The rodent Four-jointed ortholog Fjx1 regulates dendrite extension

The extrinsic and intrinsic factors that regulate the size and complexity of dendritic arborizations are still poorly understood. Here we identify Fjx1, the rodent ortholog of the Drososphila planar cell polarity (PCP) protein Four-jointed (Fj), as a new inhibitory factor that regulates dendrite ext...

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Bibliographic Details
Published in:Developmental biology 2007-12, Vol.312 (1), p.461-470
Main Authors: Probst, Barbara, Rock, Rebecca, Gessler, Manfred, Vortkamp, Andrea, Püschel, Andreas W.
Format: Article
Language:English
Subjects:
Animals
Dendrite
Dendrites - metabolism
Dentate Gyrus - cytology
Dentate Gyrus - metabolism
Drosophila
Embryo, Mammalian - metabolism
Four-jointed
Hippocampus
Hippocampus - cytology
Mice
Mice, Knockout
Mutation - genetics
Nerve Tissue Proteins - metabolism
Phenotype
Planar cell polarity
Sequence Homology, Amino Acid
Transfection
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Summary:The extrinsic and intrinsic factors that regulate the size and complexity of dendritic arborizations are still poorly understood. Here we identify Fjx1, the rodent ortholog of the Drososphila planar cell polarity (PCP) protein Four-jointed (Fj), as a new inhibitory factor that regulates dendrite extension. The Drosophila gene four-jointed ( fj) has been suggested to provide directional information in wing discs, but the mechanism how it acts is only poorly understood and the function of its mammalian homolog Fjx1 remains to be investigated. We analyzed the phenotype of a null mutation for mouse Fjx1. Homozygous Fjx1 mutants show an abnormal morphology of dendritic arbors in the hippocampus. In cultured hippocampal neurons from Fjx1 mutant mice, loss of Fjx1 resulted in an increase in dendrite extension and branching. Addition of Fjx1 to cultures of dissociated hippocampal neurons had the opposite effect and reduced the length of dendrites and decreased dendritic branching. Rescue experiments with cultured neurons showed that Fjx1 can act both cell-autonomously and non-autonomously. Our results identify Fjx1 as a new inhibitory factor that regulates dendrite extension.
ISSN:0012-1606
1095-564X
DOI:10.1016/j.ydbio.2007.09.054