V(D)J recombination in ataxia telangiectasia, Bloom's syndrome, and a DNA ligase I-associated immunodeficiency disorder - PubMed (original) (raw)
. 1993 Sep 25;268(27):20105-9.
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- PMID: 8397200
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V(D)J recombination in ataxia telangiectasia, Bloom's syndrome, and a DNA ligase I-associated immunodeficiency disorder
C L Hsieh et al. J Biol Chem. 1993.
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Abstract
Ataxia telangiectasia (AT) and Bloom's syndrome (BS) patients are characterized by sensitivity to radiation, increased lymphoid malignancy, and frequent translocations to the antigen receptor loci. Because of these features, there has been a persistent question as to whether the V(D)J recombinase might be abnormal in cells from these patients. Such abnormalities might be due to inappropriate to inaccurate expression of components of the V(D)J recombinase or due to mutation in a component shared between V(D)J recombination and other cellular processes, such as DNA repair. Bloom's syndrome is associated with a ligation deficiency, and this activity may contribute in the end resolution steps of both site-specific and general DNA-processing reactions. In the current study, we have activated V(D)J recombination in normal, AT, and BS fibroblasts and in fibroblasts from a patient with mutations that largely abolish DNA ligase I activity. We find that the signal and coding joint formation of the V(D)J recombination reaction are entirely normal in AT, BS, and DNA ligase I mutant cells. In addition to ruling out abnormalities of the V(D)J recombinase in AT, BS, and DNA ligase I mutant cells, these studies suggest that DNA ligase I is unlikely to be required for signal or coding end joining in the V(D)J recombination reaction.
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