Volume 1 Supplement 1

Proceedings of the First International Cilia in Development and Disease Scientific Conference (2012)

Open Access

The ciliary proteins Meckelin and Jouberin are required for retinoic acid-dependent neural differentiation of mouse embryonic stem cells

Cilia20121(Suppl 1):P77

DOI: 10.1186/2046-2530-1-S1-P77

Published: 16 November 2012

The dysfunction of the primary cilium, a complex, evolutionarily conserved, organelle playing an important role in sensing and transducing cell signals, is the unifying pathogenetic mechanism of a growing number of diseases collectively termed “ciliopathies”, typically characterized by multiorgan involvement. Developmental defects of the central nervous system (CNS) characterize a subset of ciliopathies showing clinical and genetic overlap, such as Joubert syndrome (JS) and Meckel Syndrome (MS). Although several knock-out mice lacking a variety of ciliary proteins have shown the importance of primary cilia in the development of the brain and CNS-derived structures, developmental in vitro studies, extremely useful to unravel the role of primary cilia along the course of neural differentiation, are still missing. Mouse embryonic stem cells (mESCs) have been recently proven to mimic brain development, giving the unique opportunity to dissect the CNS differentiation process along its sequential steps. In the present study we show that mESCs express the ciliary proteins Meckelin and Jouberin in a developmentally-regulated manner, and that these proteins co-localize with acetylated tubulinlabeled cilia located at the outer embryonic layer. Further, mESCs differentiating along the neuronal lineage activate the cilia-dependent sonic hedgehog signaling machinery, which seems to be impaired in Meckelin knock-down cells but results unaffected in Jouberin-deficient mESCs. However, both seems to lose the ability to acquire a neuronal phenotype. Altogether these findings suggest a pivotal role of Meckelin and Jouberin during embryonic neural specification and indicate mESCs as a suitable tool to investigate the developmental impact of ciliary proteins dysfunction.

Authors’ Affiliations

Istituto Casa Sollievo della Sofferenza- Mendel Laboratory
Consiglio Nazionale delle Ricerche (CNR)
Howard Hughes Medical Institute, University of California
Department of Medical and Surgical Pediatric, University of Messina


© Romani et al; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.