Title

The cilia protein IFT88 is required for spindle orientation in mitosis

UMMS Affiliation

Program in Molecular Medicine; Program in Gene Function and Expression

Date

3-29-2011

Document Type

Article

Medical Subject Headings

Anatomy; Animals; Cell Line; Cilia; Hela Cells; Humans; Kidney; Mice; Mice, Transgenic; Microtubules; *Mitosis; Mitotic Spindle Apparatus; Recombinant Fusion Proteins; Tubulin; Tumor Suppressor Proteins; Zebrafish; Zebrafish Proteins

Disciplines

Cell Biology | Cellular and Molecular Physiology | Molecular Genetics

Abstract

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.

Rights and Permissions

Citation: Nat Cell Biol. 2011 Apr;13(4):461-8. Epub 2011 Mar 27. Link to article on publisher's site

Comments

Co-author Alison Bright is a student in the Interdisciplinary Graduate Program in the Graduate School of Biomedical Sciences (GSBS) at UMass Medical School.

Related Resources

Link to Article in PubMed

PubMed ID

21441926