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Nucleic Acids Research, Vol 24, Issue 20 3968-3973, Copyright © 1996 by Oxford University Press

ARTICLES

The presence of direct repeats does not influence coding joint formation during V(D)J recombination

F Nourrit, QT Nguyen, F Rougeon and S Kallenbach
Unite de Genetique et Biochimie du Developpement, Institut Pasteur,Paris, France.

During the recombination process that assembles immunoglobulin and T- cell receptor gene segments, the coding ends to be joined are extensively processed. Contradictory reports have been made in the past about the existence of homology directed mechanisms in V(D)J recombination. In this study we analyse coding end processing and the influence of the presence of homology stretches on coding joint formation using artificial substrates in which short sequence changes creating direct repeats have been introduced. These changes were monitored 3 bp away from the termini in order to avoid any differences due to the initiation steps of V(D)J recombination. Our results show that the sequence of the coding ends influences joint formation, but no evidence was found for a mechanistic bias due to the presence of direct repeats.
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