Human Genetics

, Volume 123, Issue 5, pp 485–493

Evidence for significant heritability of apoptotic and cell cycle responses to ionising radiation

Authors

  • Paul Finnon
    • Radiation Protection Division, Health Protection AgencyCentre for Radiation, Chemical and Environmental Hazards
  • Naomi Robertson
    • Radiation Protection Division, Health Protection AgencyCentre for Radiation, Chemical and Environmental Hazards
  • Sylwia Dziwura
    • Radiation Protection Division, Health Protection AgencyCentre for Radiation, Chemical and Environmental Hazards
  • Claudine Raffy
    • Radiation Protection Division, Health Protection AgencyCentre for Radiation, Chemical and Environmental Hazards
  • Wei Zhang
    • Radiation Protection Division, Health Protection AgencyCentre for Radiation, Chemical and Environmental Hazards
  • Liz Ainsbury
    • Radiation Protection Division, Health Protection AgencyCentre for Radiation, Chemical and Environmental Hazards
  • Jaakko Kaprio
    • Department of Public HealthUniversity of Helsinki
    • Department of Mental Health and Alcohol ResearchNational Public Health Institute
  • Christophe Badie
    • Radiation Protection Division, Health Protection AgencyCentre for Radiation, Chemical and Environmental Hazards
    • Radiation Protection Division, Health Protection AgencyCentre for Radiation, Chemical and Environmental Hazards
Original Investigation

DOI: 10.1007/s00439-008-0500-1

Cite this article as:
Finnon, P., Robertson, N., Dziwura, S. et al. Hum Genet (2008) 123: 485. doi:10.1007/s00439-008-0500-1

Abstract

Genetic factors are likely to affect individual cancer risk, but few quantitative estimates of heritability are available. Public health radiation protection policies do not in general take this potentially important source of variation in risk into account. Two surrogate cellular assays that relate to cancer susceptibility have been developed to gain an insight into the role of genetics in determining individual variation in radiosensitivity. These flow cytometric assays for apoptosis induction and cell cycle delay following radiation are sufficiently sensitive to distinguish lymphocytes from a healthy donor population from those of a sample of obligate carriers of ATM mutations (P = 0.01 and P = 0.02, respectively). Analysis of 54 unselected twin pairs (38 dizygotic, 16 monozygotic) indicated much greater intrapair correlation in response in monozygotic than in dizygotic pairs. Structural equation modelling indicated that models including unique environmental factors only fitted the data less well than those incorporating two or more of additive genetic factors, common environmental factors and unique environmental factors. A model incorporating additive genetic factors and unique environmental factors yielded estimates of heritability for the two traits of 68% (95% CI 40–82%, cell cycle) and 59% (95% CI 22–79%, apoptosis). Thus, these data suggest that genetic factors contribute significantly to human variation in these two measures of radiosensitivity that relate to cancer susceptibility.

Copyright information

© Springer-Verlag 2008