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Development ePress online publication date 8 Dec 2005
doi: 10.1242/dev.02199
Research article
The JIL-1 histone H3S10 kinase regulates dimethyl H3K9 modifications and heterochromatic spreading in Drosophila
Weiguo Zhang,
Huai Deng,
Xiaomin Bao,
Stephanie Lerach,
Jack Girton,
Jørgen Johansen,
and
Kristen M. Johansen*
* Author for correspondence (e-mail: kristen{at}iastate.edu)
In this study, we show that a reduction in the levels of the JIL-1 histone H3S10 kinase results in the spreading of the major heterochromatin markers dimethyl H3K9 and HP1 to ectopic locations on the chromosome arms, with the most pronounced increase on the X chromosomes. Genetic interaction assays demonstrated that JIL-1 functions in vivo in a pathway that includes Su(var)3-9, which is a major catalyst for dimethylation of the histone H3K9 residue, HP1 recruitment, and the formation of silenced heterochromatin. We further provide evidence that JIL-1 activity and localization are not affected by the absence of Su(var)3-9 activity, suggesting that JIL-1 is upstream of Su(var)3-9 in the pathway. Based on these findings, we propose a model where JIL-1 kinase activity functions to maintain euchromatic regions by antagonizing Su(var)3-9-mediated heterochromatization.
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© The Company of Biologists Ltd 2005
