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Type: Journal article
Title: Contribution of mGluR and Fmr1 functional pathways to neurite morphogenesis, craniofacial development and fragile X syndrome
Author: Tucker, B.
Richards, R.
Lardelli, M.
Citation: Human Molecular Genetics, 2006; 15(23):3446-3458
Publisher: Oxford Univ Press
Issue Date: 2006
ISSN: 0964-6906
Organisation: ARC Special Research Center for the Molecular Genetics of Development
Statement of
Ben Tucker, Robert I. Richards and Michael Lardelli
Abstract: Fragile X Syndrome is a leading heritable cause of mental retardation that results from the loss of FMR1 gene function. Studies in mouse and Drosophila model organisms have been critical in understanding many aspects of the loss of function of the FMR1 gene in the human syndrome. Here, we establish that the zebrafish is a useful model organism for the study of the human fragile X syndrome and can be used to examine phenotypes that are difficult or inaccessible to observation in other model organisms. Using morpholino knockdown of the fmr1 gene, we observed abnormal axonal branching of Rohon–Beard and trigeminal ganglion neurons and guidance and defasciculation defects in the lateral longitudinal fasciculus. We demonstrate that this axonal branching defect can be rescued by treatment with MPEP [2-methyl-6-(phenylethynyl) pyridine]. This is consistent with an interaction between mGluR signalling and fmr1 function in neurite morphogenesis. We also describe novel findings of abnormalities in the abundance of trigeminal ganglion neurons and of craniofacial abnormalities apparently due to dysmorphic cartilage formation. These abnormalities may be related to a role for fmr1 in neural crest cell specification and possibly in migration.
Keywords: Facial Bones
Neural Crest
Craniofacial Abnormalities
Fragile X Syndrome
Disease Models, Animal
RNA-Binding Proteins
Zebrafish Proteins
Receptors, Metabotropic Glutamate
Oligodeoxyribonucleotides, Antisense
Excitatory Amino Acid Antagonists
DOI: 10.1093/hmg/ddl422
Appears in Collections:Aurora harvest 6
Centre for the Molecular Genetics of Development publications
Molecular and Biomedical Science publications

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