title: A Common histone modification code on C4 genes in maize and its conservation in Sorghum and Setaria italica.
abstract: C4 photosynthesis evolved more than 60 times independently in different plant lineages. Each time, multiple genes were recruited into C4 metabolism. The corresponding promoters acquired new regulatory features such as high expression, light induction, or cell type-specific expression in mesophyll or bundle sheath cells. We have previously shown that histone modifications contribute to the regulation of the model C4 phosphoenolpyruvate carboxylase (C4-Pepc) promoter in maize (Zea mays). We here tested the light- and cell type-specific responses of three selected histone acetylations and two histone methylations on five additional C4 genes (C4-Ca, C4-Ppdk, C4-Me, C4-Pepck, and C4-RbcS2) in maize. Histone acetylation and nucleosome occupancy assays indicated extended promoter regions with regulatory upstream regions more than 1,000 bp from the transcription initiation site for most of these genes. Despite any detectable homology of the promoters on the primary sequence level, histone modification patterns were highly coregulated. Specifically, H3K9ac was regulated by illumination, whereas H3K4me3 was regulated in a cell type-specific manner. We further compared histone modifications on the C4-Pepc and C4-Me genes from maize and the homologous genes from sorghum (Sorghum bicolor) and Setaria italica. Whereas sorghum and maize share a common C4 origin, C4 metabolism evolved independently in S. italica. The distribution of histone modifications over the promoters differed between the species, but differential regulation of light-induced histone acetylation and cell type-specific histone methylation were evident in all three species. We propose that a preexisting histone code was recruited into C4 promoter control during the evolution of C4 metabolism.
authors.affiliation: Leibniz University Hannover, Institute of Botany, 30419 Hannover, Germany.
authors.forename: Louisa
authors.initials: L
authors.lastname: Heimann
authors.forename: Ina
authors.initials: I
authors.lastname: Horst
authors.forename: Renke
authors.initials: R
authors.lastname: Perduns
authors.forename: Björn
authors.initials: B
authors.lastname: Dreesen
authors.forename: Sascha
authors.initials: S
authors.lastname: Offermann
authors.forename: Christoph
authors.initials: C
authors.lastname: Peterhansel
mesh_terms: D000107:Acetylation; D018506:Gene Expression Regulation, Plant; D042421:Histone Code; D006657:Histones / Q000235:genetics / Q000378:metabolism*; D008027:Light; D008745:Methylation; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics; D032983:Setaria Plant / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects; D045868:Sorghum / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects; D013045:Species Specificity; D003313:Zea mays / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects
chemical_list: D006657:Histones; D010940:Plant Proteins
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