An Fgf8-dependent bistable cell migratory event establishes CNS asymmetry.

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

Neuron

journal_title

Neuron

authors

Regan JC,Concha ML,Roussigne M,Russell C,Wilson SW

doi

10.1016/j.neuron.2008.11.030

subject

Has Abstract

pub_date

2009-01-15 00:00:00

pages

27-34

issue

1

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(08)01052-0

journal_volume

61

pub_type

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