title: Centriole amplification by mother and daughter centrioles differs in multiciliated cells.
abstract: The semi-conservative centrosome duplication in cycling cells gives rise to a centrosome composed of a mother and a newly formed daughter centriole. Both centrioles are regarded as equivalent in their ability to form new centrioles and their symmetric duplication is crucial for cell division homeostasis. Multiciliated cells do not use the archetypal duplication program and instead form more than a hundred centrioles that are required for the growth of motile cilia and the efficient propelling of physiological fluids. The majority of these new centrioles are thought to appear de novo, that is, independently from the centrosome, around electron-dense structures called deuterosomes. Their origin remains unknown. Using live imaging combined with correlative super-resolution light and electron microscopy, we show that all new centrioles derive from the pre-existing progenitor cell centrosome through multiple rounds of procentriole seeding. Moreover, we establish that only the daughter centrosomal centriole contributes to deuterosome formation, and thus to over ninety per cent of the final centriole population. This unexpected centriolar asymmetry grants new perspectives when studying cilia-related diseases and pathological centriole amplification observed in cycling cells and associated with microcephaly and cancer.
authors.affiliation: 1] Ecole Normale Supérieure, Institut de Biologie de l'ENS, IBENS, F-75005 Paris, France [2] Inserm, U1024, F-75005 Paris, France [3] CNRS, UMR 8197, F-75005 Paris, France.
authors.forename: Adel
authors.initials: A
authors.lastname: Al Jord
authors.affiliation: 1] Ecole Normale Supérieure, Institut de Biologie de l'ENS, IBENS, F-75005 Paris, France [2] Inserm, U1024, F-75005 Paris, France [3] CNRS, UMR 8197, F-75005 Paris, France.
authors.forename: Anne-Iris
authors.initials: AI
authors.lastname: Lemaître
authors.affiliation: 1] Ecole Normale Supérieure, Institut de Biologie de l'ENS, IBENS, F-75005 Paris, France [2] Inserm, U1024, F-75005 Paris, France [3] CNRS, UMR 8197, F-75005 Paris, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Delgehyr
authors.affiliation: 1] Ecole Normale Supérieure, Institut de Biologie de l'ENS, IBENS, F-75005 Paris, France [2] Inserm, U1024, F-75005 Paris, France [3] CNRS, UMR 8197, F-75005 Paris, France.
authors.forename: Marion
authors.initials: M
authors.lastname: Faucourt
authors.affiliation: 1] Ecole Normale Supérieure, Institut de Biologie de l'ENS, IBENS, F-75005 Paris, France [2] Inserm, U1024, F-75005 Paris, France [3] CNRS, UMR 8197, F-75005 Paris, France [4].
authors.forename: Nathalie
authors.initials: N
authors.lastname: Spassky
authors.affiliation: 1] Ecole Normale Supérieure, Institut de Biologie de l'ENS, IBENS, F-75005 Paris, France [2] Inserm, U1024, F-75005 Paris, France [3] CNRS, UMR 8197, F-75005 Paris, France [4].
authors.forename: Alice
authors.initials: A
authors.lastname: Meunier
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002502:Centrioles / Q000502:physiology* / Q000648:ultrastructure; D018385:Centrosome / Q000502:physiology* / Q000648:ultrastructure; D002923:Cilia / Q000502:physiology* / Q000648:ultrastructure; D051379:Mice; D046529:Microscopy, Electron, Transmission