Abstract
The self-incompatibility (S-) locus region of plants in the Brassica family is a small genome region. In Arabidopsis lyrata, the S-genes, SRK and SCR, encode the functional female and pollen recognition proteins, which must be coadapted to maintain correct associations between the two component genes, and thus self-incompatibility (SI). Recombinants would be self-compatible and thus probably disadvantageous in self-incompatible species. Therefore, tight linkage between the two genes in incompatibility systems is predicted to evolve to avoid producing such recombinant haplotypes. The evolution of low recombination in S-locus regions has not been rigorously tested. To test whether these regions' per-nucleotide recombination rates differ from those elsewhere in the genome, and to investigate whether the A. lyrata S-loci have the predicted effect on diversity in their immediate genome region, we studied diversity in genes that are linked to the S-loci but are not involved in incompatibility and are not under balancing selection. Compared with other A. lyrata loci, genes linked to the S-loci have extraordinarily high polymorphism. Our estimated recombination in this region, from fitting a model of the effects of S-allele polymorphism on linked neutral sites, supports the hypothesis of locally suppressed recombination around the S-locus.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Arabidopsis / genetics*
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Arabidopsis Proteins / genetics
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Base Sequence
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DNA Primers
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Genes, Plant / genetics*
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Genetic Linkage*
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Molecular Sequence Data
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Plant Proteins / genetics
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Polymorphism, Genetic*
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Protein Kinases / genetics
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Recombination, Genetic / genetics*
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Selection, Genetic*
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Sequence Analysis, DNA
Substances
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Arabidopsis Proteins
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DNA Primers
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Plant Proteins
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SCR protein, Arabidopsis
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Protein Kinases
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S-receptor kinase
Associated data
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GENBANK/AY943570
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