Advertisement

Watch out for the neighbors

Radiation induces DNA breaks, leading to chromosomal rearrangements. But do the breaks come first, followed by a wandering through the nucleus to find a suitable partner for the free DNA end? Or is the partner already nearby at the time of the break? In the 6 October Science, Nikiforova et al. provide evidence for the latter theory (Science 2000, 290:138-141). They look at papillary thyroid cancer, in which a radiation-induced inversion often fuses the genes for H4 and the RET receptor tyrosine

By | October 10, 2000

Radiation induces DNA breaks, leading to chromosomal rearrangements. But do the breaks come first, followed by a wandering through the nucleus to find a suitable partner for the free DNA end? Or is the partner already nearby at the time of the break? In the 6 October Science, Nikiforova et al. provide evidence for the latter theory (Science 2000, 290:138-141). They look at papillary thyroid cancer, in which a radiation-induced inversion often fuses the genes for H4 and the RET receptor tyrosine kinase. In normal thyroid cells the genetic distance between these two genes is 30 Mb, but Nikiforova et al. find that in 35% of thyroid cells the genes are physically very close together. The restriction of the RET-H4 rearrangement to thyroid cancers (and not lymphomas or breast cancers) may have two different explanations. Lymphocytes, at least in mice, are not transformed by activated RET, and mammary epithelial cells do not show association of the RET and H4 genes.

Advertisement
Advertisement

Popular Now

  1. Antibody Maker Loses License Over Animal Welfare Violations
  2. ORI: Researcher Faked Dozens of Experiments
    The Nutshell ORI: Researcher Faked Dozens of Experiments

    A former scientist at the University of Michigan and the University of Chicago made up more than 70 experiments on heart cells, according to the Office of Research Integrity.

  3. Immune Defect Detected in Knockout Mice
  4. Exploring Emotional Contagion
Advertisement
LabX
LabX
Advertisement
Biosearch Technologies
illumina Corporate
illumina Corporate