Letter | Published:

Methylation at lysine 4 of histone H3 in ecdysone-dependent development of Drosophila

Abstract

Steroid hormones fulfil important functions in animal development. In Drosophila, ecdysone triggers moulting and metamorphosis through its effects on gene expression1. Ecdysone works by binding to a nuclear receptor, EcR, which heterodimerizes with the retinoid X receptor homologue Ultraspiracle2,3. Both partners are required for binding to ligand or DNA4,5,6. Like most DNA-binding transcription factors, nuclear receptors activate or repress gene expression by recruiting co-regulators, some of which function as chromatin-modifying complexes7,8. For example, p160 class coactivators associate with histone acetyltransferases and arginine histone methyltransferases9. The Trithorax-related gene of Drosophila encodes the SET domain protein TRR. Here we report that TRR is a histone methyltransferases capable of trimethylating lysine 4 of histone H3 (H3-K4). trr acts upstream of hedgehog (hh) in progression of the morphogenetic furrow, and is required for retinal differentiation. Mutations in trr interact in eye development with EcR, and EcR and TRR can be co-immunoprecipitated on ecdysone treatment. TRR, EcR and trimethylated H3-K4 are detected at the ecdysone-inducible promoters of hh and BR-C in cultured cells, and H3-K4 trimethylation at these promoters is decreased in embryos lacking a functional copy of trr. We propose that TRR functions as a coactivator of EcR by altering the chromatin structure at ecdysone-responsive promoters.

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Acknowledgements

We thank C. Thummel, F. Kafatos, J. Treisman, M. Fujioka, T. Kornberg and Y. Zhang for antibodies, mutant stocks and mutant histones; and J. Kumar and F. R. Turner for the scanning electron microscopy images. This work was supported by a grant from the National Cancer Institute (to A.M.); an NIH award (to J.B.J.); a grant from the NSF (to P.C.); and an NIH training grant (to E.C.).

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Correspondence to Alexander Mazo.

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The authors declare that they have no competing financial interests.

Supplementary information

Supplementary Figure 1 (JPG 277 kb)

Supplementary Figure 2 (JPG 811 kb)

Supplementary Figure Legends and Methods (DOC 35 kb)

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Further reading

Figure 1: TRR is a nuclear protein that methylates H3-K4.
Figure 2: TRR interacts genetically and associates in vitro and in vivo with components of the ecdysone receptor complex.
Figure 3: The role of trr during eye development.
Figure 4: Molecular effects of ecdysone.

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