Abstract:
:Neuroanatomical and functional asymmetries are universal features of the vertebrate CNS, but how asymmetry is generated is unknown. Here we show that zebrafish fgf8 mutants do not elaborate forebrain asymmetries, demonstrated by the failure of the parapineal nucleus to migrate from its initial midline position to the left side of the brain. Local provision of Fgf8 restores the asymmetric migration of parapineal cells, usually to the left, irrespective of the location of the Fgf8 source. This laterality bias is due to left-sided Nodal signaling and when the bias in Nodal signaling is removed, parapineal cells migrate toward the source of Fgf8 protein. This study presents a mechanism for breaking neuroanatomical symmetry through Fgf8-dependent regulation of bistable left- or right-sided migration of the parapineal. The combined action of Fgf and Nodal signals ensures the establishment of neuroanatomical asymmetries with consistent laterality.
journal_name
Neuronjournal_title
Neuronauthors
Regan JC,Concha ML,Roussigne M,Russell C,Wilson SWdoi
10.1016/j.neuron.2008.11.030subject
Has Abstractpub_date
2009-01-15 00:00:00pages
27-34issue
1eissn
0896-6273issn
1097-4199pii
S0896-6273(08)01052-0journal_volume
61pub_type
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