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Agenesis of the corpus callosum (AgCC) is a frequent brain disorder found in over 80 human congenital syndromes including ciliopathies. Here, we report a severe AgCC in  Ftm/Rpgrip1l  knockout mouse, which provides a valuable model for Meckel–Grüber syndrome.  Rpgrip1l  encodes a protein of the ciliary transition zone, which is essential for ciliogenesis in several cell types in mouse including neuroepithelial cells in the developing forebrain. We show that AgCC in  Rpgrip1l −/–   mouse is associated with a disturbed location of guidepost cells in the dorsomedial telencephalon. This mislocalization results from early patterning defects and abnormal cortico-septal boundary (CSB) formation in the medial telencephalon. We demonstrate that all these defects primarily result from altered GLI3 processing. Indeed, AgCC, together with patterning defects and mispositioning of guidepost cells, is rescued by overexpressing in  Rpgrip1l −/−   embryos, the short repressor form of the GLI3 transcription factor (GLI3R), provided by the  Gli3 Δ699   allele. Furthermore,  Gli3 Δ699   also rescues AgCC in  Rfx3 −/−   embryos deficient for the ciliogenic RFX3 transcription factor that regulates the expression of several ciliary genes. These data demonstrate that GLI3 processing is a major outcome of primary cilia function in dorsal telencephalon morphogenesis. Rescuing CC formation in two independent ciliary mutants by  GLI3 Δ699   highlights the crucial role of primary cilia in maintaining the proper level of GLI3R required for morphogenesis of the CC.

The role of primary cilia in corpus callosum formation is mediated by production of the Gli3 repressor