JCVI: Differential Methylation of Genes and Repeats In Land Plants
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Rabinowicz, P. D., Citek, R., Budiman, M. A., Nunberg, A., Bedell, J. A., Lakey, N., O'Shaughnessy A, L., Nascimento, L. U., McCombie, W. R., Martienssen, R. A.

Differential Methylation of Genes and Repeats In Land Plants

Genome Res. 2005 Oct 01; 15(10): 1431-40.

PubMed Citation


The hypomethylated fraction of plant genomes is usually enriched in genes and can be selectively cloned using methylation filtration (MF). Therefore, MF has been used as a gene enrichment technology in sorghum and maize, where gene enrichment was proportional to genome size. Here we apply MF to a broad variety of plant species spanning a wide range of genome sizes. Differential methylation of genic and non-genic sequences was observed in all species tested, from non-vascular to vascular plants, but in some cases, such as wheat and pine, a lower than expected level of enrichment was observed. Remarkably, hexaploid wheat and pine show a dramatically large number of gene-like sequences relative to other plants. In hexaploid wheat, this apparent excess of genes may reflect an abundance of methylated pseudogenes, which may thus be more prevalent in recent polyploids.