INPP5E mutations cause primary cilium signaling defects, ciliary instability and ciliopathies in human and mouse.

Abstract

The primary cilium is an antenna-like structure that protrudes from the cell surface of quiescent/differentiated cells and participates in extracellular signal processing. Here, we report that mice deficient for the lipid 5-phosphatase Inpp5e develop a multiorgan disorder associated with structural defects of the primary cilium. In ciliated mouse embryonic fibroblasts, Inpp5e is concentrated in the axoneme of the primary cilium. Inpp5e inactivation did not impair ciliary assembly but altered the stability of pre-established cilia after serum addition. Blocking phosphoinositide 3-kinase (PI3K) activity or ciliary platelet-derived growth factor receptor alpha (PDGFRalpha) restored ciliary stability. In human INPP5E, we identified a mutation affecting INPP5E ciliary localization and cilium stability in a family with MORM syndrome, a condition related to Bardet-Biedl syndrome. Together, our results show that INPP5E plays an essential role in the primary cilium by controlling ciliary growth factor and PI3K signaling and stability, and highlight the consequences of INPP5E dysfunction.

• Authors: Monique Jacoby, James J Cox, Stéphanie Gayral, Daniel J Hampshire, Mohammed Ayub, Marianne Blockmans, Eileen Pernot, Marina V Kisseleva, Philippe Compère, Serge N Schiffmann, Fanni Gergely, John H Riley, David Pérez-Morga, C Geoffrey Woods, Stéphane Schurmans
• Journal: Nature genetics (Nat Genet) Vol. 41 Issue 9 Pg. 1027-31 (Sep 2009) ISSN: 1546-1718 [Electronic] United States
• PMID: 19668215 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Chromones
• Culture Media, Serum-Free
• Enzyme Inhibitors
• Fluorescent Dyes
• Genetic Markers
• Indoles
• Morpholines
• Phosphoinositide-3 Kinase Inhibitors
• Tubulin
• Green Fluorescent Proteins
• 2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one
• DAPI
• Receptor, Platelet-Derived Growth Factor alpha
• Phosphoric Monoester Hydrolases
• phosphoinositide 5-phosphatase

Topics

• Animals
• Bardet-Biedl Syndrome (genetics)
• Cell Line
• Cell Nucleus (metabolism)
• Cells, Cultured
• Chromones (pharmacology)
• Cilia (genetics, metabolism, pathology, ultrastructure)
• Culture Media, Serum-Free
• Embryo, Mammalian (cytology, metabolism)
• Enzyme Inhibitors (pharmacology)
• Fibroblasts (cytology, metabolism, ultrastructure)
• Fluorescent Antibody Technique, Direct
• Fluorescent Dyes (metabolism)
• Genetic Linkage
• Genetic Markers
• Green Fluorescent Proteins (metabolism)
• Humans
• Indoles (metabolism)
• Intellectual Disability (genetics)
• Male
• Mice
• Mice, Mutant Strains
• Mice, Transgenic
• Microsatellite Repeats
• Morpholines (pharmacology)
• Mutation
• Obesity (genetics)
• Penis (abnormalities)
• Phosphatidylinositol 3-Kinases (metabolism)
• Phosphoinositide-3 Kinase Inhibitors
• Phosphoric Monoester Hydrolases (genetics)
• Pigment Epithelium of Eye (cytology, metabolism)
• Polymorphism, Single Nucleotide
• Receptor, Platelet-Derived Growth Factor alpha (metabolism)
• Retinal Degeneration (genetics)
• Signal Transduction (physiology)
• Transfection
• Tubulin (metabolism)