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Vol. 18, Issue 11, 4353-4364, November 2007

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The Zebrafish fleer Gene Encodes an Essential Regulator of Cilia Tubulin Polyglutamylation

Nephrology Division, Massachusetts General Hospital, Charlestown, MA 02129

Submitted June 6, 2007; Revised July 16, 2007; Accepted August 21, 2007
Monitoring Editor: Stephen Doxsey

Cilia and basal bodies are essential organelles for a broad spectrum of functions, including the development of left-right asymmetry, kidney function, cerebrospinal fluid transport, generation of photoreceptor outer segments, and hedgehog signaling. Zebrafish fleer (flr) mutants exhibit kidney cysts, randomized left-right asymmetry, hydrocephalus, and rod outer segment defects, suggesting a pleiotropic defect in ciliogenesis. Positional cloning flr identified a tetratricopeptide repeat protein homologous to the Caenorhabditis elegans protein DYF1 that was highly expressed in ciliated cells. flr pronephric cilia were shortened and showed a reduced beat amplitude, and olfactory cilia were absent in mutants. flr cilia exhibited ultrastructural defects in microtubule B-tubules, similar to axonemes that lack tubulin posttranslational modifications (polyglutamylation or polyglycylation). flr cilia showed a dramatic reduction in cilia polyglutamylated tubulin, indicating that flr encodes a novel modulator of tubulin polyglutamylation. We also found that the C. elegans flr homologue, dyf-1, is also required for tubulin polyglutamylation in sensory neuron cilia. Knockdown of zebrafish Ttll6, a tubulin polyglutamylase, specifically eliminated tubulin polyglutamylation and cilia formation in olfactory placodes, similar to flr mutants. These results are the first in vivo evidence that tubulin polyglutamylation is required for vertebrate cilia motility and structure, and, when compromised, results in failed ciliogenesis.

The online version of this article contains supplemental material at MBC Online (http://www.molbiolcell.org).

* Present address: Department of Medicine, MetroHealth Medical Center, and Department of Genetics, Case Western Reserve University School of Medicine, Cleveland, OH 44109.

Address correspondence to: Iain Drummond (idrummon{at}receptor.mgh.harvard.edu)

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