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The Journal of Immunology, Vol 154, Issue 12 6453-6465, Copyright © 1995 by American Association of Immunologists

ARTICLES

Analysis of direct and inverted DJH rearrangements in a human Ig heavy chain transgenic minilocus

N Tuaillon, AB Miller, PW Tucker and JD Capra
University of Texas Southwestern Medical Center, Department of Microbiology, Dallas 75235, USA.

D to JH rearrangement can occur either by a deletional or an inversional mechanism. In this study, we have analyzed deletional and inversional D to JH recombination in a human Ig heavy chain transgenic minilocus. The analysis of these events in a transgenic minilocus rather than in vivo in the human is simplified by the presence of a limited number of well defined VH, D, and JH gene segments in the minilocus. We show that in the transgenic minilocus, all D gene segments can be rearranged by deletion and virtually all can be rearranged by inversion. We also show that depending upon the D gene segment, rearrangement by deletion occurs approximately 1 to 1000 times more frequently than rearrangement by inversion. Our data suggest that in vivo, signal and coding end sequences are the major influences on the rearrangement frequency of a particular gene segment in a given orientation rather than its position within the transgenic locus. Additionally, our data indicate that intronic and recombination signal sequences are involved in the bias for deletion over inversion rather than the recombinase machinery itself.


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