YIF1B mutations cause a post-natal neurodevelopmental syndrome associated with Golgi and primary cilium alterations

Jorge Diaz, Xavier Gérard, Michel Boris Emerit, Julie Areias, David Geny, Julie Dégardin, Manuel Simonutti, Marie Justine Guerquin, Thibault Collin, Cécile Viollet, Jean Marie Billard, Christine Métin, Laurence Hubert, Farzaneh Larti, Kimia Kahrizi, Rebekah Jobling, Emanuele Agolini, Ranad Shaheen, Alban Zigler, Virginie Rouiller-FabreJean Michel Rozet, Serge Picaud, Antonio Novelli, Seham Alameer, Hossein Najmabadi, Ronald Cohn, Arnold Munnich, Magalie Barth, Licia Lugli, Fowzan S. Alkuraya, Susan Blaser, Maha Gashlan, Claude Besmond, Michèle Darmon, Justine Masson

Research output: Contribution to journalArticlepeer-review


Human post-natal neurodevelopmental delay is often associated with cerebral alterations that can lead, by themselves or associated with peripheral deficits, to premature death. Here, we report the clinical features of 10 patients from six independent families with mutations in the autosomal YIF1B gene encoding a ubiquitous protein involved in anterograde traffic from the endoplasmic reticulum to the cell membrane, and in Golgi apparatus morphology. The patients displayed global developmental delay, motor delay, visual deficits with brain MRI evidence of ventricle enlargement, myelination alterations and cerebellar atrophy. A similar profile was observed in the Yif1b knockout (KO) mouse model developed to identify the cellular alterations involved in the clinical defects. In the CNS, mice lacking Yif1b displayed neuronal reduction, altered myelination of the motor cortex, cerebellar atrophy, enlargement of the ventricles, and subcellular alterations of endoplasmic reticulum and Golgi apparatus compartments. Remarkably, although YIF1B was not detected in primary cilia, biallelic YIF1B mutations caused primary cilia abnormalities in skin fibroblasts from both patients and Yif1b-KO mice, and in ciliary architectural components in the Yif1b-KO brain. Consequently, our findings identify YIF1B as an essential gene in early post-natal development in human, and provide a new genetic target that should be tested in patients developing a neurodevelopmental delay during the first year of life. Thus, our work is the first description of a functional deficit linking Golgipathies and ciliopathies, diseases so far associated exclusively to mutations in genes coding for proteins expressed within the primary cilium or related ultrastructures. We therefore propose that these pathologies should be considered as belonging to a larger class of neurodevelopmental diseases depending on proteins involved in the trafficking of proteins towards specific cell membrane compartments.

Original languageEnglish
Pages (from-to)2911-2928
Number of pages18
Issue number10
Publication statusPublished - Oct 1 2020


  • ER
  • Golgi
  • neurodevelopmental delay
  • primary cilium

ASJC Scopus subject areas

  • Clinical Neurology


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