title: An analysis and prediction of nucleosome positioning based on information content.
abstract: Nucleosome positioning plays a key role in the regulation of many biological processes. In this study, the statistical difference of information content was investigated in nucleosome and linker DNA regions across eukaryotic organisms. By analyzing the information redundancy, D k , in Saccharomyces cerevisiae, Drosophila melanogaster, and Caenorhabditis elegans genomes, the short-range dominance of nucleotide correlation in nucleosome and linker DNA regions was confirmed. Significant difference of the D k value between the nucleosome and linker DNA regions was also found. The underlying reason for many successful oligonucleotide-based predictions of nucleosome positioning in eukaryotic model organisms may be attributed to the short-range dominance of nucleotide correlation in the nucleosome and linker DNA regions. When applying power spectrum analysis to the nucleosome and linker DNA regions, some obvious differences in sequence periodic signals were observed. The parameter F k was introduced to describe particular base correlation. Furthermore, the support vector machine combining F k was used to classify nucleosome and linker DNA regions in Homo sapiens, Oryzias latipes, C. elegans, Candida albicans, and S. cerevisiae. Independent test demonstrated that a good performance can be achieved by using this algorithm. This result further revealed that base correlation information has an important role in nucleosome positioning.
authors: School of Physical Science and Technology, Inner Mongolia University, Hohhot, 010021, China.
authors: Yong-qiang
authors: YQ
authors: Xing
authors: Guo-qing
authors: GQ
authors: Liu
authors: Xiu-juan
authors: XJ
authors: Zhao
authors: Lu
authors: L
authors: Cai
mesh_terms: D000465:Algorithms; D000818:Animals; D017173:Caenorhabditis elegans / Q000235:genetics*; D042002:Chromatin Assembly and Disassembly / Q000235:genetics; D019295:Computational Biology; D004247:DNA / Q000235:genetics; D004331:Drosophila melanogaster / Q000235:genetics*; D006801:Humans; D009707:Nucleosomes / Q000737:chemistry / Q000235:genetics*; D009711:Nucleotides / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000235:genetics*
chemical_list: D009707:Nucleosomes; D009711:Nucleotides; D004247:DNA