University of Cambridge > > Plant Sciences Departmental Seminars > The Evolution of Imprinted Gene Expression in Cultivated Rice

The Evolution of Imprinted Gene Expression in Cultivated Rice

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact sb771.

Arabidopsis thaliana endosperm, a transient tissue that nourishes the embryo, exhibits extensive localized DNA demethylation on maternally-inherited chromosomes, which mediates parent-of-origin-specific (imprinted) gene expression. Endosperm DNA in rice and maize is likewise locally hypomethylated. We have shown that localized hypomethylation in rice endosperm occurs solely on the maternal genome, preferring regions of high DNA accessibility. Maternally expressed imprinted genes are enriched for hypomethylation at putative promoter regions and transcriptional termini, and paternally expressed genes at promoters and gene bodies, mirroring our recent results in A. thaliana. Our data indicate that localized hypomethylation of maternal endosperm DNA is conserved in flowering plants. By examining divergent rice cultivars, we also identified genes the imprinting of which has changed in the course of rice evolution. In some cases, this variation is genetic, with gene expression differences caused by underlying sequence changes, such as transposon insertions. In other cases, methylation differences that control gene expression exist in the absence of significant genetic polymorphism. The results suggest that epigenetic variation contributes to short term plant evolution and may influence traits selected by crop breeders.

This talk is part of the Plant Sciences Departmental Seminars series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.


© 2006-2023, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity