The cilia protein IFT88 is required for spindle orientation in mitosis
- Delaval, B., Bright, A., Lawson, N.D., and Doxsey, S.
- Nature cell biology 13(4): 461-468 (Journal)
- Registered Authors
- Lawson, Nathan
- MeSH Terms
- Cell Line
- HeLa Cells
- Mice, Transgenic
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/metabolism
- Spindle Apparatus/metabolism*
- Spindle Apparatus/ultrastructure
- Tumor Suppressor Proteins/genetics
- Tumor Suppressor Proteins/metabolism*
- Zebrafish Proteins/genetics
- Zebrafish Proteins/metabolism*
- 21441926 Full text @ Nat. Cell Biol.
Delaval, B., Bright, A., Lawson, N.D., and Doxsey, S. (2011) The cilia protein IFT88 is required for spindle orientation in mitosis. Nature cell biology. 13(4):461-468.
Cilia dysfunction has long been associated with cyst formation and ciliopathies. More recently, misoriented cell division has been observed in cystic kidneys, but the molecular mechanism leading to this abnormality remains unclear. Proteins of the intraflagellar transport (IFT) machinery are linked to cystogenesis and are required for cilia formation in non-cycling cells. Several IFT proteins also localize to spindle poles in mitosis, indicating uncharacterized functions for these proteins in dividing cells. Here, we show that IFT88 depletion induces mitotic defects in human cultured cells, in kidney cells from the IFT88 mouse mutant Tg737(orpk) and in zebrafish embryos. In mitosis, IFT88 is part of a dynein1-driven complex that transports peripheral microtubule clusters containing microtubule-nucleating proteins to spindle poles to ensure proper formation of astral microtubule arrays and thus proper spindle orientation. This work identifies a mitotic mechanism for a cilia protein in the orientation of cell division and has important implications for the etiology of ciliopathies.
Genes / Markers
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes