Sparked by the discovery of LSD1, the first bona fide histone lysine demethylase, a burst of research has opened a new era in understanding how chromatin is regulated, including the identification of the JmjC ___domain–containing histone demethylases. Now, several independent studies provide evidence that yeast Yjr119Cp, human JARID1 and Drosophila Lid, all members of the JmjC family, demethylate histone H3 trimethyl-Lys4, a mark of transcriptionally active chromatin.
- Eric Metzger
- Roland Schüle