Zebrafish Prickle1b mediates facial branchiomotor neuron migration via a farnesylation-dependent nuclear activity.

Publication Type:

Journal Article

Source:

Development (Cambridge, England), Volume 138, Issue 10, p.2121-32 (2011)

Keywords:

2011, Amino Acid Sequence, Animals, Animals, Genetically Modified, Base Sequence, Basic Sciences Division, Carrier Proteins, Cell Movement, Cell Nucleus, Center-Authored Paper, Comparative Medicine Core Facility, DNA, Complementary, Farnesyltranstransferase, Gene Expression Regulation, Developmental, Gene Knockdown Techniques, Hydroxymethylglutaryl CoA Reductases, Models, Biological, Molecular Sequence Data, Motor Neurons, Mutation, Neurogenesis, Protein Prenylation, Repressor Proteins, Scientific Imaging Core Facility, Sequence Homology, Amino Acid, Shared Resources, Signal Transduction, zebrafish, Zebrafish Proteins

Abstract:

The facial branchiomotor neurons (FBMNs) undergo a characteristic tangential migration in the vertebrate hindbrain. We previously used a morpholino knockdown approach to reveal that zebrafish prickle1b (pk1b) is required for this migration. Here we report that FBMN migration is also blocked in a pk1b mutant with a disruption in the consensus farnesylation motif. We confirmed that this lipid modification is required during FBMN migration by disrupting the function of farnesyl biosynthetic enzymes. Furthermore, farnesylation of a tagged Pk1b is required for its nuclear localization. Using a unique rescue approach, we have demonstrated that Pk1b nuclear localization and farnesylation are required during FBMN migration. Our data suggest that Pk1b acts at least partially independently of core planar cell polarity molecules at the plasma membrane, and might instead be acting at the nucleus. We also found that the neuronal transcriptional silencer REST is necessary for FBMN migration, and we provide evidence that interaction between Pk1b and REST is required during this process. Finally, we demonstrate that REST protein, which is normally localized in the nuclei of migrating FBMNs, is depleted from the nuclei of Pk1b-deficient neurons. We conclude that farnesylation-dependent nuclear localization of Pk1b is required to regulate REST localization and thus FBMN migration.