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| Research article summary (published 29 Apr 2009): |
Nodal signalling imposes left-right asymmetry upon neurogenesis in the habenular nuclei.
Full Abstract
The habenulae are evolutionarily conserved bilateral nuclei in the epithalamus that relay input from the forebrain to the ventral midbrain. In zebrafish, the habenulae display left-right (L/R) asymmetries in gene expression and axonal projections. The elaboration of habenular asymmetries requires the presence of a second asymmetric structure, the parapineal, the laterality of which is biased by unilateral Nodal signalling. Here we show that neurons are present earlier in the left habenula than in the right, but, in contrast to other habenular asymmetry phenotypes, this asymmetry in neurogenesis is not dependent on the parapineal. Embryos in which the L/R asymmetry in Nodal signalling is abolished display symmetric neurogenesis, revealing a requirement for this pathway in asymmetrically biasing neurogenesis. Our results provide evidence of a direct requirement for unilateral Nodal activity in establishing an asymmetry per se, rather than solely in biasing its laterality.
Author information
Author/s: Roussigné, Myriam (M); Bianco, Isaac H (IH); Wilson, Stephen W (SW); Blader, Patrick (P);
Affiliation: Université de Toulouse, UPS, Toulouse, France.
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Development (Cambridge, England) (Development), published in England. (Language: eng)
Reference: 2009-May; vol 136 (issue 9) : pp 1549-57
Dates: Created 2009/04/13; Completed 2009/06/25;
PMID: 19363156, status: MEDLINE (last retrieval date: 6/25/2009, IMS Date: )
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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