Abstract
Mutations in the aberrant X segragation (Axs) gene disrupt the segregation of achiasmate chromosomes during female meiosis in Drosophila melanogaster. We show that Axs encodes the founding member of an eukaryotic family of transmembrane proteins. Axs protein colocalizes with components of the endoplasmic reticulum and is present within a structure ensheathing the meiotic spindle. In both meiotic and mitotic cells, Axs is recruited to the microtubules of assembling spindles. We propose that Axs and the sheath represent novel mediators of meiotic spindle assembly and chromosome segregation.
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Acknowledgements
We thank T. Arbel for her efforts in the early part of this work. We also acknowledge the generous collaborative support of M. Kuroda during the early parts of these studies. We are grateful to T. **e for critically reading the manuscript. We thank C. Orme and H. Peters for technical assistance. This research was supported by a grant to R.S.H. from the National Science Foundation. The wisdom and support of the late DeLill Nasser is gratefully acknowledged.
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Kramer, J., Hawley, R. The spindle-associated transmembrane protein Axs identifies a membranous structure ensheathing the meiotic spindle. Nat Cell Biol 5, 261–263 (2003). https://doi.org/10.1038/ncb944
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DOI: https://doi.org/10.1038/ncb944
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