PUBLICATION

Mechanisms of prickle 1a function in zebrafish epilepsy and retinal neurogenesis

Authors
Mei, X., Wu, S., Bassuk, A.G., and Slusarski, D.C.
ID
ZDB-PUB-130125-1
Date
2013
Source
Disease models & mechanisms   6(3): 679-688 (Journal)
Registered Authors
Slusarski, Diane C.
Keywords
none
MeSH Terms
  • Adaptor Proteins, Signal Transducing/metabolism*
  • Animals
  • Dose-Response Relationship, Drug
  • Embryo, Nonmammalian/drug effects
  • Embryo, Nonmammalian/metabolism
  • Epilepsy/metabolism*
  • Gene Knockdown Techniques
  • Humans
  • LIM Domain Proteins/metabolism*
  • Morpholinos/pharmacology
  • Mutation/genetics
  • Neurogenesis*/drug effects
  • Pentylenetetrazole/pharmacology
  • Retina/drug effects
  • Retina/metabolism*
  • Swimming
  • Zebrafish/embryology
  • Zebrafish/metabolism*
  • Zebrafish Proteins/metabolism*
PubMed
23324328 Full text @ Dis. Model. Mech.
Abstract

Epilepsy is a complex neurological disorder characterized by unprovoked seizures. The etiology is heterogeneous with both genetic and environmental causes. Genes that regulate neurotransmitters and ion channels in the central nervous system have been associated with epilepsy. However, a recent screening in human epilepsy patients identified mutations in the PRICKLE1 (PK1) locus, highlighting a potentially novel mechanism underlying seizures. PK1 is a core component of the Planar Cell Polarity network that regulates tissue polarity. Zebrafish studies have shown that Pk1 coordinates cell movement, neuronal migration and axonal outgrowth during embryonic development. Yet how dysfunction of Pk1 relates to epilepsy is unknown. To address the mechanism underlying epileptogenesis, we use zebrafish to characterize Pk1a function and epilepsy-related mutant forms. We show that knockdown of pk1a activity sensitizes zebrafish larva to a convulsant drug. To model defects in the central nervous system, we use the retina and find that pk1a knockdown induces neurite outgrowth defects; yet visual function is maintained. Furthermore, we characterized the functional and biochemical properties of the PK1 mutant forms identified in human patients. Functional analyses demonstrate that the wild-type Pk1a partially suppresses the gene knockdown retinal defects but not the mutant forms. Biochemical analysis reveals increased ubiquitination of one mutant form and decreased translational efficiency of another mutant form compared to the wild-type Pk1a. Taken together, our results indicate that mutation of human PK1 may lead to defects in neurodevelopment and signal processing providing insight into seizure predisposition in these patients.

Genes / Markers
Figures
Show all Figures
Expression
Phenotype
Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
Errata and Notes