title: Codependency of H2B monoubiquitination and nucleosome reassembly on Chd1.
abstract: Monoubiquitination of histone H2B on Lys 123 (H2BK123ub) is a transient histone modification considered to be essential for establishing H3K4 and H3K79 trimethylation by Set1/COMPASS and Dot1, respectively. Here, we identified Chd1 as a factor that is required for the maintenance of high levels of H2B monoubiquitination, but not for H3K4 and H3K79 trimethylation. Loss of Chd1 results in a substantial loss of H2BK123ub levels with little to no effect on the genome-wide pattern of H3K4 and H3K79 trimethylation. Our data show that nucleosomal occupancy is reduced in gene bodies in both chd1Δ and, as has been shown, K123A mutant backgrounds. We also demonstrated that Chd1's function in maintaining H2BK123ub levels is conserved from yeast to humans. Our study provides evidence that only small levels of H2BK123ub are necessary for full levels of H3K4 and H3K79 trimethylation in vivo and points to a possible role for Chd1 in positively regulating gene expression through promoting nucleosome reassembly coupled with H2B monoubiquitination.
authors.affiliation: Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA.
authors.forename: Jung-Shin
authors.initials: JS
authors.lastname: Lee
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Garrett
authors.forename: Kuangyu
authors.initials: K
authors.lastname: Yen
authors.forename: Yoh-Hei
authors.initials: YH
authors.lastname: Takahashi
authors.forename: Deqing
authors.initials: D
authors.lastname: Hu
authors.forename: Jessica
authors.initials: J
authors.lastname: Jackson
authors.forename: Christopher
authors.initials: C
authors.lastname: Seidel
authors.forename: B Franklin
authors.initials: BF
authors.lastname: Pugh
authors.forename: Ali
authors.initials: A
authors.lastname: Shilatifard
mesh_terms: D064200:Cdh1 Proteins; D018507:Gene Expression Regulation, Developmental; D015966:Gene Expression Regulation, Fungal; D055106:Genome-Wide Association Study; D006657:Histones / Q000378:metabolism*; D009707:Nucleosomes / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000254:growth & development* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D054875:Ubiquitination
chemical_list: D064200:Cdh1 Proteins; D006657:Histones; D009707:Nucleosomes; D029701:Saccharomyces cerevisiae Proteins