title: Mutations in LIKE HETEROCHROMATIN PROTEIN 1 affect flowering time and plant architecture in Arabidopsis.
abstract: In plants, recent studies have demonstrated links between the regulation of developmental processes and chromatin dynamics and organisation. Analysis of new mutations affecting overall plant architecture, leaf development and flowering time in Arabidopsis has allowed us to clone and characterise LHP1, the Drosophila heterochromatin protein 1 (HP1) homologue. LHP1 has the chromo and chromo shadow domains central to the function of animal proteins. Yeast two hybrid studies and in planta deletion experiments suggest similar modes of action in plants and animals via homodimer formation. In vivo localisation experiments revealed a specific subnuclear protein distribution in foci throughout the nucleus. Our data suggest that LHP1 may act as a main regulator of gene expression in plants, through formation of heterochromatin-like repressive complexes, to control developmental pathways involved in organ and cell size, and the vegetative to reproductive phase transition.
authors.affiliation: Laboratoire de Biologie Cellulaire, INRA, route de St Cyr, 78026 Versailles cedex, France. valerie.gaudin@versailles.inra.fr
authors.forename: V
authors.initials: V
authors.lastname: Gaudin
authors.forename: M
authors.initials: M
authors.lastname: Libault
authors.forename: S
authors.initials: S
authors.lastname: Pouteau
authors.forename: T
authors.initials: T
authors.lastname: Juul
authors.forename: G
authors.initials: G
authors.lastname: Zhao
authors.forename: D
authors.initials: D
authors.lastname: Lefebvre
authors.forename: O
authors.initials: O
authors.lastname: Grandjean
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development*; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics*; D001483:Base Sequence; D002467:Cell Nucleus / Q000235:genetics; D000090266:Chromobox Protein Homolog 5; D002868:Chromosomal Proteins, Non-Histone / Q000737:chemistry / Q000235:genetics*; D003001:Cloning, Molecular; D017124:Conserved Sequence; D018076:DNA, Complementary / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D019281:Dimerization; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D008969:Molecular Sequence Data; D009154:Mutation; D018515:Plant Leaves / Q000254:growth & development; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid
chemical_list: D029681:Arabidopsis Proteins; D002868:Chromosomal Proteins, Non-Histone; D018076:DNA, Complementary; D018744:DNA, Plant; C443901:like heterochromatin protein 1; D000090266:Chromobox Protein Homolog 5