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Genetics, Vol 121, 433-443, Copyright © 1989
INVESTIGATIONS |
Role of recBC Function in Formation of Chromosomal Rearrangements: A Two-Step Model for Recombination
M. J. Mahan and J. R. Roth
To whom correspondence should be sent.
The role of recBC functions has been tested for three types of chromosomal recombination events: (1) recombination between direct repeats to generate a deletion, (2) recombination between a small circular fragment and the chromosome, and (3) recombination between inversely oriented repeats to form an inversion. Deletion formation by recombination between direct repeats, which does not require a fully reciprocal exchange, is independent of recBC function. Circle integration and inversion formation are both stimulated by the recBC function; these events require full reciprocality. The results suggest that half-reciprocal exchanges can occur without recBC, but recBC functions greatly stimulate completion of a fully reciprocal exchange. We propose that chromosomal recombination is a two-step process, and recBC functions are primarily required for the second step.
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