Trans-acting small RNA determines dominance relationships in Brassica self-incompatibility

Yoshiaki Tarutani, Hiroshi Shiba, Megumi Iwano, Tomohiro Kakizaki, Go Suzuki, Masao Watanabe, Akira Isogai and Seiji Takayama ()
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Yoshiaki Tarutani: Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan
Hiroshi Shiba: Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan
Megumi Iwano: Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan
Tomohiro Kakizaki: Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka 020-8550, Japan
Go Suzuki: Osaka Kyoiku University, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
Masao Watanabe: Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Akira Isogai: Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan
Seiji Takayama: Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan

Nature, 2010, vol. 466, issue 7309, 983-986

Abstract: Dominant role for sRNA In diploid organisms, the expression levels of the two inherited alleles can be biased by dominant or recessive relationships, which determine the final phenotype. In Brassica, self-incompatibility in pollen is determined by dominance relationships between the two alleles of the pollen determinant gene SP11. These relationships are now shown to be controlled by a small non-coding RNA (sRNA) encoded at the SP11 flanking region. The sRNA, derived from the dominant SP11 allele, acts in trans to induce DNA methylation, silencing the recessive allele. This finding could suggest a more general role for sRNA in controlling monoallelic gene expression, which was recently found to be widespread in heterozygous organisms.

Date: 2010
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DOI: 10.1038/nature09308

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