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Altered Nuclear Distribution of Recombination Protein RAD51 in Maize Mutants Suggests the Involvement of RAD51 in Meiotic Homology Recognition

^a Department of Molecular and Cell Biology, University of California, Berkeley, California 94720-3200
^b Department of Plant and Microbial Biology, University of California, Berkeley, California 94720-3200

¹ To whom correspondence should be addressed. E-mail wpawlows{at}nature.berkeley.edu; fax 510-643-6791

The recombination protein RAD51 is a component of the meiotic recombination pathway and has been proposed to play a role in the homology search, a process by which homologous chromosomes find each other before they pair in the prophase of meiosis. To study the relationship between recombination and chromosome pairing, we examined the distribution of RAD51 foci on meiotic chromosomes in maize mutants with defects in chromosome pairing. The patterns of RAD51 distribution showed dramatic variation among the meiotic mutants. The mutants generally exhibited significant decreases in the number of RAD51 foci at zygotene, corresponding to the degree of their pairing defects. These results provide evidence for a key role of RAD51 structures in the homology search.

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