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Early Forebrain Wiring: Genetic Dissection Using Conditional Celsr3 Mutant Mice
Libing Zhou,1
Isabelle Bar,2*
Younès Achouri,1
Kenneth Campbell,3
Olivier De Backer,2
Jean M. Hebert,4
Kevin Jones,5
Nicoletta Kessaris,6
Catherine Lambert de Rouvroit,2
Dennis O'Leary,7
William D. Richardson,6
Andre M. Goffinet,1
Fadel Tissir1
Abstract:
Development of axonal tracts requires interactions between growthcones and the environment. Tracts such as the anterior commissureand internal capsule are defective in mice with null mutationof Celsr3. We generated a conditional Celsr3 allele, allowingregional inactivation. Inactivation in telencephalon, ventralforebrain, or cortex demonstrated essential roles for Celsr3in neurons that project axons to the anterior commissure andsubcerebral targets, as well as in cells that guide axons throughthe internal capsule. When Celsr3 was inactivated in cortex,subcerebral projections failed to grow, yet corticothalamicaxons developed normally, indicating that besides guidepostcells, additional Celsr3-independent cues can assist their progression.These observations provide in vivo evidence that Celsr3-mediatedinteractions between axons and guidepost cells govern axonaltract formation in mammals.
1 Developmental Neurobiology, Université Catholique de Louvain, 1200 Bruxelles, Belgique. 2 Facultés Universitaires Notre-Dame de la Paix, 5000 Namur, Belgique. 3 Division of Developmental Biology, Children's Hospital Research Foundation, Cincinnati, OH 45229, USA. 4 Albert Einstein College of Medicine, Bronx, NY 10461, USA. 5 University of Colorado, Boulder, CO 80309, USA. 6 University College London, London WC1E 6AE, UK. 7 Salk Institute, La Jolla, CA 92037, USA.
* Present address: Université Libre de Bruxelles, 1050Bruxelles, Belgique.
To whom correspondence should be addressed. E-mail: fadel.tissir{at}uclouvain.be
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