RRC ID 4316
Author Whittle CM, McClinic KN, Ercan S, Zhang X, Green RD, Kelly WG, Lieb JD.
Title The genomic distribution and function of histone variant HTZ-1 during C. elegans embryogenesis.
Journal PLoS Genet.
Abstract In all eukaryotes, histone variants are incorporated into a subset of nucleosomes to create functionally specialized regions of chromatin. One such variant, H2A.Z, replaces histone H2A and is required for development and viability in all animals tested to date. However, the function of H2A.Z in development remains unclear. Here, we use ChIP-chip, genetic mutation, RNAi, and immunofluorescence microscopy to interrogate the function of H2A.Z (HTZ-1) during embryogenesis in Caenorhabditis elegans, a key model of metazoan development. We find that HTZ-1 is expressed in every cell of the developing embryo and is essential for normal development. The sites of HTZ-1 incorporation during embryogenesis reveal a genome wrought by developmental processes. HTZ-1 is incorporated upstream of 23% of C. elegans genes. While these genes tend to be required for development and occupied by RNA polymerase II, HTZ-1 incorporation does not specify a stereotypic transcription program. The data also provide evidence for unexpectedly widespread independent regulation of genes within operons during development; in 37% of operons, HTZ-1 is incorporated upstream of internally encoded genes. Fewer sites of HTZ-1 incorporation occur on the X chromosome relative to autosomes, which our data suggest is due to a paucity of developmentally important genes on X, rather than a direct function for HTZ-1 in dosage compensation. Our experiments indicate that HTZ-1 functions in establishing or maintaining an essential chromatin state at promoters regulated dynamically during C. elegans embryogenesis.
Volume 4(9)
Pages e1000187
Published 2008-9-12
DOI 10.1371/journal.pgen.1000187
PMID 18787694
PMC PMC2522285
MeSH Animals Caenorhabditis elegans / embryology* Caenorhabditis elegans / genetics* Caenorhabditis elegans / growth & development Caenorhabditis elegans Proteins / genetics* Caenorhabditis elegans Proteins / metabolism Dosage Compensation, Genetic Embryonic Development / genetics Female Fluorescent Antibody Technique Genome, Helminth* Histones / genetics* Histones / metabolism Models, Genetic Operon / genetics Promoter Regions, Genetic RNA Interference RNA Polymerase II / metabolism Transcription Initiation Site X Chromosome / metabolism
IF 5.54
Times Cited 67
WOS Category GENETICS & HEREDITY
Resource
C.elegans tm2469