Species-wide genetic incompatibility analysis identifies immune genes as hot spots of deleterious epistasis.
Species-wide genetic incompatibility analysis identifies immune genes as hot spots of deleterious epistasis.
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DOI:
10.1016/j.cell.2014.10.049
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发表时间:
2014-12-04
期刊:
影响因子:
64.5
通讯作者:
Weigel D
中科院分区:
文献类型:
--
作者:
Chae E;Bomblies K;Kim ST;Karelina D;Zaidem M;Ossowski S;Martín-Pizarro C;Laitinen RA;Rowan BA;Tenenboim H;Lechner S;Demar M;Habring-Müller A;Lanz C;Rätsch G;Weigel D
Intraspecific genetic incompatibilities prevent the assembly of specific alleles into single genotypes and influence genome- and species-wide patterns of sequence variation. A common incompatibility in plants is hybrid necrosis, characterized by autoimmune responses due to epistatic interactions between natural genetic variants. By systematically testing thousands of F1 hybrids of Arabidopsis thaliana strains, we identified a small number of incompatibility hotspots in the genome, often in regions densely populated by NLR immune receptor genes. In several cases, these immune receptor loci interact with each other, suggestive of conflict within the immune system. A particularly dangerous locus is a highly variable cluster of NLR genes, DANGEROUS MIX2 (DM2), which causes multiple, independent incompatibilities with genes that encode a range of biochemical functions, including NLRs. Our findings suggest that deleterious interactions of immune receptors at the front lines of host-pathogen co-evolution limit the combinations of favorable disease resistance alleles accessible to plant genomes.
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