Pathogen corruption and site-directed recombination at a plant disease resistance gene cluster.

Genome Research
Ervin D Nagy, Jeffrey L Bennetzen

Abstract

The Pc locus of sorghum (Sorghum bicolor) determines dominant sensitivity to a host-selective toxin produced by the fungal pathogen Periconia circinata. The Pc region was cloned by a map-based approach and found to contain three tandemly repeated genes with the structures of nucleotide binding site-leucine-rich repeat (NBS-LRR) disease resistance genes. Thirteen independent Pc-to-pc mutations were analyzed, and each was found to remove all or part of the central gene of the threesome. Hence, this central gene is Pc. Most Pc-to-pc mutations were associated with unequal recombination. Eight recombination events were localized to different sites in a 560-bp region within the approximately 3.7-kb NBS-LRR genes. Because any unequal recombination located within the flanking NBS-LRR genes would have removed Pc, the clustering of cross-over events within a 560-bp segment indicates that a site-directed recombination process exists that specifically targets unequal events to generate LRR diversity in NBS-LRR loci.

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Citations

Jul 26, 2013·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Justin D FarisSteven S Xu
Aug 18, 2010·Molecular Biology and Evolution·Sha LuoHanhui Kuang
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