Abstract
The centromere-specific histone H3 variant CENP-A plays a crucial role in kinetochore specification and assembly. We chose a genetic approach to identify interactors of the Drosophila CENP-A homolog CID. Overexpression of cid in the proliferating eye imaginal disk results in a rough eye phenotype, which is dependent on the ability of the overexpressed protein to localize to the kinetochore. A screen for modifiers of the rough eye phenotype identified mutations in the Drosophila condensin subunit gene Cap-G as interactors. Yeast two-hybrid experiments also reveal an interaction between CID and Cap-G. While chromosome condensation in Cap-G mutant embryos appears largely unaffected, massive defects in sister chromatid segregation occur during mitosis. Taken together, our results suggest a link between the chromatin condensation machinery and kinetochore structure.
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Acknowledgements
We thank Katharina Neugebauer for technical support and C.-ting Wu, Steve DiNardo, and Volker Hartenstein for fly stocks. We are indebted to Thom Kaufman for providing the cid mutant lines prior to publication. We thank members of the laboratory for helpful discussions and Christian F. Lehner for generous support and critical reading of the manuscript. This work was supported by a grant from the Deutsche Forschungsgemeinschaft (He 2354-1).
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Jäger, H., Rauch, M. & Heidmann, S. The Drosophila melanogaster condensin subunit Cap-G interacts with the centromere-specific histone H3 variant CID. Chromosoma 113, 350–361 (2005). https://doi.org/10.1007/s00412-004-0322-4
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DOI: https://doi.org/10.1007/s00412-004-0322-4