Delayed numerical chromosome aberrations in human fibroblasts by low dose of radiation

Yoon Hee Cho, Su Young Kim, Hae Dong Woo, Yang Jee Kim, Sung Whan Ha, Hai Won Chung

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Radiation-induced genomic instability refers to a type of damage transmitted over many generations following irradiation. This delayed impact of radiation exposure may pose a high risk to human health and increases concern over the dose limit of radiation exposure for both the public and radiation workers. Therefore, the development of additional biomarkers is still needed for the detection of delayed responses following low doses of radiation exposure. In this study, we examined the effect of X-irradiation on delayed induction of numerical chromosomal aberrations in normal human fibroblasts irradiated with 20, 50 and 100 cGy of X-rays using the micronucleus-centromere assay. Frequencies of centromere negative- and positive-micronuclei, and aneuploidy of chromosome 1 and 4 were analyzed in the surviving cells at 28, 88 and 240 h after X-irradiation. X-irradiation increased the frequency of micronuclei (MN) in a dose-dependent manner in the cells at all measured time-points, but no significant differences in MN frequency among cell passages were observed. Aneuploid frequency of chromosomes 1 and 4 increased with radiation doses, and a significantly higher frequency of aneuploidy was observed in the surviving cells analyzed at 240 h compared to 28 h. These results indicate that low-dose of X-irradiation can induce delayed aneuploidy of chromosomes 1 and 4 in normal fibroblasts.

Original languageEnglish
Pages (from-to)15162-15172
Number of pages11
JournalInternational Journal of Environmental Research and Public Health
Issue number12
StatePublished - Dec 1 2015


  • Aneuploidy
  • Micronuclei
  • Micronucleus-centromere assay
  • Radiation-induced genomic instability
  • X-irradiation


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