An ana2/ctp/mud complex regulates spindle orientation in Drosophila neuroblasts.

Abstract

Drosophila neural stem cells, larval brain neuroblasts (NBs), align their mitotic spindles along the apical/basal axis during asymmetric cell division (ACD) to maintain the balance of self-renewal and differentiation. Here, we identified a protein complex composed of the tumor suppressor anastral spindle 2 (Ana2), a dynein light-chain protein Cut up (Ctp), and Mushroom body defect (Mud), which regulates mitotic spindle orientation. We isolated two ana2 alleles that displayed spindle misorientation and NB overgrowth phenotypes in larval brains. The centriolar protein Ana2 anchors Ctp to centrioles during ACD. The centriolar localization of Ctp is important for spindle orientation. Ana2 and Ctp localize Mud to the centrosomes and cell cortex and facilitate/maintain the association of Mud with Pins at the apical cortex. Our findings reveal that the centrosomal proteins Ana2 and Ctp regulate Mud function to orient the mitotic spindle during NB asymmetric division.

DOI: 10.1016/j.devcel.2011.08.002

Cite this paper

@article{Wang2011AnAC, title={An ana2/ctp/mud complex regulates spindle orientation in Drosophila neuroblasts.}, author={Cheng Wang and Song Li and Jens Januschke and Fabrizio Rossi and Yasushi Izumi and Gisela Garc{\'i}a-Alvarez and Serene Sze Ling Gwee and Swee Beng Soon and Harpreet Kaur Sidhu and Fengwei Yu and Fumio Matsuzaki and Cayetano Gonzalez and Hongyan Wang}, journal={Developmental cell}, year={2011}, volume={21 3}, pages={520-33} }