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J Exp Med. 2010 Jul 5;207(7):1369-80. doi: 10.1084/jem.20100285. Epub 2010 Jun 21.

ATM-deficient thymic lymphoma is associated with aberrant tcrd rearrangement and gene amplification.

Author information

1
Howard Hughes Medical Institute, Children's Hospital, Immune Disease Institute, and Harvard Medical School, Boston, MA 02115, USA. sz2296@columbia.edu

Abstract

Ataxia telangiectasia mutated (ATM) deficiency predisposes humans and mice to T lineage lymphomas with recurrent chromosome 14 translocations involving the T cell receptor alpha/delta (Tcra/d) locus. Such translocations have been thought to result from aberrant repair of DNA double-strand breaks (DSBs) during Tcra locus V(D)J recombination, and to require the Tcra enhancer (Ealpha) for Tcra rearrangement or expression of the translocated oncogene. We now show that, in addition to the known chromosome 14 translocation, ATM-deficient mouse thymic lymphomas routinely contain a centromeric fragment of chromosome 14 that spans up to the 5' boundary of the Tcra/d locus, at which position a 500-kb or larger region centromeric to Tcra/d is routinely amplified. In addition, they routinely contain a large deletion of the telomeric end of one copy of chromosome 12. In contrast to prior expectations, the recurrent translocations and amplifications involve V(D)J recombination-initiated breaks in the Tcrd locus, as opposed to the Tcra locus, and arise independently of the Ealpha. Overall, our studies reveal previously unexpected mechanisms that contribute to the oncogenic transformation of ATM-deficient T lineage cells.

PMID:
20566716
PMCID:
PMC2901073
DOI:
10.1084/jem.20100285
[Indexed for MEDLINE]
Free PMC Article

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