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Lethal mutations and genomic instability

C Mothersill¹, C Seymour

¹Radiation Science Centre, Dublin Institute of Technology, Republic of Ireland.

International Journal of Radiation Biology

|June 1, 1997

Summary

Delayed cell death after radiation, termed lethal mutations, arises from early cellular repair events. This phenomenon, linked to genomic instability, may involve epigenetic changes impacting radiation risk assessment.

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Preface.

Journal of environmental radioactivity·2013

Area of Science:

Radiation Biology
Genetics
Cellular Biology

Background:

Delayed cell death in irradiated cells, termed 'lethal mutations', was first described in 1984.
This effect is observed when assessing cloning efficiency or population doubling time of cells derived from irradiated progenitors.
Lethal mutations are linked to the low-dose shoulder region of cell survival curves and fast repair processes within two hours post-irradiation.

Purpose of the Study:

To review lethal mutation data over the past decade.
To integrate this data with current understanding of radiation carcinogenesis and genomic instability.
To explore the potential epigenetic basis of lethal mutations and their implications for risk assessment.

Main Methods:

Review of accumulated lethal mutation data from the last ten years.
Analysis of data in the context of modern cellular and molecular radiation research.
Discussion of potential epigenetic or field effects in irradiated cells.

Main Results:

Lethal mutations are associated with fast repair events occurring within two hours post-irradiation.
The phenomenon is linked to the low-dose shoulder region of radiation survival curves.
A hypothesis is proposed that lethal mutations stem from a general epigenetic or field effect, increasing susceptibility to lethal mutations.

Conclusions:

Lethal mutations may be an epigenetic phenomenon affecting all irradiated cells.
This understanding necessitates re-evaluation of radiation risk estimates and therapeutic dose calculations.
Further research is needed to elucidate the mechanisms and implications of lethal mutations in radiation biology.

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