- induced DSBs were rejoined for 1 h and the others were almost rejoined within 4 h. We found that the DSB rejoining kinetics of tobacco protoplasts at 27°C are the same as those of CHO-K1 cells at 37°C. These findings indicate that the DSB rejoining efficiency of tobacco protoplasts and CHO-K1 cells are comparable at their respective cell cultivation temperatures, suggesting that DSB rejoining efficiency is little responsible for the higher radiation-tolerance of tobacco protoplasts.

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Yokota, Y., Wada, S., Hase, Y., Funayama, T., Kobayashi, Y., Narumi, I., & Tanaka, A. (2009). Kinetic analysis of double-strand break rejoining reveals the DNA reparability of γ-irradiated tobacco cultured cells. Journal of Radiation Research, 50(2), 171–175. https://doi.org/10.1269/jrr.08064

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