title: Histone H3 lysine 4 trimethylation marks meiotic recombination initiation sites.
abstract: The function of histone modifications in initiating and regulating the chromosomal events of the meiotic prophase remains poorly understood. In Saccharomyces cerevisiae, we examined the genome-wide localization of histone H3 lysine 4 trimethylation (H3K4me3) along meiosis and its relationship to gene expression and position of the programmed double-strand breaks (DSBs) that initiate interhomologue recombination, essential to yield viable haploid gametes. We find that the level of H3K4me3 is constitutively higher close to DSB sites, independently of local gene expression levels. Without Set1, the H3K4 methylase, 84% of the DSB sites exhibit a severely reduced DSB frequency, the reduction being quantitatively correlated with the local level of H3K4me3 in wild-type cells. Further, we show that this differential histone mark is already established in vegetative cells, being higher in DSB-prone regions than in regions with no or little DSB. Taken together, our results demonstrate that H3K4me3 is a prominent and preexisting mark of active meiotic recombination initiation sites. Novel perspectives to dissect the various layers of the controls of meiotic DSB formation are discussed.
authors.affiliation: Institut Curie Centre de Recherche, UMR7147 CNRS, Université Pierre et Marie Curie, Paris, France.
authors.forename: Valérie
authors.initials: V
authors.lastname: Borde
authors.forename: Nicolas
authors.initials: N
authors.lastname: Robine
authors.forename: Waka
authors.initials: W
authors.lastname: Lin
authors.forename: Sandrine
authors.initials: S
authors.lastname: Bonfils
authors.forename: Vincent
authors.initials: V
authors.lastname: Géli
authors.forename: Alain
authors.initials: A
authors.lastname: Nicolas
mesh_terms: D053903:DNA Breaks, Double-Stranded; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology; D015966:Gene Expression Regulation, Fungal; D011495:Histone-Lysine N-Methyltransferase; D006657:Histones / Q000378:metabolism*; D008239:Lysine / Q000378:metabolism; D008540:Meiosis / Q000502:physiology*; D008745:Methylation; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000502:physiology; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology
chemical_list: D004268:DNA-Binding Proteins; D006657:Histones; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D011495:Histone-Lysine N-Methyltransferase; C411250:SET1 protein, S cerevisiae; D008239:Lysine