Ionizing radiation induces frequent translocations with delayed replication and condensation

Kevin S. Breger, Leslie Smith, Mitchell Turker, Mathew (Matt) Thayer

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Certain chromosome rearrangements display a significant delay in replication timing that is associated with a delay in mitotic chromosome condensation. Chromosomes with delay in replication timing/delay in mitotic chromosome condensation participate in frequent secondary rearrangements, indicating that cells with delay in replication timing/delay in mitotic chromosome condensation display chromosomal instability. In this report, we show that exposing cell lines or primary blood lymphocytes to ionizing radiation results in chromosomes with the delay in replication timing/delay in mitotic chromosome condensation phenotype, and that the delay in replication timing/delay in mitotic chromosome condensation phenotype occurs predominantly on chromosome translocations. In addition, exposing mice to ionizing radiation also induces cells with delay in replication timing/delay in mitotic chromosome condensation chromosomes that persist for as long as 2 years. Cells containing delay in replication timing/delay in mitotic chromosome condensation chromosomes frequently display hyperdiploid karyotypes, indicating that delay in replication timing/delay in mitotic chromosome condensation is associated with aneuploidy. Finally, using a chromosome engineering strategy, we show that only a subset of chromosome translocations displays delay in replication timing/delay in mitotic chromosome condensation. Our results indicate that specific chromosome rearrangements result in the generation of the delay in replication timing/delay in mitotic chromosome condensation phenotype and that this phenotype occurs frequently in cells exposed to ionizing radiation both in vitro and in vivo.

Original languageEnglish (US)
Pages (from-to)8231-8238
Number of pages8
JournalCancer Research
Volume64
Issue number22
DOIs
StatePublished - Nov 15 2004

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Ionizing Radiation
Chromosomes
Phenotype
Chromosomal Instability
Polyploidy
Aneuploidy
Karyotype

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Ionizing radiation induces frequent translocations with delayed replication and condensation. / Breger, Kevin S.; Smith, Leslie; Turker, Mitchell; Thayer, Mathew (Matt).

In: Cancer Research, Vol. 64, No. 22, 15.11.2004, p. 8231-8238.

Research output: Contribution to journalArticle

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