Dominance hierarchy arising from the evolution of a complex small RNA regulatory network

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Durand, Eléonore | Méheust, Raphaël | Soucaze, Marion | Goubet, Pauline M. | Gallina, Sophie | Poux, Céline | Fobis-Loisy, Isabelle | Guillon, Eline | Gaude, T. | Sarazin, Alexis | Figeac, Martin | Prat, Elisa | Marande, William | Berges, Helene, H. | Vekemans, Xavier | Billiard, Sylvain | Castric, Vincent

Edité par CCSD ; American Association for the Advancement of Science (AAAS) -

International audience. The prevention of fertilization through self-pollination (or pollination by a close relative) in the Brassicaceae plant family is determined by the genotype of the plant at the self-incompatibility locus (S locus). The many alleles at this locus exhibit a dominance hierarchy that determines which of the two allelic specificities of a heterozygous genotype is expressed at the phenotypic level. Here, we uncover the evolution of how at least 17 small RNA (sRNA)-producing loci and their multiple target sites collectively control the dominance hierarchy among alleles within the gene controlling the pollen S-locus phenotype in a self-incompatible Arabidopsis species. Selection has created a dynamic repertoire of sRNA-target interactions by jointly acting on sRNA genes and their target sites, which has resulted in a complex system of regulation among alleles.

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