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Research Article

V(D)J recombination: evidence that a replicative mechanism is not required.

C L Hsieh, R P McCloskey, E Radany, M R Lieber
C L Hsieh
Department of Pathology, Stanford University School of Medicine, California 94305-5324.
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R P McCloskey
Department of Pathology, Stanford University School of Medicine, California 94305-5324.
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E Radany
Department of Pathology, Stanford University School of Medicine, California 94305-5324.
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M R Lieber
Department of Pathology, Stanford University School of Medicine, California 94305-5324.
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DOI: 10.1128/MCB.11.8.3972
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ABSTRACT

We examined a series of extrachromosomal DNA substrates for V(D)J recombination under replicating and nonreplicating conditions. Complete and partial replications were examined by monitoring the loss of prokaryote-specific adenine methylation at 14 to 22 MboI-DpnI restriction sites (GATC) on the substrates. Some of these sites are within 2 bases of the signal sequence ends. We found that neither coding joint nor signal joint formation requires substrate replication. After ruling out replication as a substrate requirement, we determined whether replication had any effect on the efficiency of V(D)J recombination. Quantitation of V(D)J recombination efficiency on nonreplicating substrates requires some method of monitoring the entry of substrate molecules into the cells. We devised such a method by monitoring DNA repair of substrates into which we had substituted deoxyuridine for 10 to 20% of the thymidine nucleotides in the DNA. The substrates which enter the lymphoid cells were repaired efficiently in vivo by the eukaryotic uracil DNA repair system. Upon plasmid harvest, we distinguished repaired (entered) from unrepaired (not entered) plasmids by cleaving unrepaired molecules with uracil DNA glycoylase and Escherichia coli endonuclease IV in vitro. This method of monitoring DNA entry does not appear to underestimate or overestimate the amount of DNA entry. By using this method, we found no significant quantitative effect of DNA replication on V(D)J recombination efficiency.

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V(D)J recombination: evidence that a replicative mechanism is not required.
C L Hsieh, R P McCloskey, E Radany, M R Lieber
Molecular and Cellular Biology Aug 1991, 11 (8) 3972-3977; DOI: 10.1128/MCB.11.8.3972

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V(D)J recombination: evidence that a replicative mechanism is not required.
C L Hsieh, R P McCloskey, E Radany, M R Lieber
Molecular and Cellular Biology Aug 1991, 11 (8) 3972-3977; DOI: 10.1128/MCB.11.8.3972
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