Histone Code Cracked?

This report in Nature presents genome-wide CHIP maps of a variety of histone modifications in a few types of embryonic and stem cell lineages. Seems like they found some very interesting signatures that correlated well with gene expression status. For example, trimethylation at lysines 4 and 27 could discriminate expressed versus inducible versus repressed genes, whereas the same modification at lysines 4 and 9 marks imprinted regions. Very cool. Of course we'll have to see what the AC has to say for the expert opinion.

I once proposed a similar project in a mock post-doc grant proposal for a systems biology grad class I took (except with the added minor step of cloning mice by somatic cell nuclear transfer). It got pretty bad reviews. Apparently some people thought it was too ambitious. Go figure. This one only took 15 authors...