Genome-wide maps of mononucleosomes and dinucleosomes containing hyperacetylated histones of Aspergillus fumigatus

• Published in: PloS one Vol. 5; no. 3; p. e9916
• Main Authors: Nishida, Hiromi, Motoyama, Takayuki, Suzuki, Yutaka, Yamamoto, Shogo, Aburatani, Hiroyuki, Osada, Hiroyuki
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 26.03.2010; Public Library of Science (PLoS)
• Subjects: Acetylation; Algorithms; Aspergillus fumigatus; Aspergillus fumigatus - genetics; Aspergillus fumigatus - metabolism; Aspergillus nidulans; Bioinformatics; Chromatin; Chromatin - metabolism; Density; Deoxyribonucleic acid; DNA; DNA - metabolism; DNA binding proteins; Elongation; Expressed Sequence Tags; Fragmentation; Fragments; Fungi; Gene expression; Gene mapping; Genes; Genetic Techniques; Genetics and Genomics/Bioinformatics; Genetics and Genomics/Chromosome Biology; Genetics and Genomics/Epigenetics; Genetics and Genomics/Gene Expression; Genomes; Genomics; Histone deacetylase; Histones; Histones - chemistry; Histones - metabolism; Microbiology; Nuclease; Nucleosomes; Nucleosomes - genetics; Nucleosomes - metabolism; Nucleotide sequence; Oligonucleotide Array Sequence Analysis; Open access; Promoter Regions, Genetic; Promoters; Proteins; Saccharomyces cerevisiae; Science; Studies; Time Factors; Transcription, Genetic; Trichostatin A
• DOI: 10.1371/journal.pone.0009916
• ISSN: 1932-6203

It is suggested that histone modifications and/or histone variants influence the nucleosomal DNA length. We sequenced both ends of mononucleosomal and dinucleosomal DNA fragments of the filamentous fungus Aspergillus fumigatus, after treatment with the histone deacetylase inhibitor trichostatin A (TSA). After mapping the DNA fragments to the genome, we identified >7 million mononucleosome positions and >7 million dinucleosome positions. We showed that the distributions of the lengths of the mononucleosomal DNA fragments after 15-min and 30-min treatments with micrococcal nuclease (MNase) showed a single peak at 168 nt and 160 nt, respectively. The distributions of the lengths of the dinucleosomal DNA fragments after 15-min- and 30-min-treatment with MNase showed a single peak at 321 nt and 306 nt, respectively. The nucleosomal DNA fragments obtained from the TSA-treated cells were significantly longer than those obtained from the untreated cells. On the other hand, most of the genes did not undergo any change after treatment. Between the TSA-treated and untreated cells, only 77 genes had >or=2-fold change in expression levels. In addition, our results showed that the locations where mononucleosomes were frequently detected were conserved between the TSA-treated cells and untreated cells in the gene promoters (lower density of the nucleosomes). However, these locations were less conserved in the bodies (higher density of the nucleosomes) of genes with >or=2-fold changes. Our findings indicate that TSA influences the nucleosome positions, especially of the regions with high density of the nucleosomes by elongation of the nucleosomal DNA. However, most of the nucleosome positions are conserved in the gene promoters, even after treatment with TSA, because of the low density of nucleosomes in the gene promoters.