title: DOMINO1, a member of a small plant-specific gene family, encodes a protein essential for nuclear and nucleolar functions.
abstract: Arabidopsis embryos carrying the domino1 mutation grow slowly in comparison with wild type embryos and as a consequence reach only the globular stage at desiccation. The primary defect of the mutation at the cellular level is the large size of the nucleolus that can be observed soon after fertilization in the nuclei of both the embryo and the endosperm. The ultrastructure of mutant nucleoli is drastically different from wild type and points to a fault in ribosome biogenesis. DOMINO1 encodes a protein, which belongs to a plant-specific gene family sharing a common motif of unknown function, present in the tomato DEFECTIVE CHLOROPLASTS AND LEAVES (LeDCL) protein. Using a GFP protein fusion, we show that DOMINO1 is targeted to the nucleus. We propose that inactivation of DOMINO1 has a negative effect on ribosome biogenesis and on the rate of cell division.
authors.affiliation: Laboratoire Génome et Développement des Plantes, CNRS-UMR 5096, Université de Perpignan, 52 Avenue de Villeneuve, 66860 Perpignan-cedex, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Lahmy
authors.forename: Jocelyne
authors.initials: J
authors.lastname: Guilleminot
authors.forename: Ching-Ming
authors.initials: CM
authors.lastname: Cheng
authors.forename: Nicole
authors.initials: N
authors.lastname: Bechtold
authors.forename: Sylvie
authors.initials: S
authors.lastname: Albert
authors.forename: Georges
authors.initials: G
authors.lastname: Pelletier
authors.forename: Michel
authors.initials: M
authors.lastname: Delseny
authors.forename: Martine
authors.initials: M
authors.lastname: Devic
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics / Q000502:physiology; D002466:Cell Nucleolus / Q000502:physiology*; D002467:Cell Nucleus / Q000502:physiology*; D017124:Conserved Sequence; D005306:Fertilization; D008969:Molecular Sequence Data; D005810:Multigene Family; D010940:Plant Proteins / Q000235:genetics*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D010940:Plant Proteins